C#去掉字符串中连续重复的字符

去掉字符串中重复的字符

 static string DelectStr(string str)
{
            string str2 = string.Empty;
            string[] s = new string[str.Length];
            for (int i = 0; i < str.Length; i++)
            {
                s[i] = str.Substring(i, 1);
            }
            for (int i = 0; i < s.Length; i++)
            {
                if (i < s.Length - 1)
                {
                    if (s[i] == s[i + 1])
                    {

                    }
                    else
                    {
                        str2 += s[i];
                        
                    }
                }
                else
                {
                    str2 += s[i];
                }
            }
            return str2;
}

去除前：",,,。。标标，，"
去除后：",。标，"

去掉字符中重复的标点符号,保留最后一个标点

public static string DelectStr(string str)
        {
            string str2 = string.Empty;
            string[] s = new string[str.Length];
            Regex reg = new Regex(@"[\,\，\。\?\!\']");
            for (int i = 0; i < str.Length; i++)
            {
                s[i] = str.Substring(i, 1);
            }
            for (int i = 0; i < s.Length; i++)
            {
                if (i < s.Length - 1)
                {
                    if (reg.IsMatch(s[i]) && reg.IsMatch(s[i + 1]))
                    {

                    }
                    else
                    {
                        str2 += s[i];

                    }
                }
                else
                {
                     str2 += s[i];
                }
            }
            return str2;
        }

去除前：",,,。。标标，，"
去除后："。标标，"