O.K。我能做到这一点与3号线code。

 布尔hasItemNo;
的foreach（字符串货号在existedThings）
    hasItemNo = thingsToSave.Contains（货号）;
 

不过，看起来很脏。

我只是想知道是否有更好的解决方案。

  INT [] ID1 = {44，26，92，30，71，38};
 INT [] ID2 = {39，59，83，47，26，4，30};

 IEnumerable的＆LT; INT＆GT;无论= id1.Intersect（ID2）;

 的foreach（在两种INT id）的
     Console.WriteLine（ID）;

 //Console.WriteLine（（both.Count（）大于0）的ToString（））;
 Console.WriteLine（both.Any（）的ToString（））;
 

查找的 Enumerable.Intersect方法

IEnumerable<String> existedThings = 
        from mdinfo in mdInfoTotal select mdinfo.ItemNo;

IEnumerable<String> thingsToSave = 
        from item in lbXReadSuccess.Items.Cast<ListItem>() select item.Value;

Here are two IEnumerable.

I want to check whether a value in existedThings exist in thingsToSave.

O.K. I can do that with 3 line code.

bool hasItemNo;
foreach(string itemNo in existedThings)
    hasItemNo= thingsToSave.Contains(itemNo);

But, It looks dirty.

I just want to know if there is better solution.

 int[] id1 = { 44, 26, 92, 30, 71, 38 };
 int[] id2 = { 39, 59, 83, 47, 26, 4, 30 };

 IEnumerable<int> both = id1.Intersect(id2);

 foreach (int id in both)
     Console.WriteLine(id);

 //Console.WriteLine((both.Count() > 0).ToString());
 Console.WriteLine(both.Any().ToString());

Look for the Enumerable.Intersect Method