UrlAttribute 类

定义

定义可在调用站点上用于指定将发生激活的 URL 的特性。 此类不能被继承。

public ref class UrlAttribute sealed : System::Runtime::Remoting::Contexts::ContextAttribute
[System.Serializable]
public sealed class UrlAttribute : System.Runtime.Remoting.Contexts.ContextAttribute
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class UrlAttribute : System.Runtime.Remoting.Contexts.ContextAttribute
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
[System.Security.SecurityCritical]
public sealed class UrlAttribute : System.Runtime.Remoting.Contexts.ContextAttribute
[<System.Serializable>]
type UrlAttribute = class
    inherit ContextAttribute
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type UrlAttribute = class
    inherit ContextAttribute
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
[<System.Security.SecurityCritical>]
type UrlAttribute = class
    inherit ContextAttribute
Public NotInheritable Class UrlAttribute
Inherits ContextAttribute
继承
属性

示例

下面的代码示例演示了在设置客户端激活远程处理时使用 UrlAttribute 。 该示例包含三个部分:客户端、服务器以及客户端和服务器使用的远程对象。

以下代码示例演示客户端:

#using <System.Runtime.Remoting.dll>
#using <System.dll>
#using "RemoteObject.dll"

using namespace System;
using namespace System::Runtime::Remoting;
using namespace System::Runtime::Remoting::Activation;
using namespace System::Runtime::Remoting::Channels;
using namespace System::Runtime::Remoting::Channels::Tcp;

[STAThread]
int main()
{
   
   // Report initial status.
   Console::WriteLine( "Client starting." );
   
   // Register TCP channel.
   ChannelServices::RegisterChannel( gcnew TcpChannel );
   
   // Create UrlAttribute.
   UrlAttribute^ attribute = gcnew UrlAttribute( "tcp://localhost:1234/RemoteApp" );
   Console::WriteLine( "UrlAttribute value: {0}", attribute->UrlValue );
   
   array<Object^>^activationAttributes = {attribute};
   
   // Use UrlAttribute to register for client activated remote object.
   RemotingConfiguration::RegisterActivatedClientType( RemoteObject::typeid, "tcp://localhost:1234/RemoteApp" );
   
   // Activate remote object.
   Console::WriteLine( "Activating remote object." );
   RemoteObject ^ obj = dynamic_cast<RemoteObject^>(Activator::CreateInstance( RemoteObject::typeid, nullptr, activationAttributes ));
   
   // Invoke a method on it.
   Console::WriteLine( "Invoking Hello() on remote object." );
   obj->Hello();
   
   // Inform user of termination.
   Console::WriteLine( "Terminating client." );
}
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Activation;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

public class Client
{
    [STAThread]
    public static void Main()
    {
        // Report the initial status.
        Console.WriteLine("Starting client.");

        // Register the TCP channel.
        ChannelServices.RegisterChannel(new TcpChannel());

        // Create a url attribute object.
        UrlAttribute attribute =
            new UrlAttribute("tcp://localhost:1234/RemoteApp");
        Console.WriteLine("UrlAttribute value: {0}", attribute.UrlValue);
        object[] activationAttributes = new object[] { attribute };

        // Register the client for the remote object.
        RemotingConfiguration.RegisterActivatedClientType(
            typeof(RemoteObject),
            "tcp://localhost:1234/RemoteApp");

        // Activate the remote object.
        Console.WriteLine("Activating remote object.");
        RemoteObject obj = (RemoteObject) Activator.CreateInstance(
            typeof(RemoteObject), null, activationAttributes);

        // Invoke a method on the remote object.
        Console.WriteLine("Invoking Hello() on remote object.");
        obj.Hello();

        // Inform the user that the program is exiting.
        Console.WriteLine("The client is exiting.");
    }
}

下面的代码示例演示此客户端的服务器:

#using <System.Runtime.Remoting.dll>
#using <System.dll>
#using "RemoteObject.dll"

using namespace System;
using namespace System::Runtime::Remoting;
using namespace System::Runtime::Remoting::Channels;
using namespace System::Runtime::Remoting::Channels::Tcp;

[STAThread]
int main()
{
   
   // Report status to user.
   Console::WriteLine( "Server starting." );
   
   // Register the TCP channel.
   ChannelServices::RegisterChannel( gcnew TcpChannel( 1234 ) );
   
