Type.IsContextfulImpl Method
Implements the IsContextful property and determines whether the Type can be hosted in a context.
[Visual Basic] Protected Overridable Function IsContextfulImpl() As Boolean [C#] protected virtual bool IsContextfulImpl(); [C++] protected: virtual bool IsContextfulImpl(); [JScript] protected function IsContextfulImpl() : Boolean;
Return Value
true if the Type can be hosted in a context; otherwise, false.
Remarks
This method can be overridden by a derived class.
A context intercepts calls to the class members and enforce policies that are applied to the class, such as synchronization.
Example
[Visual Basic, C#, C++] The following example demonstrates a use of the IsContextfulImpl method.
[Visual Basic] Imports System Imports System.Reflection Imports Microsoft.VisualBasic Public Class MyTypeDelegatorClass Inherits TypeDelegator Public myElementType As String = Nothing Private myType As Type = Nothing Public Sub New(ByVal myType As Type) MyBase.New(myType) Me.myType = myType End Sub 'New ' Override IsContextfulImpl. Protected Overrides Function IsContextfulImpl() As Boolean ' Check whether the type is contextful. If myType.IsContextful Then myElementType = " is contextful " Return True End If Return False End Function 'IsContextfulImpl End Class 'MyTypeDelegatorClass Public Class MyTypeDemoClass Public Shared Sub Main() Try Dim myType As MyTypeDelegatorClass Console.WriteLine("Check whether MyContextBoundClass can be hosted in a context.") ' Check whether MyContextBoundClass is contextful. myType = New MyTypeDelegatorClass(GetType(MyContextBoundClass)) If myType.IsContextful Then Console.WriteLine(GetType(MyContextBoundClass).ToString() + " can be hosted in a context.") Else Console.WriteLine(GetType(MyContextBoundClass).ToString() + " cannot be hosted in a context.") End If ' Check whether the int type is contextful. myType = New MyTypeDelegatorClass(GetType(MyTypeDemoClass)) Console.WriteLine(ControlChars.NewLine + "Check whether MyTypeDemoClass can be hosted in a context.") If myType.IsContextful Then Console.WriteLine(GetType(MyTypeDemoClass).ToString() + " can be hosted in a context.") Else Console.WriteLine(GetType(MyTypeDemoClass).ToString() + " cannot be hosted in a context.") End If Catch e As Exception Console.WriteLine("Exception: {0}", e.Message.ToString()) End Try End Sub 'Main End Class 'MyTypeDemoClass ' This class demonstrates the IsContextfulImpl method. Public Class MyContextBoundClass Inherits ContextBoundObject Public myString As String = "This class is used to demonstrate members of the Type class." End Class 'MyContextBoundClass [C#] using System; using System.Reflection; public class MyTypeDelegatorClass : TypeDelegator { public string myElementType = null; private Type myType = null ; public MyTypeDelegatorClass(Type myType) : base(myType) { this.myType = myType; } // Override IsContextfulImpl. protected override bool IsContextfulImpl() { // Check whether the type is contextful. if(myType.IsContextful) { myElementType = " is contextful "; return true; } return false; } } public class MyTypeDemoClass { public static void Main() { try { MyTypeDelegatorClass myType; Console.WriteLine ("Check whether MyContextBoundClass can be hosted in a context."); // Check whether MyContextBoundClass is contextful. myType = new MyTypeDelegatorClass(typeof(MyContextBoundClass)); if( myType.IsContextful) { Console.WriteLine(typeof(MyContextBoundClass) + " can be hosted in a context."); } else { Console.WriteLine(typeof(MyContextBoundClass) + " cannot be hosted in a context."); } // Check whether the int type is contextful. myType = new MyTypeDelegatorClass(typeof(MyTypeDemoClass)); Console.WriteLine ("\nCheck whether MyTypeDemoClass can be hosted in a context."); if( myType.IsContextful) { Console.WriteLine(typeof(MyTypeDemoClass) + " can be hosted in a context."); } else { Console.WriteLine(typeof(MyTypeDemoClass) + " cannot be hosted in a context."); } } catch( Exception e ) { Console.WriteLine("Exception: {0}", e.Message); } } } // This class demonstrates IsContextfulImpl. public class MyContextBoundClass : ContextBoundObject { public string myString = "This class is used to demonstrate members of the Type class."; } [C++] #using <mscorlib.dll> using namespace System; using namespace System::Reflection; public __gc class MyTypeDelegatorClass : public TypeDelegator { public: String* myElementType; private: Type* myType; public: MyTypeDelegatorClass(Type* myType) : TypeDelegator(myType) { this->myType = myType; } // Override IsContextfulImpl. protected: bool IsContextfulImpl() { // Check whether the type is contextful. if (myType->IsContextful) { myElementType = S" is contextful "; return true; } return false; } }; public __gc class MyTypeDemoClass { }; // This class demonstrates IsContextfulImpl. public __gc class MyContextBoundClass : public ContextBoundObject { public: String* myString; }; int main() { try { MyTypeDelegatorClass* myType; Console::WriteLine (S"Check whether MyContextBoundClass can be hosted in a context."); // Check whether MyContextBoundClass is contextful. myType = new MyTypeDelegatorClass(__typeof(MyContextBoundClass)); if (myType->IsContextful) { Console::WriteLine(S"{0} can be hosted in a context.", __typeof(MyContextBoundClass)); } else { Console::WriteLine(S"{0} cannot be hosted in a context.", __typeof(MyContextBoundClass)); } // Check whether the int type is contextful. myType = new MyTypeDelegatorClass(__typeof(MyTypeDemoClass)); Console::WriteLine (S"\nCheck whether MyTypeDemoClass can be hosted in a context."); if (myType->IsContextful) { Console::WriteLine(S"{0} can be hosted in a context.", __typeof(MyTypeDemoClass)); } else { Console::WriteLine(S"{0} cannot be hosted in a context.", __typeof(MyTypeDemoClass)); } } catch (Exception* e) { Console::WriteLine(S"Exception: {0}", e->Message); } }
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Requirements
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family