Script.Evaluator.Eval() exception

[kgwood39]

Running under the .net framework, this simple example:
int sum = CSScript.RoslynEvaluator.Eval("6 + 3");

is creating the following error:
CSScriptLib.CompilerException
HResult=0x80131600
Message=<script>(1,1): error CS0518: Predefined type 'System.Object' is not defined or imported
error CS0518: Predefined type 'System.Object' is not defined or imported
error CS0518: Predefined type 'System.Threading.Tasks.Task`1' is not defined or imported
error CS0400: The type or namespace name 'System.Object, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' could not be found in the global namespace (are you missing an assembly reference?)

<script>(0,1): error CS0518: Predefined type 'System.Object' is not defined or imported error CS0518: Predefined type 'System.Object' is not defined or imported <script>(1,1): error CS0518: Predefined type 'System.Int32' is not defined or imported <script>(1,5): error CS0518: Predefined type 'System.Int32' is not defined or imported error CS0518: Predefined type 'System.Attribute' is not defined or imported error CS0518: Predefined type 'System.Attribute' is not defined or imported error CS0518: Predefined type 'System.Int32' is not defined or imported error CS0656: Missing compiler required member 'System.AttributeUsageAttribute..ctor' error CS0656: Missing compiler required member 'System.AttributeUsageAttribute.AllowMultiple' error CS0656: Missing compiler required member 'System.AttributeUsageAttribute.Inherited' Source=CSScriptLib StackTrace: at CSScriptLib.RoslynEvaluator.Compile(String scriptText, String scriptFile, CompileInfo info) in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\CSScriptLib\Evaluator.Roslyn.cs:line 633 at CSScriptLib.EvaluatorBase`1.CompileCode(String scriptText, String scriptFile, CompileInfo info) in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\CSScriptLib\EvaluatorBase.cs:line 241 at CSScriptLib.EvaluatorBase`1.CompileCode(String scriptText, CompileInfo info) in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\CSScriptLib\EvaluatorBase.cs:line 175 at CSScriptLib.RoslynEvaluator.Eval(String scriptText) in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\CSScriptLib\Evaluator.Roslyn.cs:line 754 at ConsoleApp1.Program.Test_Roslyn() in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\Client.NET-Framework (Roslyn+CodeDom)\Program.cs:line 80 at ConsoleApp1.Program.main(String[] args) in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\Client.NET-Framework (Roslyn+CodeDom)\Program.cs:line 27 at ConsoleApp1.Program.Main(String[] args) in C:\Users\kewoo\source\repos\CSScript\cs-script-master\cs-script-master\src\CSScriptLib\src\Client.NET-Framework (Roslyn+CodeDom)\Program.cs:line 21

[oleg-shilo]

Yes, it is a defect.

I just committed the fix. It will be available with the very next release, planned to be just after .NET 10 release.

Thank you for reporting this. It was a silly coding mistake 🤦

[oleg-shilo]

BTW, the sample you are running, and the CodeDom evaluator have been updated. CodeDom engine was notoriously slow. Now I found an undocumented feature of the MS C# compiler (that VS uses under the hood) that allows keeping a hot copy of the compiler in the OS memory. This squashed CodeDom evaluator compilation time by more than x10 for any consecutive app execution. It practically as fast as Roslyn.

This feature will also be available in the next release (within a week).