CustomAttributeBuilder Class
Helps build custom attributes.
Assembly: mscorlib (in mscorlib.dll)
| Name | Description | |
|---|---|---|
![]() | CustomAttributeBuilder(ConstructorInfo, Object()) | Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute and the arguments to the constructor. |
![]() | CustomAttributeBuilder(ConstructorInfo, Object(), FieldInfo(), Object()) | Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute, the arguments to the constructor, and a set of named field/value pairs. |
![]() | CustomAttributeBuilder(ConstructorInfo, Object(), PropertyInfo(), Object()) | Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute, the arguments to the constructor, and a set of named property or value pairs. |
![]() | CustomAttributeBuilder(ConstructorInfo, Object(), PropertyInfo(), Object(), FieldInfo(), Object()) | Initializes an instance of the CustomAttributeBuilder class given the constructor for the custom attribute, the arguments to the constructor, a set of named property or value pairs, and a set of named field or value pairs. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
| Name | Description | |
|---|---|---|
![]() ![]() | _CustomAttributeBuilder.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr) | Maps a set of names to a corresponding set of dispatch identifiers. |
![]() ![]() | _CustomAttributeBuilder.GetTypeInfo(UInt32, UInt32, IntPtr) | Retrieves the type information for an object, which can then be used to get the type information for an interface. |
![]() ![]() | _CustomAttributeBuilder.GetTypeInfoCount(UInt32) | Retrieves the number of type information interfaces that an object provides (either 0 or 1). |
![]() ![]() | _CustomAttributeBuilder.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr) | Provides access to properties and methods exposed by an object. |
Use the CustomAttributeBuilder object returned by the constructor to describe the custom attribute. Associate the CustomAttribute with a builder instance by calling the SetCustomAttribute method on that builder instance. For example, create a CustomAttributeBuilder to describe an instance of AssemblyCultureAttribute by supplying the constructor of AssemblyCultureAttribute and its argument. Then call SetCustomAttribute on an AssemblyBuilder to establish the association.
The following code sample illustrates the use of CustomAttributeBuilder.
Imports System Imports System.Threading Imports System.Reflection Imports System.Reflection.Emit _ ' We will apply this custom attribute to our dynamic type. Public Class ClassCreator Inherits Attribute Private creator As String Public ReadOnly Property GetCreator() As String Get Return creator End Get End Property Public Sub New(name As String) Me.creator = name End Sub 'NewNew End Class 'ClassCreator _ ' We will apply this dynamic attribute to our dynamic method. Public Class DateLastUpdated Inherits Attribute Private dateUpdated As String Public ReadOnly Property GetDateUpdated() As String Get Return dateUpdated End Get End Property Public Sub New(theDate As String) Me.dateUpdated = theDate End Sub 'NewNew End Class 'DateLastUpdated _ Class MethodBuilderCustomAttributesDemo Public Shared Function BuildTypeWithCustomAttributesOnMethod() As Type Dim currentDomain As AppDomain = Thread.GetDomain() Dim myAsmName As New AssemblyName() myAsmName.Name = "MyAssembly" Dim myAsmBuilder As AssemblyBuilder = currentDomain.DefineDynamicAssembly(myAsmName, _ AssemblyBuilderAccess.Run) Dim myModBuilder As ModuleBuilder = myAsmBuilder.DefineDynamicModule("MyModule") ' First, we'll build a type with a custom attribute attached. Dim myTypeBuilder As TypeBuilder = myModBuilder.DefineType("MyType", _ TypeAttributes.Public) Dim ctorParams() As Type = {GetType(String)} Dim classCtorInfo As ConstructorInfo = GetType(ClassCreator).GetConstructor(ctorParams) Dim myCABuilder As New CustomAttributeBuilder(classCtorInfo, _ New Object() {"Joe Programmer"}) myTypeBuilder.SetCustomAttribute(myCABuilder) ' Now, let's build a method and add a custom attribute to it. Dim myMethodBuilder As MethodBuilder = myTypeBuilder.DefineMethod("HelloWorld", _ MethodAttributes.Public, Nothing, New Type() {}) ctorParams = New Type() {GetType(String)} classCtorInfo = GetType(DateLastUpdated).GetConstructor(ctorParams) Dim myCABuilder2 As New CustomAttributeBuilder(classCtorInfo, _ New Object() {DateTime.Now.ToString()}) myMethodBuilder.SetCustomAttribute(myCABuilder2) Dim myIL As ILGenerator = myMethodBuilder.GetILGenerator() myIL.EmitWriteLine("Hello, world!") myIL.Emit(OpCodes.Ret) Return myTypeBuilder.CreateType() End Function 'BuildTypeWithCustomAttributesOnMethod Public Shared Sub Main() Dim myType As Type = BuildTypeWithCustomAttributesOnMethod() Dim myInstance As Object = Activator.CreateInstance(myType) Dim customAttrs As Object() = myType.GetCustomAttributes(True) Console.WriteLine("Custom Attributes for Type 'MyType':") Dim attrVal As Object = Nothing Dim customAttr As Object For Each customAttr In customAttrs attrVal = GetType(ClassCreator).InvokeMember("GetCreator", _ BindingFlags.GetProperty, _ Nothing, customAttr, New Object() {}) Console.WriteLine("-- Attribute: [{0} = ""{1}""]", customAttr, attrVal) Next customAttr Console.WriteLine("Custom Attributes for Method 'HelloWorld()' in 'MyType':") customAttrs = myType.GetMember("HelloWorld")(0).GetCustomAttributes(True) For Each customAttr In customAttrs attrVal = GetType(DateLastUpdated).InvokeMember("GetDateUpdated", _ BindingFlags.GetProperty, _ Nothing, customAttr, New Object() {}) Console.WriteLine("-- Attribute: [{0} = ""{1}""]", customAttr, attrVal) Next customAttr Console.WriteLine("---") Console.WriteLine(myType.InvokeMember("HelloWorld", BindingFlags.InvokeMethod, _ Nothing, myInstance, New Object() {})) End Sub 'Main End Class 'MethodBuilderCustomAttributesDemo
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 8.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.



