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如何：偵測有無安裝 .NET Framework 3.0

系統管理員必須先確認 NET Framework 運行時間存在，系統管理員才能在系統上部署Microsoft .NET Framework 應用程式。 本主題提供以 HTML/JavaScript 撰寫的腳本，系統管理員可用來判斷 NET Framework 是否存在於系統上。

備註

如需有關安裝、部署及偵測 Microsoft .NET Framework 的詳細資訊，請參閱部署Microsoft .NET Framework 3.0 版中的討論。

偵測「.NET CLR」使用者代理程式字串

安裝NET Framework時，MSI會將“.NET CLR”和版本號碼新增至UserAgent字串。 下列範例顯示內嵌在簡單 HTML 頁面中的指令碼。 腳本會搜尋 UserAgent 字串，以判斷是否已安裝 .NET Framework，並在搜尋結果上顯示狀態訊息。

<HTML>
  <HEAD>
    <TITLE>Test for the .NET Framework 3.0</TITLE>
    <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8" />
    <SCRIPT LANGUAGE="JavaScript">
    <!--
    var dotNETRuntimeVersion = "3.0.04425.00";

    function window::onload()
    {
      if (HasRuntimeVersion(dotNETRuntimeVersion))
      {
        result.innerText =
          "This machine has the correct version of the .NET Framework 3.0: "
          + dotNETRuntimeVersion
      }
      else
      {
        result.innerText =
          "This machine does not have the correct version of the .NET Framework 3.0."
      }
      result.innerText += "\n\nThis machine's userAgent string is: " +
        navigator.userAgent + ".";
    }

    //
    // Retrieve the version from the user agent string and
    // compare with the specified version.
    //
    function HasRuntimeVersion(versionToCheck)
    {
      var userAgentString =
        navigator.userAgent.match(/.NET CLR [0-9.]+/g);

      if (userAgentString != null)
      {
        var i;

        for (i = 0; i < userAgentString.length; ++i)
        {
          if (CompareVersions(GetVersion(versionToCheck),
            GetVersion(userAgentString[i])) <= 0)
            return true;
        }
      }

      return false;
    }

    //
    // Extract the numeric part of the version string.
    //
    function GetVersion(versionString)
    {
      var numericString =
        versionString.match(/([0-9]+)\.([0-9]+)\.([0-9]+)/i);
      return numericString.slice(1);
    }

    //
    // Compare the 2 version strings by converting them to numeric format.
    //
    function CompareVersions(version1, version2)
    {
      for (i = 0; i < version1.length; ++i)
      {
        var number1 = new Number(version1[i]);
        var number2 = new Number(version2[i]);

        if (number1 < number2)
          return -1;

        if (number1 > number2)
          return 1;
      }

      return 0;
    }

    -->
    </SCRIPT>
  </HEAD>

  <BODY>
    <div id="result" />
  </BODY>
</HTML>

如果搜尋「.NET CLR」版本成功，則會出現下列狀態訊息類型：

This machine has the correct version of the .NET Framework 3.0: 3.0.04425.00

This machine's userAgent string is: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727; .NET CLR 3.0.04425.00).

否則，會出現下列類型的狀態訊息：

This machine does not have correct version of the .NET Framework 3.0.

This machine's userAgent string is: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727).

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