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来自本地WCF服务的HttpWebRequest

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我正在使用简单的本地WCF服务对Xamarin Android应用程序进行一些测试，以证明我的连接代码有效 .

服务：[OperationContract] string Ping（）; ... public string Ping（）{return“Pong”; }

Xamarin App中的测试代码：

var request = HttpWebRequest.Create(string.Format(@"http://192.168.1.175/_Services/TestService1.svc/Ping"));

request.Credentials = CredentialCache.DefaultCredentials;
request.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
request.ContentLength = 0; //pass.Length;
request.Method = "POST";

using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)  //Errors out here
{
  using (StreamReader reader = new StreamReader(response.GetResponseStream()))
  {
    var content = reader.ReadToEnd();
    Console.Out.WriteLine("Response Body: \r\n {0}", content);
  }
}

错误：

远程服务器返回错误：（400）错误请求 .

编辑：

使用ServiceReference时，以下工作：

private void button3_Click（object sender，EventArgs e）{ServiceReference1.TestService1Client client = new ServiceReference1.TestService1Client（）;

string returnString;

        returnString = client.Ping();
        label1.Text = returnString;
    }

稍微不同的代码仍然不起作用：private void button4_Click（object sender，EventArgs e）{// string serviceUrl =“_ http://192.168.1.175/_Services/TestService1.svc "; string serviceUrl = " http://localhost/_Services/TestService1.svc”;

HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(new Uri(serviceUrl + "/Ping"));
        httpRequest.Accept = "text/xml";
        httpRequest.ContentType = "text/xml";
        httpRequest.Method = "POST";
        httpRequest.ContentLength = 0;
        httpRequest.KeepAlive = false;

        using (HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse()) //400 Bad Request
        {
            using (Stream stream = httpResponse.GetResponseStream())
            {
                label1.Text = (new StreamReader(stream)).ReadToEnd();
            }
        }
    }
c# httpwebrequest

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