Fill a DataSet or a DataTable from a LINQ query resultset

Asked By tarunsureja 0 points N/A Posted on - 07/21/2011

How do you expose a LINE query as an ASMX web service? Usually, from the business tier, I can return a typed DataSet or DataTable which can be serialized for transport over ASMX.

How can I do the same for a LINE query? Is there a way to populate a typed DataSet or DataTable via a LINE query?

Code is attached.

How can I get the resultset of a LINE query into a DataSet or DataTable? Alternatively, is the LINE query serializeable so that I can expose it as an ASMX web service?

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Answered By desh rathore 0 points N/A #86303

Fill a DataSet or a DataTable from a LINQ query resultset

I create a function which take query of line and return datatable.

 public DataTable LINEToDataTable<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 

       

          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;

}

 

 

Regards,

 

desh rathore

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• Posted on - 07/21/2011
• Question Category: C#