/// <summary>
/// 表达式树，起始为False，即非
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public Expression <Func <T, bool> > ExpressionFalse()
{
return(DynamicLinqExpressions.False <T>());
}
/// <summary>
/// 表达式树，起始为True
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public Expression <Func <T, bool> > ExpressionTrue()
{
return(DynamicLinqExpressions.True <T>());
}