C# 使用WebClient时，在多网卡IP时，指定IP发送Web请求

需要定义一个类，重写GetWebRequest，在方法内，指定IP地址

 

    public class MyWebClient : WebClient { private IPAddress ipAddress; public MyWebClient(IPAddress ipAddress) { this.ipAddress = ipAddress; } protected override WebRequest GetWebRequest(Uri address) { WebRequest request = (WebRequest)base.GetWebRequest(address); ((HttpWebRequest)request).ServicePoint.BindIPEndPointDelegate += (servicePoint, remoteEndPoint, retryCount) => { return new IPEndPoint(ipAddress, 0); }; return request; } }

 

使用时，  在实例化构造函数中传入所需IP即可