Question

I have an Query expression that uses a predicate type and lambda expression.
I am getting desired result with this. But I am not clear with how this expression is getting evaluated.

I tried to break this lambda expression by creating delegate and replacing condition under Where with delegate type.

If I have to rewrite the same thing with writing a delegate instead of anonymous type. What will be the syntax. How the delegate will be return for the same.

if (((DataTable)dgvAssignedRpm.DataSource).AsEnumerable()
    .Where(row => row.Field<long>("FK_RPM_BTN_SETTING_ID") == objRpmButtonHolder.RpmSettingId).Count() > 1)
{
  List<DataRow> listPkgBtnSettings = SearchForExistingSettingId();
}

Answer 1

void MethodSignature(...) 
{ 
  ...  

  if (((DataTable)dgvAssignedRpm.DataSource).AsEnumerable()
    .Where(RowCondition)
  {
    List<DataRow> listPkgBtnSettings = SearchForExistingSettingId();
  }

  ...
}

// Where want a Func<T,bool> parameter 
// T is the first parameter type (DataRow here)
// bool represents the return value
bool RowCondition(DataRow row)
{
  return row.Field<long>("FK_RPM_BTN_SETTING_ID") == objRpmButtonHolder.RpmSettingId).Count() > 1
}