Assembly.IsDefined(Type, Boolean) 方法
定义
重要
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指示指定的属性是否已应用于该程序集。
public:
virtual bool IsDefined(Type ^ attributeType, bool inherit);public virtual bool IsDefined (Type attributeType, bool inherit);abstract member IsDefined : Type * bool -> bool
override this.IsDefined : Type * bool -> boolPublic Overridable Function IsDefined (attributeType As Type, inherit As Boolean) As Boolean参数
- attributeType
- Type
要为此程序集检查的属性类型。
- inherit
- Boolean
对于该类型的对象，将忽略此自变量。
返回
如果已将该属性应用于程序集，则为 true；否则为 false。
实现
例外
attributeType 为 null。
attributeType 使用的类型无效。
示例
下面的代码示例将 AssemblyTitleAttribute 特性应用于程序集，然后使用 IsDefined 指示是否已应用该特性。 它还测试未应用的属性。
using System;
using System.Reflection;
// Set an assembly attribute.
[assembly:AssemblyTitleAttribute("A title example")]
// Note that the suffix "Attribute" can be omitted:
// [assembly:AssemblyTitle("A title example")]
public class Test {
public static void Main() {
// Get the assembly that is executing this method.
Assembly asm = Assembly.GetCallingAssembly();
// Get the attribute type just defined.
Type aType = typeof(AssemblyTitleAttribute);
Console.WriteLine(asm.IsDefined(aType, false));
// Try an attribute not defined.
aType = typeof(AssemblyVersionAttribute);
Console.WriteLine(asm.IsDefined(aType, false));
}
}
//
// This code example produces the following output:
// True
// False
//
Imports System.Reflection
' Set an assembly attribute.
<Assembly:AssemblyTitleAttribute("A title example")>
' Note that the suffix "Attribute" can be omitted:
' <Assembly:AssemblyTitle("A title examle")>
Public Class Test
Public Shared Sub Main()
' Get the assembly that is executing this method.
Dim asm As [Assembly] = [Assembly].GetCallingAssembly
' Get the attribute type just defined.
Dim aType As Type = GetType(AssemblyTitleAttribute)
Console.WriteLine(asm.IsDefined(aType, false))
' Try an attribute not defined.
aType = GetType(AssemblyVersionAttribute)
Console.WriteLine(asm.IsDefined(aType, false))
End Sub
End Class
' This code example produces the following output:
' True
' False
'
