Assembly.IsDefined 方法
指示指定的属性是否已应用于该程序集。
**命名空间:**System.Reflection
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
Public Overridable Function IsDefined ( _
attributeType As Type, _
inherit As Boolean _
) As Boolean
用法
Dim instance As Assembly
Dim attributeType As Type
Dim inherit As Boolean
Dim returnValue As Boolean
returnValue = instance.IsDefined(attributeType, inherit)
public virtual bool IsDefined (
Type attributeType,
bool inherit
)
public:
virtual bool IsDefined (
Type^ attributeType,
bool inherit
)
public boolean IsDefined (
Type attributeType,
boolean inherit
)
public function IsDefined (
attributeType : Type,
inherit : boolean
) : boolean
参数
- attributeType
要为此程序集检查的属性的 Type。
- inherit
对于该类型的对象，该参数被忽略。
返回值
如果已将该属性应用于程序集，则为 true；否则为 false。
异常
| 异常类型 | 条件 |
|---|---|
attributeType 为 空引用（在 Visual Basic 中为 Nothing）。 |
示例
下面的代码示例定义一个属性，然后使用 IsDefined 指示是否已定义该属性。还对未定义的属性进行测试。
Imports System
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
' The output is:
' True
' False
'
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));
}
}
//
// The output is:
// True
// False
//
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0