表达式树转换

发布于 2024-09-14 05:07:05 字数 563 浏览 4 评论 0 原文

我有两个类：

class Customer
{
    public string Fullname { get; set; }
    public string Lastname { get; set; }
    public int Age { get; set; }
}

现在

class CustomerDTO
{
    public string Fullname { get; set; }
    public string Lastname { get; set; }
    public int Age { get; set; }
}

我有一个表达式树 Expression>;表达式在层之间传递，我可以将其转换为Expression>吗？表达式 才能使用它，因为它会给出编译时错误！

提前致谢

原文

I have two Classes :

class Customer
{
    public string Fullname { get; set; }
    public string Lastname { get; set; }
    public int Age { get; set; }
}

and

class CustomerDTO
{
    public string Fullname { get; set; }
    public string Lastname { get; set; }
    public int Age { get; set; }
}

now i have an expressiontree Expression<Func<Customer, bool>> expression Passed between layers , can i convert it to Expression<Func<CustomerDTO, bool>> expression to be able to use it since it would give compile time error!

thanks in advance

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呆橘 2024-09-21 05:07:05

没关系，我做到了

Expression<Func<Customer, bool>> expression = v => v.Fullname == "Johm";
         var par = Expression.Parameter(typeof(CustomerDTO));
         Expression<Func<CustomerDTO, bool>> ex = (Expression<Func<CustomerDTO, bool>>)Expression.Lambda(expression.Body, par);

nevermind i made it

Expression<Func<Customer, bool>> expression = v => v.Fullname == "Johm";
         var par = Expression.Parameter(typeof(CustomerDTO));
         Expression<Func<CustomerDTO, bool>> ex = (Expression<Func<CustomerDTO, bool>>)Expression.Lambda(expression.Body, par);

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