Linq中的泛型属性getter

这取决于你想怎么处理你的财产。为了避免对您感兴趣的每个属性重复整个LINQ查询,最好先获取测试对象,然后检查其各个属性:

class Hierarcy
{
   public IList<Level1> Level1;
   public Test GetTest(int ID)
   {
       return this
          .Level1
          .SelectMany(level => level.Test)
          .Where(test => test.ID == ID)
          .First();
   }
}

Test 类的所有属性:

Test t = myHierarchy.GetTest(someId);

// do something
int i = test.PropertyA;
string s = text.PropertyB;

如果您对动态获取属性的值感兴趣(仅使用其名称),则可以使用反射来执行此操作:

Test t = myHierarchy.GetTest(someId);

// this will print all properties and their values
foreach (PropertyInfo pi in t.GetType().GetProperties())
{
    Console.WriteLine("Name:{0}, Value:{1}",
       pi.Name,
       pi.GetValue(pi, null));
}

我想你可能想要这样的东西:

public static TResult GetTest(hierarchyObject, int ID, Func<Test, TResult> selector)
{
    return (from level1 in hierarchyObject.Level1
            from test in level1.Test
            where test.ID.Equals(ID)
            select selector(test)).First();
}

hiearchyObject.Level1.SelectMany(x=>x.Test).Where(test=>test.ID.Equals(ID)).Select(selector).First();

现在没有电脑来测试。

public static TResult GetTest<TResult> (.. , Func<Test, TResult> selector)