是什么Request.UserHostAddress和Request.ServerVariables [＆QUOT; REMOTE_ADDR＆QUOT]之间的差。的ToString（） [英] What is the difference between Request.UserHostAddress and Request.ServerVariables["REMOTE_ADDR"].ToString()

问题描述

在这里，我可以使用的这2种方法。有什么区别，我应该使用哪一个？

方法1：

 字符串srUserIp =;
    尝试
    {
        srUserIp = HttpContext.Current.Request.ServerVariables [REMOTE_ADDR]的ToString（）。
    }
    抓住
    {    }
 

方法2：

 字符串srUserIp =;
    尝试
    {
        srUserIp = Request.UserHostAddress.ToString（）;
    }
    抓住
    {    }
 

解决方案

简短的回答：这两个是相同的。

龙答：：要确定两个使用反射镜（或任何反汇编您preFER）之间的差值

在code为的Htt prequest.UserHostAddress 属性如下：

 公共字符串UserHostAddress
{
    得到
    {
        如果（this._wr！= NULL）
        {
            返回this._wr.GetRemoteAddress（）;
        }
        返回null;
    }
}
 

请注意，它返回 _wr.GetRemoteAddress（）。在 _wr 变量是的HttpWorkerRequest 对象的实例。有从的HttpWorkerRequest 派生不同类别和一个用来取决于您使用的是IIS 6，IIS 7或超越，和其他一些因素的影响，但所有的人你将使用Web应用程序具有相同的code为 GetRemoteAddress（），即：

 公众覆盖字符串GetRemoteAddress（）
{
    返回this.GetServerVariable（REMOTE_ADDR）;
}
 

正如你所看到的， GetRemoteAddress（）直接返回服务器变量 REMOTE_ADDR 。

至于用哪一个，我建议在 UserHostAddress 财产既然是不依赖于神奇的字符串。

快乐编程

Here I can use either of these 2 methods. What are the differences and which one should I use?

Method 1:

    string srUserIp = "";
    try
    {
        srUserIp = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
    }
    catch
    {

    }

Method 2:

    string srUserIp = "";
    try
    {
        srUserIp = Request.UserHostAddress.ToString();
    }
    catch
    {

    }

解决方案

Short answer: The two are identical.

Long answer: To determine the difference between the two use Reflector (or whatever disassembler you prefer).

The code for the HttpRequest.UserHostAddress property follows:

public string UserHostAddress
{
    get
    {
        if (this._wr != null)
        {
            return this._wr.GetRemoteAddress();
        }
        return null;
    }
}

Note that it returns _wr.GetRemoteAddress(). The _wr variable is an instance of an HttpWorkerRequest object. There are different classes derived from HttpWorkerRequest and which one is used depends on whether you are using IIS 6, IIS 7 or beyond, and some other factors, but all of the ones you would be using in a web application have the same code for GetRemoteAddress(), namely:

public override string GetRemoteAddress()
{
    return this.GetServerVariable("REMOTE_ADDR");
}

As you can see, GetRemoteAddress() simply returns the server variable REMOTE_ADDR.

As far as which one to use, I'd suggest the UserHostAddress property since is doesn't rely on "magic strings."

Happy Programming

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