Utilizzo di INotifyPropertyChanged con Entity Framework 6 DbContext Generator

Question

So che posso utilizzare ObjectContext, ma mi piacciono le funzionalità di DbContext/DbSet. La mia applicazione non è abbastanza grande da giustificare la scrittura di modelli di visualizzazione complessi, quindi vorrei implementare la notifica delle modifiche direttamente sui modelli generati da EF.

Come posso ottenere questo risultato?

Answer 1

Ciò può essere ottenuto sostituendo il modello T4 predefinito (il file .tt aggiunto automaticamente da Entity Framework) con quanto segue, quindi facendo clic con il pulsante destro sul file .tt e selezionando "Esegui strumento personalizzato".

Importante: questo rigenererà i tuoi modelli che faranno scartare eventuali personalizzazioni. Vi consiglio di implementare le personalizzazioni tramite il modello piuttosto che modificare direttamente la classe del modello per evitare che ciò possa costituire un problema in futuro.

Nota: sostituire string inputFile = @"MessageLog.edmx"; con il nome del file edmx.

<#@ template language="C#" debug="false" hostspecific="true"#> 
<#@ include file="EF.Utility.CS.ttinclude"#><#@ 
output extension=".cs"#><# 

CodeGenerationTools code = new CodeGenerationTools(this); 
MetadataLoader loader = new MetadataLoader(this); 
CodeRegion region = new CodeRegion(this, 1); 
MetadataTools ef = new MetadataTools(this); 

string inputFile = @"MessageLog.edmx"; 
EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile); 
string namespaceName = code.VsNamespaceSuggestion(); 

EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this); 
WriteHeader(fileManager); 

foreach (var entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name)) 
{ 
    fileManager.StartNewFile(entity.Name + ".cs"); 
    BeginNamespace(namespaceName, code); 
#> 
using System; 
using System.Collections.Generic; 
using System.ComponentModel; 

<#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#> : INotifyPropertyChanged<#=code.StringBefore(", ", code.Escape(entity.BaseType))#> 
{ 
<# 
    var propertiesWithDefaultValues = entity.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == entity && p.DefaultValue != null); 
    var collectionNavigationProperties = entity.NavigationProperties.Where(np => np.DeclaringType == entity && np.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many); 
    var complexProperties = entity.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == entity); 

    if (propertiesWithDefaultValues.Any() || collectionNavigationProperties.Any() || complexProperties.Any()) 
    { 
#> 
    public <#=code.Escape(entity)#>() 
    { 
<# 
     foreach (var edmProperty in propertiesWithDefaultValues) 
     { 
#> 
     this.<#=code.Escape(edmProperty)#> = <#=code.CreateLiteral(edmProperty.DefaultValue)#>; 
<# 
     } 

     foreach (var navigationProperty in collectionNavigationProperties) 
     { 
#> 
     this.<#=code.Escape(navigationProperty)#> = new ObservableListSource<<#=code.Escape(navigationProperty.ToEndMember.GetEntityType())#>>(); 
<# 
     } 

     foreach (var complexProperty in complexProperties) 
     { 
#> 
     this.<#=code.Escape(complexProperty)#> = new <#=code.Escape(complexProperty.TypeUsage)#>(); 
<# 
     } 
#> 
    } 

<# 
    } 

    var primitiveProperties = entity.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == entity); 
    if (primitiveProperties.Any()) 
    { 
     foreach (var edmProperty in primitiveProperties) 
     { 
      WriteProperty(code, edmProperty); 
     } 
    } 

    if (complexProperties.Any()) 
    { 
#> 

<# 
     foreach(var complexProperty in complexProperties) 
     { 
      WriteProperty(code, complexProperty); 
     } 
    } 

    var navigationProperties = entity.NavigationProperties.Where(np => np.DeclaringType == entity); 
    if (navigationProperties.Any()) 
    { 
#> 

<# 
     foreach (var navigationProperty in navigationProperties) 
     { 
      WriteNavigationProperty(code, navigationProperty); 
     } 
    } 
#> 

    #region INotifyPropertyChanged Members 
    public event PropertyChangedEventHandler PropertyChanged; 

    protected void OnPropertyChanged(string propertyName) 
    { 
     OnPropertyChanged(new PropertyChangedEventArgs(propertyName)); 
    } 

    protected virtual void OnPropertyChanged(PropertyChangedEventArgs e) 
    { 
     if (PropertyChanged != null) 
      PropertyChanged(this, e); 
    } 
    #endregion 
} 
<# 
    EndNamespace(namespaceName); 
} 

foreach (var complex in ItemCollection.GetItems<ComplexType>().OrderBy(e => e.Name)) 
{ 
    fileManager.StartNewFile(complex.Name + ".cs"); 
    BeginNamespace(namespaceName, code); 
#> 
using System; 

