Type.IsContextful 属性
获取一个值，通过该值指示 Type 在上下文中是否可以被承载。
**命名空间:**System
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
Public ReadOnly Property IsContextful As Boolean
用法
Dim instance As Type
Dim value As Boolean
value = instance.IsContextful
public bool IsContextful { get; }
public:
virtual property bool IsContextful {
bool get () sealed;
}
/** @property */
public final boolean get_IsContextful ()
public final function get IsContextful () : boolean
属性值
如果 Type 能够在某个上下文中承载，则为 true；否则为 false。
备注
上下文截获对类成员的调用，并实施应用到类的策略（例如同步）。有关远程上下文的更详细的信息，请参见 Context。
如果当前 Type 表示泛型类型或泛型方法的定义中的类型参数，则此属性始终返回 false。
示例
下面的示例演示 Type 类的 IsContextful、IsMarshalByRef 和 IsPrimitive 属性。它将检查给定类型可否在上下文中承载，该类型可否按引用来进行封送，以及该类型是否是基元数据类型。
Imports System
Imports System.Runtime.Remoting.Contexts
Imports Microsoft.VisualBasic
Public Class MyContextBoundClass
Inherits ContextBoundObject
Public myString As String = "This class demonstrates the IsContextful, IsMarshalByRef, and IsPrimitive properties."
End Class 'MyContextBoundClass
Public Class MyTypeDemoClass
Public Shared Sub Main()
Try
' Determine whether the types can be hosted in a Context.
Console.WriteLine("The Contextful property for the {0} type is {1}.", GetType(MyTypeDemoClass).Name, GetType(MyTypeDemoClass).IsContextful.ToString())
Console.WriteLine("The Contextful property for the {0} type is {1}.", GetType(MyContextBoundClass).Name, GetType(MyContextBoundClass).IsContextful.ToString())
' Determine whether the types are marshalled by reference.
Console.WriteLine("The MarshalByRef property of {0} is {1}.", GetType(MyTypeDemoClass).Name, GetType(MyTypeDemoClass).IsMarshalByRef.ToString())
Console.WriteLine("The MarshalByRef property of {0} is {1}.", GetType(MyContextBoundClass).Name, GetType(MyContextBoundClass).IsMarshalByRef.ToString())
' Determine whether the types are primitive datatypes.
Console.WriteLine("Is {0} a primitive data type? {1}.", GetType(Integer).Name, GetType(Integer).IsPrimitive.ToString())
Console.WriteLine("Is {0} a primitive data type? {1}.", GetType(String).Name, GetType(String).IsPrimitive.ToString())
Catch e As Exception
Console.WriteLine("An exception occurred: " + e.Message.ToString())
End Try
End Sub 'Main
End Class 'MyTypeDemoClass
using System;
using System.Runtime.Remoting.Contexts;
public class MyContextBoundClass: ContextBoundObject
{
public string myString = "This class demonstrates the IsContextful, IsMarshalByRef, and IsPrimitive properties.";
}
public class MyTypeDemoClass
{
public static void Main()
{
try
{
// Determine whether the types can be hosted in a Context.
Console.WriteLine ("The IsContextful property for the {0} type is {1}.", typeof(MyTypeDemoClass).Name, typeof(MyTypeDemoClass).IsContextful);
Console.WriteLine ("The IsContextful property for the {0} type is {1}.", typeof(MyContextBoundClass).Name, typeof(MyContextBoundClass).IsContextful);
// Determine whether the types are marshalled by reference.
Console.WriteLine ("The MarshalByRef property of {0} is {1}.", typeof(MyTypeDemoClass).Name, typeof(MyTypeDemoClass).IsMarshalByRef);
Console.WriteLine ("The MarshalByRef property of {0} is {1}.", typeof(MyContextBoundClass).Name, typeof(MyContextBoundClass).IsMarshalByRef);
// Determine whether the types are primitive datatypes.
