Silverlight-获取网络数据源的几种方式

1跨域验证

<? 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与数据源连接

1 SOAP services

 

服务端

新建一个asmx 得到

 

[WebService(Namespace  =   " http://xxxx.net/ " )]
   [WebServiceBinding(ConformsTo  =  WsiProfiles.BasicProfile1_1)]
   [System.ComponentModel.ToolboxItem( false )]
    public   class  SampleAsmx : System.Web.Services.WebService
   {

       [WebMethod]
        public   string  GetCoolText( int  number)
       {
            switch  (number)
           {
                case   0 :  return   " zero " ;
                case   1 :  return   " one " ;     

                default :  return   " unknown " ;

           }

       }

 

客户端

private   void  GetString_Click( object  sender, RoutedEventArgs e) {
          Binding myBinding  =   new  BasicHttpBinding();
          EndpointAddress myEndpoint  =   new
            EndpointAddress( " http://localhost:55905/SampleAsmx.asmx " );

          SilverService.SampleAsmxSoapClient proxy  =   new
            SilverService.SampleAsmxSoapClient(myBinding, myEndpoint);

          proxy.GetCoolTextCompleted  +=  proxy_GetCoolTextCompleted;

          proxy.GetCoolTextAsync( 1 );
      }
       void  proxy_GetCoolTextCompleted( object  sender,
        SilverService.GetCoolTextCompletedEventArgs e) {
          Results.Text  =  e.Result;
          (sender  as  SilverService.SampleAsmxSoapClient).CloseAsync();
      }

 

客户端的config

< configuration >
     < system.serviceModel >
         < bindings >
             < basicHttpBinding >
                 < binding  name ="SampleAsmxSoap"  maxBufferSize ="2147483647"  maxReceivedMessageSize ="2147483647" >
                     < security  mode ="None"   />
                 </ binding >
             </ basicHttpBinding >
         </ bindings >
         < client >
             < endpoint  address ="http://localhost:55905/SampleAsmx.asmx"  binding ="basicHttpBinding"
                bindingConfiguration ="SampleAsmxSoap"  contract ="SilverService.SampleAsmxSoap"
                name ="SampleAsmxSoap"   />
         </ client >
     </ system.serviceModel >
</ configuration >

 

 

这里会涉及到一堆WCF 的知识。可能需要你额外去学习。

2 RESTful Sercvices

从RESTFUL的services上获取信息

private   void  GetSingleXml_Click( object  sender, RoutedEventArgs e)
{
UIThread  =  SynchronizationContext.Current;
string  rawPath
=   " http://www.silverlightinaction.com/Authors.svc/SingleXml/{0} " ;
Uri path  =   new  Uri( string .Format(rawPath, Input.Text),
UriKind.Absolute);
HttpWebRequest request  =  (HttpWebRequest)WebRequest.Create(path);
request.BeginGetResponse(SingleXmlCallBack, request);
}
private   void  SingleXmlCallBack(IAsyncResult result)
{
HttpWebRequest request  =  (HttpWebRequest)result.AsyncState;
HttpWebResponse response
=  (HttpWebResponse)request.EndGetResponse(result);
Stream responseStream  =  response.GetResponseStream();
UIThread.Post(UpdateUiText, responseStream);
}

发送信息过去

private   void  Test_Click( object  sender, RoutedEventArgs e)
{
UIThread  =  SynchronizationContext.Current;
Uri path  =   new
Uri( " http://www.silverlightinaction.com/Authors.svc/Update/Brown " ,
UriKind.Absolute);
HttpWebRequest request  =  (HttpWebRequest)WebRequest.Create(path);
request.Method  =   " POST " ;
request.ContentType  =   " application/xml " ;
request.BeginGetRequestStream(AddPayload, request);
}
private   void  AddPayload(IAsyncResult result)
{
HttpWebRequest request  =  (HttpWebRequest) result.AsyncState;
StreamWriter dataWriter  =
new  StreamWriter(request.EndGetRequestStream(result));
dataWriter.Write( " <?xml version=/ " 1.0 / " ?><Author><FirstName>Bob "   +
" </FirstName><LastName>Smith</LastName></Author> " );
dataWriter.Close();
request.BeginGetResponse(SingleJsonCallBack, request);
}
private   void  SingleJsonCallBack(IAsyncResult result)
{
HttpWebRequest request  =  (HttpWebRequest)result.AsyncState;
HttpWebResponse response  =
(HttpWebResponse)request.EndGetResponse(result);
Stream responseStream  =  response.GetResponseStream();
UIThread.Post(UpdateUiText, responseStream);
}