<#=Accessibility.ForType(complex)#> partial class <#=code.Escape(complex)#> 
{ 
<# 
    var complexProperties = complex.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == complex); 
    var propertiesWithDefaultValues = complex.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == complex && p.DefaultValue != null); 

    if (propertiesWithDefaultValues.Any() || complexProperties.Any()) 
    { 
#> 
    public <#=code.Escape(complex)#>() 
    { 
<# 
     foreach (var edmProperty in propertiesWithDefaultValues) 
     { 
#> 
     this.<#=code.Escape(edmProperty)#> = <#=code.CreateLiteral(edmProperty.DefaultValue)#>; 
<# 
     } 

     foreach (var complexProperty in complexProperties) 
     { 
#> 
     this.<#=code.Escape(complexProperty)#> = new <#=code.Escape(complexProperty.TypeUsage)#>(); 
<# 
     } 
#> 
    } 

<# 
    } 

    var primitiveProperties = complex.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == complex); 
    if (primitiveProperties.Any()) 
    { 
     foreach(var edmProperty in primitiveProperties) 
     { 
      WriteProperty(code, edmProperty); 
     } 
    } 

    if (complexProperties.Any()) 
    { 
#> 

<# 
     foreach(var edmProperty in complexProperties) 
     { 
      WriteProperty(code, edmProperty); 
     } 
    } 
#> 
} 
<# 
    EndNamespace(namespaceName); 
} 

if (!VerifyTypesAreCaseInsensitiveUnique(ItemCollection)) 
{ 
    return ""; 
} 

fileManager.Process(); 

#> 
<#+ 
string GetResourceString(string resourceName) 
{ 
    if(_resourceManager == null) 
    { 
     _resourceManager = new System.Resources.ResourceManager("System.Data.Entity.Design", typeof(System.Data.Entity.Design.MetadataItemCollectionFactory).Assembly); 
    } 

    return _resourceManager.GetString(resourceName, null); 
} 
System.Resources.ResourceManager _resourceManager; 

void WriteHeader(EntityFrameworkTemplateFileManager fileManager) 
{ 
    fileManager.StartHeader(); 
#> 
//------------------------------------------------------------------------------ 
// <auto-generated> 
// <#=GetResourceString("Template_GeneratedCodeCommentLine1")#> 
// 
// <#=GetResourceString("Template_GeneratedCodeCommentLine2")#> 
// <#=GetResourceString("Template_GeneratedCodeCommentLine3")#> 
// </auto-generated> 
//------------------------------------------------------------------------------ 

<#+ 
    fileManager.EndBlock(); 
} 

void BeginNamespace(string namespaceName, CodeGenerationTools code) 
{ 
    CodeRegion region = new CodeRegion(this); 
    if (!String.IsNullOrEmpty(namespaceName)) 
    { 
#> 
namespace <#=code.EscapeNamespace(namespaceName)#> 
{ 
<#+ 
     PushIndent(CodeRegion.GetIndent(1)); 
    } 
} 


void EndNamespace(string namespaceName) 
{ 
    if (!String.IsNullOrEmpty(namespaceName)) 
    { 
     PopIndent(); 
#> 
} 
<#+ 
    } 
} 

void WriteProperty(CodeGenerationTools code, EdmProperty edmProperty) 
{ 
    WriteProperty(Accessibility.ForProperty(edmProperty), 
        code.Escape(edmProperty.TypeUsage), 
        code.Escape(edmProperty), 
        code.SpaceAfter(Accessibility.ForGetter(edmProperty)), 
        code.SpaceAfter(Accessibility.ForSetter(edmProperty))); 
} 

void WriteNavigationProperty(CodeGenerationTools code, NavigationProperty navigationProperty) 
{ 
    var endType = code.Escape(navigationProperty.ToEndMember.GetEntityType()); 
    WriteProperty(PropertyVirtualModifier(Accessibility.ForProperty(navigationProperty)), 
        navigationProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ObservableListSource<" + endType + ">") : endType, 
        code.Escape(navigationProperty), 
        code.SpaceAfter(Accessibility.ForGetter(navigationProperty)), 
        code.SpaceAfter(Accessibility.ForSetter(navigationProperty))); 
} 

void WriteProperty(string accessibility, string type, string name, string getterAccessibility, string setterAccessibility) 
{ 
#> 
    private <#=type#> _<#=name#>; 
    public <#=type#> <#=name#> 
    { 
     <#=getterAccessibility#>get { return _<#=name#>; } 
     <#=setterAccessibility#>set 
     { 
      if (_<#=name#> != value) 
      { 
       _<#=name#> = value; 
       OnPropertyChanged("<#=name#>"); 
      } 
     } 
    } 
<#+ 
} 

