Type.IsContextful 属性

public:
 property bool IsContextful { bool get(); };

public bool IsContextful { get; }

member this.IsContextful : bool

Public ReadOnly Property IsContextful As Boolean

属性值

true 如果可以在上下文中托管， Type 则为 ;否则为 false。

实现

示例

以下示例演示IsContextful类的 IsMarshalByRef 、IsPrimitive属性和Type属性。 它会检查给定类型是否可以托管在上下文中、是否可以按引用封送，以及该类型是否为基元数据类型。

using System;
using System.Runtime.Remoting.Contexts;

public class ContextBoundClass: ContextBoundObject
{
    public string Value = "The Value property.";
}

public class Example
{
    public static void Main()
    {
         // Determine whether the types can be hosted in a Context.
         Console.WriteLine("The IsContextful property for the {0} type is {1}.",
                           typeof(Example).Name, typeof(Example).IsContextful);
         Console.WriteLine("The IsContextful property for the {0} type is {1}.",
                           typeof(ContextBoundClass).Name, typeof(ContextBoundClass).IsContextful);

         // Determine whether the types are marshalled by reference.
         Console.WriteLine("The IsMarshalByRef property of {0} is {1}.",
                           typeof(Example).Name, typeof(Example).IsMarshalByRef);
         Console.WriteLine("The IsMarshalByRef property of {0} is {1}.",
                           typeof(ContextBoundClass).Name, typeof(ContextBoundClass).IsMarshalByRef);

         // Determine whether the types are primitive datatypes.
         Console.WriteLine("{0} is a primitive data type: {1}.",
                           typeof(int).Name, typeof(int).IsPrimitive);
         Console.WriteLine("{0} is a primitive data type: {1}.",
                           typeof(string).Name, typeof(string).IsPrimitive);
    }
}
// The example displays the following output:
//    The IsContextful property for the Example type is False.
//    The IsContextful property for the ContextBoundClass type is True.
//    The IsMarshalByRef property of Example is False.
//    The IsMarshalByRef property of ContextBoundClass is True.
//    Int32 is a primitive data type: True.
//    String is a primitive data type: False.

open System

type ContextBoundClass() as this =
    inherit ContextBoundObject()
    [<DefaultValue>]
    val mutable public Value : string 
    do 
        this.Value <- "The Value property."

type Example() = class end

// Determine whether the types can be hosted in a Context.
printfn $"The IsContextful property for the {typeof<Example>.Name} type is {typeof<Example>.IsContextful}."
printfn $"The IsContextful property for the {typeof<ContextBoundClass>.Name} type is {typeof<ContextBoundClass>.IsContextful}."

// Determine whether the types are marshalled by reference.
printfn $"The IsMarshalByRef property of {typeof<Example>.Name} is {typeof<Example>.IsMarshalByRef}."
printfn $"The IsMarshalByRef property of {typeof<ContextBoundClass>.Name} is {typeof<ContextBoundClass>.IsMarshalByRef}."

// Determine whether the types are primitive datatypes.
printfn $"{typeof<int>.Name} is a primitive data type: {typeof<int>.IsPrimitive}."
printfn $"{typeof<string>.Name} is a primitive data type: {typeof<string>.IsPrimitive}."
// The example displays the following output:
//    The IsContextful property for the Example type is False.
//    The IsContextful property for the ContextBoundClass type is True.
//    The IsMarshalByRef property of Example is False.
//    The IsMarshalByRef property of ContextBoundClass is True.
//    Int32 is a primitive data type: True.
//    String is a primitive data type: False.

Imports System.Runtime.Remoting.Contexts

Public Class ContextBoundClass : Inherits ContextBoundObject
    Public Value As String = "The Value property."
End Class

Public Class Example
    Public Shared Sub Main()
         ' Determine whether the types can be hosted in a Context.
         Console.WriteLine("The IsContextful property for the {0} type is {1}.",
                           GetType(Example).Name, GetType(Example).IsContextful)
         Console.WriteLine("The IsContextful property for the {0} type is {1}.",
                           GetType(ContextBoundClass).Name, GetType(ContextBoundClass).IsContextful)
         ' Determine whether the types are marshalled by reference.
         Console.WriteLine("The IsMarshalByRef property of {0} is {1}.",
                           GetType(Example).Name, GetType(Example).IsMarshalByRef)
         Console.WriteLine("The IsMarshalByRef property of {0} is {1}.",
                           GetType(ContextBoundClass).Name, GetType(ContextBoundClass).IsMarshalByRef)
         ' Determine whether the types are primitive datatypes.
         Console.WriteLine("{0} is a primitive data type: {1}.",
                           GetType(Integer).Name, GetType(Integer).IsPrimitive)
         Console.WriteLine("{0} is a primitive data type: {1}.",
                           GetType(String).Name, GetType(String).IsPrimitive)
    End Sub
End Class
' The example displays the following output:
'    The IsContextful property for the Example type is False.
'    The IsContextful property for the ContextBoundClass type is True.
'    The IsMarshalByRef property of Example is False.
'    The IsMarshalByRef property of ContextBoundClass is True.
'    Int32 is a primitive data type: True.
'    String is a primitive data type: False.

注解

上下文会截获对类成员的调用，并强制实施应用于类的策略，例如同步。 有关远程处理上下文的更多详细信息，请参阅 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。

另请参阅

• IsContextfulImpl()