c# - String.Format 未格式化电话号码

Question

String.Format("{0:###-###-####}", customer.ContactHome); //NOT working (9891205789)

但是

String.Format("{0:###-###-####}", Convert.ToInt64(customer.ContactHome)); //Works fine (989-120-5789)

但由于某些原因我不想投电话号码。如何在不转换的情况下格式化电话号码？

Answer 1

如果 customer.ContactHome 是字符串，你可以这样做:

Regex.Replace(customer.ContactHome, "(\d\d\d)(\d\d\d)(\d\d\d\d)", "$1-$2-$3");

或

customer.ContactHome.Substring(0,3) + "-" +
customer.ContactHome.Substring(3,3) + "-" + 
customer.ContactHome.Substring(6,4);