List与String的相互转换

List转字符串，用逗号隔开

List<string> list = new List<string>();
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<string> { 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<string, int>(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

 

 

//按指定数量对List分组

public static List<List<T>> GetListGroup<T>(this List<T> list, int groupNum)
{
List<List<T>> listGroup = new List<List<T>>();
for (int i = 0; i < list.Count(); i += groupNum)
{ listGroup.Add(list.Skip(i).Take(groupNum).ToList());
}
return listGroup;
}
}