C# 从ajax调用WebApi时如何调试500内部服务器错误？
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How can I debug a 500 Internal Server Error when calling a WebApi from ajax?
提问by Bruce C
I am receiving a 500 Internal Server Error in a MVC 4.5 WebApi project. I can successfully call my webservice with a GET and a GET with an Id. But, when I POST a file I am getting the error. I can set a breakpoint in Application_BeginRequest()and confirm that I am receiving first an OPTIONS request and then the POST. The method in the controller is not getting called and I have added an Application_Error()method to Global.asax.cs that does not get hit either. The html page is doing a CORS but I have already handled that using ThinkTecture.IdentityModel. I am following the code herefor the file upload.
我在 MVC 4.5 WebApi 项目中收到 500 内部服务器错误。我可以使用 GET 和带有 Id 的 GET 成功调用我的网络服务。但是，当我发布文件时，出现错误。我可以在其中设置断点Application_BeginRequest()并确认我首先收到一个 OPTIONS 请求，然后是 POST。控制器中的方法没有被调用，我已经Application_Error()向 Global.asax.cs添加了一个也不会被命中的方法。html 页面正在执行 CORS，但我已经使用ThinkTecture.IdentityModel处理过。我正在按照此处的代码上传文件。
Any ideas?
有任何想法吗？
Here is the client code:
这是客户端代码：
<script type="text/javascript">
var UploadDocument = function () {
var url = sessionStorage.getItem("url");
var auth = sessionStorage.getItem("auth");
var data = new FormData();
jQuery.each($('#fileToUpload')[0].files, function (i, file) {
data.append('file-' + i, file);
});
jQuery.support.cors = true;
$.ajax({
type: "POST",
url: url,
data: data,
cache: false,
processData: false,
contentType: false,
//dataType: "json",
headers: { Authorization: 'Basic ' + auth },
crossDomain: true,
success: function (data, textStatus, jqXHR) {
alert('Success');
},
error: function (jqXHR, textStatus, errorThrown) { alert('Error: ' + textStatus + ' ' + errorThrown.message); }
});
};
</script>
My controller code looks like this:
我的控制器代码如下所示：
public int Post(HttpPostedFileBase FileToUpload)
{
// Do stuff with the file
}
The request and response look like this:
请求和响应如下所示：
Request URL:http://localhost:51234/api/TaxDocument
Request Method:POST
Status Code:500 Internal Server Error
Request Headers
Accept:*/*
Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Authorization:Basic YmNhbGxlbjpuZWxsYWM=
Connection:keep-alive
Content-Length:2054044
Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryIGzPKhvRVwFXbupu
Host:localhost:51234
Origin:http://localhost:52386
Referer:http://localhost:52386/Upload.html
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4
Response Headers:
Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:http://localhost:52386
Cache-Control:no-cache
Content-Length:1133
Content-Type:application/json; charset=utf-8
Date:Tue, 06 Nov 2012 21:10:23 GMT
Expires:-1
Pragma:no-cache
Server:Microsoft-IIS/8.0
X-AspNet-Version:4.0.30319
X-Powered-By:ASP.NET
X-SourceFiles:=?UTF-8?B?QzpccHJvamVjdHNcU2F2ZU15VzJcU2F2ZU15VzIuV2Vic2VydmljZVxhcGlcVGF4RG9jdW1lbnQ=?=
采纳答案by Alexei Levenkov
To see all exceptions turn following setting on:
要查看所有例外情况，请打开以下设置：
- VS 2013 (and below): Debug -> Exceptions -> CLR - check "when thrown".
- VS 2015: Debug -> Windows -> Exception Settings -> CLR
- VS 2013（及更低版本）：调试 -> 异常 -> CLR - 检查“抛出时”。
- VS 2015：调试 -> Windows -> 异常设置 -> CLR
You may need to uncheck "Tools->Options->Debugging->My code only" option if exception is thrown really outside of your code.
如果异常确实在您的代码之外抛出，您可能需要取消选中“工具->选项->调试->仅我的代码”选项。
回答by Protector one
You can try registering to the Errorevent of the HttpApplicationobject that's handling the request:
您可以尝试注册到正在处理请求Error的HttpApplication对象的事件：
HttpApplicationReference.Error += ErrorHandler;
The method that handles the error:
处理错误的方法：
public void ErrorHandler(object sender, EventArgs e)
{
System.Diagnostics.Debug.Write(
((System.Web.HttpApplication)sender).Server.GetLastError().ToString()
);
}
