VB.Net LINQ 求数组并集

 Sub Main()

        Dim a() As String = {"一", "五", "3", "4"}
        Dim b() As String = {"二", "3", "4", "七", "八", "九"}

        Dim c() = a.Union(b).Distinct.ToArray
        For Each i In c
              Console.WriteLine(i)
        Next

        Console.ReadLine()

End Sub

解决方案的项目要引用：
System.Data
System.Xml
System.Xml.Linq