24

我需要从任何 Url 中提取确切的域名。

例如,

网址:http ://www.google.com --> 域名:google.com

网址:http ://www.google.co.uk/path1/path2 --> 域名:google.co.uk

这在 c# 中怎么可能?该任务是否有完整的 TLD 列表或解析器?

4

5 回答 5

31

您可以使用Uri 类来访问 URI 的所有组件:

var uri = new Uri("http://www.google.co.uk/path1/path2");

var host = uri.Host;

// host == "www.google.co.uk"

但是,没有内置方法可以将子域“www”从“www.google.co.uk”中剥离。您需要实现自己的逻辑,例如

var parts = host.ToLowerInvariant().Split('.');

if (parts.Length >= 3 &&
    parts[parts.Length - 1] == "uk" &&
    parts[parts.Length - 2] == "co")
{
    var result = parts[parts.Length - 3] + ".co.uk";

    // result == "google.co.uk"
}
于 2011-05-12T20:57:50.370 回答
16

利用:

new Uri("http://www.stackoverflow.com/questions/5984361/c-sharp-getting-exact-domain-name-from-any-url?s=45faab89-43eb-41dc-aa5b-8a93f2eaeb74#new-answer").GetLeftPart(UriPartial.Authority).Replace("/www.", "/").Replace("http://", ""));

输入:

http://www.stackoverflow.com/questions/5984361/c-sharp-getting-exact-domain-name-from-any-url?s=45faab89-43eb-41dc-aa5b-8a93f2eaeb74#new-answer

输出:

stackoverflow.com

也适用于以下情况。

http://www.google.com → google.com

http://www.google.co.uk/path1/path2 → google.co.uk

http://localhost.intranet:88/path1/path2 → localhost.intranet:88

http://www2.google.com → www2.google.com

于 2012-12-07T10:57:17.093 回答
7

试试 System.Uri 类。

http://msdn.microsoft.com/en-us/library/system.uri.aspx

new Uri("http://www.google.co.uk/path1/path2").Host

返回“www.google.co.uk”。从那里它是字符串操作。:/

于 2011-05-12T20:57:53.210 回答
3

利用:

var uri =new Uri(Request.RawUrl); // to get the url from request or replace by your own
var domain = uri.GetLeftPart( UriPartial.Authority );

输入:

Url = http://google.com/?search=true&q=how+to+use+google

结果:

domain = google.com 
于 2012-04-27T17:44:37.920 回答
1

另一个没有依赖项的变体:

string GetDomainPart(string url)
{
    var doubleSlashesIndex = url.IndexOf("://");
    var start = doubleSlashesIndex != -1 ? doubleSlashesIndex + "://".Length : 0;
    var end = url.IndexOf("/", start);
    if (end == -1)
        end = url.Length;

    string trimmed = url.Substring(start, end - start);
    if (trimmed.StartsWith("www."))
        trimmed = trimmed.Substring("www.".Length );
    return trimmed;
}

例子:

http://www.google.com → google.com

http://www.google.co.uk/path1/path2 → google.co.uk

http://localhost.intranet:88/path1/path2 → localhost.intranet:88

http://www2.google.com → www2.google.com

于 2014-04-30T09:04:20.823 回答