C# 使用WebClient時，在多網卡時，指定IP發送Web請求

須要定義一個類，重寫GetWebRequest，在方法內，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; } }

 

使用時，  在實例化構造函數中傳入所需IP便可