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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Threading.Tasks; | |
| namespace NewFeatures | |
| { | |
| //1. Using Static Members | |
| using static System.Math; | |
| class Foo | |
| { | |
| //0. Getter-only auto-properties & Initializer for auto-properties | |
| //"private set" is not needed anymore for readonly properties | |
| public string None { get; } = "Nothing"; | |
| } | |
| class Program | |
| { | |
| //3. Expression Bodied properties | |
| //equals to string GetHating(string a, string b) => { return $"{a} hates {b}."; } | |
| static string GetHating(string a, string b) => $"{a} hates {b}."; | |
| //4. Index initializer | |
| static Dictionary<string, string> GetDic(string a, string b) => | |
| new Dictionary<string, string> { | |
| ["love"] = $"{a} loves {b}." | |
| ,["hate"] = $"{a} hates {b}." | |
| ,["kill"] = $"{b} wanna kill {a}." | |
| }; | |
| static async void DemoException() | |
| { | |
| //6. exception filter & await in try...catch...finally | |
| try | |
| { | |
| throw new Exception("Anyway"); | |
| } | |
| catch(Exception e) when (e.Message.Contains("Anyway")) | |
| { | |
| await Task.Delay(1000); | |
| Console.WriteLine("Exception Caught!"); | |
| } | |
| } | |
| static void Main(string[] args) | |
| { | |
| //1. Using Static Members continued | |
| //2. String Interpolation | |
| Console.WriteLine($"Sqr(4)={Sqrt(4)}"); | |
| //3. Expression Bodied properties continued | |
| Console.WriteLine(GetHating("Megatron", "Optimus")); | |
| //4. Null-Conditional Operator | |
| //also available for event, such as "OnChanged?.Invoke(sender, args);" | |
| Dictionary<string, string> dic = GetDic("Shingen", "Kenshin"); | |
| if(dic["kill"]?.GetType() == typeof(String) && dic["kill"]?.Length > 0) | |
| { | |
| Console.WriteLine(dic["kill"]); | |
| } | |
| //5. nameof operator | |
| //refletion machanisum, when the name of an object changed, hard-coding of its name may be missed | |
| //so nameof operator can help automatically get name of the object to avoid problem of hard-coding | |
| Console.WriteLine($"name of {nameof(dic)} is {nameof(dic)}"); | |
| //6. exception filter & await in try..catch...finally continued | |
| DemoException(); | |
| /**********************************/ | |
| Console.WriteLine("This is the End!"); | |
| Console.ReadKey(); | |
| } | |
| } | |
| } |
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