(C#)調用Webservice，提示遠程伺服器返回錯誤(500)內部伺服器錯誤

 因為工作需要調用WebService介面，查了下資料，發現添加服務引用可以直接調用websevice

參考地址：https://www.cnblogs.com/peterpc/p/4628441.html

如果不添加服務引用又怎麼做呢？於是又去查看怎麼根據http協議調用webservice並做了個無參介面測試，如下：

但一做有參的介面調用就提示500錯誤（遠程伺服器返回錯誤(500)內部伺服器錯誤），查了半天資料，大多數都說是ContentType = "application/x-www-form-urlencoded; charset=UTF-8"; 改成ContentType = "text/html";或者在<@Page..%>中設置 ValidateRequest="false" 即可（這裡無需修改Content-type）。結果還是報一樣的錯誤。最後再https://www.jb51.net/article/120015.htm中發現參數是要拼接一下的 (param = HttpUtility.UrlEncode("param1") + "=" + HttpUtility.UrlEncode(num1) + "&" + HttpUtility.UrlEncode("param2") + "=" + HttpUtility.UrlEncode(num2);) ,這樣傳遞int、string類型的參數都沒問題。業務要求傳遞的是圖片二進位轉化的string類型數據，結果還是報500錯誤。經過調試對比發現圖片二進位數據轉化成的string類型數據沒有根據url形式傳遞，而是帶有特殊符號的，知道問題所在就好辦了，把它轉化成有效的url傳輸數據就行,.net也有現成的封裝方法：HttpServerUtility.UrlTokenEncode(bmpBytes)，這樣500錯誤也解決了。

測試代碼如下：

 1   protected void Page_Load(object sender, EventArgs e)
 2         {
 3             Bitmap bmp = new Bitmap(System.Drawing.Image.FromFile("C:/Users/TYTD/Desktop/測試樣本/ch_DJI_279.jpg"));
 4             MemoryStream ms = new MemoryStream();
 5             bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
 6             ms.Flush();
 7             //將二進位數據存到byte數組中
 8             byte[] bmpBytes1 = ms.ToArray();
 9             bmp.Dispose();
10 
11             string bmpBytes = HttpUtility.UrlEncode("bmpBytes") + "=" + HttpServerUtility.UrlTokenEncode(bmpBytes1);
12 
13             string url = "http://192.168.0.28:9800/WebService1.asmx/Send_Image";
14             string a = CallServiceByGet1(url, bmpBytes);
15 
16         }
17         public static string CallServiceByGet1(string strURL,string a)
18         {
19             var result = string.Empty;
20             //創建一個HTTP請求
21             byte[] byt = Encoding.UTF8.GetBytes(a);
22             HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strURL);
23             request.Method = "POST";
24             request.ContentType = "application/x-www-form-urlencoded";
25             request.ContentLength = byt.Length;
26            
27             request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)";
28             System.IO.Stream outputStream = request.GetRequestStream();
29             outputStream.Write(byt, 0, byt.Length);
30             outputStream.Close();
31 
32             HttpWebResponse response;
33             Stream responseStream;
34             StreamReader reader;
35             string srcString;
36             try
37             {
38                 response = (HttpWebResponse)request.GetResponse();//獲取http請求的響應對象
39             }
40             catch (WebException ex)
41             {
42                 return ex.Message;
43             }
44             responseStream = response.GetResponseStream();
45             reader = new System.IO.StreamReader(responseStream, Encoding.GetEncoding("UTF-8"));
46             srcString = reader.ReadToEnd();
47             result = srcString;   //返回值賦值
48             reader.Close();
49 
50             return result;
51         }