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Users can install & run multiple versions of .NET Framework on their computers. When you develop or deploy your app, you might need to know which .NET Framework versions are installed on the user"s computer. The registry contains a danh mục of the versions of .NET Framework installed on the computer.

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Note

This article is specific lớn .NET Framework. To determine which .NET Core and .NET 5+ SDKs and runtimes are installed, see How to check that .NET is already installed.


.NET Framework consists of two main components, which are versioned separately:

A mix of assemblies, which are collections of types & resources that provide the functionality for your apps. .NET Framework và the assemblies nội dung the same version number. For example, .NET Framework versions include 4.5, 4.6.1, và 4.7.2.

Community-maintained tools are available to help detect which .NET Framework versions are installed:

For information about detecting the installed updates for each version of .NET Framework, see How to: Determine which .NET Framework updates are installed.

Determine which .NET implementation và version an ứng dụng is running on

You can use the RuntimeInformation.FrameworkDescription property to lớn query for which .NET implementation and version your phầm mềm is running on. If the ứng dụng is running on .NET Framework, the output will be similar to:

.NET Framework 4.8.4250.0By comparison, if the ứng dụng is running on .NET bộ vi xử lý core or .NET 5+, the output đầu ra will be similar to:

.NET vi xử lý core 3.1.9.NET 5.0.0

Detect .NET Framework 4.5 and later versions

The version of .NET Framework (4.5 và later) installed on a machine is listed in the registry at HKEY_LOCAL_MACHINESOFTWAREjdomain.vnNET Framework SetupNDPv4Full. If the Full subkey is missing, then .NET Framework 4.5 or above isn"t installed.


The Release REG_DWORD value in the registry represents the version of .NET Framework installed.

.NET Framework versionValue of Release
.NET Framework 4.5All Windows operating systems: 378389
.NET Framework 4.5.1On Windows 8.1 & Windows vps 2012 R2: 378675On all other Windows operating systems: 378758
.NET Framework 4.5.2All Windows operating systems: 379893
.NET Framework 4.6On Windows 10: 393295On all other Windows operating systems: 393297
.NET Framework 4.6.1On Windows 10 November Update systems: 394254On all other Windows operating systems (including Windows 10): 394271
.NET Framework 4.6.2On Windows 10 Anniversary Update và Windows vps 2016: 394802On all other Windows operating systems (including other Windows 10 operating systems): 394806
.NET Framework 4.7On Windows 10 Creators Update: 460798On all other Windows operating systems (including other Windows 10 operating systems): 460805
.NET Framework 4.7.1On Windows 10 Fall Creators Update and Windows Server, version 1709: 461308On all other Windows operating systems (including other Windows 10 operating systems): 461310
.NET Framework 4.7.2On Windows 10 April 2018 Update và Windows Server, version 1803: 461808On all Windows operating systems other than Windows 10 April 2018 Update and Windows Server, version 1803: 461814
.NET Framework 4.8On Windows 10 May 2019 Update và Windows 10 November 2019 Update: 528040On Windows 10 May 2020 Update và Windows 10 October 2020 Update và Windows 10 May 2021 Update: 528372On Windows 11 và Windows hệ thống 2022: 528449On all other Windows operating systems (including other Windows 10 operating systems): 528049
.NET Framework 4.8.1On Windows 11 2022 Update: 533320All other Windows operating systems: 533325

Minimum version

To determine whether a minimum version of .NET Framework is present, check for a Release REG_DWORD value that"s greater than or equal to the corresponding value listed in the following table. For example, if your application runs under .NET Framework 4.8 or a later version, kiểm tra for a Release REG_DWORD value that"s greater than or equal to 528040.

.NET Framework versionMinimum value
.NET Framework 4.5378389
.NET Framework 4.5.1378675
.NET Framework 4.5.2379893
.NET Framework 4.6393295
.NET Framework 4.6.1394254
.NET Framework 4.6.2394802
.NET Framework 4.7460798
.NET Framework 4.7.1461308
.NET Framework 4.7.2461808
.NET Framework 4.8528040
.NET Framework 4.8.1533320

Use Registry Editor

From the Start menu, choose Run, enter regedit, & then select OK.

