Converting String Builder to Strings Array in VB.NET

Question

I have a RadComoboBox with check boxes and I want to loop through the check boxes with String Builder. After getting the values in that format: {1,2,3,4} I want to convert it to stringArray in that format (1,2,3,4) Can anyone please show me how I can do this?

This is my code:

Dim sbPeopleTypes As New StringBuilder()
Dim colGroups As IList(Of RadComboBoxItem) = rcbFilterPersonType.CheckedItems
For Each item As RadComboBoxItem In colGroups
     sbPeopleTypes.Append(item.Value + ",")
Next

aspx code:

<telerik:RadComboBox runat="server" 
                    CheckBoxes="true" 
                    ID="rcbFilterPersonType" 
                    EmptyMessage="Select Person Type" Enabled="True">
</telerik:RadComboBox>

Steven Doggart · Accepted Answer · 2013-12-17 18:45:23Z

5

You can get the array by using the string's Split method, like this:

Dim myArray() As String = sbPeopleTypes.ToString.Split(","c)

However, unless you need to use the StringBuilder, for some other reason, it would be better to use a list, like this:

Dim peopleTypes As New List(Of String)()
For Each item As RadComboBoxItem In colGroups
     peopleTypes.Add(item.Value)
Next

Then, if you really need it as an array, you can convert it like this:

Dim myArray() As String = peopleTypes.ToArray()

Even if you did need it formatted as a comma delimited string, you could still build that from the list easily, without a StringBuilder, like this:

Dim csv As String = String.Join(",", peopleTypes)

Alternatively, since the RadComboBox.CheckedItems property is an IList(Of RadComboBoxItem), you could use the Select LINQ extension method to get the values as a list or array without the For loop, like this:

Dim myArray() as String = rcbFilterPersonType.CheckedItems.Select(Function(x) x.Value).ToArray()

edited Dec 17, 2013 at 18:45

answered Dec 17, 2013 at 18:30

Steven Doggart

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2 Comments

ps2goat Over a year ago

He also knows the length of the array, so he could just create an array Dim arPeopleTypes(colGroups.Count-1) as String, then do a for loop with a counter to set them. Lists are great when used dynamically or where flexibility is needed (list, ienumerable, toarray, queryable, etc), but when counts are fixed, a straight-array approach also works. However, performance on this scale would not be noticeable.

Steven Doggart Over a year ago

@ps2goat, excellent point. That would be especially true if having the results as an array is really necessary. If not, you could still get most of the performance benefits of an array by passing the size into the list's constructor so that it gets allocated initially and doesn't need to resize as items are added.

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