Thought Persistence

Convert a LINQ Query Resultset to a DataTable
After a long struggle I find out the way to convert a Linq Query resultset to DataTable object. The attached source code shows how to do it. I am sharing this article with my developer friends and make their life easier.

Here are two samples.

Sample I:

I created a public method called LINQToDataTable as following:

public DataTable LINQToDataTable<T>(IEnumerable<T> varlist)
{
DataTable dtReturn = new DataTable();

// column names
PropertyInfo[] oProps = null;

if (varlist == null) return dtReturn;

foreach (T rec in varlist)
{
// Use reflection to get property names, to create table, Only first time, others
will follow
if (oProps == null)
{
oProps = ((Type)rec.GetType()).GetProperties();
foreach (PropertyInfo pi in oProps)
{
Type colType = pi.PropertyType;

if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition()
==typeof(Nullable<>)))
{
colType = colType.GetGenericArguments()[0];
}

dtReturn.Columns.Add(new DataColumn(pi.Name, colType));
}
}

DataRow dr = dtReturn.NewRow();

foreach (PropertyInfo pi in oProps)
{
dr[pi.Name] = pi.GetValue(rec, null) == null ?DBNull.Value :pi.GetValue
(rec,null);
}

dtReturn.Rows.Add(dr);
}
return dtReturn;
}

---------------------------------------------------------------

Example: To use this method, just use the following code sample:

---------------------------------------------------------------

var vrCountry = from country in objEmpDataContext.CountryMaster
select new {country.CountryID,country.CountryName};

DataTable dt = LINQToDataTable(vrCountry);

Sample II

Here is my second method:

public DataTable ToDataTable(System.Data.Linq.DataContext ctx, object query)
{
if (query == null)
{
throw new ArgumentNullException("query");
}

IDbCommand cmd = ctx.GetCommand(query as IQueryable);
SqlDataAdapter adapter = new SqlDataAdapter();
adapter.SelectCommand = (SqlCommand)cmd;
DataTable dt = new DataTable("sd");

try
{
cmd.Connection.Open();
adapter.FillSchema(dt, SchemaType.Source);
adapter.Fill(dt);
}
finally
{
cmd.Connection.Close();
}
return dt;
}

---------------------------------------------------------------

Example: To use this method, just use the following code sample:

---------------------------------------------------------------

var vrCountry = from country in objEmpDataContext.CountryMaster
select new {country.CountryID,country.CountryName};

DataTable dt = LINQToDataTable(objEmpDataContext,vrCountry);