public IDictionary <TKey, TValue> GroupbyMax <TKey, TValue>(Expression <Func <T, object> > keyField, Expression <Func <T, object> > valueField, LogicalBinaryExpression logical)
{
var parameters = CreateParamterCollection();
string sql = new Queryable <T>(DbReader)
.Select(keyField)
.Max(valueField)
.Where(logical)
.GroupBy(keyField)
.OutputSqlString(parameters);
using (var reader = DbReader.ExecuteReader(sql, parameters))
{
return(reader.ToDictionary <TKey, TValue>());
}
}