在 C#/.NET 中获取 url 的域名
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Get domain name of a url in C# / .NET
提问by Computer User
The code:
编码：
string sURL = "http://subdomain.website.com/index.htm";
MessageBox.Show(new System.Uri(sURL).Host);
gives me "subdomain.website.com"
给我“subdomain.website.com”
But I need the main domain "website.com" for any url or web link.
但是我需要主域“website.com”作为任何 url 或 web 链接。
How do I do that?
我怎么做？
采纳答案by p.s.w.g
You can do this to get just the last two segments of the host name:
您可以这样做以获取主机名的最后两个部分：
string[] hostParts = new System.Uri(sURL).Host.Split('.');
string domain = String.Join(".", hostParts.Skip(Math.Max(0, hostParts.Length - 2)).Take(2));
Or this:
或这个：
var host = new System.Uri(sURL).Host;
var domain = host.Substring(host.LastIndexOf('.', host.LastIndexOf('.') - 1) + 1);
This method will find include at least two domain name parts, but will also include intermediate parts of two characters or less:
这种方法会发现至少包含两个域名部分，但也会包含两个或更少字符的中间部分：
var host = new System.Uri(sURL).Host;
int index = host.LastIndexOf('.'), last = 3;
while (index > 0 && index >= last - 3)
{
last = index;
index = host.LastIndexOf('.', last - 1);
}
var domain = host.Substring(index + 1);
This will handle domains such as localhost, example.com, and example.co.uk. It's not the best method, but at least it saves you from constructing a giant list of top-level domains.
这将处理领域，如localhost，example.com和example.co.uk。这不是最好的方法，但至少它使您免于构建庞大的顶级域列表。
回答by Marvin W
Try regular expression?
试试正则表达式？
using System.Text.RegularExpressions;
string sURL = "http://subdomain.website.com/index.htm";
string sPattern = @"\w+.com";
// Instantiate the regular expression object.
Regex r = new Regex(sPattern, RegexOptions.IgnoreCase);
// Match the regular expression pattern against a text string.
Match m = r.Match(sUrl);
if (m.Success)
{
MessageBox.Show(m.Value);
}
回答by 2power10
You can try this. This can handle many kind of root domain if you define it in an array.
你可以试试这个。如果您在数组中定义它，这可以处理多种根域。
string sURL = "http://subdomain.website.com/index.htm";
var host = new System.Uri(sURL).Host.ToLower();
string[] col = { ".com", ".cn", ".co.uk"/*all needed domain in lower case*/ };
foreach (string name in col)
{
if (host.EndsWith(name))
{
int idx = host.IndexOf(name);
int sec = host.Substring(0, idx - 1).LastIndexOf('.');
var rootDomain = host.Substring(sec + 1);
}
}
