HOW TO：在 ASP.NET Web 網頁中偵測瀏覽器類型

更新：2007 年 11 月

不同的瀏覽器和不同版本的相同瀏覽器，可支援不同的功能。在您的應用程式中，您可能需要判斷使用者是使用哪種類型的瀏覽器檢視網頁，或是判斷瀏覽器是否支援某些功能。

注意事項：
ASP.NET 可以自動判斷瀏覽器能力，並使用此資訊來呈現 ASP.NET 伺服器控制項的適當 HTML 標記。如需詳細資訊，請參閱 ASP.NET 伺服器控制項和瀏覽器能力。

若要在 ASP.NET Web 網頁中偵測瀏覽器類型

• 查詢 Browser 屬性，其中包含 HttpBrowserCapabilities 物件。這個物件在 HTTP 要求中從瀏覽器或用戶端裝置取得資訊，告訴應用程式瀏覽器或用戶端裝置所提供支援的類型和層級。這個物件接著會使用強型別 (Strongly Typed) 屬性和泛型名稱/值字典，公開 (Expose) 關於瀏覽器能力的資訊。

  在下列程式碼範例中，示範了如何在網頁的文字方塊中顯示瀏覽器資訊。

  注意事項：
  HttpBrowserCapabilities 物件所公開的屬性會指出瀏覽器的固有能力，但是不一定會反映目前的瀏覽器設定。例如，Cookies 屬性會指出瀏覽器是否原本就支援 Cookie，但不會指出提出要求的瀏覽器是否已啟用 Cookie。如需詳細資訊，請參閱 ASP.NET Cookie 概觀。

  Private Sub Button1_Click(ByVal sender As System.Object, _
         ByVal e As System.EventArgs) Handles Button1.Click
      Dim s As String = ""
      With Request.Browser
          s &= "Browser Capabilities" & vbCrLf
          s &= "Type = " & .Type & vbCrLf
          s &= "Name = " & .Browser & vbCrLf
          s &= "Version = " & .Version & vbCrLf
          s &= "Major Version = " & .MajorVersion & vbCrLf
          s &= "Minor Version = " & .MinorVersion & vbCrLf
          s &= "Platform = " & .Platform & vbCrLf
          s &= "Is Beta = " & .Beta & vbCrLf
          s &= "Is Crawler = " & .Crawler & vbCrLf
          s &= "Is AOL = " & .AOL & vbCrLf
          s &= "Is Win16 = " & .Win16 & vbCrLf
          s &= "Is Win32 = " & .Win32 & vbCrLf
          s &= "Supports Frames = " & .Frames & vbCrLf
          s &= "Supports Tables = " & .Tables & vbCrLf
          s &= "Supports Cookies = " & .Cookies & vbCrLf
          s &= "Supports VBScript = " & .VBScript & vbCrLf
          s &= "Supports JavaScript = " & _
              .EcmaScriptVersion.ToString() & vbCrLf
          s &= "Supports Java Applets = " & .JavaApplets & vbCrLf
          s &= "Supports ActiveX Controls = " & .ActiveXControls & _
              vbCrLf
      End With
      TextBox1.Text = s
  End Sub
  

  private void Button1_Click(object sender, System.EventArgs e)
  {
      System.Web.HttpBrowserCapabilities browser = Request.Browser;
      string s = "Browser Capabilities\n"
          + "Type = "                    + browser.Type + "\n"
          + "Name = "                    + browser.Browser + "\n"
          + "Version = "                 + browser.Version + "\n"
          + "Major Version = "           + browser.MajorVersion + "\n"
          + "Minor Version = "           + browser.MinorVersion + "\n"
          + "Platform = "                + browser.Platform + "\n"
          + "Is Beta = "                 + browser.Beta + "\n"
          + "Is Crawler = "              + browser.Crawler + "\n"
          + "Is AOL = "                  + browser.AOL + "\n"
          + "Is Win16 = "                + browser.Win16 + "\n"
          + "Is Win32 = "                + browser.Win32 + "\n"
          + "Supports Frames = "         + browser.Frames + "\n"
          + "Supports Tables = "         + browser.Tables + "\n"
          + "Supports Cookies = "        + browser.Cookies + "\n"
          + "Supports VBScript = "       + browser.VBScript + "\n"
          + "Supports JavaScript = "     + 
              browser.EcmaScriptVersion.ToString() + "\n"
          + "Supports Java Applets = "   + browser.JavaApplets + "\n"
          + "Supports ActiveX Controls = " + browser.ActiveXControls 
                + "\n";
      TextBox1.Text = s;
  }
  

請參閱

概念

ASP.NET Web 伺服器控制項和瀏覽器能力