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?
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"
}
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
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。:/
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
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