.net list<string> 转list<int>。.net 字符串集合转Int集合。.net string集合转int集合。.net list string转list int。list string 转list double

.net list string 转list int
代码如下：

var strList = new List<string>{"1","2","3"};
var intList = strList.Select<string,int>(x =>Convert.ToInt32(x));

list string 转list double
代码如下：

List<string> result = _lnglat_data.Split(",").ToList();
List<double> intList = result.Select<string, double>(x => Convert.ToDouble(x)).ToList();
return intList;