string PropertyVirtualModifier(string accessibility) 
{ 
    return accessibility + (accessibility != "private" ? " virtual" : ""); 
} 

bool VerifyTypesAreCaseInsensitiveUnique(EdmItemCollection itemCollection) 
{ 
    var alreadySeen = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase); 
    foreach(var type in itemCollection.GetItems<StructuralType>()) 
    { 
     if (!(type is EntityType || type is ComplexType)) 
     { 
      continue; 
     } 

     if (alreadySeen.ContainsKey(type.FullName)) 
     { 
      Error(String.Format(CultureInfo.CurrentCulture, "This template does not support types that differ only by case, the types {0} are not supported", type.FullName)); 
      return false; 
     } 
     else 
     { 
      alreadySeen.Add(type.FullName, true); 
     } 
    } 

    return true; 
} 
#> 

Answer 2

Ho avuto un grande successo utilizzando un pacchetto di NuGet chiamato PropertyChanged.Fody per ottenere INPC implementata sulle classi di entità. Basta installare il pacchetto, quindi aggiungere l'attributo [ImplementPropertyChanged] a qualsiasi classe e PropertyChanged.Fody "inserisce" INPC nella classe come parte del processo di generazione. Ad esempio, se hai una classe entità generata chiamata Cliente, aggiungi il seguente codice da qualche parte nel tuo progetto.

using PropertyChanged; 

[ImplementPropertyChanged] 
public partial class Customer 
{ 
} 

Non ci sono altri attributi che è possibile utilizzare per controllare il comportamento del pacchetto PropertyChanged. Vedi https://github.com/Fody/PropertyChanged per i dettagli.

Answer 3

Peronally mi hanno alcuni problemi con l'implementazione di Fody forse questo post potrebbe aiutare a T4 Personalization

NOTA: Funziona con EF 6.1 a.

Answer 4

Ho anche avuto problemi. Ecco la mia implementazione che funziona con 6.1.2. Chiaramente il problema con questa soluzione è che ogni modifica in EF richiederà un nuovo script tt. Forse Microsoft potrebbe fornire diverse opzioni che forniscono diversi livelli di supporto.

<#@ template language="C#" debug="false" hostspecific="true"#> 
<#@ include file="EF6.Utility.CS.ttinclude"#><#@ 
output extension=".cs"#><# 

const string inputFile = @"Model.edmx"; 
var textTransform = DynamicTextTransformation.Create(this); 
var code = new CodeGenerationTools(this); 
var ef = new MetadataTools(this); 
var typeMapper = new TypeMapper(code, ef, textTransform.Errors); 
var fileManager = EntityFrameworkTemplateFileManager.Create(this); 
var itemCollection = new EdmMetadataLoader(textTransform.Host, textTransform.Errors).CreateEdmItemCollection(inputFile); 
var codeStringGenerator = new CodeStringGenerator(code, typeMapper, ef); 

if (!typeMapper.VerifyCaseInsensitiveTypeUniqueness(typeMapper.GetAllGlobalItems(itemCollection), inputFile)) 
{ 
    return string.Empty; 
} 

WriteHeader(codeStringGenerator, fileManager); 

foreach (var entity in typeMapper.GetItemsToGenerate<EntityType>(itemCollection)) 
{ 
    fileManager.StartNewFile(entity.Name + ".cs"); 
    BeginNamespace(code); 
#> 
<#=codeStringGenerator.UsingDirectives(inHeader: false)#> 
<#=codeStringGenerator.EntityClassOpening(entity)#> 
{ 
<# 
    var propertiesWithDefaultValues = typeMapper.GetPropertiesWithDefaultValues(entity); 
    var collectionNavigationProperties = typeMapper.GetCollectionNavigationProperties(entity); 
    var complexProperties = typeMapper.GetComplexProperties(entity); 

    if (propertiesWithDefaultValues.Any() || collectionNavigationProperties.Any() || complexProperties.Any()) 
    { 
#> 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")] 
    public <#=code.Escape(entity)#>() 
    { 
<# 
     foreach (var edmProperty in propertiesWithDefaultValues) 
     { 
#> 
     this.<#=code.Escape(edmProperty)#> = <#=typeMapper.CreateLiteral(edmProperty.DefaultValue)#>; 
<# 
     } 

     foreach (var navigationProperty in collectionNavigationProperties) 
     { 
#> 
     this.<#=code.Escape(navigationProperty)#> = new HashSet<<#=typeMapper.GetTypeName(navigationProperty.ToEndMember.GetEntityType())#>>(); 
<# 
     } 

     foreach (var complexProperty in complexProperties) 
     { 
#> 
     this.<#=code.Escape(complexProperty)#> = new <#=typeMapper.GetTypeName(complexProperty.TypeUsage)#>(); 
<# 
     } 
#> 
    } 

