这是一个很古老的逻辑，它返回一个字符串。

您将json.net序列化为字符串。然后你用Json（）序列化该字符串。你应该只使用json.net序列化。

  public string writeRecord（）
 {

 SqlConnection conn = DBTools.GetDBConnection（ApplicationServices2）; 


 string sqlquery =SELECT Q1，Q2，Q3，Q4，改进，来自myTable的注释; 
 SqlDataAdapter cmd = new SqlDataAdapter（sqlquery，conn）; 

 DataSet myData = new DataSet（）; 
 cmd.Fill（myData，myTable）; 

 conn.Open（）; 

 conn.Close（）; 


返回myData1 = JsonConvert.SerializeObject（myData，Formatting.Indented，
 new JsonSerializerSettings 
 {
 ReferenceLoopHandling = ReferenceLoopHandling.Ignore 
} ）; 

} 
 

I am trying to create a gridview in extjs using json. For some reason my gridview does not show any data. I tried to debug it with firebug. I can see the results in "Response" section. This is what I have in "Reponse".

{"ContentEncoding":null,"ContentType":null,"Data":"{\r\n \"myTable\": [\r\n {\r\n \"Q1\": \"1\",\r\n \"Q2\": \"1\",\r\n \"Q3\": \"1\",\r\n \"Q4\": \"1\",\r\n \"Improvements\": \"\",\r\n \"Comments\": \"1\"\r\n },\r\n {\r\n \"Q1\": \"1\",\r\n \"Q2\": \"2\",\r\n \"Q3\": \"3\",\r\n \"Q4\": \"4\",\r\n \"Improvements\": \"Iphone5\",\r\n \"Comments\": \"Iphone14\"\r\n },\r\n {\r\n \"Q1\": \"1\",\r\n \"Q2\": \"1\",\r\n \"Q3\": \"3\",\r\n \"Q4\": \"3\",\r\n \"Improvements\": \"This is Comment1-3\",\r\n \"Comments\": \"This is Comment2-3\"\r\n }\r\n ]\r\n}","JsonRequestBehavior":0}

Update Actually I see this in Json now, but my gridview is still empty Please click here to see my JSON

/GridViewApp.js

Ext.define('GridViewApp.view.GridViewApp', {
alias: 'widget.gridviewapp',
width: 800,
title: 'My Grid Panel',
grid: null,
store: null,
layout: {
    type: 'anchor'
},
constructor: function () {

    this.callParent(arguments);

    var store = Ext.create('Ext.data.Store', {

        storeId: 'myData',
        scope: this,
        fields: [
        { name: 'Q1', type: 'int' },
        { name: 'Q2', type: 'int' },
        { name: 'Q3', type: 'int' },
        { name: 'Q4', type: 'int' },
        { name: 'Q5', type: 'int' },
        { name: 'Improvements', type: 'string' },
        { name: 'Comments', type: 'string' }
        ],

        sorters: [
            {
                //property: 'myData',
                direct: 'ASC'
            }
         ],

        proxy: {
            type: 'ajax',
            scope: this,
            url: 'GridView/writeRecord',
            reader: {
                type: 'json',
                root: 'myTable',
                idProperty: 'ID'

                }
        } 
    });

    store.load();   
    this.grid = Ext.create('Ext.grid.Panel', {
        title: 'GridView App',
        store: this.store,
        columns: [
            {header: 'Q1', width: 100,
        sortable: true, dataIndex: 'Q1'
                    },
        { header: 'Q2', width: 100,
            sortable: true, dataIndex: 'Q2'
        },
        { header: 'Q3', width: 100,
            sortable: true, dataIndex: 'Q3'
        },
                    { header: 'Q4', width: 100,
                        sortable: true, dataIndex: 'Q4'
                    },
                    { header: 'Improvements', width: 200,
                        sortable: true, dataIndex: 'Improvements'
                    },
                    { header: 'Comments', width: 200,
                        sortable: true, dataIndex: 'Comments'
                    }
    ],
        stripeRows: true,
        width: 800,
        renderTo: Ext.getBody()
    });
    this.add(this.grid);
}
});

and /GridViewController.cs

namespace GridViewApp.Controllers
{
public class GridViewController : Controller
{

    public ActionResult Index()
    {
        return View();
    }


    public JsonResult writeRecord()
    {

        SqlConnection conn = DBTools.GetDBConnection("ApplicationServices2");


        string sqlquery = "SELECT Q1, Q2, Q3, Q4, Improvements, Comments FROM myTable";
        SqlDataAdapter cmd = new SqlDataAdapter(sqlquery, conn);

        DataSet myData = new DataSet();
        cmd.Fill(myData, "myTable");

        conn.Open();

        conn.Close();


        string myData1 = JsonConvert.SerializeObject(myData, Formatting.Indented,
                        new JsonSerializerSettings
                        {
                            ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                        });

        return Json(new { data = myData1 }, JsonRequestBehavior.AllowGet);
    } 

}
}

Any kind of input will be a big help... Thank you

It's pretty logic that it returns a string.

You serialize with json.net into a string. Then you serialize that string with Json(). You should only use the json.net serialization.

public string writeRecord()
{

    SqlConnection conn = DBTools.GetDBConnection("ApplicationServices2");


    string sqlquery = "SELECT Q1, Q2, Q3, Q4, Improvements, Comments FROM myTable";
    SqlDataAdapter cmd = new SqlDataAdapter(sqlquery, conn);

    DataSet myData = new DataSet();
    cmd.Fill(myData, "myTable");

    conn.Open();

    conn.Close();


    return myData1 = JsonConvert.SerializeObject(myData, Formatting.Indented,
                    new JsonSerializerSettings
                    {
                        ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                    });

}