linq - 动态 linq 无法解析排序

Question

假设我有一个查询，它选择一个定义的类型，如下所示：

public class SomeObject
{
     public DateTime CreatedDate { get; set; }
}

private class MyType
{
    internal SomeObject Object1 { get; set; }
    internal SomeThing Object2 { get; set; }
    internal DateTime SomeDate { get; set; }   
}

var query =  from bla in context.Melp join ..... 
             select new MyType()
             {
                  Object1 = something,
                  Object2 = somethingelse,
                  SomeDate = bla.date
             }

现在我们 DynamicLinq 在结果集上添加动态的、用户定义的排序，如下所示：

query.OrderBy("SomeDate"); 

或者

query.OrderBy("Object1.CreatedDate");

但是当我尝试订购时，例如，“SomeDate”或“Object1.CreatedDate”，我收到提示异常：

“MyType”类型中不存在属性或字段“SomeDate”

现在，当我只是将方法语法中的排序添加到查询中时：

query = query.OrderBy(x => x.SomeDate)

或者

query = query.OrderBy(x => x.Object1.CreatedDate)

一切正常，所以我认为这可能是 DynamicLinq 中的一个错误，或者我说错了......

有任何想法吗？

Answer 1

Dynamic Linq makes heavy use of Reflection. Maybe it is a problem because your properties are marked as internal and the method <Type>.GetProperty method (which will be used by the Dynamic Linq library) will not watch for internal properties unless the BindingFlags would be adapted.

Give it a try to mark them public and your class also.