这是表达式树的正确用法吗？

Question

我有这两个相似的方法，我觉得它们可以用传递大于或小于符号的表达式树代替

public List<IAccount> IsGreater(DateTime someDate)
{    
    return AccountList.Where(a => 
           a.AccountDate >= someDate && a.SomeBoolMethod() && a.SomeOtherBoolMethod()) 
}

public List<IAccount> IsLess(DateTime someDate)
{    
    return AccountList.Where(a => 
           a.AccountDate < someDate && a.SomeBoolMethod() && a.SomeOtherBoolMethod())   
}

从我读到的关于表达式树的内容来看，我觉得这样的东西可能是有序的

 Expression<Func<DateTime, ExpressionType, DateTime, bool, bool, bool, List<IAccount>>> 
      expression = (a, b, c, d, e, f) =>
      {
          // not sure how to do this here
      }

我在正确的街区吗？

Answer 1

为什么要构建整个表达式树？就目前的问题来说，你直接比较就可以了。

public List<IAccount> FilterAccounts( Predicate<IAccount> condition )
{    
    return AccountList.Where(a => condition(a) && a.SomeBoolMethod() && a.SomeOtherBoolMethod() )
}

public List<IAccount> IsGreater(DateTime someDate)
{    
    return FilterAccounts( a => a.AccountDate >= someDate );
}

public List<IAccount> IsLess(DateTime someDate)
{    
    return FilterAccounts( a => a.AccountDate < someDate );
}

这是表达式树的正确用法吗？

Would this be the correct usage of an expression tree?

c#

expression-trees