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 = "41,43";
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);
}
}
解决方法
string addressBookEntryIds = "41,43";
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();
