在用于WebAPI和WebApplication的通用c＃类库中获取客户端的IP地址

Question

我的业务层对于WebApi和WebApplication很常见。需要跟踪每个操作的客户端IP地址。在网络上搜索并尝试了此操作，但是在开发中尝试了此操作，但我认为这是针对Server的。我正在获取服务器的IP地址：

var host = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName());
string ipAddress = host.AddressList[1].ToString();

Answer 1

您可以尝试以下扩展方法：

public static class HttpContextExtensions
    {
        public static string GetIpAddress(this HttpContext httpContext)
        {
            try
            {
                return httpContext.Connection.RemoteIpAddress.ToString();
            }
            catch
            {
                return string.Empty;
            }
        }
    }

旧版.Net版本示例：

/// <summary>
        /// Gets the IP address for the current request, returns 0.0.0.0 if HttpsContext does not exist.
        /// </summary>
        /// <returns></returns>
        public static string GetIpAddress()
        {
            var context = HttpContext.Current;
            var ipAddress = String.Empty;

            if (context != null)
            {
                ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

                if (String.IsNullOrWhiteSpace(ipAddress))
                {
                    ipAddress = context.Request.ServerVariables["REMOTE_ADDR"];
                }
                else
                {
                    var ipAddresses = ipAddress.Split(new [] {','}, StringSplitOptions.RemoveEmptyEntries);
                    if (ipAddresses.Length > 0)
                    {
                        ipAddress = ipAddresses[0];
                    }
                }

                ipAddress = String.IsNullOrWhiteSpace(ipAddress) ? context.Request.UserHostName : ipAddress;
            }
            return String.IsNullOrWhiteSpace(ipAddress) ? "0.0.0.0" : ipAddress;
        }