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。

感谢。

Answer 1

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

Answer 2

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

对于任何失败的转化，这将返回-1。

Answer 3

你可以这样做：

string TheString = "443,432,546,4547,4445,2,132"; //actually, about 1000 entries
int temp=0;
var TheListOfIDs= TheString
                  .Split(',')
                  .Where (ts =>int.TryParse(ts,out temp))
                  .Select (ts =>temp )
                  .ToList();

Answer 4

警告：未尝试过。

string[] myString = TheString.Split(',');

int leadId;
var theListOfLeadIds = (from myString in myString where int.TryParse(myString, out leadId) select int.Parse(myString)).ToList<int>();

意味着您只能成功解析值...

使用TryParse的整数列表的整数字符串

4 个答案: