LINQ"拉链"在字符串数组 [英] LINQ "zip" in String Array
本文介绍了LINQ"拉链"在字符串数组的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
说,有两个数组:
String[] title = { "One","Two","three","Four"};
String[] user = { "rob","","john",""};
我需要过滤掉上述阵列时,用户
值为空再加入或拉链两者结合起来。最终输出应该是这样的:
I need to filter out the above array when the user
value is Empty then join or zip the two together. Final Output should be like:
{ "One:rob", "three:john" }
如何才能做到这一点使用LINQ?
How can this be done using LINQ?
推荐答案
这听起来像你真的想拉链的数据一起(不参加) - 即两两匹配;那是对的吗?如果是这样,简单地说:
It sounds like you actually want to "zip" the data together (not join) - i.e. match pairwise; is that correct? If so, simply:
var qry = from row in title.Zip(user, (t, u) => new { Title = t, User = u })
where !string.IsNullOrEmpty(row.User)
select row.Title + ":" + row.User;
foreach (string s in qry) Console.WriteLine(s);
使用邮编
操作=http://blogs.msdn.com/ericlippert/archive/2009/05/07/zip-me-up.aspx>这里:
using the Zip
operation from here:
// http://blogs.msdn.com/ericlippert/archive/2009/05/07/zip-me-up.aspx
public static IEnumerable<TResult> Zip<TFirst, TSecond, TResult>
(this IEnumerable<TFirst> first,
IEnumerable<TSecond> second,
Func<TFirst, TSecond, TResult> resultSelector)
{
if (first == null) throw new ArgumentNullException("first");
if (second == null) throw new ArgumentNullException("second");
if (resultSelector == null) throw new ArgumentNullException("resultSelector");
return ZipIterator(first, second, resultSelector);
}
private static IEnumerable<TResult> ZipIterator<TFirst, TSecond, TResult>
(IEnumerable<TFirst> first,
IEnumerable<TSecond> second,
Func<TFirst, TSecond, TResult> resultSelector)
{
using (IEnumerator<TFirst> e1 = first.GetEnumerator())
using (IEnumerator<TSecond> e2 = second.GetEnumerator())
while (e1.MoveNext() && e2.MoveNext())
yield return resultSelector(e1.Current, e2.Current);
}
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