Question

我试图打开与服务器的连接并获取响应正文，这是一个图像。我想将其保存到Image，然后将其显示在PictureBox中。这是我的代码：

try
    {
        var response = WebRequest.Create(String.Format(url + "?t=webwx&_={0}", timestamp));
        var stream = response.GetRequestStream();
        Image image = Image.FromStream(stream);
        qe_img.Image = image;
        qe_img.Height = image.Height;
        qe_img.Width = image.Width;
     } catch (Exception e)
     {
        Console.WriteLine(e);
     }

我明白了：

Exception thrown: 'System.Net.ProtocolViolationException' in System.dll
System.Net.ProtocolViolationException: Cannot send a content-body with this verb-type.
   at System.Net.HttpWebRequest.CheckProtocol(Boolean onRequestStream)
   at System.Net.HttpWebRequest.GetRequestStream(TransportContext& context)
   at System.Net.HttpWebRequest.GetRequestStream()
   at WindowsFormsApplication1.Form1.showQRImage() in c:\users\morgan\documents\visual studio 2015\Projects\WindowsFormsApplication1\WindowsFormsApplication1\Form1.cs:line 70

但我总是得到WebException。我是C＃的新手，我想知道这里有什么问题。感谢。

Answer 1

试试这个

 try
            {
                var request = WebRequest.Create(String.Format(url + "?t=webwx&_={0}", timestamp));

                using (WebResponse response = request.GetResponse())
                {
                    using (Stream stream = response.GetResponseStream())
                    {
                        Image image = Image.FromStream(stream);
                        qe_img.Image = image;
                        qe_img.Height = image.Height;
                        qe_img.Width = image.Width;


                    }
                }

            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }

C＃读取流获取WebException

1 个答案: