DotNet获取客户端的IP地址

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public static string GetClientIpAddress(HttpRequestMessage request)
{
    if (request.Properties.ContainsKey(HttpContext))
    {
        dynamic ctx = request.Properties[HttpContext];
        if (ctx != null)
        {
            return ctx.Request.UserHostAddress;
        }
    }
    if (request.Properties.ContainsKey(RemoteEndpointMessage))
    {
        dynamic remoteEndpoint = request.Properties[RemoteEndpointMessage];
        if (remoteEndpoint != null)
        {
            return remoteEndpoint.Address;
        }
    }
    if (request.Properties.ContainsKey(OwinContext))
    {
        dynamic ctx = request.Properties[OwinContext];
        if (ctx != null)
        {
            return ctx.Request.RemoteIpAddress;
        }
    }
    return null;
}

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