在Uri

Question

使用.NET替换URI的主机零件的最佳方法是什么？

I.E。：

string ReplaceHost(string original, string newHostName);
//...
string s = ReplaceHost("http://oldhostname/index.html", "newhostname");
Assert.AreEqual("http://newhostname/index.html", s);
//...
string s = ReplaceHost("http://user:pass@oldhostname/index.html", "newhostname");
Assert.AreEqual("http://user:pass@newhostname/index.html", s);
//...
string s = ReplaceHost("ftp://user:pass@oldhostname", "newhostname");
Assert.AreEqual("ftp://user:pass@newhostname", s);
//etc.

System.uri似乎没有太大帮助。

Answer 1

System.uribuilder

是您所追求的...

string ReplaceHost(string original, string newHostName) {
    var builder = new UriBuilder(original);
    builder.Host = newHostName;
    return builder.Uri.ToString();
}

Answer 2

// the URI for which you want to change the host name
var oldUri = Request.Url;

// create a new UriBuilder, which copies all fragments of the source URI
var newUriBuilder = new UriBuilder(oldUri);

// set the new host (you can set other properties too)
newUriBuilder.Host = "newhost.com";

// get a Uri instance from the UriBuilder
var newUri = newUriBuilder.Uri;

Answer 3

这是我用来处理这种常见情况的精致代码：

public static Uri ReplaceHost(Uri original, string newHostName)
{
    var builder = new UriBuilder(original);
    var newhost = new Uri(newHostName.Contains("://") ? newHostName : "http://" + newHostName);
    builder.Host = newhost.Host;
    builder.Port = newhost.Port == 80 ? builder.Port : newhost.Port;
    return builder.Uri;
}

注意，如果您不指定新端口，则保留旧端口