<# 
    } 

    var simpleProperties = typeMapper.GetSimpleProperties(entity); 
    if (simpleProperties.Any()) 
    { 
     foreach (var edmProperty in simpleProperties) 
     { 
#> 
    <#=codeStringGenerator.Property(edmProperty)#> 
<# 
     } 
    } 

    if (complexProperties.Any()) 
    { 
#> 

<# 
     foreach(var complexProperty in complexProperties) 
     { 
#> 
    <#=codeStringGenerator.Property(complexProperty)#> 
<# 
     } 
    } 

    var navigationProperties = typeMapper.GetNavigationProperties(entity); 
    if (navigationProperties.Any()) 
    { 
#> 

<# 
     foreach (var navigationProperty in navigationProperties) 
     { 
      if (navigationProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many) 
      { 
#> 
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")] 
<# 
      } 
#> 
    <#=codeStringGenerator.NavigationProperty(navigationProperty)#> 
<# 
     } 
    } 
#> 

    #region INotifyPropertyChanged Members 
    public event PropertyChangedEventHandler PropertyChanged; 

    protected void OnPropertyChanged(string propertyName) 
    { 
     OnPropertyChanged(new PropertyChangedEventArgs(propertyName)); 
    } 

    protected virtual void OnPropertyChanged(PropertyChangedEventArgs e) 
    { 
     if (PropertyChanged != null) 
     { 
      WhenPropertyChanged(e); 
      PropertyChanged(this, e); 
     } 
    } 

    partial void WhenPropertyChanged(PropertyChangedEventArgs e); 
    #endregion 
} 
<# 
    EndNamespace(code); 
} 

foreach (var complex in typeMapper.GetItemsToGenerate<ComplexType>(itemCollection)) 
{ 
    fileManager.StartNewFile(complex.Name + ".cs"); 
    BeginNamespace(code); 
#> 
<#=codeStringGenerator.UsingDirectives(inHeader: false, includeCollections: false)#> 
<#=Accessibility.ForType(complex)#> partial class <#=code.Escape(complex)#> 
{ 
<# 
    var complexProperties = typeMapper.GetComplexProperties(complex); 
    var propertiesWithDefaultValues = typeMapper.GetPropertiesWithDefaultValues(complex); 

    if (propertiesWithDefaultValues.Any() || complexProperties.Any()) 
    { 
#> 
    public <#=code.Escape(complex)#>() 
    { 
<# 
     foreach (var edmProperty in propertiesWithDefaultValues) 
     { 
#> 
     this.<#=code.Escape(edmProperty)#> = <#=typeMapper.CreateLiteral(edmProperty.DefaultValue)#>; 
<# 
     } 

     foreach (var complexProperty in complexProperties) 
     { 
#> 
     this.<#=code.Escape(complexProperty)#> = new <#=typeMapper.GetTypeName(complexProperty.TypeUsage)#>(); 
<# 
     } 
#> 
    } 

<# 
    } 

    var simpleProperties = typeMapper.GetSimpleProperties(complex); 
    if (simpleProperties.Any()) 
    { 
     foreach(var edmProperty in simpleProperties) 
     { 
#> 
    <#=codeStringGenerator.Property(edmProperty)#> 
<# 
     } 
    } 

    if (complexProperties.Any()) 
    { 
#> 

<# 
     foreach(var edmProperty in complexProperties) 
     { 
#> 
    <#=codeStringGenerator.Property(edmProperty)#> 
<# 
     } 
    } 
#> 
} 
<# 
    EndNamespace(code); 
} 

foreach (var enumType in typeMapper.GetEnumItemsToGenerate(itemCollection)) 
{ 
    fileManager.StartNewFile(enumType.Name + ".cs"); 
    BeginNamespace(code); 
#> 
<#=codeStringGenerator.UsingDirectives(inHeader: false, includeCollections: false)#> 
<# 
    if (typeMapper.EnumIsFlags(enumType)) 
    { 
#> 
[Flags] 
<# 
    } 
#> 
<#=codeStringGenerator.EnumOpening(enumType)#> 
{ 
<# 
    var foundOne = false; 

    foreach (MetadataItem member in typeMapper.GetEnumMembers(enumType)) 
    { 
     foundOne = true; 
#> 
    <#=code.Escape(typeMapper.GetEnumMemberName(member))#> = <#=typeMapper.GetEnumMemberValue(member)#>, 
<# 
    } 

    if (foundOne) 
    { 
     this.GenerationEnvironment.Remove(this.GenerationEnvironment.Length - 3, 1); 
    } 
#> 
} 
<# 
    EndNamespace(code); 
} 

fileManager.Process(); 

