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【笨問題】C# 相對網址與絕對網址轉換
source link: https://blog.darkthread.net/blog/resolve-relative-url-w-csharp/
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【笨問題】C# 相對網址與絕對網址轉換
2021-06-15 08:40 PM 
1 
1,130 在網頁使用相對網址，瀏覽器會自動幫忙轉成絕對網址，如果是在 C# 程式寫程式推算，該怎麼寫？
一開始我又用傳統思維開始想演算法，先轉成 Uri 物件解析出 Host、PathAndQuery 再算位置弄半天，後來發現自己耍笨了，Uri 建構式已直接支援。
public Uri (Uri baseUri, string? relativeUri);
紀念白忙一場，寫範例驗證兼筆記：
void Main()
{
var tests = new List<string>() {
"https://store.darkthread.net/shopping/cart",
"https://store.darkthread.net/shopping/cart/",
"https://store.darkthread.net/shopping/cart/view",
"https://store.darkthread.net/shopping/cart/view?f=24h",
"https://store.darkthread.net/shopping/cart/view.aspx?f=24h"
};
Action<string> test = (relUrl) =>
{
Console.WriteLine($"Testing [{relUrl}] ...");
tests.ForEach(baseUrl => {
var u = new Uri(new Uri(baseUrl), relUrl);
Console.WriteLine(u.ToString());
});
};
test("../help/contact");
test(".");
test("..");
test("?sort=prz#summary");
}
同場加映，如果是絕對轉相對怎麼辦？public Uri MakeRelativeUri (Uri uri); 以前計算檔案路徑時用過，用在網址當然沒問題。
關於 Uri 各部分解析，推薦保哥的這篇：講解 URL 結構與分享幾個相對路徑與絕對路徑的開發技巧，你可能會有一些新發現。
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- C#
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