我如何检查文件是否存在，如果不存在，则终止版本?
问题描述：
如何停止构建，并在文件不存在时通知用户?我知道如果文件存在，我可以使用可用的任务来设置属性，但是我不确定如何停止构建并回显某些内容.
How can I stop a build, and notify the user if a file does not exist? I know I can use the available task to set a property if a file exists, but I'm not sure how I would stop a build and echo something.
如果可能的话，我想坚持核心任务.
I would like to stick with core tasks if possible.
答
您可以使用失败任务来满足您所有失败的需求.该页面上的最后一个示例实际上就是您所需要的
You can use the fail task for all your failing needs. The last example on that page is actually pretty much what you need
<fail message="Files are missing.">
<condition>
<not>
<resourcecount count="2">
<fileset id="fs" dir="." includes="one.txt,two.txt"/>
</resourcecount>
</not>
</condition>
</fail>