如何获取WCF远程端点的IP地址？

using System.ServiceModel.Channels;
using System.ServiceModel.OperationContext;

public string GetClientIpAddress()
{
    OperationContext context = OperationContext.Current;
    MessageProperties messageProperties = context.IncomingMessageProperties;
    RemoteEndpointMessageProperty endpointProperty = messageProperties[RemoteEndpointMessageProperty.Name] as RemoteEndpointMessageProperty;
    string clientIpAddress = endpointProperty.Address;
    return clientIpAddress;
}

using System.Web.HttpContext;

public string GetClientIpAddress()
{
    HttpContext context = HttpContext.Current;
    string clientIpAddress = context.Request.UserHostAddress;
    return clientIpAddress;
}

using System.ServiceModel;

public string GetClientIpAddress()
{
    ServiceSecurityContext context = ServiceSecurityContext.Current;
    string clientIpAddress = context.PrimaryIdentity.Name;
    return clientIpAddress;
}