Convert String To ListBox

Question

1.00/5 (1 vote)

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So I have this code

VB

Dim value As String = My.Computer.FileSystem.ReadAllText(Directory).Skip(4).ToArray()

ListBox1.Items.AddRange(value)

But i get this error

Overload resolution failed because no accessible 'Add Range' can be called with these arguments:<br />
'Public Sub AddRange(items() As Object)": Value of type 'string' cannot be converted to '1-dimensional array of object'.<br />
'Public Sub AddRange(value As<br />
System.Windows.Forms.ListBox.ObjectCollection)': Value of type<br />
'string' cannot be converted to<br />
'System.Windows.Forms.ListBox.ObjectCollection'.

Any ideas how i can do this above please.

i am wanting the directory which is a textfile to read the lines and then import them into the listbox please

Posted 22-May-13 5:51am

User 10035433

Updated 22-May-13 5:56am

Maciej Los

v2

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Thomas Daniels · Accepted Answer · 2013-05-22T05:55:00

Solution 1

Hi,

Try:

VB

Dim value As String() = My.Computer.FileSystem.ReadAllText(Directory).Skip(4).ToArray()

[EDIT]

FileSystem.ReadAllText returns a string, and you skip some chars. If you call the ToArray method, you get an array of Chars.
So, try this:

VB

Dim value As String = New String(My.Computer.FileSystem.ReadAllText(Directory).Skip(4).ToArray())
 
ListBox1.Items.Add(value)

The Add method adds a single value to the ListBox.

[EDIT #2]

sampleme90 wrote:
it only imports in to the listbox only one line and that is the first line i got a feeling it is bacause of the readalltext and i am wanting something like readalllines

Instead of the My.Computer.FileSystem.ReadAllText method, you can use the System.IO.File.ReadAllLines[^] method:

VB

Dim value As String() = System.IO.File.ReadAllLines(Directory)

ListBox1.Items.AddRange(value)

Hope this helps.

Posted 22-May-13 5:55am

Thomas Daniels

Updated 22-May-13 7:24am

v6

Comments

[no name] 22-May-13 11:57am

ok now it says

Value of type '1-dimensional array of Char' cannot be converted to '1-dimensional array of string' because 'Char" is not derived from string'

for the

My.Computer.FileSystem.ReadAllText(Directory).Skip(4).ToArray()

any ideas please :) thanks for the help so far

Thomas Daniels 22-May-13 12:08pm

I updated my answer.

[no name] 22-May-13 12:21pm

afraid this still doesnt work. It doesn't import all my lines only one line. Any ideas else please

Thomas Daniels 22-May-13 12:29pm

What do you mean exactly?

[no name] 22-May-13 12:31pm

it only imports in to the listbox only one line and that is the first line i got a feeling it is bacause of the readalltext and i am wanting something like readalllines :(

Thomas Daniels 22-May-13 12:52pm

I updated my answer.

[no name] 22-May-13 12:58pm

no it doesn't.......

Value of type 'integer' cannot be converted to '1-dimensional array of Char'

which belongs to the "1"

and also an syntax error for

the {

at the beginning of the environment new line bit

any other suggestions please

Thomas Daniels 22-May-13 13:03pm

I updated my answer. I changed New String(1) into New String(0).

[no name] 22-May-13 13:06pm

i still have a syntax on the "{" before the environment.new line

also

")" expected for the end of the "New String(0)

but even if added i get an error

Thomas Daniels 22-May-13 13:10pm

Which error do you get?

[no name] 22-May-13 13:13pm

value of type 'integer' cannot be converted to '1-dimensional array of Char"

any ideas please

Thomas Daniels 22-May-13 13:25pm

I updated my answer. Instead of the My.Computer.FileSystem.ReadAllText method, you can also use the System.IO.File.ReadAllLines method, because the ReadAllLines method returns a string array.

[no name] 22-May-13 13:37pm

code work but it DOESNT put the lines in the listbox instead it just loads in the list box

"String[]Array any other suggestions please

Thomas Daniels 22-May-13 13:41pm

What do you mean exactly? My code adds all lines to the ListBox.

[no name] 22-May-13 13:43pm

what is the full code you have that you are looking at please? can you comment the code that you are looking at below please

Thomas Daniels 22-May-13 13:45pm

I can't provide full code, because I don't know your full code.

[no name] 22-May-13 13:47pm

ok my full code that i have is

Dim value As String() = System.IO.File.ReadAllLinea(Directory)
listbox1.Items.Add(value)

is this the same as yours

Thomas Daniels 22-May-13 13:53pm

Is the list box added to the form?

[no name] 22-May-13 13:55pm

yes :)

Thomas Daniels 22-May-13 13:56pm

And my code doesn't add the lines to the list box?

[no name] 22-May-13 13:59pm

nope just adds to the listbox this

"String[]Array"

which is not any of my lines in the texfile in my directory?

any other suggestions please

Thomas Daniels 22-May-13 14:03pm

The code in my last block is NOT

<small>Dim value As String() = System.IO.File.ReadAllLines(Directory)
 
ListBox1.Items.Add(value)</small>

but it's

<small>Dim value As String() = System.IO.File.ReadAllLines(Directory)
 
ListBox1.Items.AddRange(value)</small>

. Use the AddRange method and not the Add method.

[no name] 22-May-13 14:07pm

ok nearly there with this

just how do i do the

.skip(4).ToArray(); at the end of my directory bit please.

Basically it should skip the 4 lines at the top of the textfile and list in the textfile all the ones below

thanks so far, very nearly there :)

Thomas Daniels 22-May-13 14:10pm

Try this:

<small>Dim value As String() = System.IO.File.ReadAllLines(Directory) ListBox1.Items.AddRange(value.Skip(4).ToArray())</small>

[no name] 22-May-13 14:11pm

ok thanks so much working now :)

Thomas Daniels 22-May-13 14:11pm

You're welcome!