(You must have administrative credentials to lớn run regedit.)

In the Registry Editor, xuất hiện the following subkey: HKEY_LOCAL_MACHINESOFTWAREjdomain.vnNET Framework SetupNDPv4Full. If the Full subkey isn"t present, then you don"t have .NET Framework 4.5 or later installed.

Check for a REG_DWORD entry named Release. If it exists, then you have .NET Framework 4.5 or later installed. Its value corresponds to a particular version of .NET Framework. In the following figure, for example, the value of the Release entry is 528040, which is the release key for .NET Framework 4.8.

*

Use PowerShell to kiểm tra for a minimum version

Use PowerShell commands to kiểm tra the value of the Release entry of the HKEY_LOCAL_MACHINESOFTWAREjdomain.vnNET Framework SetupNDPv4Full subkey.

The following examples kiểm tra the value of the Release entry khổng lồ determine whether .NET Framework 4.6.2 or later is installed. This code returns True if it"s installed & False otherwise.

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(Get-ItemProperty "HKLM:SOFTWAREjdomain.vnNET Framework SetupNDPv4Full").Release -ge 394802

Query the registry using code

The following example checks the value of the Release entry in the registry lớn find the versions of .NET Framework 4.5-4.8 that are installed.


Tip

Add the directive using jdomain.vn.Win32 or Imports jdomain.vn.Win32 at the đứng đầu of your code tệp tin if you haven"t already done so.


"SOFTWAREjdomain.vnNET Framework SetupNDPv4Full";using (var ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey)) if (ndpKey != null && ndpKey.GetValue("Release") != null) Console.WriteLine($".NET Framework Version: CheckFor45PlusVersion((int)ndpKey.GetValue("Release"))"); else Console.WriteLine(".NET Framework Version 4.5 or later is not detected."); // Checking the version using >= enables forward compatibility.string CheckFor45PlusVersion(int releaseKey) if (releaseKey >= 528040) return "4.8 or later"; if (releaseKey >= 461808) return "4.7.2"; if (releaseKey >= 461308) return "4.7.1"; if (releaseKey >= 460798) return "4.7"; if (releaseKey >= 394802) return "4.6.2"; if (releaseKey >= 394254) return "4.6.1"; if (releaseKey >= 393295) return "4.6"; if (releaseKey >= 379893) return "4.5.2"; if (releaseKey >= 378675) return "4.5.1"; if (releaseKey >= 378389) return "4.5"; // This code should never execute. A non-null release key should mean // that 4.5 or later is installed. Return "No 4.5 or later version detected";Private Sub Get45PlusFromRegistry() Const subkey As String = "SOFTWAREjdomain.vnNET Framework SetupNDPv4Full" Using ndpKey As RegistryKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32).OpenSubKey(subkey) If ndpKey IsNot Nothing AndAlso ndpKey.GetValue("Release") IsNot Nothing Then Console.WriteLine($".NET Framework Version: CheckFor45PlusVersion(ndpKey.GetValue("Release"))") Else Console.WriteLine(".NET Framework Version 4.5 or later is not detected.") kết thúc If over UsingEnd Sub' Checking the version using >= enables forward compatibility.Private Function CheckFor45PlusVersion(releaseKey As Integer) As String If releaseKey >= 528040 Then Return "4.8 or later" ElseIf releaseKey >= 461808 Then Return "4.7.2" ElseIf releaseKey >= 461308 Then Return "4.7.1" ElseIf releaseKey >= 460798 Then Return "4.7" ElseIf releaseKey >= 394802 Then Return "4.6.2" ElseIf releaseKey >= 394254 Then Return "4.6.1" ElseIf releaseKey >= 393295 Then Return "4.6" ElseIf releaseKey >= 379893 Then Return "4.5.2" ElseIf releaseKey >= 378675 Then Return "4.5.1" ElseIf releaseKey >= 378389 Then Return "4.5" end If ' This code should never execute. A non-null release key should mean ' that 4.5 or later is installed. Return "No 4.5 or later version detected"End FunctionThe example displays output like the following:

.NET Framework Version: 4.6.1This example follows the recommended practice for version checking:

It checks whether the value of the Release entry is greater than or equal to the value of the known release keys.It checks in order from most recent version to earliest version.

