网上演练
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#if NET20 || NET30 || NET35 || NET40 || !NET_4_6
namespace System.Runtime.CompilerServices
{
/// <summary>
/// Allows you to obtain the method or property name of the caller to the method.
/// </summary>
/// <remarks>
/// You apply the <b>CallerMemberName</b> attribute to an optional parameter that has a default value.
/// You must specify an explicit default value for the optional parameter.
/// You can't apply this attribute to parameters that aren't specified as optional.
/// <para/>
/// You can use the <b>CallerMemberName</b> attribute to avoid specifying the member name as a <b>String</b> argument to the called method.
/// By using this technique, you avoid the problem that <b>Rename Refactoring</b> doesn't change the <b>String</b> values.
/// This is especially useful for the following tasks:
/// <list type="bullet">
/// <item>
/// Using tracing and diagnostic routines.
/// </item>
/// <item>
/// Implementing the <see cref="System.ComponentModel.INotifyPropertyChanged"/> interface when binding data.
/// This interface allows the property of an object to notify a bound control that the property has changed,
/// so that the control can display the updated information.
/// Without the CallerMemberName attribute, you must specify the property name as a literal.
/// </item>
/// </list>
/// </remarks>
[AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
public sealed class CallerMemberNameAttribute : Attribute
{
[TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]
public CallerMemberNameAttribute()
{
// Empty
// This constructor is not redundant
// You cannot put attributes on the default constructor
}
}
}
#endif