Silverlight + WCF 服务

Question

我尝试在 Visual Studio 2010 中创建 WCF 服务，它似乎可以工作，因为当我使用 WCF 测试客户端调试 VS 时，我可以连接到该服务并运行命令。但是，当我尝试从我的 Silverlight 应用程序运行命令时，我收到一条错误消息，提示我的跨域不起作用。我已经包含了我的 silverlight 应用程序和 wcf 客户端中的代码。

服务

clientaccesspolicy.xml

`<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="SOAPAction">
        <domain uri="*"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true"/>
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>`

app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

  <system.web>
    <compilation debug="true" />
  </system.web>
  <!-- When deploying the service library project, the content of the config file must be added to the host's 
  app.config file. System.Configuration does not support config files for libraries. -->
  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="SqlServerServiceBinding" maxBufferPoolSize="2147483647"
                 maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
          <readerQuotas  maxDepth="2147483647" maxStringContentLength="2147483647" maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxNameTableCharCount="2147483647" />
        </binding>
      </basicHttpBinding>
    </bindings>

    <!--<behaviors>
      <serviceBehaviors>
        <behavior name="SqlServerServiceBehavior">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>-->

    <services>
      <service name="SqlServerService.Service1">
        <host>
          <baseAddresses>
            <add baseAddress = "http://localhost:8085/" />
          </baseAddresses>
        </host>
        <!-- Service Endpoints -->
        <!-- Unless fully qualified, address is relative to base address supplied above -->
        <endpoint address ="" binding="basicHttpBinding" contract="SqlServerService.IService1">
          <!-- 
              Upon deployment, the following identity element should be removed or replaced to reflect the 
              identity under which the deployed service runs.  If removed, WCF will infer an appropriate identity 
              automatically.
          -->
          <!--<identity>
            <dns value="localhost"/>
          </identity>-->
        </endpoint>
        <!-- Metadata Endpoints -->
        <!-- The Metadata Exchange endpoint is used by the service to describe itself to clients. --> 
        <!-- This endpoint does not use a secure binding and should be secured or removed before deployment -->
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, 
          set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="True"/>
          <!-- To receive exception details in faults for debugging purposes, 
          set the value below to true.  Set to false before deployment 
          to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>

</configuration>

service1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace SqlServerService
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in both code and config file together.
    public class Service1 : IService1
    {
        public CompositeType executeScriptWithReturn(String command_string)
        { 
            CompositeType cs = new CompositeType();
            Userful_Commands.sql_server_commands sql = new Userful_Commands.sql_server_commands("Server=localhost;Database=kenticoTest;Integrated Security=SSPI;");

            cs.DtValue = command_string;//sql.executeScriptWithReturn("SELECT * FROM tblBugs");
            return cs;
        }
    }
}

IService1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace SqlServerService
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
    [ServiceContract]
    public interface IService1
    {
        [OperationContract]
        CompositeType executeScriptWithReturn(String command_string);

        // TODO: Add your service operations here
    }

    // Use a data contract as illustrated in the sample below to add composite types to service operations
    [DataContract]
    public class CompositeType
    {
        public String dt;

        [DataMember]
        public String DtValue
        {
            get { return dt; }
            set { dt = value; }
        }
    }
}

银光

ServicesReferences.ClientConfig

<configuration>
  <system.serviceModel>
    <bindings>
      <basicHttpBinding>
        <binding name="BasicHttpBinding_IService1" maxBufferSize="2147483647"
          maxReceivedMessageSize="2147483647">
          <security mode="None" />
        </binding>
      </basicHttpBinding>
    </bindings>
    <client>
      <endpoint address="http://localhost:8085/" binding="basicHttpBinding"
        bindingConfiguration="BasicHttpBinding_IService1" contract="ServiceReference1.IService1"
        name="BasicHttpBinding_IService1" />
    </client>
  </system.serviceModel>
</configuration>

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Silverlight;
using SilverlightSQLServer;

namespace SilverlightApplication1
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void loaded_up(object sender, RoutedEventArgs e)
        {
            //SilverlightApplication1.ServiceReference1.Service1Client sc = new ServiceReference1.Service1Client();
            //sc.executeScriptWithReturnCompleted += completed;
            //sc.executeScriptWithReturnAsync("TEST COMMAND");
            ServiceReference1.Service1Client ws = new ServiceReference1.Service1Client();

            ws.executeScriptWithReturnCompleted += completed;
            ws.executeScriptWithReturnAsync("TESTCOMMAND");
        }

        private void completed(object sender, SilverlightApplication1.ServiceReference1.executeScriptWithReturnCompletedEventArgs e)
        {
            SilverlightApplication1.ServiceReference1.CompositeType serviceResp = e.Result;
            e = e;

        }
    }
}

提前谢谢你。

Answer 1

我自己也曾为此苦苦挣扎。我发现的最简单的解决方案是将 WCF 服务放在托管您的 silverlight 应用程序的解决方案中。右键单击该项目（具有 ClientBin 文件夹的 .Web 项目）选择添加项目并选择 WCF 服务。将您的代码放入该服务中，您的跨域问题就会消失。当然，如果您想在其他地方托管服务，那么这对您没有帮助。