Converting StringBuilder to String 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 this result into a string.

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

How can I convert StringBuilder to a string and split it to string like that (1,2,3,4)

aspx code:

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

If you just want an array of string. Why no create it right away instead of using a string builder? — the_lotus
– the_lotus, Commented Dec 17, 2013 at 14:49

p.s.w.g · Accepted Answer · 2013-12-17 04:56:33Z

3

To convert a StringBuilder to a string, simply call ToString:

Dim str As String = sbPeopleTypes.ToString()

But you will probably want to add "{" and "}" around the value as well.

Alternatively, you can skip the StringBuilder and do something like this:

Dim colGroups As IList(Of RadComboBoxItem) = rcbFilterPersonType.CheckedItems
Dim str As String = "{" + String.Join(",", colGroups.Select(Function(x) x.Value)) + "}"

Now, if what you really wanted was an array of strings, there's no need for any StringBuilder or string concatenation at all. You can simply use a little Linq:

Dim strArr As String() = colGroups.Select(Function(x) x.Value).ToArray()

edited Dec 17, 2013 at 4:56

answered Dec 17, 2013 at 4:40

p.s.w.g

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6 Comments

user3002885 Over a year ago

It's not working my friend... I tried to do: Dim strArr() As String strArr = sbPeopleTypes.ToString() .....I'm getting that error '1-dimensional array of String' cannot be converted to 'String'

p.s.w.g Over a year ago

@user3002885 Are you trying to create a single string or an array of strings? Your question suggests you just want a single string.

user3002885 Over a year ago

arrays of string so I thought to convert it into a string and after that to an array of strings can you please help me?

p.s.w.g Over a year ago

@user3002885 Converting a list to a string, then splitting the string to get an array is like a Rube Goldberg machine--it vastly overcomplicates things. See my updated answer for a solution to get a string array .

user3002885 Over a year ago

p.s.w.g I'm getting 'Select' is not a member of 'System.Collections.Generic.IList(Of Telerik.Web.UI.RadComboBoxItem)'.

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