Module.IsDefined Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Determines if the specified attribute type is applied to this module.
Namespace: System.Reflection
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Overridable Function IsDefined ( _
attributeType As Type, _
inherit As Boolean _
) As Boolean
public virtual bool IsDefined(
Type attributeType,
bool inherit
)
Parameters
- attributeType
Type: System.Type
The type of custom attribute to search for.
- inherit
Type: System.Boolean
This argument is ignored for objects of this type.
Return Value
Type: System.Boolean
true if one or more instances of attributeType are applied to this module; otherwise, false.
Implements
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | attributeType is nulla null reference (Nothing in Visual Basic). |
| ArgumentException | attributeType is not a Type object supplied by the runtime. For example, attributeType is a TypeBuilder object. |
Examples
The following example defines an attribute, applies it to the example's module , and uses the IsDefined method to show that the attribute was applied to the module.
.gif "Note") Note: |
|---|
To run this example, see Building Examples That Use a Demo Method and a TextBlock Control. |
Imports System.Reflection
' Define a module-level attribute.
<Module: MySimpleAttribute("module-level")>
Class Example
Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)
Dim moduleArray() As [Module] = _
[Assembly].GetExecutingAssembly().GetModules()
Dim myModule As [Module] = moduleArray(0)
outputBlock.Text &= _
String.Format("IsDefined(MySimpleAttribute) = {0}" & vbLf, _
myModule.IsDefined(GetType(MySimpleAttribute), False))
End Sub
End Class
'A very simple custom attribute.
<AttributeUsage(AttributeTargets.Class Or AttributeTargets.Module)> _
Public Class MySimpleAttribute
Inherits Attribute
Private name As String
Public Sub New(ByVal newName As String)
name = newName
End Sub
End Class
' This example produces output similar to the following:
'
'IsDefined(MySimpleAttribute) = True
using System;
using System.Reflection;
//Define a module-level attribute.
[module: MySimpleAttribute("module-level")]
class Example
{
public static void Demo(System.Windows.Controls.TextBlock outputBlock)
{
Module[] moduleArray = Assembly.GetExecutingAssembly().GetModules();
Module myModule = moduleArray[0];
outputBlock.Text +=
String.Format("IsDefined(MySimpleAttribute) = {0}\n",
myModule.IsDefined(typeof(MySimpleAttribute), false));
}
}
//A very simple custom attribute.
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Module)]
public class MySimpleAttribute : Attribute
{
private string name;
public MySimpleAttribute(string newName)
{
name = newName;
}
}
/* This example produces output similar to the following:
IsDefined(MySimpleAttribute) = True
*/
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.