Como: Detect Whether the .NET Framework 3.0 Is Installed
Before administrators can deploy Microsoft .NET Framework applications on a system, they must first confirm that the .NET Framework runtime is present. This topic provides a script written in HTML/JavaScript that administrators can use to determine whether .NET Framework is present on a system.
Observação
Para obter mais informações sobre como instalar, implantar e detectando a Microsoft .NET Framework, consulte a discussão na Deploying Microsoft.NET Framework versão 3.0.
Detect the ".NET CLR" User-Agent String
When .NET Framework 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 .NET Framework is installed, and displays a status message on the results of the search.
<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>
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 3.0: 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).
Otherwise, the following type of status message appears:
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).