c# - MVC Linq 查询在 WHERE 子句中使用动态列名

Question

我对同一查询进行了多次调用，但 WHERE 子句略有不同，有谁知道是否可以传递变量作为列名，因为我似乎无法实现它.

我知道以下内容不正确，但只是为了让您了解我想要实现的目标。

public EmailUserListViewModel EmailUserListData(int CaseId, string ColumnName)
{
    CaseId = CaseId,
    EmailUserList = (from u in efContext.PgsUsers
                        where ColumnName == true
                        orderby u.FirstName, u.LastName
                        select new EmailUserListModel
                        {
                            UserId = u.Id,
                            Name = ((u.FirstName == null) ? "" : u.FirstName) 
                                   + ((u.LastName == null) ? "" : " " + u.LastName),
                            Email = u.Email,
                            Checked = false

                        }).ToList()
    };
}

Answer 1

我想你可以使用反射来动态检索属性的值

from u in efContext.PgsUsers where (typeof(PgsUser).GetProperty(ColumnName).GetValue(u) as bool) == true

或

from u in efContext.PgsUsers where (u.GetType().GetProperty(ColumnName).GetValue(u) as bool) == true