VB -> C#: OnErrorGoToStatementSyntax and OnErrorResumeNextStatementSyntax

• OnErrorGoToStatementSyntax, OnErrorResumeNextStatementSyntax
  • Many cases can probably be reasonably successfully converted as try...catch and then a goto within the catch and an appropriately placed label

Resume Next Example

    int lineNumber = 1;
    try
    {
        line1: lineNumber++;
        //First line of code would be here
        line2: lineNumber++;
        //Second line of code would be here    
    }
    catch
    {
        switch(lineNumber)
        {
            case 1: goto line1;
            case 2: goto line2;
        }
    }

Note: Even this messy solution isn’t valid because line1 is out of scope of the catch block and could be in a nested scope even within the try block

[valeriu33]

I found this issue as well, my project has a lot of "On Error GoTo"s and I’d be grateful if someone implemented this syntax

[GrahamTheCoder]

One idea for implementing exactly the resume next logic:

static void Main(string[] args)
    {
        Wrap(() =>
        {
            Console.WriteLine("First line");
        });

       int result = default;
        Wrap(() =>
        {
            result = Divide(10, 0); // Division by zero to simulate an error not directly in the method at hand that therefore shouldn't be supressed
        });

        Wrap(() =>
        {
            Console.WriteLine("Third line " + result);
        });
    }

    // Not sure if line number will help, but something like this to be able to match the stack trace's top frame
    static void Wrap(Action action, [CallerLineNumber] int lineNumber = 0)
    {
        try
        {
            action.Invoke();
        }
        catch (Exception ex)
        {
            if (IsDirectlyWithinLambda(ex, lineNumber))
            {
                // Handle or suppress the exception
                Console.WriteLine($"Exception suppressed at line {lineNumber}: {ex.Message}");
            }
            else
            {
                throw; // Rethrow if not directly within the lambda
            }
        }
    }
}