int.TryParse 返回一个布尔值，如果成功则返回true，否则返回false.您需要将其包装在if块中，然后使用该逻辑进行操作.

int.TryParse returns a boolean, true if it succeeded and false if not. You need to wrap this in a if block and do something with that logic.

if(int.TryParse(y, out x))
    print (x); // y was able to be converted to an int
else
    // inform the caller that y was not numeric, your conversion to number failed

至于为什么不转换您的电话号码，我不敢说，直到您发布了字符串值是什么.

As far as why your number is not converted I could not say until you post what the string value is.