How to convert a Linq query to a DataTable C#

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When I try to COnvert Linq to a Data Table using the below code I'm getting and exception. Please help me to solve this. The Details are below:

Code:

C#

DataTable boundTable = new DataTable();

IEnumerable<DataRow> results1 = (IEnumerable<DataRow>) (
  from rowDict in dsEstimatesParam.Tables[strTableName].AsEnumerable()
  join rowMaster in dsAttributes.Tables[strTableName1].AsEnumerable()
    on rowDict["ID"] equals rowMaster["ID"]
  join rowAttDep in dsParam.Tables["Dependencies"].AsEnumerable()
    on rowMaster["ID"] equals rowAttDep["ID"]
  where Convert.ToString(rowAttDep["Name"]) == strColumn
  select rowDict[strColumn] == DBNull.Value ? 0 : Convert.ToDecimal(rowDict[strColumn]));

boundTable = results1.CopyToDataTable<DataRow>();

Exception:

Unable to cast object of type 'WhereSelectEnumerableIterator`2[<>f__AnonymousType5`2[<>f__AnonymousType1`2[System.Data.DataRow,System.Data.DataRow],System.Data.DataRow],System.Decimal]' to type 'System.Collections.Generic.IEnumerable`1[System.Data.DataRow]'

Thanks & Regards,
Mathi.

Posted 26-Jan-15 21:09pm

Mathi2code

Updated 26-Nov-19 16:49pm

Tomas Takac

v2

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Tomas Takac 27-Jan-15 3:15am

You are selecting a decimal, not a DataRow.

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DamithSL · Accepted Answer · 2015-01-26T21:22:00

you need to select data row in your linq query, for example

C#

IEnumerable<datarow> query =
  from rowDict in dsEstimatesParam.Tables[strTableName].AsEnumerable()
  join rowMaster in dsAttributes.Tables[strTableName1].AsEnumerable()
    on rowDict["ID"] equals rowMaster["ID"]
  join rowAttDep in dsParam.Tables["Dependencies"].AsEnumerable()
    on rowMaster["ID"] equals rowAttDep["ID"]
  where Convert.ToString(rowAttDep["Name"]) == strColumn
  select rowDict;
DataTable boundTable = query.CopyToDataTable<datarow>();</datarow></datarow>