背景介紹

OfType的定義十分簡單：IEnumerable.OfType(TResult)，如其定義，其中TRsult為所要過濾的類型。由于非泛型集合一律以Object類型存儲對象，因此一個非泛型集合可能存儲了各種類型，而OfType()方法可以輕松的對指定的類型進行過濾篩選。

代碼如下：

static void Main(string[] args){ List<Phone> PhoneLists = new List<Phone>(){new Phone { Country = "中國", City = "北京", Name = "小米" },new Phone { Country = "中國",City = "北京",Name = "華為"},new Phone { Country = "中國",City = "北京",Name = "聯想"},new Phone { Country = "中國",City = "臺北",Name = "魅族"},new Phone { Country = "日本",City = "東京",Name = "索尼"},new Phone { Country = "日本",City = "大阪",Name = "夏普"},new Phone { Country = "日本",City = "東京",Name = "松下"},new Phone { Country = "美國",City = "加州",Name = "蘋果"},new Phone { Country = "美國",City = "華盛頓",Name = "三星"},new Phone { Country = "美國",City = "華盛頓",Name = "HTC"}};var Lists = PhoneLists.Select(p => new GetMyPhone().MyPhone(p));var myLists = Lists.OfType<MyPhone>();foreach (var list in myLists){Console.WriteLine($"{list.MyCity} - {list.MyName}");}Console.Read();}public class Phone{public string Country { get; set; }public string City { get; set; }public string Name { get; set; }}public class MyPhone{public string MyCity { get; set; }public string MyName { get; set; }}public class GetMyPhone{public object MyPhone(Phone phone){if (phone.Country.Equals("中國")){MyPhone myphone = new Program.MyPhone(){MyCity = phone.City,MyName = phone.Name};return myphone;}else{return phone;}}}

?GetMyPhone類中的MyPhone方法取出指定條件的Phone，上述代碼中是Country為中國，組成MyPhone類型并返回，如果不滿足條件則返回原來的類型，這意味著屬性Lists中有兩種類型的實體類，而OfType可以將其中為MyPhone類型取出。

運行結果如下所示：

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總結

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