   // Set application name.
   RemotingConfiguration::ApplicationName = "RemoteApp";
   
   // Register object for client activated remoting.
   RemotingConfiguration::RegisterActivatedServiceType( RemoteObject::typeid );
   
   // Wait until termination.
   Console::WriteLine( "Press enter to end." );
   Console::ReadLine();
   Console::WriteLine( "Terminating server." );
}
using System;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;

public class Server
{
    [STAThread]
    public static void Main()
    {
        // Report the status to the user.
        Console.WriteLine("Starting server.");

        // Register the TCP channel.
        ChannelServices.RegisterChannel(new TcpChannel(1234));

        // Set the application name.
        RemotingConfiguration.ApplicationName = "RemoteApp";

        // Register the object for remoting.
        RemotingConfiguration.RegisterActivatedServiceType(
            typeof(RemoteObject));

        // Wait until the user presses ENTER.
        Console.WriteLine("Press ENTER to exit.");
        Console.ReadLine();
        Console.WriteLine("The server is exiting.");
    }
}

下面的代码示例演示客户端和服务器使用的远程对象:

using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;

[assembly:AllowPartiallyTrustedCallersAttribute];
public ref class RemoteObject: public MarshalByRefObject
{
public:
   RemoteObject()
   {
      
      // Report object construction to server's console.
      Console::WriteLine( "You have called the constructor." );
   }

   void Hello()
   {
      
      // Report method invocation to server's console.
      Console::WriteLine( "You have called Hello()." );
   }

};
using System;
using System.Security;
using System.Security.Permissions;

public class RemoteObject : MarshalByRefObject
{
    public RemoteObject()
    {
        Console.WriteLine("You have called the constructor.");
    }

    public void Hello()
    {
        Console.WriteLine("You have called Hello().");
    }
}

注解

使用该方法创建激活对象时,该 UrlAttribute 数组作为参数 Activator.CreateInstance 传入激活 CreateInstance 属性数组。

有关使用属性的详细信息,请参阅 “属性”。

构造函数

UrlAttribute(String)

创建 UrlAttribute 类的新实例。

字段

AttributeName

此 API 支持产品基础结构,不能在代码中直接使用。

指示上下文特性的名称。

(继承自 ContextAttribute)

属性

Name

此 API 支持产品基础结构,不能在代码中直接使用。

获取上下文特性的名称。

(继承自 ContextAttribute)
TypeId

在派生类中实现时,获取此 Attribute 的唯一标识符。

(继承自 Attribute)
UrlValue

获取 UrlAttribute 的 URL 值。

方法

Equals(Object)

检查指定对象是否与当前实例引用相同的 URL。

Freeze(Context)

此 API 支持产品基础结构,不能在代码中直接使用。

当上下文冻结时调用。

(继承自 ContextAttribute)
GetHashCode()

返回当前 UrlAttribute 的哈希值。

GetPropertiesForNewContext(IConstructionCallMessage)

强制在指定 URL 处的上下文内创建上下文和服务器对象。

GetType()

获取当前实例的 Type

(继承自 Object)
IsContextOK(Context, IConstructionCallMessage)

返回一个布尔值,该值指示指定的 Context 是否满足 UrlAttribute 的要求。

IsDefaultAttribute()

在派生类中重写时,指示此实例的值是否是派生类的默认值。

(继承自 Attribute)
IsNewContextOK(Context)

此 API 支持产品基础结构,不能在代码中直接使用。

返回一个指示上下文属性是否与新上下文兼容的布尔值。

(继承自 ContextAttribute)
Match(Object)

当在派生类中重写时,返回一个指示此实例是否等于指定对象的值。

(继承自 Attribute)
MemberwiseClone()

创建当前 Object 的浅表副本。

(继承自 Object)
ToString()

返回表示当前对象的字符串。

(继承自 Object)

显式接口实现

_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

将一组名称映射为对应的一组调度标识符。

(继承自 Attribute)
_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

检索对象的类型信息,然后可以使用该信息获取接口的类型信息。

(继承自 Attribute)
_Attribute.GetTypeInfoCount(UInt32)

检索对象提供的类型信息接口的数量(0 或 1)。

(继承自 Attribute)
_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

提供对某一对象公开的属性和方法的访问。

(继承自 Attribute)

适用于

另请参阅