在VB.NET中使用键显示集合数据

Question

I have made Collection with keys but I am unable to retrieve this information. This is my code:

Dim test As Collection = New Collection
test.Add("This is a test", "testkey")
MsgBox(test("testkey").ToString)

I'm getting an error on last line:

Argument 'Index' is not a valid value.

What's wrong?

Answer 1

If you want to store key/value pairs use, Dictionary . Here is how you can do it.

Dim dictionary As New Dictionary(Of String, String)
dictionary.Add("testkey", "This is a test")
MsgBox(dictionary("testkey"))