How Can I Determine the Exact .NET Framework Version Installed on My Windows System?

Precisely Identifying Your Installed .NET Framework Version

The .NET Framework is a crucial component for many Windows applications. Knowing its exact version is vital for compatibility and troubleshooting. While Environment.Version() offers limited details (only the major version), accessing the Windows Registry provides a complete solution.

Accessing Registry Data for .NET 1-4 Versions

For .NET Framework versions 1 through 4, the registry holds comprehensive version and service pack information:

<code class="language-csharp">RegistryKey installed_versions = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\NET Framework Setup\NDP");
string[] version_names = installed_versions.GetSubKeyNames();
double Framework = Convert.ToDouble(version_names[version_names.Length - 1].Remove(0, 1), CultureInfo.InvariantCulture);
int SP = Convert.ToInt32(installed_versions.OpenSubKey(version_names[version_names.Length - 1]).GetValue("SP", 0));</code>

Determining .NET 4.5 and Later Versions

Microsoft's official documentation provides a robust method for identifying .NET Framework 4.5 and subsequent versions:

<code class="language-csharp">using Microsoft.Win32;

private static void Get45or451FromRegistry()
{
    using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey("SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\")) {
        int releaseKey = Convert.ToInt32(ndpKey.GetValue("Release"));
        if (true) {
            Console.WriteLine("Version: " + CheckFor45DotVersion(releaseKey));
        }
    }
}

private static string CheckFor45DotVersion(int releaseKey)
{
    // Forward compatibility check
    if (releaseKey >= 528040) {
        return "4.8 or later";
    }
    // Version-specific checks (omitted for brevity)
    // ...

    return "No 4.5 or later version detected";
}</code>

These code snippets allow for accurate retrieval of the .NET Framework version and service pack level, ensuring smooth application operation and integration.

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