如果项目文本为空，则跳过部分查询

我有一个疑问

            return uow.CustomerRepo
            .Get()
            .Where
            (
                c=>
                    c.Firstname.StartsWith(customerSearch.Initial) &&
                    c.Surname  == customerSearch.Surname           &&                        
                    c.Email    == customerSearch.Email             &&
                    c.Postcode == customerSearch.PostCode
            )

如果有的话，有没有办法跳过部分查询customerSearch是空的？

所以我想跳过这一部分

c.Surname  == customerSearch.Surname

if

customerSearch.Surname

Is empty

您可以通过检查条件来做到这一点customerSearch明确部分：

.Where
(
    c=>
        (customerSearch.Initial == null || c.Firstname.StartsWith(customerSearch.Initial)) &&
        (customerSearch.Surname == null || c.Surname  == customerSearch.Surname)           &&                        
        (customerSearch.Email == null || c.Email    == customerSearch.Email)             &&
        (customerSearch.PostCode == null || c.Postcode == customerSearch.PostCode)
)

如果您需要检查空字符串而不是null，相应地改变条件。