解析JSON数据ASP.NET C＃和Razor

Question

Hi I'm working in VS with ASP.NET and razor, trying to fill a table with values from a db table but I have to decode or parse Json to simple text. I really appreciate some help. This is what i´m getting.

  [HttpGet] public ActionResult GetData() { string stdb = "Data Source=DMX87025;Initial Catalog=DB_PCC;Integrated Security=True"; SqlConnection conn = new SqlConnection(stdb); string sql = "SELECT *FROM[DB_PCC].[dbo].[Departments]"; SqlCommand cmd = new SqlCommand(sql, conn); conn.Open(); SqlDataReader rd = cmd.ExecuteReader(); var st = "kyo please help me uu"; return Json(new { success = true, message = rd }, JsonRequestBehavior.AllowGet); } 

This is my AJAX ...

 <div id="result"></div> <input type="button" name="name" value="try" onclick="DepListQuery()" /> <script> function DepListQuery() { $.ajax({ type: 'GET', url: '@Url.Action("GetData","Home")', contentType: "application/json; charset=utf-8", dataType: "json", success: function (response) { $('#result').text(response.message); }, failure: function (response) { alert("something get wrong uu"); } }); } </script> 

Answer 1

First thing you need to fix is how you read data from the SqlDataReader . Here is a tutorial on doing so: http://csharp-station.com/Tutorial/AdoDotNet/Lesson04

But even better would be to read data directly into objects. See this answer for details on creating such extension methods: Convert rows from a data reader into typed results

The sample extension method:

public static List<T> ReadList<T>(this IDataReader reader, 
                                  Func<IDataRecord, T> generator) {
     var list = new List<T>();
     while (reader.Read())
         list.Add(generator(reader));
     return list;
}

After your SqlDataReader rd = cmd.ExecuteReader(); line, you'd need something like:

var departmentList = reader.ReadList(x => new Department {
                                           DeptID = x.GetInt32(0),
                                           DeptName = x.GetString(1)
                                    });

Then, once you have such a list of objects, you can return them to the front-end view ajax:

How to parse JSON list of string on ajax return?

List of Objects To Json String

I also want to note that you should surround your SqlConnection , SqlCommand , SqlDataReader , etc with using blocks.