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。Defines an attribute that can be used at the call site to specify the URL where the activation will happen. 此类不能被继承。This class cannot be inherited.

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如何使用 UrlAttribute 设置客户端激活的远程处理。The following code example illustrates the use of the UrlAttribute in setting up client-activated remoting. 该示例包含三个部分:客户端、服务器和客户端和服务器使用的远程对象。The example contains three parts: a client, a server, and a remote object that is used by the client and server.

下面的代码示例演示客户端:The following code example shows a client:

#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;
using System.Security.Permissions;

public class Client
{
[SecurityPermission(SecurityAction.Demand)]
    [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了此客户端的服务器:The following code example shows a server for this client:

#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:The following code example shows the remote object that is used by the client and the server:

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

UrlAttribute Activator.CreateInstance 使用方法创建激活的对象时,将在激活特性数组中将作为参数传递给 CreateInstanceThe UrlAttribute is passed in the activation attributes array as a parameter to Activator.CreateInstance when creating activated objects with the CreateInstance method.

有关使用特性的详细信息,请参阅 特性For more information about using attributes, see Attributes.

构造函数

UrlAttribute(String)

创建 UrlAttribute 类的新实例。Creates a new instance of the UrlAttribute class.

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。Indicates the name of the context attribute.

(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。Gets the name of the context attribute.

(继承自 ContextAttribute)
TypeId

在派生类中实现时,获取此 Attribute 的唯一标识符。When implemented in a derived class, gets a unique identifier for this Attribute.

(继承自 Attribute)
UrlValue

获取 UrlAttribute 的 URL 值。Gets the URL value of the UrlAttribute.

方法

Equals(Object)

检查指定对象是否与当前实例引用相同的 URL。Checks whether the specified object refers to the same URL as the current instance.

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。Called when the context is frozen.

(继承自 ContextAttribute)
GetHashCode()

返回当前 UrlAttribute 的哈希值。Returns the hash value for the current UrlAttribute.

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。Forces the creation of the context and the server object inside the context at the specified URL.

GetType()

获取当前实例的 TypeGets the Type of the current instance.

(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。Returns a Boolean value that indicates whether the specified Context meets UrlAttribute's requirements.

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。When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.

(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。Returns a Boolean value indicating whether the context property is compatible with the new context.

(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。When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.

(继承自 Attribute)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(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。Maps a set of names to a corresponding set of dispatch identifiers.

(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。Retrieves the type information for an object, which can be used to get the type information for an interface.

(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)。Retrieves the number of type information interfaces that an object provides (either 0 or 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。Provides access to properties and methods exposed by an object.

(继承自 Attribute)

适用于

另请参阅