如何解决asp.net页面中的ajax发布jquery？

Question

when i add alert(file) line after ajax block code work but when i remove alert(file) code not work .

this is work fine :

 function Delete(file) {

        $.ajax({
            type: "POST",
            url: "Image.aspx/Delete",
            data: '{file: "' + file + '" }',
            contentType: "application/json; charset=utf-8",
            datatype: "jsondata",
            async: "true",
            success: function (response) {
                $("#statusBox").text("ok"); //alert(response.d);
            },
            error: function (response) {
                $("#statusBox").text("error"+response.text);
               // alert(response.status + ' ' + response.statusText);
            },
            complete: function () {
              //  $("#statusBox").text("completed");
            }


        });

        alert(file);

    }

if i remove alert(file) line code web method not work.

this my c# asp.net code web method :

[WebMethod]
public static string Delete(string file)
{
    try
    {

        // int lastSlash=file.ind
        // Lesson learnt - always check for a valid URI
        if (Uri.IsWellFormedUriString(file, UriKind.Absolute))
        {
            Uri uri = new Uri(file);
            file = (uri.LocalPath);
        }
        //file=  file.Remove(0)

        //File.Delete(file);
         File.Delete(HttpContext.Current.Server.MapPath(@"~\" + file.Replace("/", @"\")));
    }
    catch (Exception ex)
    {
        return ex.Message;
    }

    return "ok";
}

Answer 1

I see three (3) errors in your code:

        data: '{file: "' + file + '" }',
        datatype: "jsondata",
        async: "true",

1. You are not sending a js object to the server.
2. jsondata is not a valid datatype.
3. async is a boolean and you are instead assigning a string value.

---

So the solution from here is:

        data: {file: file }, // send a object
        datatype: "text",    // change to text because you are returning "ok" string
        async: true,         // remove the quotes 

---

Another suggestion is try with default headers:

contentType: "application/json; charset=utf-8",

Try removing this line and see.

Answer 2

You're sending the request asynchronously,try to make false asynchronous. for more information take a look at this