 

 

3HTTP方式

1手动构造

使用System.Net.Browser.WebRequestCreator 来构造。

HttpWebRequest  类

HttpWebRequest request  =
(HttpWebRequest)WebRequestCreator.ClientHttp.Create(
new  Uri( " http://api.10rem.net/Authors " ));
request.Method  =   " PUT " ;

 

 

2为特定的网站或协议自动使用client stack

如为某个网站 HTTP 和 SSL都使用 client stack 你可以这么写

为指定的 URI 注册 WebRequest 子代。

WebRequest.RegisterPrefix(
http: // www.baidu.com, WebRequestCreator.ClientHttp);
WebRequest.RegisterPrefix(
" https://www.baidu.com " , WebRequestCreator.ClientHttp);

 

 

 

 

3Authentication credentials

The client networking stack supports NTLM, basic, and digest authorization

NTLM是NT LAN Manager的缩写，这也说明了协议的来源。NTLM 是 Windows NT 早期版本的标准安全协议，Windows 2000 支持 NTLM 是为了保持向后兼容。Windows 2000内置三种基本安全协议之一。

在网络环境中，NTLM 用作身份验证协议以处理两台计算机（其中至少有一台计算机运行 Windows NT 4.0 或更早版本）之间的事务。具有此配置的网络称为“混合模式”，这是 Windows Server 2003 家族中的默认设置

参考

http://www.codeproject.com/KB/aspnet/ASPDOTNETauthentication.aspx

http://social.msdn.microsoft.com/Forums/zh-SG/sqldataaccess/thread/c60a86f0-cda5-47b4-8448-0c5730084896

实现 digest authorization

private   void  SendRequest()
{
HttpWebRequest.RegisterPrefix(
" http:// " , WebRequestCreator.ClientHttp);
HttpWebRequest req  =  (HttpWebRequest)HttpWebRequest.Create(
new  Uri( " http://XX.net " ));
req.UseDefaultCredentials  =   false ;
req.Credentials  =
new  NetworkCredential( " Pete " ,  " password " ); // 任意多参数
req.BeginGetResponse(OnRequestCompleted, req);
}
private   void  OnRequestCompleted(IAsyncResult asyncResult)
{
HttpWebRequest request  =
(HttpWebRequest)asyncResult.AsyncState;
HttpWebResponse response  =
(HttpWebResponse)request.EndGetResponse(asyncResult);
................

}

 

4使用cookies

 

private   void  SendRequest()
{
WebRequest.RegisterPrefix(
" http:// " , WebRequestCreator.ClientHttp);
WebRequest.RegisterPrefix(
" https:// " , WebRequestCreator.ClientHttp);


HttpWebRequest req  =  (HttpWebRequest)HttpWebRequest.Create(
new  Uri( " http://baidu.com " ));
CookieCollection cookies  =   new  CookieCollection();
cookies.Add( new  Cookie( " firstName " ,  " Pete " ));
cookies.Add( new  Cookie( " lastName " ,  " Brown " ));
cookies.Add( new  Cookie( " lastAccess " , DateTime.Now.ToString()));
req.CookieContainer  =   new  CookieContainer();
req.CookieContainer.Add(
new  Uri( " http://baidu.com " ), cookies);
req.BeginGetResponse(OnRequestCompleted, req);
}
private   void  OnRequestCompleted(IAsyncResult asyncResult)
{
HttpWebRequest req  =
(HttpWebRequest)asyncResult.AsyncState;
HttpWebResponse response  =
(HttpWebResponse)req.EndGetResponse(asyncResult);
...
foreach  (Cookie cookie  in  response.Cookies)
{
Debug.WriteLine(cookie.Name  +   " : "   +  cookie.Value);
}
}