public static string[] GetAllUsers(SPList splist, string field)
{
//先确定你要获取哪栏（列）的不重复值，这里把voteboxlist换成你的列表实例，“得票人”换成你要处理的列名
SPField distinctfield = splist.Fields[field];
//准备一个二维对象数组做输出参数来接收列的结果（即你最后要的不重复值）
object[,] distinctresult;
//调用getdistinctfieldvalues后distinctresult就是不重复的值，而返回resultcount 就是有多少个值
uint resultcount = splist.GetDistinctFieldValues(distinctfield, out distinctresult);
string[] names = new string[resultcount];
var results = from t in splist.Items.Cast <SPListItem>()
select new { t.Title };
var disresults = Enumerable.Distinct(results);
//for (int i = 0; i < resultcount; i++)
//{
// names[i] = SPEncode.HtmlEncode(resultcount.GetValue(0, i).ToString());
//}
return(names);
}
