确定绝对或相对URL [英] Determine if Absolute or Relative URL

问题描述

我在字符串中有一个相对或绝对URL.我首先需要知道它是绝对的还是相对的.我该怎么做呢?然后，我想确定url的域是否在允许列表中.

I have a relative or absolute url in a string. I first need to know whether it is absolute or relative. How do I do this? I then want to determine if the domain of the url is in an allow list.

这是我的允许列表，例如:

Here is my allow list, as an example:

string[] Allowed =
{
   "google.com",
   "yahoo.com",
   "espn.com"
}

一旦我知道它是相对的还是绝对的，我就认为它相当简单:

Once I know whether its relative or absolute, its fairly simple I think:

if (Url.IsAbsolute)
{
    if (!Url.Contains("://"))
        Url = "http://" + Url;

    return Allowed.Contains(new Uri(Url).Host);
}
else //Is Relative
{
    return true;
}

推荐答案

bool IsAbsoluteUrl(string url)
{
    Uri result;
    return Uri.TryCreate(url, UriKind.Absolute, out result);
}

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