#> 
<#+ 

public void WriteHeader(CodeStringGenerator codeStringGenerator, EntityFrameworkTemplateFileManager fileManager) 
{ 
    fileManager.StartHeader(); 
#> 
//------------------------------------------------------------------------------ 
// <auto-generated> 
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine1")#> 
// 
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine2")#> 
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine3")#> 
// </auto-generated> 
//------------------------------------------------------------------------------ 
<#=codeStringGenerator.UsingDirectives(inHeader: true)#> 
<#+ 
    fileManager.EndBlock(); 
} 

public void BeginNamespace(CodeGenerationTools code) 
{ 
    var codeNamespace = code.VsNamespaceSuggestion(); 
    if (!String.IsNullOrEmpty(codeNamespace)) 
    { 
#> 
namespace <#=code.EscapeNamespace(codeNamespace)#> 
{ 
<#+ 
     PushIndent(" "); 
    } 
} 

public void EndNamespace(CodeGenerationTools code) 
{ 
    if (!String.IsNullOrEmpty(code.VsNamespaceSuggestion())) 
    { 
     PopIndent(); 
#> 
} 
<#+ 
    } 
} 

public const string TemplateId = "CSharp_DbContext_Types_EF6"; 

public class CodeStringGenerator 
{ 
    private readonly CodeGenerationTools _code; 
    private readonly TypeMapper _typeMapper; 
    private readonly MetadataTools _ef; 

    public CodeStringGenerator(CodeGenerationTools code, TypeMapper typeMapper, MetadataTools ef) 
    { 
     ArgumentNotNull(code, "code"); 
     ArgumentNotNull(typeMapper, "typeMapper"); 
     ArgumentNotNull(ef, "ef"); 

     _code = code; 
     _typeMapper = typeMapper; 
     _ef = ef; 
    } 

    public string Property(EdmProperty edmProperty) 
    { 
     StringBuilder propertyCode = new StringBuilder(); 
     propertyCode.AppendFormat("private {0} _{1};",_typeMapper.GetTypeName(edmProperty.TypeUsage), _code.Escape(edmProperty)); 
     propertyCode.AppendFormat(
      CultureInfo.InvariantCulture, 
      "{0} {1} {2} {{ {3}get{{ return _{2};}} {4}set{{if(_{2} != value){{_{2} = value; OnPropertyChanged(\"{2}\");}}}}}}", 
      Accessibility.ForProperty(edmProperty), 
      _typeMapper.GetTypeName(edmProperty.TypeUsage), 
      _code.Escape(edmProperty), 
      _code.SpaceAfter(Accessibility.ForGetter(edmProperty)), 
      _code.SpaceAfter(Accessibility.ForSetter(edmProperty))); 

     return propertyCode.ToString(); 
    } 

    public string NavigationProperty(NavigationProperty navProp) 
    { 
     var endType = _typeMapper.GetTypeName(navProp.ToEndMember.GetEntityType()); 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1} {2} {{ {3}get; {4}set; }}", 
      AccessibilityAndVirtual(Accessibility.ForNavigationProperty(navProp)), 
      navProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ICollection<" + endType + ">") : endType, 
      _code.Escape(navProp), 
      _code.SpaceAfter(Accessibility.ForGetter(navProp)), 
      _code.SpaceAfter(Accessibility.ForSetter(navProp))); 
    } 

    public string AccessibilityAndVirtual(string accessibility) 
    { 
     return accessibility + (accessibility != "private" ? " virtual" : ""); 
    } 

    public string EntityClassOpening(EntityType entity) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1}partial class {2} : INotifyPropertyChanged{3}", 
      Accessibility.ForType(entity), 
      _code.SpaceAfter(_code.AbstractOption(entity)), 
      _code.Escape(entity), 
      _code.StringBefore(", ", _typeMapper.GetTypeName(entity.BaseType))); 
    } 

    public string EnumOpening(SimpleType enumType) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} enum {1} : {2}", 
      Accessibility.ForType(enumType), 
      _code.Escape(enumType), 
      _code.Escape(_typeMapper.UnderlyingClrType(enumType))); 
     } 

    public void WriteFunctionParameters(EdmFunction edmFunction, Action<string, string, string, string> writeParameter) 
    { 
     var parameters = FunctionImportParameter.Create(edmFunction.Parameters, _code, _ef); 
     foreach (var parameter in parameters.Where(p => p.NeedsLocalVariable)) 
     { 
      var isNotNull = parameter.IsNullableOfT ? parameter.FunctionParameterName + ".HasValue" : parameter.FunctionParameterName + " != null"; 
      var notNullInit = "new ObjectParameter(\"" + parameter.EsqlParameterName + "\", " + parameter.FunctionParameterName + ")"; 
      var nullInit = "new ObjectParameter(\"" + parameter.EsqlParameterName + "\", typeof(" + TypeMapper.FixNamespaces(parameter.RawClrTypeName) + "))"; 
      writeParameter(parameter.LocalVariableName, isNotNull, notNullInit, nullInit); 
     } 
    } 

