使用webclient的Post方法

它获取一个错误api密钥名不正确。传递的所有参数都是正确的。但是，我认为我传递参数的方式是错误的。请提出解决办法

        StringBuilder postData = new StringBuilder();
        postData.AppendFormat("{0}={1}", "apikey" ,"ETG123");
        postData.AppendFormat("{0}={1}", "deviceid" ,"12");
        postData.AppendFormat("{0}={1}", "name" ,"arun");
        postData.AppendFormat("{0}={1}", "email","arun.yva9@gmail.com");
        postData.AppendFormat("{0}={1}", "dob", "10-10-1990");
        postData.AppendFormat("{0}={1}", "mobileno", "9848022338");
        postData.AppendFormat("{0}={1}", "country", "India");
        postData.AppendFormat("{0}={1}", "companyname", "etg");
        postData.AppendFormat("{0}={1}", "city", "hyderabad");
        WebClient wc = new WebClient();
        wc.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
        wc.UploadStringAsync(new Uri("http://192.168.0.149/redington/Services/register_user", UriKind.Absolute), "POST",postData.Tostring());
        wc.UploadStringCompleted += new UploadStringCompletedEventHandler(wc1_UploadStringCompleted);

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使用“&”来添加参数，而不是附加参数

string postData = string.Empty;
postData += "&apikey=ETG123";
postData +="&deviceid=12";

希望这对你有帮助