Silverlight 调用自托管的wcf 报跨域异常的处理

  Sileverlight很多时候需要通过wcf和后台,程序进行交互。如果 iis was托管还好,极端的遇到自托管的程序,console,windowsservice,winform,wpf等,就会出现跨域问题。网上很多解决方式。俺在以下博文基础上又总结了点。

  以下博文可以先学习下:

    http://blog.csdn.net/boyhxy/article/details/5224112

    http://blog.sina.com.cn/s/blog_74066ace0100vhs5.html

    http://www.cnblogs.com/lxblog/archive/2012/08/02/2620393.html


以下是个人总结

     1.此解决方案与Silverlight版本无关。

     2.可以跨进程托管Domain

     3.可以不写配置文件托管Domain和Service

     4.可以用 Stream和Message当Domain返回值

     5.不通过配置实现的自托管代码如下:


跨域解决方案

     方案1:

  1.在项目中加入clientaccesspolicy.xml,编译生成内容,复制=true

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

      2. 加入域提供类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.ServiceModel.Activation;
using System.ServiceModel.Channels;
using System.Xml;
namespace TEST
{
public class DomainService : IDomainService
{
public System.ServiceModel.Channels.Message ProvidePolicyFile()
{
XmlReader reader = XmlReader.Create("clientaccesspolicy.xml");
System.ServiceModel.Channels.Message result = Message.CreateMessage(MessageVersion.None, "", reader);
return result;
} } [ServiceContract] public interface IDomainService
{
[OperationContract]
[WebGet(UriTemplate = "/clientaccesspolicy.xml")]
System.ServiceModel.Channels.Message ProvidePolicyFile();
}
}

     3.自托管 启动跨域访问

           //启动跨域访问
ServiceHost crossDomainserviceHost = new ServiceHost(typeof(DomainService));
crossDomainserviceHost.AddServiceEndpoint(typeof(IDomainService), new WebHttpBinding()
, "http://127.0.0.1:4514/"); crossDomainserviceHost.Description.Endpoints[].Behaviors.Add(new WebHttpBehavior());
crossDomainserviceHost.Open();

注:

            优点:跨域访问的返回文件类型是:Content-Type: application/xml 。IE,Chrome都测试过,都可以使用。

            缺点:客户端过多可能对造成过多的IO请求,需要做多客户端压力测试。


  方案2:

   1.在项目中加入clientaccesspolicy.xml,编译生成嵌入资源

    2.加入域提供类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.ServiceModel.Activation;
using System.ServiceModel.Channels;
using System.Xml;
namespace Test
{
public class DomainService : IDomainService
{
public Stream ProvidePolicyFile()
{ var policyfile = "Test.clientaccesspolicy.xml";
Stream result= Assembly.GetExecutingAssembly().GetManifestResourceStream(policyfile);

return result;
}
} [ServiceContract] public interface IDomainService
{
[OperationContract]
[WebGet(UriTemplate = "/clientaccesspolicy.xml")]
Stream ProvidePolicyFile(); }
}

     3.自托管 启动跨域访问

 注:

            优点:没有过多的IO请求。

            缺点:跨域访问的返回文件类型是:Content-Type: application/octet-stream 。IE可用,Chrome不可用。


     方案3:

         1.加入域提供类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.ServiceModel.Activation;
using System.ServiceModel.Channels;
using System.Xml;
namespace TEST
{
public class DomainService : IDomainService
{
public Stream ProvidePolicyFile()
{
string clientAccessPolicy = "<?xml version=\"1.0\" encoding=\"utf-8\"?> <access-policy><cross-domain-access><policy><allow-from http-request-headers=\"*\"><domain uri=\"*\"/></allow-from><grant-to><resource path=\"/\" include-subpaths=\"true\"/></grant-to> </policy></cross-domain-access></access-policy>";
return StringToStream(clientAccessPolicy);
} private Stream StringToStream(string result)
{
WebOperationContext.Current.OutgoingResponse.ContentType = "application/xml"; return new MemoryStream(Encoding.UTF8.GetBytes(result));
} } [ServiceContract] public interface IDomainService
{
[OperationContract]
[WebGet(UriTemplate = "/clientaccesspolicy.xml")]
Stream ProvidePolicyFile(); }
}

     3.自托管 启动跨域访问

 注:

            优点:没有过多的IO请求。跨域访问的返回文件类型是Content-Type: application/xml。IE,Chrome可用

            缺点:指定了编码方式,可能带来局限性。

   


总结:

              方案3,1一般情况均较好。个人喜欢第3种。


      --Domain--
  ServiceHost crossDomainserviceHost = new ServiceHost(typeof(DomainService));
  crossDomainserviceHost.AddServiceEndpoint(typeof(IDomainService), new WebHttpBinding()
     , "http://localhost:9090/");

  crossDomainserviceHost.Description.Endpoints[0].Behaviors.Add(new WebHttpBehavior());
  crossDomainserviceHost.Open();

  --Service--

  ServiceHost testHost = new ServiceHost(typeof(WCFService), new Uri("http://localhost:9090/WCFService/"));
  testHost.AddServiceEndpoint(typeof(IWCFService), new BasicHttpBinding()
    , "");

  ServiceMetadataBehavior bb = new ServiceMetadataBehavior();
  bb.HttpGetEnabled = true;
  bb.HttpGetUrl = new Uri("http://localhost:9090/WCFService/mex");
  testHost.Description.Behaviors.Add(bb);

  ServiceCredentials credential = new ServiceCredentials();
  testHost.Description.Behaviors.Add(credential);

  testHost.Open();

    注意:请用“http://localhost:9090/WCFService/mex”来寻找服务,目前水平有限,还不能直接通过代码实现和配置一样通过http://localhost:9090/WCFService/"来寻找服务。望大家知道的能回复答案。

 

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