字符串过滤
string str="李四,张三,李四,王五,赵六,张三"
怎么把这个字符串中相同的项过滤掉。只留一个啊，逗号不能去掉
我要下面这样的效果
str="李四,张三,王五,赵六"


[解决办法]
先用Split按逗号分开，得到一个数组
用LINQ，在拼接起来
[解决办法]

C# code

public static string filterRepeatChar(string _val){ string _str = string.Empty; string[] strArray = _val.Split(','); for (int i = 0; i < strArray.Length; i++) {  for (int j = i + 1; j < strArray.Length; j++)  {   if (strArray[j] == strArray[i])   {    strArray[i] = string.Empty;   }  }  if (strArray[i]!=string.Empty)   _str += strArray[i] + ","; } if (_str.LastIndexOf(",") > -1)  _str = _str.Substring(0, _str.Length - 1); return _str;}
[解决办法]
C# code
            string str = "李四,张三,李四,王五,赵六,张三";            var vs = from s in str.Split(',') group s by s into p select new { p.Key, num = p.Count() };            string ss = string.Empty;            foreach (var v in vs)            {                if (string.IsNullOrEmpty(ss))                    ss = v.Key;                else                    ss = ss + ","+v.Key;            }            MessageBox.Show(ss);
[解决办法]
C# code
  string strwr = "李四,张三,李四,王五,赵六,张三";            var wq = from p in strwr.Split(',').Distinct()                     select p;                               string rw = "";            foreach (var kk in wq)            {                rw += kk.ToString()+",";            }            rw = rw.TrimEnd(',');
[解决办法]
用个冒泡法就可以解决了，相同的去掉
[解决办法]
string.Join(",", str.Split(',').Distinct())