如何在沒有碎片的情況下創建Uri（將＃轉換爲％23）

Question

我試圖通過使用查詢字符串進行高級搜索，但是當我包含＃它在創建uri時未轉換爲％23。

var webAddress = "www.worldwideweb.com/abc#d#e"; 
var uri = new Uri(webAddress).AbsoluteUri; 

當我這樣做時，會引發異常。 當我只包含一個＃符號時，它將它分割。就像這個例子

var webAddress = "https://api.stackexchange.com/2.2/search/advanced?site=stackoverflow&q=[c#] OR [java]" 
var uri = new Uri(webAddress).AbsoluteUri; 

烏里現在等於

https://api.stackexchange.com/2.2/search/advanced?site=stackoverflow&q=[c#]%20OR%20[java]

如何使

https://api.stackexchange.com/2.2/search/advanced?site=stackoverflow&q=[c#] OR [f#]

到

https://api.stackexchange.com/2.2/search/advanced?site=stackoverflow&q=[c%23]%20OR%20[f%23]

我使用.NET Framework 4.6.2

Answer 1

我的方法是對每個Query參數使用UriBuilder和一個字典。然後您可以從每個參數中獲取值UrlEncode，以便您獲得有效的Url。

這是你的代碼是什麼樣子：

var ub = new UriBuilder("https", "api.stackexchange.com"); 
ub.Path = "/2.2/search/advanced"; 
// query string parameters 
var query = new Dictionary<string,string>(); 
query.Add("site", "stackoverflow"); 
query.Add("q", "[c#] OR [f#]"); 
query.Add("filter", "!.UE46gEJXV)W0GSb"); 
query.Add("page","1"); 
query.Add("pagesize","2"); 

// iterate over each dictionary item and UrlEncode the value 
ub.Query = String.Join("&", 
    query.Select(kv => kv.Key + "=" + WebUtility.UrlEncode(kv.Value))); 

var wc = new MyWebClient(); 
wc.DownloadString(ub.Uri.AbsoluteUri).Dump("result"); 

這將導致以下鏈接在ub.Uri.AbsoluteUri：

https://api.stackexchange.com/2.2/search/advanced?site=stackoverflow&q=%5Bc%23%5D+OR+%5Bf%23%5D&filter=!.UE46gEJXV)W0GSb&page=1&pagesize=2

由於StackAPI返回的內容壓縮，對子類WebClient使用AutomaticDecompression（如here，feroze ）：

class MyWebClient:WebClient 
{ 
    protected override WebRequest GetWebRequest(Uri uri) 
    { 
     var wr = base.GetWebRequest(uri) as HttpWebRequest; 
     wr.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; 
     return wr; 
    } 
} 

，當與其他代碼相結合，對我產生輸出：

{ 
    "items" : [{ 
      "tags" : ["c#", "asp.net-mvc", "iis", "web-config"], 
      "last_activity_date" : 1503056272, 
      "question_id" : 45712096, 
      "link" : "https://stackoverflow.com/questions/45712096/can-not-read-web-config-file", 
      "title" : "Can not read web.config file" 
     }, { 
      "tags" : ["c#", "xaml", "uwp", "narrator"], 
      "last_activity_date" : 1503056264, 
      "question_id" : 45753140, 
      "link" : "https://stackoverflow.com/questions/45753140/narrator-scan-mode-for-textblock-the-narrator-reads-the-text-properties-twice", 
      "title" : "Narrator. Scan mode. For TextBlock the narrator reads the Text properties twice" 
     } 
    ] 
} 

Answer 2

如果#只有在查詢部分存在，你可以簡單地這樣做：

var webAddress = "https://api.stackexchange.com/2.2/search/advanced?site=stackoverflow&q=[c#] OR [java]" 
var uri = new Uri(webAddress).AbsoluteUri; 
var fixedUri = Regex.Replace(uri, "#", "%23");