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Process.Start(info) 返回的是一个 Process 对象，相关文档在这里。
Process 有几个事件，Exited 事件在进程结束后触发。ErrorDataReceived 在有错误输出时触发，OutputDataRecevied在有正常输出时触发。
还有几个属性，HasExited 检查是否已经结束，ExitCode 获取结束代码，ExitTime 获取结束时间。不过使用后两个属性之前都需要先判断 HasExited，因为如果进程还没结束，获取结束代码和时间都会引发异常。
2016-11-12 13:40:14
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