LINQ 学习路程 -- 查询操作 OfType

OfType操作根据集合中的元素是否是给定的类型进行筛选

IList mixedList = new ArrayList();
mixedList.Add();
mixedList.Add("One");
mixedList.Add("Two");
mixedList.Add();
mixedList.Add(new Student() { StudentID = , StudentName = "Bill" });

var stringResult = from s in mixedList.OfType<string>()
                   select s;

var intResult = from s in mixedList.OfType<int>()
                select s;

var stringResult = mixedList.OfType<string>();