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This article explains how to get the list of assemblies that Visual Studio shows in the .NET tab of the Add Reference dialog (Project, Add Reference... menu). More informationThe .NET tab of the Add Reference dialog doesn't show assemblies in the Global Assembly Cache (GAC), but assemblies located in some specific folders. The GAC is a deployment mechanism (to locate shared assemblies from deployed applications), it is not a repository of assemblies to be used at development time. Instead, the Add Reference dialog shows assemblies located in the folder of the .NET Framework:
and in additional folders that are specified in the Windows registry:
Note 1: old Visual Studio versions used also the KEY_LOCAL_MACHINE\Software\Microsoft\VisualStudio\<version>\AssemblyFolders registry entry, but Visual Studio 2005 and higher don't use it any more. Note 2: if you are using regedit.exe and Windows 64-bit, go to the HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework registry key, which is the 32-bit view. But programmatically from an add-in use the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework registry entry because Visual Studio is a 32-bit application. Note 3: not all Visual Studio versions can target all .NET Framework versions. The available .NET Framework versions for eahc Visual Studio versions are the following:
The following sample shows the code of an add-in that shows in the Immediate window information the assemblies of those folders:
Imports System
Imports Microsoft.VisualStudio.CommandBars
Imports Extensibility
Imports EnvDTE
Imports EnvDTE80
Imports Microsoft.Win32
Public Class Connect
Implements IDTExtensibility2
Private _applicationObject As DTE2
Private _addInInstance As AddIn
Public Sub OnConnection(ByVal application As Object, ByVal connectMode As ext_ConnectMode, ByVal addInInst As Object, _
ByRef custom As Array) Implements IDTExtensibility2.OnConnection
_applicationObject = CType(application, DTE2)
_addInInstance = CType(addInInst, AddIn)
Select Case connectMode
Case ext_ConnectMode.ext_cm_AfterStartup
ShowAssemblies()
Case ext_ConnectMode.ext_cm_Startup
' OnStartupComplete will be called
End Select
End Sub
Public Sub OnDisconnection(ByVal disconnectMode As ext_DisconnectMode, ByRef custom As Array) _
Implements IDTExtensibility2.OnDisconnection
End Sub
Public Sub OnAddInsUpdate(ByRef custom As Array) Implements IDTExtensibility2.OnAddInsUpdate
End Sub
Public Sub OnStartupComplete(ByRef custom As Array) Implements IDTExtensibility2.OnStartupComplete
ShowAssemblies()
End Sub
Public Sub OnBeginShutdown(ByRef custom As Array) Implements IDTExtensibility2.OnBeginShutdown
End Sub
Private Sub ShowAssemblies()
Const NETFRAMEWORK_ASSEMBLY_FOLDERS As String = "SOFTWARE\Microsoft\.NETFramework\AssemblyFolders"
Const NETFRAMEWORK As String = "SOFTWARE\Microsoft\.NETFramework"
Dim assemblyFolder As String
' Get the .NET Framework runtime folder
assemblyFolder = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory()
ShowAssembliesFromFolder(assemblyFolder)
' Get the .NET Framework assembly folders
ShowAssembliesFromFolders(NETFRAMEWORK_ASSEMBLY_FOLDERS)
' Get the .NET Framework version-specific assembly folders
Select Case _applicationObject.RegistryRoot.ToUpper()
Case "SOFTWARE\MICROSOFT\VISUALSTUDIO\8.0"
ShowAssembliesFromFolders(NETFRAMEWORK & "\v2.0.50727\AssemblyFoldersEx")
Case "SOFTWARE\MICROSOFT\VISUALSTUDIO\9.0"
ShowAssembliesFromFolders(NETFRAMEWORK & "\v2.0.50727\AssemblyFoldersEx")
ShowAssembliesFromFolders(NETFRAMEWORK & "\v3.5\AssemblyFoldersEx")
Case "SOFTWARE\MICROSOFT\VISUALSTUDIO\10.0"
ShowAssembliesFromFolders(NETFRAMEWORK & "\v2.0.50727\AssemblyFoldersEx")
ShowAssembliesFromFolders(NETFRAMEWORK & "\v3.5\AssemblyFoldersEx")
ShowAssembliesFromFolders(NETFRAMEWORK & "\v4.0.30319\AssemblyFoldersEx")
Case "SOFTWARE\MICROSOFT\VISUALSTUDIO\11.0"
ShowAssembliesFromFolders(NETFRAMEWORK & "\v2.0.50727\AssemblyFoldersEx")
ShowAssembliesFromFolders(NETFRAMEWORK & "\v3.5\AssemblyFoldersEx")
ShowAssembliesFromFolders(NETFRAMEWORK & "\v4.0.30319\AssemblyFoldersEx")
ShowAssembliesFromFolders(NETFRAMEWORK & "\v4.5.50709\AssemblyFoldersEx")
End Select
End Sub
Private Sub ShowAssembliesFromFolders(ByVal registrySubKey As String)
