Question

My DataTable Contains 17 columns, among which i am retrieving 3 columns. For Instance, we consider those 3 columns as colA, colB, colC. My requirement is, the resultant should be in a format of

Dictionary<string, Dictionary<string,string>> ( Dictionary<colA,Dictionary<colB,colC>> )

It would be better using LINQ…!

Dictionary<string, Dictionary<string, string>> roles = TA_Roles.GetRoleByUsername(Username)
    .Select(col => new { col.RoleID, col.Rolecode, col.Rolename }) 
    //Please continue from here..!

Answer 1

This should work if colA is unique:

Dictionary<string, Dictionary<string, string>> result = table.AsEnumerable().ToDictionary(row => row["colA"].ToString(),
                                                                                          row => new string[] { "colB", "colC" }.ToDictionary(col => col, col => row[col].ToString()));