挑战：优雅地将子域名前缀为URL [英] Challenge: Elegantly Prefix Subdomain To URL

问题描述

答案可以是C＃或VB.NET。这是挑战。将 http://blog.site.com/path/page.aspx 转换为 http://mobile.blog.site.com/path /page.aspx 使用最优雅的方法。我自己可以这样做，但我想你们中的一个人可能会想出一些比我想象的更聪明的东西。



这里有一些规则：

• 避免硬编码字符串。 http，移动，博客，网站，路径和页面可能都会发生变化，因此您无法使用 string.Replace （）。
• site.com将更改为mobile.site.com。 myapp.blog.site.com将更改为mobile.myapp.blog.site.com。
• 尝试使用现有的.Net类（例如， System.UriBuilder ）而不是重新发明轮子。
• 如果您的解决方案在某种程度上比已发布的其他解决方案更好，也可以发布您的解决方案！

The answer can be in C# or VB.NET. Here's the challenge. Transform http://blog.site.com/path/page.aspx into http://mobile.blog.site.com/path/page.aspx using the most elegant method possible. I can do this myself, but I think one of you may come up with something more clever than I have thought of so far.

Here are some rules:


• Avoid hardcoding strings. "http", "mobile", "blog", "site", "path", and "page" may all change, so you can't use those with, say, string.Replace().
• "site.com" would change to "mobile.site.com". "myapp.blog.site.com" would change to "mobile.myapp.blog.site.com".
• Try to make use of existing .Net classes (e.g., System.UriBuilder) rather than reinventing the wheel.
• If your solution is better in some way than the other solutions already posted, post yours too!

private string PrefixSubdomain(string subdomain)
{
    var builder = new System.UriBuilder(Request.Url.ToString());
    // ...
}








Private Function PrefixSubdomain(subdomain As String) As String
	Dim builder As New System.UriBuilder(Request.Url.ToString())
	' ...
End Function



你不需要使用 UriBuilder ！例如，您可以使用正则表达式（虽然根据我的标准可能不那么优雅）。


You needn't use UriBuilder! You could instead, for example, use a regular expression (though that may be less elegant by my standards).

推荐答案

private string PrefixSubDomain(string subDomain)
{
    // split the string
    string[] parts =  Request.Url.ToString().Split('/');
    // create a StringBuilder to economize overhead - init with 
    // the first element of the split string array
    StringBuilder newPath = new StringBuilder(parts[0]);
    // now process the remaining array elements
    for (int i = 1; i < parts.Length; i++)
    {
        if (i == 2)
        {
            newPath.AppendFormat("/{0}", subDomain);
            if (subDomain.EndsWith("."))
            {
                newPath.Append(parts[i]);
            }
            else
            {
                newPath.AppendFormat(".{0}", parts[i]);
            }
        }
        else
        {
            newPath.AppendFormat("/{0}", (string.IsNullOrEmpty(parts[i]) ? "" : parts[i]));
        }
    }
    return newPath.ToString();
}





对所有版本感到抱歉。当我想到的时候，我正在修理。



Sorry about all the revisions. I was fixing as I thought of stuff.




private string PrefixSubdomain(string subdomain)
{
    var builder = new UriBuilder(Request.Url);
    builder.Host = subdomain + "." + builder.Host;
    return builder.Uri.ToString();
}



我真的不喜欢我使用字符串常量（。）。除此之外，这是我能想到的最优雅的代码。


I don't really like that I am using a string constant ("."). Other than that, this is the most elegant code I could come up with.




var subDomain = "donation";

   var builder = new UriBuilder(Request.Url.AbsoluteUri);
   var host = builder.Host;
   string[] parts = host.Split('.');
   if (parts.Length > 2)
   {
       //there is sub
       parts[0] = subDomain;
   }
   //merge 'em
   host ="";
   for (int i = 0; i < parts.Length; i++)
   {
       host += parts[i];
   }
   builder.Host = host;




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