jQuery $ ajax函数在C＃中返回500 Internal Server Error

Question

when clicking a button I am passing some data to .cs file after page load.But I got 500 Internal Server Error while calling ajax function.

Ajax Function,

              $.ajax({
                type: "POST",
                url: "Home.aspx/getSelectedData",
                data: data,
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                //async: true,

calling Function,

[WebMethod]
[ScriptMethod(UseHttpGet = true)]
public List<pageResult> getSelectedData(string search_value)
{}

I got the following error,

 **POST http://localhost:4519/Home.aspx/getSelectedData 500 (Internal Server Error)**

Answer 1

Use the .cs file like this,

[WebMethod]
public static List<pageResult> getSelectedData(string search_value)
{}

For ajax calling in aspx you should define the method as Static then only it will working for you.

Answer 2

contentType is the type of data you're sending, so application/json ;

The default is application/x-www-form-urlencoded; charset=UTF-8 application/x-www-form-urlencoded; charset=UTF-8 .

If you use application/json , you have to use JSON.stringify() in order to send JSON object.

JSON.stringify() turns a javascript object to json text and stores it in a string.

$.ajax({
      type: "POST",
      url: "Home.aspx/getSelectedData",
      data: JSON.stringify(data),
      contentType: "application/json; charset=utf-8",
      dataType: "json",

Answer 3

change your ajax type to get

$.ajax({
                type: "get",
                url: "Home.aspx/getSelectedData",
                data: data,
                contentType: "application/json; charset=utf-8",
                dataType: "json",