Pash.Implementation.ExecutionContext.AddToErrorVariable C# (CSharp) Method

        internal void AddToErrorVariable(object error)
        {
            var errorRecordsVar = GetVariable("Error");
            var records = errorRecordsVar.Value as ArrayList;
            if (records == null)
            {
                // TODO: this should never happen as the variable is const. but anyway
                return;
            }
            // make sure it's not added multiple times (e.g. *same* exception thrown through multiple nested pipelines)
            if (!records.Contains(error))
            {
                records.Insert(0, error);
            }
        }

        public override Collection <PSObject> Invoke(IEnumerable input)
        {
            // TODO: run the pipeline on another thread and wait for the completion
            // TODO: nested pipelines: make sure we are running in the same thread as another pipeline, because
            // nested pipelines aren't allowed to run in their own thread. This ensures that there is a "parent" pipeline

            Input.Write(input, true);

            // in a pipeline, the first command enters *always* the ProcessRecord phase, the following commands only
            // if the previous command generated output. To make sure the first command enters that phase, add null
            // if nothing else is in the input stream
            if (_inputStream.Count == 0)
            {
                Input.Write(null);
            }

            string errorId = "BuildingPipelineProcessorFailed";

            ExecutionContext context = _runspace.ExecutionContext.Clone();

            RerouteExecutionContext(context);
            try
            {
                if (!_pipelineStateInfo.State.Equals(PipelineState.NotStarted))
                {
                    throw new InvalidPipelineStateException("Pipeline cannot be started",
                                                            _pipelineStateInfo.State, PipelineState.NotStarted);
                }

                var pipelineProcessor = BuildPipelineProcessor(context);

                _runspace.AddRunningPipeline(this);
                SetPipelineState(PipelineState.Running);

                errorId = "TerminatingError";
                pipelineProcessor.Execute(context);
                SetPipelineState(PipelineState.Completed);
            }
            catch (ExitException ex)
            {
                // Toplevel pipeline
                if (!IsNested)
                {
                    _runspace.PSHost.SetShouldExit(ex.ExitCode);
                }
                else
                {
                    // nested pipelines propagate the exit command
                    throw;
                }
            }
            catch (Exception ex)
            {
                // in case of throw statement, parse error, or "ThrowTerminatingError"
                // just add to error variable and rethrow that thing
                var errorRecord = (ex is IContainsErrorRecord) ?
                                  ((IContainsErrorRecord)ex).ErrorRecord : new ErrorRecord(ex, errorId, ErrorCategory.InvalidOperation, null);
                context.AddToErrorVariable(errorRecord);
                context.SetVariable("global:?", false); // last command was definitely not successfull
                throw;
            }
            _runspace.RemoveRunningPipeline(this);
            return(Output.NonBlockingRead());
        }