I've tried to find the answer to this but I've found no success. If it is possible how do you convert a string to a data set in C# so I can generate a JSON file from the data in my database table.
Here is my asmx file:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Services;
using System.Web.Script.Serialization;
using System.Data;
using System.Data.SqlClient;
namespace Book
{
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[ScriptService]
public class Service : System.Web.Services.WebService
{
SqlConnection con;
SqlDataAdapter adap;
DataSet ds;
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public DataSet GetBookList()
{
con = new SqlConnection(@"Data Source=server;Initial Catalog=database;Persist Security Info=True;User ID=username;pwd=password;");
adap = new SqlDataAdapter("SELECT * FROM tblBookList", con);
ds = new DataSet();
adap.Fill(ds, "tblBookList");
var jsonString = new JavaScriptSerializer().Serialize(ds);
return jsonString;
}
}
}
Or is there a smarter way to export the data into a JSON file?
The error that I am receiving is
Error: cannot implicitly convert type 'string' to 'System.Data.DataSet'
The error appears on the 'return jsonString;' statement.
Your function is defined as returning a DataSet.
You are returning a string.
Change the function definition to return a string.
public String GetBookList()
If you want to return the DataSet, just return the "ds" variable. Otherwise you are just returning a string that is a serialized version of the ds variable.
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