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Como: Detect Whether the .NET Framework 3.5 Is Installed

  • Artigo

Antes dos administradores podem implantar Windows Presentation Foundation (WPF) aplicativos em um sistema que se destina a .NET Framework 3.5, deve primeiro confirmar que o .NET Framework 3.5 em tempo de execução está presente. Este tópico fornece um script escrito em HTML/JavaScript que os administradores podem usar para determinar se o .NET Framework 3.5 está presente no sistema.

Observação

For more detailed information on installing, deploying, and detecting the .NET Framework, see Instalação do .NET Framework.

Exemplo

When the .NET Framework 3.5 is installed, the MSI adds ".NET CLR" and the version number to the UserAgent string. The following example shows a script embedded in a simple HTML page. The script searches the UserAgent string to determine whether the .NET Framework 3.5 is installed, and displays a status message on the results of the search.

Observação

Este script foi desenvolvido para o Internet Explorer.Não inclua outros navegadores.Informações de NET CLR na seqüência UserAgent.

<HTML>
  <HEAD>
    <TITLE>Test for the .NET Framework 3.5</TITLE>
    <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8" />
    <SCRIPT LANGUAGE="JavaScript">
    <!--
    var dotNETRuntimeVersion = "3.5.0.0";
    
    function window::onload()
    {
      if (HasRuntimeVersion(dotNETRuntimeVersion))
      {
        result.innerText = 
          "This machine has the correct version of the .NET Framework 3.5."
      } 
      else
      {
        result.innerText = 
          "This machine does not have the correct version of the .NET Framework 3.5." +
          " The required version is v" + dotNETRuntimeVersion + ".";
      }
      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>

If the search for the ".NET CLR " version is successful, the following type of status message appears:

This machine has the correct version of the .NET Framework 3.5.

This machine's userAgent string is: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; InfoPath.2; .NET CLR 3.0.590; .NET CLR 3.5.20726; MS-RTC LM 8).

Otherwise, the following type of status message appears:

This machine does not have the correct version of the .NET Framework 3.5. The required version is v3.5.0.0.

This machine's userAgent string is: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; .NET CLR 1.1.4322; InfoPath.2; .NET CLR 3.0.590; MS-RTC LM 8).

Consulte também

Conceitos

Como: Detect Whether the .NET Framework 3.0 Is Installed

Histórico de alterações

Date

History

Motivo

Novembro de 2010

Adicionada uma nota sobre o script e o Internet Explorer.

Comentários do cliente.