Type.IsContextfulImpl 方法

定义

命名空间:

System

程序集:

netstandard.dll, System.Runtime.dll

Source:

Type.cs

实现 IsContextful 属性并确定 Type 在上下文中是否可以被承载。

C#

protected virtual bool IsContextfulImpl();

返回

Boolean

如果 Type 能够在某个上下文中承载，则为 true；否则为 false。

示例

以下示例演示如何使用 IsContextfulImpl 方法。

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.";
}

注解

派生类可以重写此方法。

上下文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。

适用于

另请参阅

• IsContextful