MatLab 2025a Error switching the .NET Framework Error using dotnetenv

Question

The framework is already loaded immediately after restarting Matlab 2025a.

Error using dotnetenv .NET is loaded. To change the environment, restart MATLAB then call dotnetenv.

Test code directly after restart.

asmList = System.AppDomain.CurrentDomain.GetAssemblies;
for k = 1:asmList.Length
    disp(string(asmList(k).FullName))
end

Results in:

mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 dotnetcli, Version=1.0.9264.2405, Culture=neutral, PublicKeyToken=null System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

I have already tested:

matlab -nojvm -singleCompThread -nodesktop

This however throws the same error.

How can I prevent this .NET framework from loading or control it myself?

Do you have something in your matlabrc or startup files which is loading .NET? Can you add a call to dotnotenv to display the loaded state at various points in these files to see when it gets loaded? — Wolfie
– Wolfie, Commented Sep 15 at 8:38
It is a fresh installation on Windows 11 and no startup file has been edited. — xnet_dev
– xnet_dev, Commented Sep 16 at 4:32
I have seen some software which interfaces with MATLAB edit the matlabrc file automatically, could that be the case? You might be able to add dotnetenv to the start of that file to see if .NET is loaded before any initialisation code even runs. If that's the case then this might be something to raise with MathWorks support — Wolfie
– Wolfie, Commented Sep 16 at 7:10

xnet_dev · Accepted Answer · 2025-09-16 17:08:16Z

I think I have found the solution.

Created a startup file and inserted the following.

dotnetenv("core")

asmList = System.AppDomain.CurrentDomain.GetAssemblies;
for k = 1:asmList.Length
    disp(string(asmList(k).FullName))
end

Result

ans = 

  NETEnvironment with properties:

            Runtime: core
             Status: notloaded
            Version: ""
    RuntimeLocation: ""

System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e
MathWorks.MATLAB.Interface, Version=25.1.0.0, Culture=neutral, PublicKeyToken=null
System.Runtime, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Runtime.InteropServices, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Runtime.InteropServices.RuntimeInformation, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Console, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Threading, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Runtime.Loader, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Text.RegularExpressions, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Collections, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Memory, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Linq, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.Win32.Registry, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Security.Principal.Windows, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Security.Permissions, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Collections.NonGeneric, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Concurrent, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.ObjectModel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Diagnostics.StackTrace, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.IO.FileSystem.DriveInfo, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.IO.IsolatedStorage, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.ComponentModel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Reflection.TypeExtensions, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Resources.Writer, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Runtime.CompilerServices.VisualC, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Runtime.Serialization.Formatters, Version=8.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Security.AccessControl, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.IO.FileSystem.AccessControl, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Threading.AccessControl, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Security.Claims, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Security.Cryptography, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Threading.Tasks.Parallel, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Threading.ThreadPool, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.CodeDom, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.ComponentModel.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
Microsoft.Win32.SystemEvents, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Diagnostics.Process, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Collections.Specialized, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.ComponentModel.TypeConverter, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.ComponentModel.EventBasedAsync, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Configuration.ConfigurationManager, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Xml.ReaderWriter, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Private.Xml, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Diagnostics.TraceSource, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Diagnostics.TextWriterTraceListener, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Diagnostics.PerformanceCounter, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Diagnostics.EventLog, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Diagnostics.FileVersionInfo, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Private.Uri, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.IO.Compression, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.IO.FileSystem.Watcher, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Windows.Extensions, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Net.Requests, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.HttpListener, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Net.NameResolution, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.WebClient, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
Microsoft.Win32.Primitives, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.WebHeaderCollection, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.WebProxy, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Net.Mail, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
System.Net.NetworkInformation, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.Ping, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.Security, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.Sockets, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.WebSockets.Client, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.WebSockets, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Net.Http, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
System.Xml.XmlSerializer, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Xml.XPath, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Diagnostics.Tracing, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
System.Security.Principal, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

>> dotnetenv("core")

ans = 

  NETEnvironment with properties:

            Runtime: core
             Status: loaded
            Version: ".NET 9.0.9"
    RuntimeLocation: "C:\Program Files\dotnet\shared\Microsoft.NETCore.App\9.0.9\"

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