两个字符串，使用正则表达式来处理，大家来看看
1、原始串

<?xml version='1.0' encoding='utf-8'?><Response><BusinessNo>1234567890</BusinessNo><MessageCode>-100</MessageCode></Response>


2、配置串

<?xml version='1.0' encoding='utf-8'?><Response><BusinessNo>{abc}</BusinessNo><MessageCode>{def}</MessageCode></Response>

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3、说明
配置串中的{xxx}格式，是我需要获得的数值

大家看看如何采用正则表达式来获得

[解决办法]

C# code

 static void Main(string[] args)            {               string str = @"<?xml version='1.0' encoding='utf-8'?><Response><BusinessNo>1234567890</BusinessNo><MessageCode>-100</MessageCode></Response>";                Regex re = new Regex(@"<\?xml\s* version='1.0'\s*encoding='utf-8'\?><Response><BusinessNo>([^<]+)</BusinessNo><MessageCode>([^<]+)</MessageCode></Response>", RegexOptions.None);                Match ma = re.Match(str);                  Console.WriteLine(ma.Groups[1].Value);  //1234567890                Console.WriteLine(ma.Groups[2].Value);  //-100                Console.ReadLine();                                            }