c#中的字符串数组。从一个字符串数组中删除在另一个字符串数组中的元素

Question

我有两个字符串数组 -

            string[] One = new string[3];

            One[0] = "Pen";          
            One[1] = "Pencil";          
            One[2] = "card"; 

和，

            string[] Two = new string[2];

            Two[0] = "card";          
            Two[1] = "drive";      

现在，我想从这两个中创建一个新的字符串数组，这样最终结果不包含 Two 数组的任何元素。即它应该只有“Pen”、“Pencil”。

Answer 1

你可以使用 Linq -

var res = One.Where(x => Two.Find(x) == null);

甚至更好：

        string[] One = new string[3];

        One[0] = "Pen";
        One[1] = "Pencil";
        One[2] = "card";
        string[] Two = new string[2];

        Two[0] = "card";
        Two[1] = "drive";

        var res = One.Except(Two);

Answer 2

你需要类似不相交的东西

         string[] One = new string[3];

            One[0] = "Pen";          
            One[1] = "Pencil";          
            One[2] = "card";

        string[] Two = new string[2];

            Two[0] = "card";          
            Two[1] = "drive";

        var nonintersectOne = One.Except(Two);   
        foreach(var str in  nonintersectOne)
           Console.WriteLine(str);

        // Or if you want the non intersect from both
        var nonintersectBoth = One.Except(Two).Union(Two.Except(One)).ToArray();
        foreach(var str in  nonintersect)
           Console.WriteLine(str);

输出 1：

笔

铅笔

输出 2：

笔

铅笔

开车

Answer 3

这个简单的 linq 查询可以给你结果。

var res = One.Except(Two);

此外，如果您需要忽略大小写，请使用上述方法的重载版本：

var res = One.Except(Two, StringComparer.OrdinalIgnoreCase);

或，等价。

var res  = One.Where(x=>!Two.Contains(x)).ToArray();