Assembly.IsDefined(Type, Boolean) 方法

定义

命名空间:

System.Reflection

程序集:

netstandard.dll, System.Runtime.dll

Source:

Assembly.cs

指示是否已将指定的属性应用于程序集。

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 -> bool

Public Overridable Function IsDefined (attributeType As Type, inherit As Boolean) As Boolean

参数

attributeType

Type

要检查此程序集的属性的类型。

inherit

Boolean

对于此类型的对象，忽略此参数。

返回

Boolean

true 如果特性已应用于程序集，则为否则，为 false.

实现

IsDefined(Type, Boolean)

例外

ArgumentNullException

attributeType 是 null。

ArgumentException

attributeType 使用无效类型。

示例

下面的代码示例将 AssemblyTitleAttribute 属性应用于程序集，然后使用 IsDefined 它指示是否已应用它。 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
'