Reading Textfile into Listbox is soooo slow

[mrdutchie]

Hi,

 

I am trying to read a Textfile with 40.000 lines into a listbox

so I am reading each line and add it to the listbox,

but that takes about 15-20 seconds... way to slow :(

 

Isn't there a faster way to do it? Cause I found a routine

that only takes 4-8 seconds but that reads it into a Datagrid

and that's not what I want.

[Bucky]

Don't use the ReadLine or ReadToEnd methods of the reader.

Instead, get the Length of stream, then Read() the entire thing into

a Byte array, and then convert it to a string using

System.Text.Encoding.[whatever encoding].GetString().

[mrdutchie]

Thanks, I will look into that again.

I remember trying that once before and never got it to work :(

[mrdutchie]

OK, I have this now and it reads it very fast into s(0)

but still adding to the listviewer takes forever.

 

Dim s As Array

Dim w As String

Dim f As String = "C:\newsgroups.txt"

Dim stream_reader As New IO.StreamReader(f)

s = (Split(stream_reader.ReadToEnd, vbCrLf))

stream_reader.Close()

' MsgBox("done") This takes only 1 second and

' all the data is in s(0)

 

Dim a() As String = s(0).Split(Chr(10))

For x = 1 To a.Length - 1

ListView1.Items.Add(a(x))

Next

 

 

What am I missing here?