Detect .NET Framework 1.0 through 4.0

Each version of .NET Framework from 1.1 to lớn 4.0 is listed as a subkey at HKEY_LOCAL_MACHINESOFTWAREjdomain.vnNET Framework SetupNDP. The following table lists the path khổng lồ each .NET Framework version. For most versions, there"s an Install REG_DWORD value of 1 to indicate this version is installed. In these subkeys, there"s also a Version REG_SZ value that contains a version string.


Framework VersionRegistry SubkeyValue
1.0HKLMSoftwarejdomain.vn.NETFrameworkPolicyv1.03705Install REG_SZ equals 1
1.1HKLMSoftwarejdomain.vnNET Framework SetupNDPv1.1.4322Install REG_DWORD equals 1
2.0HKLMSoftwarejdomain.vnNET Framework SetupNDPv2.0.50727Install REG_DWORD equals 1
3.0HKLMSoftwarejdomain.vnNET Framework SetupNDPv3.0SetupInstallSuccess REG_DWORD equals 1
3.5HKLMSoftwarejdomain.vnNET Framework SetupNDPv3.5Install REG_DWORD equals 1
4.0 Client ProfileHKLMSoftwarejdomain.vnNET Framework SetupNDPv4ClientInstall REG_DWORD equals 1
4.0 Full ProfileHKLMSoftwarejdomain.vnNET Framework SetupNDPv4FullInstall REG_DWORD equals 1

Important

If the phầm mềm you"re running is 32-bit và running in 64-bit Windows, the registry paths will be different than previously listed. The 64-bit registry is available in the HKEY_LOCAL_MACHINESOFTWAREWow6432Node subkey. For example, the registry subkey for .NET Framework 3.5 is HKEY_LOCAL_MACHINESOFTWAREWow6432Nodejdomain.vnNET Framework SetupNDPv3.5.


Notice that the registry path to the .NET Framework 1.0 subkey is different from the others.

Use Registry Editor (older framework versions)

From the Start menu, choose Run, enter regedit, và then select OK.

You must have administrative credentials khổng lồ run regedit.

Query the registry using code (older framework versions)

Use the jdomain.vn.Win32.RegistryKey class lớn access the HKEY_LOCAL_MACHINESOFTWAREjdomain.vnNET Framework SetupNDP subkey in the Windows registry.


Important

If the app you"re running is 32-bit & running in 64-bit Windows, the registry paths will be different than previously listed. The 64-bit registry is available in the HKEY_LOCAL_MACHINESOFTWAREWow6432Node subkey. For example, the registry subkey for .NET Framework 3.5 is HKEY_LOCAL_MACHINESOFTWAREWow6432Nodejdomain.vnNET Framework SetupNDPv3.5.


The following example finds the versions of .NET Framework 1-4 that are installed:

