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C# 6.0 新特性
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C# 6.0 加入了不少东西，C# 的 语言风格变得更好了,周末忙了一上午做了一个demo. 直接代码上来
完整代码:
#define ASYNC
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using static System.Math;
namespace NewCharp6
{
class Program
{
static void Main(string[] args)
{
//Initilizers for auto properties and function with lambda
var salesOrder = new SalesOrder();
Console.WriteLine("Begin to Test New In C# 6.0");
Console.WriteLine("=====================Auto Init Property lambda In A class=======================");
Console.WriteLine("OrderNo:" + salesOrder.OrderNo);
Console.WriteLine("OrderCode:" + salesOrder.OrderCode);
Console.WriteLine("OrderInfo:" + salesOrder.OrderInfo);
Console.WriteLine("GetOrderInfo:" + salesOrder.GetOrderInfo());
Console.WriteLine("=====================Test Null Conditional Operators=======================");
Console.WriteLine("Here Will Output Null Value.............");
SalesInovice salesInvoice = new SalesInovice();
Console.WriteLine(salesInvoice.OrderList?[0].OrderNo);//sample Operator
Console.WriteLine(salesInvoice.salesReturn?.returnCode);//sample Operator
//Initializers the Orders And Retutn
Console.WriteLine("Here Will Output Actual Value After Initializer the Object.............");
salesOrder.OrderNo = Guid.NewGuid();
salesOrder.OrderCode = "OS0001";
salesInvoice.OrderList = new List<SalesOrder>();
salesInvoice.OrderList.Add(salesOrder);
salesInvoice.salesReturn = new SalesReturn();
salesInvoice.salesReturn.returnNo = Guid.NewGuid();
salesInvoice.salesReturn.returnCode = "RT0001";
Console.WriteLine(salesInvoice.OrderList?[0].OrderNo + ":" + salesInvoice.OrderList?[0].OrderCode);
Console.WriteLine(salesInvoice.salesReturn?.returnNo + ":" + salesInvoice.salesReturn?.returnCode);
//Index Initializers
Console.WriteLine("Initializer An Collections With Index .............");
var returnDictionary = new Dictionary<int, SalesReturn>() { [0] = new SalesReturn() { returnNo = Guid.NewGuid(), returnCode = "RT001" }, [1] = new SalesReturn { returnNo = Guid.NewGuid(), returnCode = "RT002" } };
Console.WriteLine("Here Will Output the Dictionary：" + returnDictionary[0]?.returnNo + returnDictionary[0]?.returnCode);
var returnStrDictionary = new Dictionary<String, SalesReturn>() { ["One"] = new SalesReturn { returnNo = Guid.NewGuid(), returnCode = "RT001" }, ["Two"] = new SalesReturn { returnNo = Guid.NewGuid(), returnCode = "RT002" } };
Console.WriteLine("Here Will Output the Dictionary：" + returnStrDictionary["One"]?.returnNo + returnStrDictionary["One"]?.returnCode);
//Here Will Output All Object in the Dictionarys
foreach (KeyValuePair<string, SalesReturn> item in returnStrDictionary)
{
Console.WriteLine("Key:" + item.Key + string.Format(" {0}-{1}", item.Value.returnNo, item.Value.returnCode));
}
//Here will Output the math function Directly Before we Will use System.Math.abs But Now Just use abs
Console.WriteLine("=====================Using static NameSpace=======================");
Console.WriteLine("using static System.Math at the head firse");
Console.WriteLine("Output the abs value:" + Abs(-7));
//Exception Filter In C# 6.0
#if ASPNET
Console.WriteLine("=====================Exception Filter In C# 6.0=======================");
try
{
try
{
Console.WriteLine("begin to throw ASPNET EXCEPTION.........");
throw new ExceptionHander("ASP.Net Exception");
}
catch (ExceptionHander ex) when (ExceptionHander.CheckEx(ex))
{//ASPNET EXCEPTION WILL NOT CATCH HERE
Console.WriteLine("Exception Type:" + ex.Message + "Was Catch the Other was Missing .......");
}
}
catch (ExceptionHander ex)
{//ASPNET EXCEPTION WILL CATCH HERE
Console.WriteLine(ex.Message);
}
#elif DATABASE
try
{
try
{
Console.WriteLine("begin to throw DATABASE EXCEPTION.........");
throw new ExceptionHander((int)ExType.DATABASE, "DataBase Exception");
}
catch (ExceptionHander ex) when (ExceptionHander.CheckEx(ex))
{
Console.WriteLine("Exception Type:" + ex.Message + "Was Catch the Other was Missing .......");
}
}
catch (ExceptionHander ex)
{//DATABASE EXCEPTION WILL CATCH HERE
Console.WriteLine(ex.Message);
}
#elif ASYNC
Console.WriteLine("========Begin To Test async in catch and finally blocks(C#6.0 Only)===============");
try
{
throw new Exception("Error Occur");
}
catch (Exception ex)
{
//TODO can‘t use the async In Mian
// var returnAsync = await ProcessWrite(ex.Message);
}
#endif
Console.ReadKey();
}