Dim registryKey As RegistryKey = Nothing
Dim subkeys As String()
Dim subKey As String
Dim assemblyFolder As String
Try
registryKey = Registry.LocalMachine.OpenSubKey(registrySubKey, False)
subkeys = registryKey.GetSubKeyNames()
If Not (subkeys Is Nothing) Then
For Each subKey In subkeys
assemblyFolder = Registry.GetValue("HKEY_LOCAL_MACHINE\" & registrySubKey & "\" & subKey, "", "").ToString()
ShowAssembliesFromFolder(assemblyFolder)
Next
End If
Catch ex As Exception
Finally
If Not registryKey Is Nothing Then
registryKey.Close()
End If
End Try
End Sub
Private Sub ShowAssembliesFromFolder(ByVal assemblyFolder As String)
Dim assemblyFileFullName As String
If IO.Directory.Exists(assemblyFolder) Then
Debug.WriteLine("Assemblies of folder " & assemblyFolder)
For Each assemblyFileFullName In IO.Directory.GetFiles(assemblyFolder, "*.dll")
Debug.WriteLine(assemblyFileFullName)
Next
End If
End Sub
End Class
using System;
using Extensibility;
using EnvDTE;
using EnvDTE80;
using System.Diagnostics;
using Microsoft.Win32;
namespace MyAddIn
{
public class Connect : IDTExtensibility2
{
private DTE2 _applicationObject;
private AddIn _addInInstance;
public void OnConnection(object application, ext_ConnectMode connectMode, object addInInst, ref Array custom)
{
_applicationObject = (DTE2)application;
_addInInstance = (AddIn)addInInst;
switch (connectMode)
{
case ext_ConnectMode.ext_cm_AfterStartup:
ShowAssemblies();
break;
case ext_ConnectMode.ext_cm_Startup:
// OnStartupComplete will be called
break;
}
}
public void OnDisconnection(ext_DisconnectMode disconnectMode, ref Array custom)
{
}
public void OnAddInsUpdate(ref Array custom)
{
}
public void OnStartupComplete(ref Array custom)
{
ShowAssemblies();
}
public void OnBeginShutdown(ref Array custom)
{
}
private void ShowAssemblies()
{
const string NETFRAMEWORK_ASSEMBLY_FOLDERS = @"SOFTWARE\Microsoft\.NETFramework\AssemblyFolders";
const string NETFRAMEWORK = @"SOFTWARE\Microsoft\.NETFramework";
string assemblyFolder;
// Get the .NET Framework runtime folder
assemblyFolder = System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory();
ShowAssembliesFromFolder(assemblyFolder);
// Get the .NET Framework assembly folders
ShowAssembliesFromFolders(NETFRAMEWORK_ASSEMBLY_FOLDERS);
// Get the .NET Framework version-specific assembly folders
switch (_applicationObject.RegistryRoot.ToUpper())
{
case @"SOFTWARE\MICROSOFT\VISUALSTUDIO\8.0":
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v2.0.50727\AssemblyFoldersEx");
break;
case @"SOFTWARE\MICROSOFT\VISUALSTUDIO\9.0":
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v2.0.50727\AssemblyFoldersEx");
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v3.5\AssemblyFoldersEx");
break;
case @"SOFTWARE\MICROSOFT\VISUALSTUDIO\10.0":
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v2.0.50727\AssemblyFoldersEx");
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v3.5\AssemblyFoldersEx");
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v4.0.30319\AssemblyFoldersEx");
break;
case @"SOFTWARE\MICROSOFT\VISUALSTUDIO\11.0":
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v2.0.50727\AssemblyFoldersEx");
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v3.5\AssemblyFoldersEx");
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v4.0.30319\AssemblyFoldersEx");
ShowAssembliesFromFolders(NETFRAMEWORK + @"\v4.5.50709\AssemblyFoldersEx");
break;
}
}
private void ShowAssembliesFromFolders(string registrySubKey)
{
RegistryKey registryKey = null;
string[] subkeys;
string assemblyFolder;
try
{
registryKey = Registry.LocalMachine.OpenSubKey(registrySubKey, false);
subkeys = registryKey.GetSubKeyNames();
if (subkeys != null)
{
foreach (string subKey in subkeys)
{
assemblyFolder = Registry.GetValue("HKEY_LOCAL_MACHINE\\" + registrySubKey + "\\" + subKey, "", "").ToString();
ShowAssembliesFromFolder(assemblyFolder);
}
}
}
catch
{
}
finally
{
if (registryKey != null)
{
registryKey.Close();
}
}
}
private void ShowAssembliesFromFolder(string assemblyFolder)
{
if (System.IO.Directory.Exists(assemblyFolder))
{
Debug.WriteLine("Assemblies of folder " + assemblyFolder);
foreach ( string assemblyFileFullName in System.IO.Directory.GetFiles(assemblyFolder, "*.dll"))
{
Debug.WriteLine(assemblyFileFullName);
}
}
}
}
}
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