// xuất hiện the registry key for the .NET Framework entry.using (RegistryKey ndpKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32). OpenSubKey(
"SOFTWAREjdomain.vnNET Framework SetupNDP")) foreach (var versionKeyName in ndpKey.GetSubKeyNames()) // Skip .NET Framework 4.5 version information. If (versionKeyName == "v4") continue; if (versionKeyName.StartsWith("v")) RegistryKey versionKey = ndpKey.OpenSubKey(versionKeyName); // Get the .NET Framework version value. Var name = (string)versionKey.GetValue("Version", ""); // Get the service pack (SP) number. Var sp = versionKey.GetValue("SP", "").ToString(); // Get the installation flag. Var install = versionKey.GetValue("Install", "").ToString(); if (string.IsNullOrEmpty(install)) // No install info; it must be in a child subkey. Console.WriteLine($"versionKeyName name"); else if (install == "1") // Install = 1 means the version is installed. If (!string.IsNullOrEmpty(sp)) Console.WriteLine($"versionKeyName name SPsp"); else Console.WriteLine($"versionKeyName name"); if (!string.IsNullOrEmpty(name)) continue; // else print out info from subkeys... // Iterate through the subkeys of the version subkey. Foreach (var subKeyName in versionKey.GetSubKeyNames()) RegistryKey subKey = versionKey.OpenSubKey(subKeyName); name = (string)subKey.GetValue("Version", ""); if (!string.IsNullOrEmpty(name)) sp = subKey.GetValue("SP", "").ToString(); install = subKey.GetValue("Install", "").ToString(); if (string.IsNullOrEmpty(install)) // No install info; it must be later. Console.WriteLine($"versionKeyName name"); else if (install == "1") if (!string.IsNullOrEmpty(sp)) Console.WriteLine($"subKeyName name SPsp"); else Console.WriteLine($" subKeyName name"); ' Opens the registry key for the .NET Framework entry.Using ndpKey As RegistryKey = RegistryKey.OpenBaseKey(RegistryHive.LocalMachine, RegistryView.Registry32). OpenSubKey("SOFTWAREjdomain.vnNET Framework SetupNDP") For Each versionKeyName In ndpKey.GetSubKeyNames() ' Skip .NET Framework 4.5 và later. If versionKeyName = "v4" Then Continue For If versionKeyName.StartsWith("v") Then Dim versionKey As RegistryKey = ndpKey.OpenSubKey(versionKeyName) ' Get the .NET Framework version value. Dim name = DirectCast(versionKey.GetValue("Version", ""), String) ' Get the service pack (SP) number. Dim sp = versionKey.GetValue("SP", "").ToString() Dim install = versionKey.GetValue("Install", "").ToString() If String.IsNullOrEmpty(install) Then ' No install info; it must be in a child subkey. Console.WriteLine($"versionKeyName name") ElseIf install = "1" Then If Not String.IsNullOrEmpty(sp) Then Console.WriteLine($"versionKeyName name SPsp") Else Console.WriteLine($"versionKeyName name") end If over If If Not String.IsNullOrEmpty(name) Then Continue For end If For Each subKeyName In versionKey.GetSubKeyNames() Dim subKey As RegistryKey = versionKey.OpenSubKey(subKeyName) name = DirectCast(subKey.GetValue("Version", ""), String) If Not String.IsNullOrEmpty(name) Then sp = subKey.GetValue("SP", "").ToString() over If install = subKey.GetValue("Install", "").ToString() If String.IsNullOrEmpty(install) Then ' No install info; it must be later. Console.WriteLine($"versionKeyName name") ElseIf install = "1" Then If Not String.IsNullOrEmpty(sp) Then Console.WriteLine($"subKeyName name SPsp") Else Console.WriteLine($" subKeyName name") over If over If Next kết thúc If NextEnd UsingThe example displays đầu ra similar to the following:

Find CLR versions

The .NET Framework CLR installed with .NET Framework is versioned separately. There are two ways khổng lồ detect the version of the .NET Framework CLR:

The Environment class


Important

For .NET Framework 4.5 và later versions, don"t use the Environment.Version property khổng lồ detect the version of the CLR. Instead, query the registry as described in Detect .NET Framework 4.5 & later versions.


After you have the Version object, query it as follows:

The following example uses the Environment.Version property lớn retrieve CLR version information:

Console.WriteLine($"Version: Environment.Version");Console.WriteLine($"Version: Environment.Version")The example displays đầu ra similar to lớn the following:


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