Console.WriteLine ("Is {0} is a primitive data type? {1}.", typeof(int).Name, typeof(int).IsPrimitive);
Console.WriteLine ("Is {0} a primitive data type? {1}.", typeof(string).Name, typeof(string).IsPrimitive);
}
catch (Exception e)
{
Console.WriteLine("An exception occurred: " + e.Message);
}
}
}
using namespace System;
using namespace System::Runtime::Remoting::Contexts;
public ref class MyContextBoundClass: public ContextBoundObject
{
public:
String^ myString;
};
public ref class MyTypeDemoClass
{
public:
void Demo()
{
try
{
// Determine whether the types can be hosted in a Context.
Console::WriteLine( "The IsContextful property for the {0} type is {1}.", MyTypeDemoClass::typeid->Name, MyTypeDemoClass::typeid->IsContextful );
Console::WriteLine( "The IsContextful property for the {0} type is {1}.", MyContextBoundClass::typeid->Name, MyContextBoundClass::typeid->IsContextful );
// Determine whether the types are marshalled by reference.
Console::WriteLine( "The MarshalByRef property of {0} is {1}.", MyTypeDemoClass::typeid->Name, MyTypeDemoClass::typeid->IsMarshalByRef );
Console::WriteLine( "The MarshalByRef property of {0} is {1}.", MyContextBoundClass::typeid->Name, MyContextBoundClass::typeid->IsMarshalByRef );
// Determine whether the types are primitive datatypes.
Console::WriteLine( "Is {0} is a primitive data type? {1}.", int::typeid->Name, int::typeid->IsPrimitive );
Console::WriteLine( "Is {0} a primitive data type? {1}.", String::typeid->Name, String::typeid->IsPrimitive );
}
catch ( Exception^ e )
{
Console::WriteLine( "An exception occurred: {0}", e->Message );
}
}
};
int main()
{
MyTypeDemoClass^ mtdc = gcnew MyTypeDemoClass;
mtdc->Demo();
}
import System.*;
import System.Runtime.Remoting.Contexts.*;
public class MyContextBoundClass extends ContextBoundObject
{
public String myString = "This class demonstrates the IsContextful, "
+"IsMarshalByRef, and IsPrimitive properties.";
} //MyContextBoundClass
public class MyTypeDemoClass
{
public static void main(String[] args)
{
try {
// Determine whether the types can be hosted in a Context.
Console.WriteLine("The IsContextful property for the"
+" {0} type is {1}.", MyTypeDemoClass.class.ToType().get_Name(),
System.Convert.ToString(MyTypeDemoClass.class.ToType().
get_IsContextful()));
Console.WriteLine("The IsContextful property for the"
+" {0} type is {1}.", MyContextBoundClass.class.ToType().
get_Name(), System.Convert.ToString(MyContextBoundClass.class.
ToType().get_IsContextful()));
// Determine whether the types are marshalled by reference.
Console.WriteLine("The MarshalByRef property of {0} is {1}.",
MyTypeDemoClass.class.ToType().get_Name(),
System.Convert.ToString(MyTypeDemoClass.class.ToType().
get_IsMarshalByRef()));
Console.WriteLine("The MarshalByRef property of {0} is {1}.",
MyContextBoundClass.class.ToType().get_Name(),
System.Convert.ToString(MyContextBoundClass.class.ToType().
get_IsMarshalByRef()));
// Determine whether the types are primitive datatypes.
Console.WriteLine("Is {0} is a primitive data type? {1}.",
int.class.ToType().get_Name(),
System.Convert.ToString(int.class.ToType().get_IsPrimitive()));
Console.WriteLine("Is {0} a primitive data type? {1}.",
String.class.ToType().get_Name(),System.Convert.ToString(
String.class.ToType().get_IsPrimitive()));
}
catch (System.Exception e) {
Console.WriteLine("An exception occurred: " + e.get_Message());
}
} //main
} //MyTypeDemoClass
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0