Converting a dataset to JSON using .NET 3.5 in C#

Question

I have been searching for a simple way to convert a dataset from a PostgreSQL database to JSON for use in a project that I am building.

This is my first time using J

Answer 1

For others looking at this topic:

Here is the simplest way to convert a dataset to a JSON array as json_encode (PHP) does with ASP.Net:

using Newtonsoft.Json;

public static string ds2json(DataSet ds) {
    return JsonConvert.SerializeObject(ds, Formatting.Indented);
}

Answer 2

public static string GetJSONString(DataTable Dt)
{
    string[] StrDc = new string[Dt.Columns.Count];
    string HeadStr = string.Empty;

    for (int i = 0; i < Dt.Columns.Count; i++)
    {
        StrDc[i] = Dt.Columns[i].Caption;
        HeadStr += "\"" + StrDc[i] + "\" : \"" + StrDc[i] + i.ToString() + "¾" + "\",";
    }

    HeadStr = HeadStr.Substring(0, HeadStr.Length - 1);

    StringBuilder Sb = new StringBuilder();
    Sb.Append("{\"" + Dt.TableName + "\" : [");

    for (int i = 0; i < Dt.Rows.Count; i++)
    {
        string TempStr = HeadStr;
        Sb.Append("{");

        for (int j = 0; j < Dt.Columns.Count; j++)
        {
            TempStr = TempStr.Replace(Dt.Columns[j] + j.ToString() + "¾", Dt.Rows[i][j].ToString());
        }
        Sb.Append(TempStr + "},");
    }

    Sb = new StringBuilder(Sb.ToString().Substring(0, Sb.ToString().Length - 1));
    Sb.Append("]}");

    return Sb.ToString();
}

---

var JObject = eval('(' + JSONString + ');');
for(var i = 0; i < JObject .Employees.length; i++)
{

var val1 = JObject.Employees[i].EmployeeID;

var val2 = JObject.Employees[i].NationalIDNumber;

var val3 = JObject.Employees[i].Title;

var val4 = JObject.Employees[i].BirthDate;

var val5 = JObject .Employees[i].HireDate ;

}

Answer 3

public static T WriteJson<T>(this System.Data.DataSet dataSet)
{
    try
    {
        XmlDocument doc = new XmlDocument();
        doc.LoadXml(dataSet.GetXml());
        return (T)Convert.ChangeType(JsonConvert.SerializeXmlNode(doc).Replace("null", "\"\"").Replace("'", "\'"), typeof(T));
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

Answer 4

Use Newtonsofts Json.Net and check out DataTable JSON Serialization in JSON.NET and JavaScriptSerializer where it's used to create a DataSet-to-JSON converter.

Answer 5

Maybe you've heard about the system.runtime.serialization.json namespace in the newly announced .NET Framework 4.0.