List转字符串，用逗号隔开List
     
       list = new List
      
       ();list.Add("a");list.Add("b");list.Add("c");string s = string.Join(",", list.ToArray());ModuleCodes = request.moduleCodes.IndexOf(',') > 0 ? request.moduleCodes.Split(',').Distinct().ToList() : new List
       
         { request.moduleCodes }
       
      
     

 

 

list to array:

int[] grades = list2.Select(t => t.grade).Distinct().ToArray();  string[] lessons = list2.Select(t => t.lesson).Distinct().ToArray(); list初始化

   CodeList = new List<string>() { "001", "002", "003" }, 

CodeList = (new String[]{  "001", "002", "003" }).ToList(),

 

 string[] selist = pic.TrimEnd(',').Split(',');

price.MinPrice = decimal.Parse(selist[0]);

 

price.MaxPrice = decimal.Parse(selist[1]);

 

 

 

字符串数组转int型list

 

 

 

list添加元素：

  codelist.AddRange(new String[] { "A-200", "B-200" }); 

 

string[] productidarray=search.SearchDetail.TempProductId.Split(new string[] { "，", ",", "\r\n", "\n" }, StringSplitOptions.RemoveEmptyEntries);  //分割字符串同时去除空格

string TempProductId = string.Join(",", productidarray).Trim().TrimEnd(',')   //去除空

string[] inputpids = productIds.IndexOf(',') > 0 ? productIds.Split(',').Distinct().ToArray() : new string[] { productIds };                    int[] outputpids = Array.ConvertAll
       
        (inputpids, delegate(string s)                    {                        var val = 0;                        int.TryParse(s, out val);                        return val;                    }); req.ProductIds = outputpids.Where(c=>c>0).ToList();//string转int数组