如何使用HttpWebRequest来使用WebService [英] How to Consume WebService Using HttpWebRequest

问题描述

大家好，



我是新手通过HttpWebRequest使用Web服务。所以我创建了一个用于学习目的的虚拟应用程序。我的问题可能很愚蠢但是答案我将不胜感激。



我创建了一个演示网络服务，下面是代码

 [WebMethod ] 
  public  DataSet GetEmployees（）
 {
 SqlConnection con =  new  SqlConnection（WebConfigurationManager.ConnectionStrings [  FAST]。ConnectionString）; 
 SqlCommand cmd =  new  SqlCommand（  select *来自员工，con）; 
 SqlDataAdapter da =  new  SqlDataAdapter（cmd）; 
 DataSet ds =  new  DataSet（）; 
 da.Fill（ds）; 
  return  ds; 
} 

这里我返回DataSet，我想在我的客户端应用程序中将它绑定在GridView中。

以下是客户应用程序代码

  string  url =   http：// localhost：2018 / EmployeeService.asmx; 
 HttpWebRequest webreq =（HttpWebRequest）WebRequest.Create（url）; 
 webreq.ContentType =   text / xml; charset = utf-8; 
  //   webreq.Accept =text / xml;  
 webreq。 Headers.Clear（）; 
 webreq.Method =   POST; 
编码encode = Encoding.GetEncoding（  utf-8）; 
 HttpWebResponse webres =  null ; 
 webres =（HttpWebResponse）webreq.GetResponse（）; 
流阅读器=  null ; 
 reader = webres.GetResponseStream（）; 
 StreamReader sreader =  new  StreamReader（reader，encode， true ）; 
  string  result = sreader.ReadToEnd（）; 

运行时我收到错误远程服务器返回错误：（500）内部服务器错误。在此行中，webres =（HttpWebResponse）webreq.GetResponse（）;



任何人都知道我错在哪里。

解决方案

我认为你还需要在网址中传递方法名称。 ..

这里是一个样本

使用HttpWebRequest / HttpWebResponse对象的简单和通用Web服务代理 [ ^ ]



您的网址应为

  string  url =   http：// localhost：2018 / EmployeeService的.asmx /装getEmployees; 

Hi Everyone,

I am new to consume a Web service through HttpWebRequest.So i create a dummy application for learning purpose.My question may be silly but answers would be appreciated.

I have created a demo web service, Below is the code

[WebMethod]
        public DataSet GetEmployees()
        {
            SqlConnection con = new SqlConnection(WebConfigurationManager.ConnectionStrings["FAST"].ConnectionString);
            SqlCommand cmd = new SqlCommand("select * from Employee", con);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            return ds;
        }

Here i am returning DataSet and i want to bind it in GridView in my client Application.
The Below are the Client application code

string url = "http://localhost:2018/EmployeeService.asmx";
            HttpWebRequest webreq = (HttpWebRequest)WebRequest.Create(url);
            webreq.ContentType = "text/xml; charset=utf-8";
            //webreq.Accept = "text/xml";
            webreq.Headers.Clear();
            webreq.Method = "POST";
            Encoding encode = Encoding.GetEncoding("utf-8");
            HttpWebResponse webres = null;
            webres = (HttpWebResponse)webreq.GetResponse();
            Stream reader = null;
            reader = webres.GetResponseStream();
            StreamReader sreader = new StreamReader(reader, encode, true);
            string result = sreader.ReadToEnd();

While running i am getting error "The remote server returned an error: (500) Internal Server Error." in this line, webres = (HttpWebResponse)webreq.GetResponse();

Anyone have any idea where i did mistake.

解决方案

I think you need to pass the method name also in the url ...
here is a sample
Simple And Generic Web Service Proxy Using HttpWebRequest/HttpWebResponse objects [^]

Your URL should be

string url = "http://localhost:2018/EmployeeService.asmx/GetEmployees";

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