如何从application_error返回AJAX错误函数?

My code below ends up in the AJAX success function. Why? It should execute the error function. What am I doing wrong?

下面的代码以AJAX success函数结尾。为什么?它应该执行错误函数。我做错了什么?

$.ajax({
    url: url,
    type: "POST",
    data: data,
    contentType: "application/json; charset=utf-8",
    success: function(data) {
        if (callback)
            callback(data);

        $.LoadingOverlay("hide");
    },
    error: function (event, jqxhr, settings, thrownError) {
        var t = "";

    }
});

protected void Application_Error(object sender, EventArgs e)
{
    var ctx = HttpContext.Current;

    var exception = ctx.Server.GetLastError();

    bool isAjaxCall = string.Equals("XMLHttpRequest", Context.Request.Headers["x-requested-with"], StringComparison.OrdinalIgnoreCase);
    Context.ClearError();
    if (isAjaxCall)
    {
        //Context.Response.ContentType = "application/json";
        Context.Response.StatusCode = 200;
        Context.Response.Write(
            new JavaScriptSerializer().Serialize(
                new { error = exception.Message }
            )
        );
    }
}

The controller simply throws an exception:

控制器简单地抛出一个异常:

throw new Exception("faulty");

1 个解决方案

#1

The error handler of $.ajax is executed when a HttpStatusCode of anything other than 2xx is received. With that in mind, you could return a 500 Internal Server Error, like this:

$的错误处理程序。当接收到除2xx以外的任何内容的HttpStatusCode时，将执行ajax。考虑到这一点，您可以返回500个内部服务器错误，如下所示:

protected void Application_Error(object sender, EventArgs e)
{
    var ctx = HttpContext.Current;
    var exception = ctx.Server.GetLastError();
    bool isAjaxCall = string.Equals("XMLHttpRequest", Context.Request.Headers["x-requested-with"], StringComparison.OrdinalIgnoreCase);
    Context.ClearError();

    if (isAjaxCall)
    {
        Context.Response.StatusCode = 500; // note the change here
        Context.Response.Write(new JavaScriptSerializer().Serialize(new { error = exception.Message }));
    }
}