寻找一种干净的方法将字符串列表转换为C#中的有效List <long>

Question

我希望找到一种更好的方法(可能有一个很好的linq表达式)将像"41,42x,43"这样的字符串列表转换为有效long的列表.下面的代码有效,但感觉很难看.

string addressBookEntryIds = "41,42x,43";
var ids = addressBookEntryIds.Split(new[] {',', ';'}, StringSplitOptions.RemoveEmptyEntries);
var addressBookEntryIdList =new List<long>();
foreach (var rec in ids)
{
    long val;
    if (Int64.TryParse(rec, out val))
    {
        addressBookEntryIdList.Add(val);
    }
}

Answer 1

string addressBookEntryIds = "41,42x,43";

Func<string, long?> safeParse = (s) => {
            long val;
            if (Int64.TryParse(s, out val))
            {
                return val;
            }
            return null;    
};


var longs = (from s in addressBookEntryIds.Split(new[] {',', ';'}, StringSplitOptions.RemoveEmptyEntries)
            let cand = safeParse(s)
            where cand.HasValue
            select cand.Value).ToList();