/// <summary>
/// Sum using expression. e.g. p => p.FirstName;
/// </summary>
/// <typeparam name="TVal">Type of values to return.</typeparam>
/// <param name="exp">Matching expression.</param>
/// <returns>List of distinct values.</returns>
public virtual List <TVal> Distinct <TVal>(Expression <Func <T, object> > exp)
{
string propName = RepositoryExpressionHelper.GetPropertyName <T>(exp);
return(InternalDistinct <TVal>(propName, null));
}
/// <summary>
/// Group(date)(CreateDate)
/// </summary>
/// <typeparam name="TGroup">Type of group to use.</typeparam>
/// <param name="exp">Matching expression.</param>
/// <returns>List of key/value pairs.</returns>
public virtual List <KeyValuePair <TGroup, int> > Group <TGroup>(Expression <Func <T, object> > exp)
{
string propName = RepositoryExpressionHelper.GetPropertyName <T>(exp);
return(InternalGroup <TGroup>(propName, null));
}
/// <summary>
/// Sum using expression. e.g. p => p.FirstName;
/// </summary>
/// <param name="exp">Expression representing the column name via property name</param>
/// <returns>Average of entities.</returns>
public virtual double Avg(Expression <Func <T, object> > exp)
{
return(Avg(RepositoryExpressionHelper.GetPropertyName <T>(exp)));
}