c# - 在 .NET 中解析 URL

Question

我正在寻找可以解析 URL 的 .NET Framework 类。

一些需要解析的 URL 示例:

• server:8088
• server:8088/func1
• server:8088/func1/SubFunc1
• http://server
• http://server/func1
• http://server/func/SubFunc1
• http://server:8088
• http://server:8088/func1
• http://server:8088/func1/SubFunc1
• magnet://server
• magnet://server/func1
• magnet://server/func/SubFunc1
• magnet://server:8088
• magnet://server:8088/func1
• magnet://server:8088/func1/SubFunc1

问题是 Uri 和 UriBuilder 类没有正确处理 URL。例如，他们对以下内容感到困惑:

stackoverflow.com:8088

网址背景

Url 的格式是:

  foo://example.com:8042/over/there?name=ferret#nose
  \_/   \_________/ \__/\_________/\__________/ \__/
   |         |        |     |           |        |
scheme      host    port   path       query   fragment

在我们的例子中，我们只关心:

• Uri.Scheme
• Uri.Host
• Uri.Port
• Uri.Path

测试

运行一些测试，我们可以检查 UriBuilder 类如何处理各种 Uri:

                                        Expected  Expected Expected    Expected
//Test URI                               Scheme    Server    Port        Path
//=====================================  ========  ========  ====  ====================
t("server",                              "",       "server", -1,   "");
t("server/func1",                        "",       "server", -1,   "/func1");
t("server/func1/SubFunc1",               "",       "server", -1,   "/func1/SubFunc1");
t("server:8088",                         "",       "server", 8088, "");
t("server:8088/func1",                   "",       "server", 8088, "/func1");
t("server:8088/func1/SubFunc1",          "",       "server", 8088, "/func1/SubFunc1");
t("http://server",                       "http",   "server", -1,   "/func1");
t("http://server/func1",                 "http",   "server", -1,   "/func1");
t("http://server/func/SubFunc1",         "http",   "server", -1,   "/func1/SubFunc1");
t("http://server:8088",                  "http",   "server", 8088, "");
t("http://server:8088/func1",            "http",   "server", 8088, "/func1");
t("http://server:8088/func1/SubFunc1",   "http",   "server", 8088, "/func1/SubFunc1");
t("magnet://server",                     "magnet", "server", -1,   "");
t("magnet://server/func1",               "magnet", "server", -1,   "/func1");
t("magnet://server/func/SubFunc1",       "magnet", "server", -1,   "/func/SubFunc1");
t("magnet://server:8088",                "magnet", "server", 8088, "");
t("magnet://server:8088/func1",          "magnet", "server", 8088, "/func1");
t("magnet://server:8088/func1/SubFunc1", "magnet", "server", 8088, "/func1/SubFunc1");

除六个案异常(exception)，所有案例都无法正确解析:

Url                                  Scheme  Host    Port  Path
===================================  ======  ======  ====  ===============
server                               http    server  80    /
server/func1                         http    server  80    /func1
server/func1/SubFunc1                http    server  80    /func1/SubFunc1
server:8088                          server          -1    8088
server:8088/func1                    server          -1    8088/func1
server:8088/func1/SubFunc1           server          -1    8088/func1/SubFunc1
http://server                        http    server  80    /
http://server/func1                  http    server  80    /func1
http://server/func/SubFunc1          http    server  80    /func1/SubFunc1
http://server:8088                   http    server  8088  /
http://server:8088/func1             http    server  8088  /func1
http://server:8088/func1/SubFunc1    http    server  8088  /func1/SubFunc1
magnet://server                      magnet  server  -1    /
magnet://server/func1                magnet  server  -1    /func1
magnet://server/func/SubFunc1        magnet  server  -1    /func/SubFunc1
magnet://server:8088                 magnet  server  8088  /
magnet://server:8088/func1           magnet  server  8088  /func1
magnet://server:8088/func1/SubFunc1  magnet  server  8088  /func1/SubFunc1

我说我想要一个 .NET Framework 类。我也愿意接受任何我可以捡起来咀嚼的口香糖。只要它满足我简单的测试用例。

奖金聊天

我正在考虑扩展 this question ，但该问题仅限于 http。

我也问过这个same question earlier today , 但我现在意识到我措辞不正确。我错误地询问了如何“构建” 一个 url。实际上，我想“解析” 用户输入的 URL。我现在不能回去从根本上改变标题。所以我会再次问同样的问题，只是更好，更明确的目标，在这里。

红利阅读

• How can I parse HTTP urls in C#?
• How to build a Url?

Answer 1

这个正则表达式行吗？

^((?<schema>[a-z]*)://)?(?<host>[^/:]*)?(:(?<port>[0-9]*))?(?<path>/.*)?$

它并不完美，但它似乎适用于您的测试用例。