Nel namespace MS.Internal
, esiste una classe denominata NamedObject
.Cosa fa {{{0}}} su string.Formato fare?
Ha un blocco di strano di codice:
public override string ToString()
{
if (_name[0] != '{')
{
// lazily add {} around the name, to avoid allocating a string
// until it's actually needed
_name = String.Format(CultureInfo.InvariantCulture, "{{{0}}}", _name);
}
return _name;
}
Sono curioso di sapere questo commento specifico:
// lazily add {} around the name, to avoid allocating a string
// until it's actually needed
_name = String.Format(CultureInfo.InvariantCulture, "{{{0}}}", _name);
Come è che 'pigro'? Cosa fa per essere pigro?
classe completa dal reference source:
//----------------------------------------------------------------------------
//
// <copyright file="NamedObject.cs" company="Microsoft">
// Copyright (C) Microsoft Corporation. All rights reserved.
// </copyright>
//
// Description: Placeholder object, with a name that appears in the debugger
//
//---------------------------------------------------------------------------
using System;
using System.Globalization;
using MS.Internal.WindowsBase;
namespace MS.Internal
{
/// <summary>
/// An instance of this class can be used wherever you might otherwise use
/// "new Object()". The name will show up in the debugger, instead of
/// merely "{object}"
/// </summary>
[FriendAccessAllowed] // Built into Base, also used by Framework.
internal class NamedObject
{
public NamedObject(string name)
{
if (String.IsNullOrEmpty(name))
throw new ArgumentNullException(name);
_name = name;
}
public override string ToString()
{
if (_name[0] != '{')
{
// lazily add {} around the name, to avoid allocating a string
// until it's actually needed
_name = String.Format(CultureInfo.InvariantCulture, "{{{0}}}", _name);
}
return _name;
}
string _name;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
Si assegna solo _name volta se non già fatto –
E 'considerato come pigri perché la la stringa con parentesi graffa non viene generata fino alla prima chiamata a 'ToString()'. Puoi leggere * pigro * come * su richiesta * qui. –
@ FrédéricHamidi oh, questo è un piccolo trucco subdolo – Mafii