这是我的应用程序中当前的代码,使用匿名委托来搜索属性集合:

public class MyObject
{
    public MyObject() { }

    public string MyObjectId { get; set; }
    public List<MySubObject> SubObjects { get; set; }
}

public class MySubObject
{
    public MySubObject() { }

    public string MySubObjectId { get; set; }
}

public List<MyObject> Search(string input)
{
    List<MyObject> AllObjects = Data.GetAllObjects();
    List<MyObject> SearchResults = new List<MyObject>();

    SearchResults = AllObjects.FindAll
    (
        delegate(MyObject o)
        {
            return e.MyObjectId.Equals(input)
        }
    );

    if (SearchResults .Count.Equals(0))
            SearchResults = null;

        return SearchResults ;
}


我想修改匿名委托以通过通用列表中的MySubObject.MySubObjectId属性而不是MyObjectId属性进行搜索。我将如何修改匿名委托中的代码以实现此目的?

最佳答案

尝试以下

delegate(MyObject o) {
  var mySubObject = o as MySubObject;
  return mySubObject != null && mySubObject.MySubObjectId == input;
}


请注意,您也可以在此处使用较短的lambda语法

(o) => {
  var mySubObject = o as MySubObject;
  return mySubObject != null && mySubObject.MySubObjectId == input;
}


或LINQ查询

var searchResult = AllObjects
  .OfType<MySubObject>()
  .Where(x => x.MySubObjectId == input)
  .Cast<MyObject>()
  .ToList()

10-06 04:32