protected static SalesOrder GetSales()
{
SalesOrder salesOrder = new SalesOrder();
salesOrder.OrderCode = "SO001";
return salesOrder;
}
//async read and write
public async void ProcessWrite(string text)
{
string filePath = System.Environment.CurrentDirectory + "commonLog.txt";
await WriteTextAsync(filePath, text);
}
private async Task WriteTextAsync(string filePath, string text)
{
byte[] encodedText = Encoding.Unicode.GetBytes(text);
using (FileStream sourceStream = new FileStream(filePath,
FileMode.Append, FileAccess.Write, FileShare.None,
bufferSize: 4096, useAsync: true))
{
await sourceStream.WriteAsync(encodedText, 0, encodedText.Length);
};
}
public async void ProcessRead()
{
string filePath = @"temp2.txt";
if (File.Exists(filePath) == false)
{
Debug.WriteLine("file not found: " + filePath);
}
else
{
try
{
string text = await ReadTextAsync(filePath);
Debug.WriteLine(text);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
}
private async Task<string> ReadTextAsync(string filePath)
{
using (FileStream sourceStream = new FileStream(filePath,
FileMode.Open, FileAccess.Read, FileShare.Read,
bufferSize: 4096, useAsync: true))
{
StringBuilder sb = new StringBuilder();
byte[] buffer = new byte[0x1000];
int numRead;
while ((numRead = await sourceStream.ReadAsync(buffer, 0, buffer.Length)) != 0)
{
string text = Encoding.Unicode.GetString(buffer, 0, numRead);
sb.Append(text);
}
return sb.ToString();
}
}
}
public class SalesOrder
{
public Guid OrderNo { get; set; } = new Guid();
public String OrderCode { get; set; }
public Int32 Quanlity { get; set; }
public double UnitPrice { get; set; }
public String OrderInfo => string.Format("lambda to property demo {0}:{1}", OrderNo, OrderCode);//lambda for properyies
public String GetOrderInfo() => string.Format("lambda to function demo {0}:{1}", OrderNo, OrderCode);//lambda for functions
}
public class SalesInovice
{
public Guid InvoiceNo { get; set; }
public String InvoiceCode { get; set; }
public List<SalesOrder> OrderList { get; set; }
public SalesReturn salesReturn { get; set; }
}
public class SalesReturn
{
public Guid returnNo { get; set; }
public String returnCode { get; set; }
}
public class ExceptionHander : Exception
{
public int TypeofException { get; set; } = (int)ExType.ASPNET;
public string Msg { get; set; }
public ExceptionHander(int Type, string Message) : this(Message)
{
TypeofException = Type;
}
public ExceptionHander(String msg)
{
Msg = msg;
}
public static Boolean CheckEx(ExceptionHander ex)
{
if (ex.TypeofException.Equals(ExType.DATABASE))
{
return true;
}
else
{
return false;
}
}
}
public enum ExType
{
DATABASE = 0,
ASPNET = 1
}
}
代码解读:
一.属性，方法的 lambda 表示法.
public
class
SalesOrder
{
public Guid OrderNo { get; set; } = new Guid();
public String OrderCode { get; set; }
public Int32 Quanlity { get; set; }
publicdouble UnitPrice { get; set; }
public String OrderInfo => string.Format("lambda to property demo {0}:{1}", OrderNo, OrderCode);//lambda for properyies public String GetOrderInfo() => string.Format("lambda to function demo {0}:{1}", OrderNo, OrderCode);//lambda for functions
}
二.空值判断 更加简洁
Console.WriteLine(salesInvoice.OrderList?[0].OrderNo + ":" + salesInvoice.OrderList?[0].OrderCode); Console.WriteLine(salesInvoice.salesReturn?.returnNo + ":" + salesInvoice.salesReturn?.returnCode);
三. 集合根据index 初始化
Console.WriteLine("Initializer An Collections With Index .............");
var returnDictionary = new Dictionary<int, SalesReturn>() { [0] = new SalesReturn() { returnNo = Guid.NewGuid(), returnCode = "RT001" }, [1] = new SalesReturn { returnNo = Guid.NewGuid(), returnCode = "RT002" } };
Console.WriteLine("Here Will Output the Dictionary：" + returnDictionary[0]?.returnNo + returnDictionary[0]?.returnCode);
四. 支持异常过滤 用 在catch 后用when关键字
try
{
try
{
Console.WriteLine("begin to throw DATABASE EXCEPTION.........");
throw new ExceptionHander((int)ExType.DATABASE, "DataBase Exception");
}
catch (ExceptionHander ex) when (ExceptionHander.CheckEx(ex))
{
Console.WriteLine("Exception Type:" + ex.Message + "Was Catch the Other was Missing .......");
}
}
catch (ExceptionHander ex)
{//DATABASE EXCEPTION WILL CATCH HERE
Console.WriteLine(ex.Message);
}
五.支持在catch 和 finally 上使用 异步方法
GitHub Code 下载: https://github.com/ShenZhenMS/NewFeatureCSharp6.git
参考博客： http://www.cnblogs.com/henryzhu/p/new-feature-in-csharp-6.html
希望对大家有帮助.
原文：http://www.cnblogs.com/QuickTechnology/p/5635155.html
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