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.netdatatablejson.netdeserialization
Abbas
Abbas

Reputation: 5044

How to convert JSON into a datatable?

Does anyone know how to convert a JSON string into a DataTable in ASP.NET? I know about Deserializing; I just want the datatable returned. Can anyone tell me how to convert it to a datatable?

Upvotes: 12

Views: 86701

Answers (5)

AAP
AAP

Reputation: 253

If you are in framework 2.0, you must import Json.net (http://json.codeplex.com/) in your project, if your framework is superior, it has JSON.

The code in vb.net framework 2.0:

Dim Table DataTable

Table = Json.JsonConvert.DeserializeObject(Of DataTable)(Json_string)

Upvotes: 0

coffekid
coffekid

Reputation: 605

This question is sorta outdated, but someone may be looking for answers, so here it goes. It didn't work with old JSON.NET, but today I upgraded to latest version and viola! It works great.

Have serialized a DataTable into Json back and forth, zero issues! This is an awesome new feature.

Upvotes: 2

Frank
Frank

Reputation: 3143

Assuming that your JSON string is a list of objects, each object will correspond to a row in the DataTable, viz:

public DataTable DerializeDataTable()
{
    const string json = @"[{""Name"":""AAA"",""Age"":""22"",""Job"":""PPP""},"
                       + @"{""Name"":""BBB"",""Age"":""25"",""Job"":""QQQ""},"
                       + @"{""Name"":""CCC"",""Age"":""38"",""Job"":""RRR""}]";
    var table = JsonConvert.DeserializeObject<DataTable>(json);
    return table;
}

This requires Newtonsoft's Json.NET framework.

Upvotes: 22

gourishankar
gourishankar

Reputation: 123

using Newtonsoft.Json;

string json = "[{"clientID":"1788","projectID":"19"},{"clientID":"1789","projectID":"24"},{"clientID":"1790","projectID":"24"},{"clientID":"1790","projectID":"23"},{"clientID":"1790","projectID":"21"}]";

DataTable tester = (DataTable) JsonConvert.DeserializeObject(json, (typeof(DataTable)));

Code for the above method

public object Deserialize(string jsonText, Type valueType)
{
    try
    {
        Newtonsoft.Json.JsonSerializer json = new Newtonsoft.Json.JsonSerializer();

        json.NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore;
        json.ObjectCreationHandling = Newtonsoft.Json.ObjectCreationHandling.Replace;
        json.MissingMemberHandling = Newtonsoft.Json.MissingMemberHandling.Ignore;
        json.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;

        StringReader sr = new StringReader(jsonText);

        Newtonsoft.Json.JsonTextReader reader = new JsonTextReader(sr);
        object result = json.Deserialize(reader, valueType);
        reader.Close();
        return result;
    }
    catch (Exception ex)
    {
        throw ex;
    }


}

Deserialize your jsonstring to some class

List<User> UserList = JsonConvert.DeserializeObject<User>(jsonString);

Write following extension method to your project

 public static DataTable ToDataTable<T>(this IList<T> data)
{
    PropertyDescriptorCollection props =
    TypeDescriptor.GetProperties(typeof(T));
    DataTable table = new DataTable();
    for (int i = 0; i < props.Count; i++)
    {
        PropertyDescriptor prop = props[i];
        table.Columns.Add(prop.Name, prop.PropertyType);
    }
    object[] values = new object[props.Count];
    foreach (T item in data)
    {
        for (int i = 0; i < values.Length; i++)
        {
            values[i] = props[i].GetValue(item);
        }
        table.Rows.Add(values);
    }
    return table;
}

Call extension method like

UserList.ToDataTable<User>();

Upvotes: 11

James Roland
James Roland

Reputation: 8262

I am not sure which JSON library you are using, but you might want to take a look at JSON.NET as there is a converter object type in there called this:

 Newtonsoft.Json.Converters.DataTableConverter
    // Summary:
    //     Converts a System.Data.DataTable to and from JSON.

I have not used this functionality before but you could have a go with it.

Upvotes: 1

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