WebException如何用身体获得整体反应？
WebException如何用身体获得整体反应？
提问于 2012-08-06 21:02:52
在WebException中，我看不到GetResponse的主体。这是我在C#中的代码：
try {
return GetResponse(url + "." + ext.ToString(), method, headers, bodyParams);
} catch (WebException ex) {
switch (ex.Status) {
case WebExceptionStatus.ConnectFailure:
throw new ConnectionException();
case WebExceptionStatus.Timeout:
throw new RequestTimeRanOutException();
case WebExceptionStatus.NameResolutionFailure:
throw new ConnectionException();
case WebExceptionStatus.ProtocolError:
if (ex.Message == "The remote server returned an error: (401) unauthorized.") {
throw new CredentialsOrPortalException();
}
throw new ProtocolErrorExecption();
default:
throw;
}我看到了标题，但看不到正文。这是Wireshark对该请求的输出：
POST /api/1.0/authentication.json HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Accept: application/json
Host: nbm21tm1.teamlab.com
Content-Length: 49
Connection: Keep-Alive
userName=XXX&password=YYYHTTP/1.1 500 Server error
Cache-Control: private, max-age=0
Content-Length: 106
Content-Type: application/json; charset=UTF-8
Server: Microsoft-IIS/7.5
X-AspNet-Version: 2.0.50727
X-Powered-By: ASP.NET
X-Powered-By: ARR/2.5
Date: Mon, 06 Aug 2012 12:49:41 GMT
Connection: close
{"count":0,"startIndex":0,"status":1,"statusCode":500,"error":{"message":"Invalid username or password."}}有没有可能以某种方式在WebException中看到消息文本？谢谢。
回答 3
Stack Overflow用户
回答已采纳
发布于 2012-08-06 21:06:41
var resp = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();
dynamic obj = JsonConvert.DeserializeObject(resp);
var messageFromServer = obj.error.message;Stack Overflow用户
发布于 2014-01-16 14:18:43
try {
WebClient client = new WebClient();
client.Encoding = Encoding.UTF8;
string content = client.DownloadString("https://sandiegodata.atlassian.net/wiki/pages/doaddcomment.action?pageId=524365");
Console.WriteLine(content);
Console.ReadKey();
} catch (WebException ex) {
var resp = new StreamReader(ex.Response.GetResponseStream()).ReadToEnd();
Console.WriteLine(resp);
Console.ReadKey();
}Stack Overflow用户
发布于 2021-05-14 00:43:36
我看不到任何using语句的答案，也看不到async的任何用途。
public static class WebExceptionExtensions
{
public static string GetResponseBody(this WebException webException)
{
if (webException.Status == WebExceptionStatus.ProtocolError)
{
try
{
using (var stream = webException.Response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
string msg = reader.ReadToEnd();
if (string.IsNullOrEmpty(msg) && webException.Response is HttpWebResponse response)
msg = $"{response.StatusDescription} ({(int)response.StatusCode})"; // provide some error message if not found
return msg;
}
}
}
catch (WebException) // we tried
{
return string.Empty;
}
}
else
{
return string.Empty;
}
}
public static async Task<string> GetResponseBodyAsync(this WebException webException)
{
if (webException.Status == WebExceptionStatus.ProtocolError)
{
try
{
using (var stream = webException.Response.GetResponseStream())
{
using (var reader = new StreamReader(stream))
{
string msg = await reader.ReadToEndAsync();
if (string.IsNullOrEmpty(msg) && webException.Response is HttpWebResponse response)
msg = $"{response.StatusDescription} ((int){response.StatusCode})"; // provide some error message if not found
return msg;
}
}
}
catch (WebException) // we tried
{
return string.Empty;
}
}
else
{
return string.Empty;
}
}
}现在，每当我们捕获WebExceptions时，都很容易获得响应体。
try
{
// Do work here...
}
catch (WebException we)
{
Console.WriteLine(we.GetResponseBody()); // synchronous
Console.WriteLine(await we.GetResponseBodyAsync()); // or asynchronous
}
catch (Exception e)
{
throw new Exception("Unexpected error occured", e);
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/11828843
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