C#入门小程序ZHP_07.doc

C#入门小程序集锦七这个集锦来源于我开始接触C#时所分析过的一些小程序和一些自己设计的小程序，我是从.NET Framework v2.0 SDK开始的，所以一开始的程序各个.NET版本都能够运行。提醒：一是编程环境往往具有向下兼容性，所以前面程序中的某些注释说明在.NET2.0中是正确的，而在v4.0等版本却是错误的，例如_03中“接口的属性或索引器如下：必须带有至少一个访问器”在.NET4.0中就可以不带访问器；二是这个集锦的作用并不是帮助学习，而是为了总结和查询的，所以内容上并不存在连续性，程序时简时杂，注释也不是为了说明，而是为了提醒。综上所述，请各位按自己的需要查看集锦文档。抓包库SharpPcap的简单应用之一：/SharpPcap应用：将WinPcap包装后的C#抓包库。/SharpPcap只有抓取和发送packet的能力，而没有阻断的功能。/运行环境：.NET4.0 、 SharpPcap4.2（引用）using System;using System.Collections.Generic;using System.Linq;using System.Text;using SharpPcap;using SharpPcap.LibPcap;using SharpPcap.WinPcap;using SharpPcap.AirPcap;using System.Net;namespace ConsoleApplication1 class Program static void Main(string args) /显示当前SharpPcap版本号，没意义。 string str = SharpPcap.Version.VersionString; Console.WriteLine(该SharpPcap的版本号为：0,str); /获取并显示抓包device的列表，然后从列表中选择想要用于抓取packet的device var devices = CaptureDeviceList.Instance; if(devices.Count 1t2,i,dev.Name,dev.Description); i+; Console.WriteLine(nPlease choose a device for sending the ARP request;); string s = Console.ReadLine(); i = int.Parse(s); var device = devicesi; /ARP类获取对应IP的MAC地址，测试无效 /*IPAddress ip; while(true) Console.WriteLine(-Please enter IP address to be resolved by ARP:); if(IPAddress.TryParse(Console.ReadLine(),out ip) break; Console.WriteLine(Bad IP address format,please try again.); ARP arper = new ARP(device); var resolvedMacAddress = arper.Resolve(ip); if (resolvedMacAddress = null) Console.WriteLine(Timeout,no mac address found for ip of + ip);/为什么总是这个 else Console.WriteLine(ip+is at: +arper.Resolve(ip); Console.WriteLine(ENTER); Console.ReadLine();*/ /OnPacketArrival事件处理 device.OnPacketArrival += new PacketArrivalEventHandler(device_OnPacketArrival); /抓packet的时间间隔 int readTimeoutMilliseconds = 1000; /判定device的类型，然后开启device if(device is AirPcapDevice) var airPcap = device as AirPcapDevice; airPcap.Open(SharpPcap.WinPcap.OpenFlags.DataTransferUdp,readTimeoutMilliseconds); else if(device is WinPcapDevice) var winPcap = device as WinPcapDevice; winPcap.Open(SharpPcap.WinPcap.OpenFlags.DataTransferUdp|SharpPcap.WinPcap.OpenFlags.NoCaptureLocal,readTimeoutMilliseconds); else if (device is LibPcapLiveDevice) var livePcapDevice = device as LibPcapLiveDevice; livePcapDevice.Open(DeviceMode.Promiscuous, readTimeoutMilliseconds); else throw new System.InvalidOperationException(unknow device type of +device.GetType().ToString(); Console.WriteLine(n-Listening on 0 1,hit Enter to exit,device.Name,device.Description); /开启抓包 device.StartCapture(); Console.ReadLine(); /抓包结束 device.StopCapture(); Console.WriteLine(-Capture stopped.); Console.WriteLine(device.Statistics.ToString(); device.Close(); Console.WriteLine(nnPlease hit Enter to exit.); Console.ReadLine(); /将抓获的packet的Date、Length public static void device_OnPacketArrival(object sender,CaptureEventArgs e) var time = e.Packet.Timeval.Date; var len =