more tweaks to prebuild packages

src/Microsoft.DotNet.Interactive.CSharpProject/Build/Package.cs

@@ -115,6 +115,7 @@ private bool TryLoadWorkspaceFromCache()
         if (Directory.Exists)
         {
             var cacheFile = FindCacheFile(Directory);
+
             if (cacheFile is not null)
             {
                 LoadRoslynWorkspaceFromCache(cacheFile).Wait();
@@ -367,6 +368,11 @@ public async Task BuildAsync()
 
         var cacheFile = FindCacheFile(Directory);
 
+        if (cacheFile is not {Exists: true})
+        {
+            throw new FileNotFoundException($"Cache file *.{BuildCacheFileUtilities.CacheFilenameSuffix} not found in {Directory}.");
+        }
+
         await cacheFile.WaitForFileAvailableAsync();
         await LoadRoslynWorkspaceFromCache(cacheFile);
 
@@ -453,5 +459,5 @@ public static async Task<Package> GetOrCreateConsolePackageAsync(bool enableBuil
         return package;
     }
 
-    internal static FileInfo FindCacheFile(DirectoryInfo directoryInfo) => directoryInfo.GetFiles("*" + BuildCacheFileUtilities.cacheFilenameSuffix).FirstOrDefault();
+    internal static FileInfo FindCacheFile(DirectoryInfo directoryInfo) => directoryInfo.GetFiles("*" + BuildCacheFileUtilities.CacheFilenameSuffix).FirstOrDefault();
 }

src/Microsoft.DotNet.Interactive.CSharpProject/Build/PackageInitializer.cs

@@ -45,11 +45,11 @@ public virtual async Task InitializeAsync(DirectoryInfo directory)
     {
         var dotnet = new Dotnet(directory);
 
-        await dotnet.New("globaljson");
+        await dotnet.New("globaljson", "--force");
 
         var result = await dotnet
             .New(Template,
-                args: $"--name \"{ProjectName}\" --language \"{Language}\" --output \"{directory.FullName}\"");
+                args: $"--name \"{ProjectName}\" --language \"{Language}\" --output \"{directory.FullName}\" --force");
         result.ThrowOnFailure($"Error initializing in {directory.FullName}");
 
         if (afterCreate is not null)

src/Microsoft.DotNet.Interactive.CSharpProject/Build/RoslynWorkspaceUtilities/BuildCacheFileUtilities.cs

@@ -11,7 +11,7 @@ namespace Microsoft.DotNet.Interactive.CSharpProject.RoslynWorkspaceUtilities;
 
 internal static class BuildCacheFileUtilities
 {
-    internal static string cacheFilenameSuffix = ".interactive.workspaceData.cache";
+    internal static string CacheFilenameSuffix = ".interactive.workspaceData.cache";
     internal static string DirectoryBuildTargetFilename = "Directory.Build.Targets";
 
     internal static string DirectoryBuildTargetsContent =
@@ -128,6 +128,7 @@ internal static async Task BuildAndCreateCacheFileAsync(string csprojFilePath)
         File.Delete(tempDirectoryBuildTarget);
 
         var cacheFile = Package.FindCacheFile(directoryInfo);
+
         if (cacheFile is not { Exists: true })
         {
             throw new FileNotFoundException($"Cache file not found after build completion in directory: {directoryInfo.FullName}");

src/Microsoft.DotNet.Interactive.CSharpProject/Build/RoslynWorkspaceUtilities/RoslynWorkspaceUtilities.cs

@@ -50,7 +50,7 @@ internal static BuildDataResults ResultsFromCacheFileUsingProjectFilePath(string
             throw new ArgumentException($"project file does not exist : {csprojFilePath}");
         }
 
-        var cacheFilePath = csprojFilePath + cacheFilenameSuffix;
+        var cacheFilePath = csprojFilePath + CacheFilenameSuffix;
 
         return GetResultsFromCacheFile(cacheFilePath);
     }

src/Microsoft.DotNet.Interactive/Utility/CommandLineResult.cs

@@ -27,7 +27,7 @@ public CommandLineResult(
 
     public void ThrowOnFailure(string message = null)
     {
-        if (ExitCode != 0)
+        if (ExitCode is not 0)
         {
             throw new CommandLineInvocationException(
                 this,