How to Prevent and Handle StackOverflowExceptions in XSLT Transformations?

Preventing and handling StackOverflowException in XslTransform calls

Infinite recursion in user-supplied Xsl script may result in XslCompiledTransform.Transform when using the StackOverflowException method in an Xsl editor. To resolve this issue, consider the following:

Detection and Prevention:

According to Microsoft, starting with .NET Framework 2.0, StackOverflowException cannot be caught in a try-catch block and causes the process to terminate. Therefore, it is recommended to implement code to detect and prevent stack overflows.

One possible approach is to include a counter or status condition to terminate the recursive loop. However, this may not be practical if the recursion is controlled by an Xsl script.

Alternative process:

Another option is to load the XslTransform code into a separate process. This allows you to isolate the conversion process and recover from any exceptions without affecting your main application.

To do this:

1. Create a new process using the Process class for the conversion operation.
2. Set the StartInfo attribute to specify the assembly to be executed and run as a hidden process.
3. Call Start() to start the conversion.
4. Use WaitForExit() to wait for the conversion process to complete.
5. Check the ExitCode attribute to determine if StackOverflowException occurred. If this occurs, an error is displayed to the user.

Sample code:

Main process:

Process p1 = new Process();
p1.StartInfo.FileName = "ApplyTransform.exe";
p1.StartInfo.UseShellExecute = false;
p1.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;

p1.Start();
p1.WaitForExit();

if (p1.ExitCode == 1)
   Console.WriteLine("StackOverflow was thrown");

ApplyTransform process:

class Program
{
    static void Main(string[] args)
    {
        AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
        throw new StackOverflowException();
    }

    // 处理未处理的异常并以退出代码 1 退出
    static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e)
    {
        if (e.IsTerminating)
        {
            Environment.Exit(1);
        }
    }
}

By implementing these methods, you can effectively prevent or handle StackOverflowException caused by infinite recursion in XslTransform calls.

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