/// <summary>
/// Execute BeginProcessing part of command. It sets up the overall scope
/// object for this command and runs the begin clause of the script block if
/// it isn't empty.
/// </summary>
/// <exception cref="PipelineStoppedException">
/// a terminating error occurred, or the pipeline was otherwise stopped
/// </exception>
internal override void DoBegin()
{
if (!RanBeginAlready)
{
RanBeginAlready = true;
ScriptBlock.LogScriptBlockStart(_scriptBlock, Context.CurrentRunspace.InstanceId);
// Even if there is no begin, we need to set up the execution scope for this script...
SetCurrentScopeToExecutionScope();
CommandProcessorBase oldCurrentCommandProcessor = Context.CurrentCommandProcessor;
try
{
Context.CurrentCommandProcessor = this;
if (_scriptBlock.HasBeginBlock)
{
RunClause(_runOptimizedCode ? _scriptBlock.BeginBlock : _scriptBlock.UnoptimizedBeginBlock,
AutomationNull.Value, _input);
}
}
finally
{
Context.CurrentCommandProcessor = oldCurrentCommandProcessor;
RestorePreviousScope();
}
}
}