    public string ComposableFunctionMethod(EdmFunction edmFunction, string modelNamespace) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} IQueryable<{1}> {2}({3})", 
      AccessibilityAndVirtual(Accessibility.ForMethod(edmFunction)), 
      _typeMapper.GetTypeName(_typeMapper.GetReturnType(edmFunction), modelNamespace), 
      _code.Escape(edmFunction), 
      string.Join(", ", parameters.Select(p => TypeMapper.FixNamespaces(p.FunctionParameterType) + " " + p.FunctionParameterName).ToArray())); 
    } 

    public string ComposableCreateQuery(EdmFunction edmFunction, string modelNamespace) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "return ((IObjectContextAdapter)this).ObjectContext.CreateQuery<{0}>(\"[{1}].[{2}]({3})\"{4});", 
      _typeMapper.GetTypeName(_typeMapper.GetReturnType(edmFunction), modelNamespace), 
      edmFunction.NamespaceName, 
      edmFunction.Name, 
      string.Join(", ", parameters.Select(p => "@" + p.EsqlParameterName).ToArray()), 
      _code.StringBefore(", ", string.Join(", ", parameters.Select(p => p.ExecuteParameterName).ToArray()))); 
    } 

    public string FunctionMethod(EdmFunction edmFunction, string modelNamespace, bool includeMergeOption) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 
     var returnType = _typeMapper.GetReturnType(edmFunction); 

     var paramList = String.Join(", ", parameters.Select(p => TypeMapper.FixNamespaces(p.FunctionParameterType) + " " + p.FunctionParameterName).ToArray()); 
     if (includeMergeOption) 
     { 
      paramList = _code.StringAfter(paramList, ", ") + "MergeOption mergeOption"; 
     } 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1} {2}({3})", 
      AccessibilityAndVirtual(Accessibility.ForMethod(edmFunction)), 
      returnType == null ? "int" : "ObjectResult<" + _typeMapper.GetTypeName(returnType, modelNamespace) + ">", 
      _code.Escape(edmFunction), 
      paramList); 
    } 

    public string ExecuteFunction(EdmFunction edmFunction, string modelNamespace, bool includeMergeOption) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 
     var returnType = _typeMapper.GetReturnType(edmFunction); 

     var callParams = _code.StringBefore(", ", String.Join(", ", parameters.Select(p => p.ExecuteParameterName).ToArray())); 
     if (includeMergeOption) 
     { 
      callParams = ", mergeOption" + callParams; 
     } 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction{0}(\"{1}\"{2});", 
      returnType == null ? "" : "<" + _typeMapper.GetTypeName(returnType, modelNamespace) + ">", 
      edmFunction.Name, 
      callParams); 
    } 

    public string DbSet(EntitySet entitySet) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} virtual DbSet<{1}> {2} {{ get; set; }}", 
      Accessibility.ForReadOnlyProperty(entitySet), 
      _typeMapper.GetTypeName(entitySet.ElementType), 
      _code.Escape(entitySet)); 
    } 

    public string UsingDirectives(bool inHeader, bool includeCollections = true) 
    { 
     return inHeader == string.IsNullOrEmpty(_code.VsNamespaceSuggestion()) 
      ? string.Format(
       CultureInfo.InvariantCulture, 
       "{0}using System;" + Environment.NewLine + 
       "using System.ComponentModel;{1}" + 
       "{2}", 
       inHeader ? Environment.NewLine : "", 
       includeCollections ? (Environment.NewLine + "using System.Collections.Generic;") : "", 
       inHeader ? "" : Environment.NewLine) 
      : ""; 
    } 
} 

public class TypeMapper 
{ 
    private const string ExternalTypeNameAttributeName = @"http://schemas.microsoft.com/ado/2006/04/codegeneration:ExternalTypeName"; 

    private readonly System.Collections.IList _errors; 
    private readonly CodeGenerationTools _code; 
    private readonly MetadataTools _ef; 

    public TypeMapper(CodeGenerationTools code, MetadataTools ef, System.Collections.IList errors) 
    { 
     ArgumentNotNull(code, "code"); 
     ArgumentNotNull(ef, "ef"); 
     ArgumentNotNull(errors, "errors"); 

