使用TryParse的整数列表的整数字符串

Question

我有这段代码:

TheString = "443,432,546,4547,4445,2,132"; //actually, about 1000 entries    
List<int> TheListOfIDs = new List<int>();   
TheListOfLeadIDs = from string s in TheString.Split(',')
                   select Convert.ToInt32(s)).ToList<int>();

我知道我可以使用try catch来确保转换不会引发错误,但我想知道如何在linq语句中使用TryParse来完成这项工作.

谢谢.

Answer 1

TheListOfIDs = TheString.Split(',')
                        .Select(s => 
                        {
                            int i;
                            return Int32.TryParse(s, out i) ? i : -1;
                        }).ToList();

这将返回-1任何失败的转换.

Answer 2

TheListOfLeadIDs = (from string s in TheString.Split(',')
                    let value = 0
                    where int.TryParse(s, out value)
                    select value).ToList<int>();