问2个小函数？

Question

string aa="12,23,34,45,5667,";
1，怎么查找aa中是否包含"23,"
2，返回aa中有几个 ,逗号我是新人，哪里有C＃函数手册下载啊？

Answer 1

using System.Text.RegularExpressions;string str43 = "12,23,34,45,5667,";
if (str43.IndexOf("23,") >= 0)
{
    //包含"23，"
}
else
{
    //不包含"23，"
}int intCount = Regex.Matches(str21,"[,]").Count;

Answer 2

swordragon(古道热肠) 说的没错

Answer 3

swordragon(古道热肠) Good!支持