     _code = code; 
     _ef = ef; 
     _errors = errors; 
    } 

    public static string FixNamespaces(string typeName) 
    { 
     return typeName.Replace("System.Data.Spatial.", "System.Data.Entity.Spatial."); 
    } 

    public string GetTypeName(TypeUsage typeUsage) 
    { 
     return typeUsage == null ? null : GetTypeName(typeUsage.EdmType, _ef.IsNullable(typeUsage), modelNamespace: null); 
    } 

    public string GetTypeName(EdmType edmType) 
    { 
     return GetTypeName(edmType, isNullable: null, modelNamespace: null); 
    } 

    public string GetTypeName(TypeUsage typeUsage, string modelNamespace) 
    { 
     return typeUsage == null ? null : GetTypeName(typeUsage.EdmType, _ef.IsNullable(typeUsage), modelNamespace); 
    } 

    public string GetTypeName(EdmType edmType, string modelNamespace) 
    { 
     return GetTypeName(edmType, isNullable: null, modelNamespace: modelNamespace); 
    } 

    public string GetTypeName(EdmType edmType, bool? isNullable, string modelNamespace) 
    { 
     if (edmType == null) 
     { 
      return null; 
     } 

     var collectionType = edmType as CollectionType; 
     if (collectionType != null) 
     { 
      return String.Format(CultureInfo.InvariantCulture, "ICollection<{0}>", GetTypeName(collectionType.TypeUsage, modelNamespace)); 
     } 

     var typeName = _code.Escape(edmType.MetadataProperties 
           .Where(p => p.Name == ExternalTypeNameAttributeName) 
           .Select(p => (string)p.Value) 
           .FirstOrDefault()) 
      ?? (modelNamespace != null && edmType.NamespaceName != modelNamespace ? 
       _code.CreateFullName(_code.EscapeNamespace(edmType.NamespaceName), _code.Escape(edmType)) : 
       _code.Escape(edmType)); 

     if (edmType is StructuralType) 
     { 
      return typeName; 
     } 

     if (edmType is SimpleType) 
     { 
      var clrType = UnderlyingClrType(edmType); 
      if (!IsEnumType(edmType)) 
      { 
       typeName = _code.Escape(clrType); 
      } 

      typeName = FixNamespaces(typeName); 

      return clrType.IsValueType && isNullable == true ? 
       String.Format(CultureInfo.InvariantCulture, "Nullable<{0}>", typeName) : 
       typeName; 
     } 

     throw new ArgumentException("edmType"); 
    } 

    public Type UnderlyingClrType(EdmType edmType) 
    { 
     ArgumentNotNull(edmType, "edmType"); 

     var primitiveType = edmType as PrimitiveType; 
     if (primitiveType != null) 
     { 
      return primitiveType.ClrEquivalentType; 
     } 

     if (IsEnumType(edmType)) 
     { 
      return GetEnumUnderlyingType(edmType).ClrEquivalentType; 
     } 

     return typeof(object); 
    } 

    public object GetEnumMemberValue(MetadataItem enumMember) 
    { 
     ArgumentNotNull(enumMember, "enumMember"); 

     var valueProperty = enumMember.GetType().GetProperty("Value"); 
     return valueProperty == null ? null : valueProperty.GetValue(enumMember, null); 
    } 

    public string GetEnumMemberName(MetadataItem enumMember) 
    { 
     ArgumentNotNull(enumMember, "enumMember"); 

     var nameProperty = enumMember.GetType().GetProperty("Name"); 
     return nameProperty == null ? null : (string)nameProperty.GetValue(enumMember, null); 
    } 

    public System.Collections.IEnumerable GetEnumMembers(EdmType enumType) 
    { 
     ArgumentNotNull(enumType, "enumType"); 

     var membersProperty = enumType.GetType().GetProperty("Members"); 
     return membersProperty != null 
      ? (System.Collections.IEnumerable)membersProperty.GetValue(enumType, null) 
      : Enumerable.Empty<MetadataItem>(); 
    } 

    public bool EnumIsFlags(EdmType enumType) 
    { 
     ArgumentNotNull(enumType, "enumType"); 

     var isFlagsProperty = enumType.GetType().GetProperty("IsFlags"); 
     return isFlagsProperty != null && (bool)isFlagsProperty.GetValue(enumType, null); 
    } 

    public bool IsEnumType(GlobalItem edmType) 
    { 
     ArgumentNotNull(edmType, "edmType"); 

     return edmType.GetType().Name == "EnumType"; 
    } 

    public PrimitiveType GetEnumUnderlyingType(EdmType enumType) 
    { 
     ArgumentNotNull(enumType, "enumType"); 

     return (PrimitiveType)enumType.GetType().GetProperty("UnderlyingType").GetValue(enumType, null); 
    } 

