如何在C＃中将数据集转换为数据表

Question

Here is my code -- I simply need to convert a SQL DataSet into a DataTable in asp.net 4.5. I can't seem to figure it out. There are many posts doing the opposite, but none that I can find that clearly answers.

public static DataTable getGender()
{
    DataTable DT = default(DataTable);        
    SqlConnection con = new SqlConnection(CnnString.ConnectionString.ToString());
    SqlCommand cmd = new SqlCommand("ns_gender_get", con);
    cmd.CommandType = CommandType.StoredProcedure;


    SqlDataAdapter da = new SqlDataAdapter();
    da.SelectCommand = cmd;
    DataSet ds = new DataSet();

    try
    {
        //Fill the Dataset
        da.Fill(ds, "Results");
        DT = ds.Tables(0);     

       //**GOAL:  I need to assign the DS.Table(0) to the DT (dataTable) so when this method is called it will return the table rows in the DT. 

    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        con.Close();
        con.Dispose();
        con = null;
    }
    return DT;
}

Answer 1

Actually, a DataSet contains a collection of DataTables . You can just take the first table:

DataTable dataTable = ds.Tables[0];

On the other hand, you can use a DataAdpter to fill a DataTable if you want, for sample:

DataTable dt = new DataTable();
da.Fill(dt);

See more in:

https://msdn.microsoft.com/library/system.data.dataset.tables(v=vs.110).aspx

http://www.dotnetperls.com/sqldataadapter

-- Edits by original author of the question (for anyone else looking) The simple solution finally hit me --

 ds.Tables.Add(DT); // Code on how to add a table to a dataset!

Here is a great way to speed up your code!!