Is it possible to support using an anonymous method to declare and initialize a delegate?

[cesaryuan]

Is it possible to support using an anonymous method or a lambda expression to declare and initialize a delegate? I test the follow example, but it throw error.

var context = new EvalContext();
context.RegisterType(typeof(Regex));
context.RegisterType(typeof(Match));
var result = context.Execute(@"
    Regex.Replace(""test"", @""\b[a-z]\w+"", (Match match) =>
    {
        return """";
    });
");

The detail errors like this,

Z.Expressions.Compiler.Shared.EvalException
  HResult=0x80131500
  Message=Oops! No applicable member has been found for the expression. The error occurred for expression "." at position 23 near ".Replace(\"test\", @\"\b[a-z".
  Source=Z.Expressions.Eval
  StackTrace:
   at .(ExpressionScope , Expression , Type , String , List`1 , Boolean , List`1 , SyntaxNode , Expression& )
   at .(ExpressionScope , SyntaxNode , Type , Expression , List`1 )
   at .(ExpressionScope , SyntaxNode , Expression , Boolean )
   at .(ExpressionScope , SyntaxNode , Expression , Boolean )
   at .(ExpressionScope , SyntaxNode , Expression , Boolean )
   at Z.Expressions.CodeCompiler.CSharp.ExpressionParser.ParseSyntax(ExpressionScope scope, SyntaxNode node, Type resultType)
   at .[](EvalContext , String , IDictionary`2 , Type , EvalCompilerParameterKind , ExpressionScope , String , Boolean , Boolean )
   at .[](EvalContext , String , IDictionary`2 , Type , EvalCompilerParameterKind , Boolean , Boolean , Boolean )
   at Z.Expressions.EvalContext.Execute[TResult](String code)
   at SomeTest.Program.Main(String[] args) in E:\Desktop\Program\C#\SomeTest\Program.cs:line 41

  此异常最初是在此调用堆栈中引发的: 
    [外部代码]
    SomeTest.Program.Main(string[]) (位于 Program.cs 中)

[JonathanMagnan]

Hello @cesaryuan ,

Thank you for reporting, we will look at this to see if that's something we could support or not.

Best Regards,

Jon

[JonathanMagnan]

Hello @se ,

The v4.0.29 has been released.

Could you try it and let us know if we successfully added the code to handle delegate correctly?

Best Regards,

Jon

[cesaryuan]

Works for me! But it seems that still not support using delegate keyword to initialize an delegate (you said in the readme that you support all keyword). Anyway, lambda expression is enough. Thank you! @JonathanMagnan

[JonathanMagnan]

Thank,

We will look at it if we can do it.

[JonathanMagnan]

Hello @cesaryuan ,

It took us a while but the v4.0.30 has been finally released.

We now support several case with delegate such as:

var delegateAction = Eval.Execute<Action>(@"Action greet = delegate { Console.WriteLine(""Hello!""); };");
delegateAction();

var delegateFunc = Eval.Execute<Func<int, int, int>>(@"Func<int, int, int> sum = delegate (int a, int b) { return a + b; }; return sum;");
var x1 = delegateFunc(1, 2);

If you still have some issue with your delegate, please provide us a full example about what you will want to do and we will look at it.

Best Regards,

Jon

[cesaryuan]

@JonathanMagnan Thanks for your effort! This is genuinely nice, and there is no issue for me.