/// <summary>
/// Invokes the underlying function of the command.
/// </summary>
/// <param name="toggle">The toggle status of the command.</param>
/// <param name="context">The context under which the command is invoked.</param>
/// <param name="args">The results of evaluating each argument given to the command.</param>
/// <returns>A status code accompanied by text output.</returns>
/// <exception cref="System.ArgumentNullException">Thrown when the given argument array is null.</exception>
public EvaluationResult Invoke(Toggler toggle, EvaluationContext context, params Expression[] args)
{
if (args == null)
{
throw new ArgumentNullException("args");
}
var e1 = new CommandInvocationEventArgs(context, toggle, args);
OnInvocation(e1);
if (e1.Cancel)
{
return(new EvaluationResult(CommonStatusCodes.InvocationCanceled, null, e1.CancelReason ?? "Invocation has stopped."));
}
#if HCIE
var e2 = new HostCommandInvocationEventArgs(this, context, toggle, args);
context.Host.OnInvocation(e2);
if (e2.Stop)
{
return(new EvaluationResult(CommonStatusCodes.InvocationCanceled, null, e2.StopReason ?? "Invocation has stopped."));
}
#endif
try
{
return(this.InvokeInternal(toggle, context, args));
}
catch (Exception x)
{
return(new EvaluationResult(CommonStatusCodes.ClrException, null, x.ToString(), x));
}
}
/// <summary>
/// Raisese the <see cref="vCommands.CommandHost.CommandInvocation"/> event.
/// </summary>
/// <param name="e">A <see cref="vCommands.EventArguments.HostCommandInvocationEventArgs"/> that contains event data.</param>
internal void OnInvocation(HostCommandInvocationEventArgs e)
{
CommandInvocation?.Invoke(this, e);
}