ASP.NET Web Form-偵測用戶端瀏覽器類型與支援的功能

其實，進入HTML5的時代有那麼多響應式網頁設計的模組可以使用，只要設計得當，前端界面應該不太需要做特殊判斷，至於後端...總會有些奇奇怪怪的情況來考驗，雖然困擾了幾天，最後這些資料沒派上用場XDDD

不過資料都收集了，就稍加整理做為這次被考驗的紀念...

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偵測用戶端瀏覽器屬性在前端可以用javascript達成，例如：

alert(navigator.userAgent);

有時必須在後端做判斷，(ASP.NET WebForm)可以取 Requset.UserAgent的值，
更細節的支援功能則可使用HttpRequest.Browser

How to: Detect Browser Types and Browser Capabilities in ASP.NET Web Forms

必須注意的是HttpBrowserCapabilities 提供的是用戶端瀏覽器所支援的功能，而不是用戶端瀏覽器的設定值。

想要將用戶端瀏覽器支援的功能呈現在網頁上，MSDN提供的範例是：

HttpBrowserCapabilities bc = Request.Browser;
Response.Write("<p>Browser Capabilities:</p>");
Response.Write("Type = " + bc.Type + "<br>");
Response.Write("Name = " + bc.Browser + "<br>");
Response.Write("Version = " + bc.Version + "<br>");
Response.Write("Major Version = " + bc.MajorVersion + "<br>");
Response.Write("Minor Version = " + bc.MinorVersion + "<br>");
Response.Write("Platform = " + bc.Platform + "<br>");
Response.Write("Is Beta = " + bc.Beta + "<br>");
Response.Write("Is Crawler = " + bc.Crawler + "<br>");
Response.Write("Is AOL = " + bc.AOL + "<br>");
Response.Write("Is Win16 = " + bc.Win16 + "<br>");
Response.Write("Is Win32 = " + bc.Win32 + "<br>");
Response.Write("Supports Frames = " + bc.Frames + "<br>");
Response.Write("Supports Tables = " + bc.Tables + "<br>");
Response.Write("Supports Cookies = " + bc.Cookies + "<br>");
Response.Write("Supports VB Script = " + bc.VBScript + "<br>");
Response.Write("Supports JavaScript = " + bc.JavaScript + "<br>");
Response.Write("Supports Java Applets = " + bc.JavaApplets + "<br>");
Response.Write("Supports ActiveX Controls = " + bc.ActiveXControls + "<br>");
Response.Write("CDF = " + bc.CDF + "<br>");

將該範例稍做修改列出支援的全部功能：

HttpBrowserCapabilities bc = Request.Browser;
Response.Write("Browser Capabilities:");
foreach(string k in bc.Capabilities.Keys)
{
   Response.Write(k + " = " + bc.Capabilities[k] + "<br>");
}
Response.Write("user agent = " + Request.UserAgent);