How to convert List(Of String) to Object()?

Question

I know what you're thinking, why do you want to convert in that direction? Basically, I have to make modern code palatable for a legacy COM+ app.I've seen a lot of conversion ideas going the other direction.

The only thing I've come up with it actually looping through the List(Of String). Perhaps this is the best/only way.

This works, but seems cludgey.
groupNames is a List(Of String)

Dim groups() As Object = New Object() {}

If groupNames IsNot Nothing Then
    groups = New Object(groupNames.Count - 1) {}
    For i = 0 To groupNames.Count - 1
        groups(i) = groupNames(i)
    Next
End If

Not sure this is what you're looking for groupNames.Cast<Object>().ToArray() — Sriram Sakthivel
– Sriram Sakthivel, Commented Dec 26, 2013 at 15:48

Steven Doggart · Accepted Answer · 2013-12-26 15:49:36Z

1

It's a little cleaner if you use the LINQ Cast extension method:

Dim strings As New List(Of String)({"1", "2"})
Dim objects() As Object = strings.Cast(Of Object).ToArray()

answered Dec 26, 2013 at 15:49

Steven Doggart

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1 Comment

Aaron Palmer Over a year ago

I still have to do a null check on "strings" because it's passed in as a parameter to my method... but this is what I was looking for. Thanks.

danish · Accepted Answer · 2013-12-26 15:49:30Z

0

You can use good old array here. There is no need to lose strong typed behaviour.

answered Dec 26, 2013 at 15:49

danish

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7 Comments

Sriram Sakthivel Over a year ago

You're talking about covariance I think, that is broken, will fail when try to set a value.

danish Over a year ago

I am referring to string array.

Sriram Sakthivel Over a year ago

but op is asking for object[]

Aaron Palmer Over a year ago

I do need object[] because the COM component throws a type mismatch when it gets a string[]

Aaron Palmer Over a year ago

VB6 typing is different than .net.

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