    public string CreateLiteral(object value) 
    { 
     if (value == null || value.GetType() != typeof(TimeSpan)) 
     { 
      return _code.CreateLiteral(value); 
     } 

     return string.Format(CultureInfo.InvariantCulture, "new TimeSpan({0})", ((TimeSpan)value).Ticks); 
    } 

    public bool VerifyCaseInsensitiveTypeUniqueness(IEnumerable<string> types, string sourceFile) 
    { 
     ArgumentNotNull(types, "types"); 
     ArgumentNotNull(sourceFile, "sourceFile"); 

     var hash = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase); 
     if (types.Any(item => !hash.Add(item))) 
     { 
      _errors.Add(
       new CompilerError(sourceFile, -1, -1, "6023", 
        String.Format(CultureInfo.CurrentCulture, CodeGenerationTools.GetResourceString("Template_CaseInsensitiveTypeConflict")))); 
      return false; 
     } 
     return true; 
    } 

    public IEnumerable<SimpleType> GetEnumItemsToGenerate(IEnumerable<GlobalItem> itemCollection) 
    { 
     return GetItemsToGenerate<SimpleType>(itemCollection) 
      .Where(e => IsEnumType(e)); 
    } 

    public IEnumerable<T> GetItemsToGenerate<T>(IEnumerable<GlobalItem> itemCollection) where T: EdmType 
    { 
     return itemCollection 
      .OfType<T>() 
      .Where(i => !i.MetadataProperties.Any(p => p.Name == ExternalTypeNameAttributeName)) 
      .OrderBy(i => i.Name); 
    } 

    public IEnumerable<string> GetAllGlobalItems(IEnumerable<GlobalItem> itemCollection) 
    { 
     return itemCollection 
      .Where(i => i is EntityType || i is ComplexType || i is EntityContainer || IsEnumType(i)) 
      .Select(g => GetGlobalItemName(g)); 
    } 

    public string GetGlobalItemName(GlobalItem item) 
    { 
     if (item is EdmType) 
     { 
      return ((EdmType)item).Name; 
     } 
     else 
     { 
      return ((EntityContainer)item).Name; 
     } 
    } 

    public IEnumerable<EdmProperty> GetSimpleProperties(EntityType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetSimpleProperties(ComplexType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetComplexProperties(EntityType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetComplexProperties(ComplexType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetPropertiesWithDefaultValues(EntityType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type && p.DefaultValue != null); 
    } 

    public IEnumerable<EdmProperty> GetPropertiesWithDefaultValues(ComplexType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type && p.DefaultValue != null); 
    } 

    public IEnumerable<NavigationProperty> GetNavigationProperties(EntityType type) 
    { 
     return type.NavigationProperties.Where(np => np.DeclaringType == type); 
    } 

    public IEnumerable<NavigationProperty> GetCollectionNavigationProperties(EntityType type) 
    { 
     return type.NavigationProperties.Where(np => np.DeclaringType == type && np.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many); 
    } 

    public FunctionParameter GetReturnParameter(EdmFunction edmFunction) 
    { 
     ArgumentNotNull(edmFunction, "edmFunction"); 

     var returnParamsProperty = edmFunction.GetType().GetProperty("ReturnParameters"); 
     return returnParamsProperty == null 
      ? edmFunction.ReturnParameter 
      : ((IEnumerable<FunctionParameter>)returnParamsProperty.GetValue(edmFunction, null)).FirstOrDefault(); 
    } 

    public bool IsComposable(EdmFunction edmFunction) 
    { 
     ArgumentNotNull(edmFunction, "edmFunction"); 

     var isComposableProperty = edmFunction.GetType().GetProperty("IsComposableAttribute"); 
     return isComposableProperty != null && (bool)isComposableProperty.GetValue(edmFunction, null); 
    } 

    public IEnumerable<FunctionImportParameter> GetParameters(EdmFunction edmFunction) 
    { 
     return FunctionImportParameter.Create(edmFunction.Parameters, _code, _ef); 
    } 

    public TypeUsage GetReturnType(EdmFunction edmFunction) 
    { 
     var returnParam = GetReturnParameter(edmFunction); 
     return returnParam == null ? null : _ef.GetElementType(returnParam.TypeUsage); 
    } 

    public bool GenerateMergeOptionFunction(EdmFunction edmFunction, bool includeMergeOption) 
    { 
     var returnType = GetReturnType(edmFunction); 
     return !includeMergeOption && returnType != null && returnType.EdmType.BuiltInTypeKind == BuiltInTypeKind.EntityType; 
    } 
} 

public static void ArgumentNotNull<T>(T arg, string name) where T : class 
{ 
    if (arg == null) 
    { 
     throw new ArgumentNullException(name); 
    } 
} 
#>