关于asp.net mvc：如何从global.asax中的App_Error返回json格式的异常数据？

How to return exception data in json format from App_Error in global.asax?

我正在将Asp.net MVC项目作为单页面应用程序进行错误处理。
我希望将global.asax中的Application_Error方法中的json数据返回给UI并通过jQuery显示它或调用控制器返回partialView。

我不想刷新页面或将其重定向到错误页面。

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这是要走的路

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protected void Application_Error(object sender, EventArgs e)
{
Exception exception = Server.GetLastError();

// if the error is NOT http error, then stop handling it.
if (!(exception is HttpException httpException))
return;

if (new HttpRequestWrapper(Request).IsAjaxRequest())
{
Response.Clear();
Response.TrySkipIisCustomErrors = true;
Server.ClearError();

Response.ContentType ="application/json";
Response.StatusCode = 400;
JsonResult json = new JsonResult
{
Data = exception.Message
};

json.ExecuteResult(new ControllerContext(Request.RequestContext, new BaseController()));
}
}

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//Write This code into your global.asax file

protected void Application_Error(Object sender, EventArgs e)
{
var ex = Server.GetLastError();
//We check if we have an AJAX request and return JSON in this case
if (IsAjaxRequest())
{
Response.Write(JsonConvert.SerializeObject(new
{
error = true,
message ="Exception:" + ex.Message
})
);
}
}

private bool IsAjaxRequest()
{
//The easy way
bool isAjaxRequest = (Request["X-Requested-With"] =="XMLHttpRequest")
|| ((Request.Headers != null)
&& (Request.Headers["X-Requested-With"] =="XMLHttpRequest"));

//If we are not sure that we have an AJAX request or that we have to return JSON
//we fall back to Reflection
if (!isAjaxRequest)
{
try
{
//The controller and action
string controllerName = Request.RequestContext.
RouteData.Values["controller"].ToString();
string actionName = Request.RequestContext.
RouteData.Values["action"].ToString();

//We create a controller instance
DefaultControllerFactory controllerFactory = new DefaultControllerFactory();
Controller controller = controllerFactory.CreateController(
Request.RequestContext, controllerName) as Controller;

//We get the controller actions
ReflectedControllerDescriptor controllerDescriptor =
new ReflectedControllerDescriptor(controller.GetType());
ActionDescriptor[] controllerActions =
controllerDescriptor.GetCanonicalActions();

//We search for our action
foreach (ReflectedActionDescriptor actionDescriptor in controllerActions)
{
if (actionDescriptor.ActionName.ToUpper().Equals(actionName.ToUpper()))
{
//If the action returns JsonResult then we have an AJAX request
if (actionDescriptor.MethodInfo.ReturnType
.Equals(typeof(JsonResult)))
return true;
}
}
}
catch
{

}
}

return isAjaxRequest;
}

//Write this code in your ajax function in html file

<script type="text/javascript">

$.ajax({
url: Url
type: 'POST',
data: JSON.stringify(json_data),
dataType: 'json',
cache: false,
contentType: 'application/json',
success: function (data) { Successfunction(data); },
error: function (xhr, ajaxOptions, thrownError) {
var obj = JSON.parse(xhr.responseText);
if (obj.error) {
show_errorMsg(obj.message);
}
}
});