Assembly.IsDefined(Type, Boolean) 方法

定義

命名空間:

System.Reflection

組件:

System.Runtime.dll

組件:

netstandard.dll

組件:

mscorlib.dll

指出是否已將指定的屬性套用至組件。

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

參數

attributeType

Type

這個組件中要加以檢查的屬性類型。

inherit

Boolean

這個類型的物件會忽略這個引數。

傳回

Boolean

如果已將屬性套用至組件，則為 true，否則為 false。

實作

IsDefined(Type, Boolean) IsDefined(Type, Boolean)

例外狀況

ArgumentNullException

attributeType 為 null。

ArgumentException

attributeType 使用無效的類型。

範例

下列程式碼範例會將 AssemblyTitleAttribute 屬性套用至元件，然後使用 IsDefined 來指出它是否已套用。 它也會測試未套用的屬性。

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
'