从aspx.cs页面调用.ashx处理程序中的方法

时间:2013-07-23 13:50:07

标签: c# asp.net json web-services ashx

我在使用通用处理程序调用方法时遇到了一些麻烦。我尝试使用两种不同的技术来调用一个简单的'HelloWorld()'方法,但我得到两个不同的错误:

第一种技术如下:

        WebClient wc = new WebClient();

        NameValueCollection formData = new NameValueCollection();
        formData["method"] = "HelloWorld";


        byte[] data;

        try
        {
            data = wc.UploadValues(_domain, formData);
        }
        catch (WebException ex)
        {
            Label1.Text = ex.Message;
            return;
        }

        string response = Encoding.UTF8.GetString(data);
        Label1.Text = response;

        wc.Dispose();

我收到以下错误:

{"id":null,"error":{"name":"Found String where Object was expected."}}

我尝试的第二种技术是:

            var httpWebRequest = (HttpWebRequest)WebRequest.Create(_domain);
        httpWebRequest.ContentType = "text/json";
        httpWebRequest.Method = "POST";

        using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
        {
            string json = "{\"method\":\"helloWorld\"}"; //," +
            //"\"password\":\"bla\"}";

            streamWriter.Write(json);
            streamWriter.Flush();
            streamWriter.Close();

            try
            {
                var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
                using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                {
                    var result = streamReader.ReadToEnd();
                }
            }
            catch (WebException wex)
            {
                Label2.Text = wex.Message;
            }
            catch (Exception ex)
            {
                Label2.Text = ex.Message;
            }
        }

由此,我收到以下错误:

The remote server returned an error: (500) Internal Server Error.

当我从“.ashx?test”页面测试调用时,该方法运行,屏幕底部的详细信息为:

Pragma: no-cache
Date: Tue, 23 Jul 2013 13:46:19 GMT
Server: ASP.NET Development Server/11.0.0.0
X-AspNet-Version: 2.0.50727
Content-Type: application/json; charset=utf-8
Cache-Control: no-cache
Connection: Close
Content-Length: 32
Expires: -1

关于为什么这不起作用的任何想法?

谢谢!

1 个答案:

答案 0 :(得分:4)

ASHX处理程序不是Web服务。您不在ASXH处理程序中调用方法。您只需调用处理程序,它就可以直接传递数据,无论是文本数据还是二进制数据 - 这取决于您。