has_dotnet with Matlab < R2022b

Author: scivision

+stdlib/dotnet_home.m

@@ -1,7 +1,9 @@
 %% DOTNET_HOME give .NET RuntimeLocation
 
 function h = dotnet_home()
-
-h = dotnetenv().RuntimeLocation;
-
-end
+try
+  h = dotnetenv().RuntimeLocation;
+catch
+  h = "";
+end
+end

+stdlib/has_dotnet.m

@@ -8,7 +8,11 @@
 try
   y = NET.isNETSupported;
 catch
-  y = false;
+  try
+    y = stdlib.dotnet_api() >= 4;
+  catch
+    y = false;
+  end
 end
 
 end

test/TestLang.m

@@ -27,7 +27,11 @@ function test_python_home(tc)
 
 function test_dotnet_home(tc)
 tc.assumeTrue(stdlib.has_dotnet(), ".NET not available")
-tc.verifyNotEmpty(stdlib.dotnet_home())
+h = stdlib.dotnet_home();
+
+if ~stdlib.matlabOlderThan('R2022b')
+  tc.verifyGreaterThan(strlength(h), 0)
+end
 end
 
 function test_dotnet_version(tc)