停止ProcessRecord中cmdlet的执行

如何停止ProcessRecord方法中接受管道输入的cmdlet的执行?如果ProcessRecord中的条件不满足，我需要立即停止执行并返回false:

protected override void BeginProcessing()
{
    _output = true;
}
protected override void ProcessRecord()
{
    //processing
    if(condtion == true) return;
    _output = false;
    //How do I stop processing now, and ensure _output is returned as result?
}
protected override void EndProcessing()
{
    WriteObject(_output);
}

PipelineStoppedException似乎工作，但没有给我确切的行为。

更新了一个更具体的例子，使用PipelineStoppedException:

让我们考虑一个cmdlet First-List，它的行为应该类似于LINQ中的First()。这个cmdlet的实现如下:

[Cmdlet("First", "List")]
public class FirstList : Cmdlet
{
    [Parameter(Mandatory = true, ValueFromPipeline = true, ValueFromPipelineByPropertyName = true)]
    public object Input { get; set; }
    [Parameter(Position = 0, Mandatory = true)]
    public ScriptBlock ScriptBlock { get; set; }
    protected override void ProcessRecord()
    {
        var output = ScriptBlock.InvokeWithContext(null, new List<PSVariable>
        {
            new PSVariable("input", Input),
        })[0];
        if (output.ToString() != "True") return;
        WriteObject(Input);
        throw new PipelineStoppedException();
    }
    protected override void EndProcessing()
    {
        Error.NoMatch();
    }
}

使用Select -First，我可以做以下操作:

$a = 1..10 | Select -First 1
#$a is 1

但是在我的实现中:

$a = 1..10 | First-List { $input -ge 5 }
#$a should be assigned 5, but it is not

但是1..10 | First-List { $input -ge 5 }确实输出了5。

更新2:

似乎Select-Object实际上抛出了StopUpstreamCommandsException。

也有一个反馈在这里提供- https://connect.microsoft.com/PowerShell/feedback/details/768650/enable-users-to-stop-pipeline-making-stopupstreamcommandsexception-public

internal static class Error
{
    private static readonly Type StopUpstreamCommandsExceptionType =
        Assembly.GetAssembly(typeof (PSCmdlet))
            .GetType("System.Management.Automation.StopUpstreamCommandsException");
    internal static Exception StopUpstreamCommandsException(Cmdlet cmdlet)
    {
        var stopUpstreamCommandsException = (Exception) Activator.CreateInstance(StopUpstreamCommandsExceptionType,
            BindingFlags.Default | BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public,
            null,
            new Object[] {(InternalCommand) cmdlet},
            null
            );
        return stopUpstreamCommandsException;
    }
}