View Data in Textbox

  • Thread starter Thread starter John Smith
  • Start date Start date
J

John Smith

I have a form doing a large process. While this form is doing its
processing I want to write a status to a Textbox of where it is at in the
process. Similar to having a log file but within a textbox. As it reaches
its mark it adds a line to the textbox "Step 2 is complete." or "Step 3
Failed because of...". My problem is that the text within the textbox does
not display until after all of the processing is complete. How can I get
the text to display when it reaches each specific process? Thanx in advance
 
Two ways. one and simple way is to use Application.DoEvents() after you
update the text box but a lot of people say to avoid using that function.
The more complicated way is to use threading to do the processing in a
seperate thread from the UI.

Chris
 
John,

You mean something as this
\\\
Private Sub Form1_Activated(ByVal sender _
As Object, ByVal e As System.EventArgs) Handles MyBase.Activated
For i As Integer = 1 To 100000000
If i Mod 100 = 0 Then
TextBox1.Show()
End If
TextBox1.AppendText(i.ToString)
Next
End Sub
///

I hope this helps?

Cor
 
John Smith said:
I have a form doing a large process. While this form is doing its
processing I want to write a status to a Textbox of where it is at in the
process. Similar to having a log file but within a textbox. As it
reaches
its mark it adds a line to the textbox "Step 2 is complete." or "Step 3
Failed because of...". My problem is that the text within the textbox
does
not display until after all of the processing is complete. How can I get
the text to display when it reaches each specific process?
Click to expand...

Solution 1:

\\\
With Me.Label1
.Text = ...
.Refresh()
End With
Application.DoEvents() ' See documentation.
///

Solution 2:

Multithreading + Windows Forms:

<URL:http://msdn.microsoft.com/library/en-us/dnforms/html/winforms06112002.asp>
<URL:http://msdn.microsoft.com/library/en-us/dnforms/html/winforms08162002.asp>
<URL:http://msdn.microsoft.com/library/en-us/dnforms/html/winforms01232003.asp>

<URL:http://www.devx.com/dotnet/Article/11358/>

<URL:http://msdn.microsoft.com/library/e...SystemWindowsFormsControlClassInvokeTopic.asp>

Multithreading in Visual Basic .NET (Visual Basic Language Concepts)
<URL:http://msdn.microsoft.com/library/en-us/vbcn7/html/vaconthreadinginvisualbasic.asp>

Sample:

FileSystemEnumerator
<URL:http://dotnet.mvps.org/dotnet/samples/filesystem/downloads/FileSystemEnumerator.zip>
 
Herfried, maybe your example here can get you to answer a question I've
wondered about for a while.

With Me.Label1
.Text = ...
.Refresh()
End With

The idea behind the With clause is it allows for faster execution since the
"Me" ojbect doesn't have to be resolved 2 times in your example. But you
could rewrite your sample w/o the Me

With Label1
.Text = ...
.Refresh()
End With

In this case there wouldn't be any inhancement since you are not actually
eliminating the dot. Am I correct in my thinking?

Chris
 
Chris,

Chris said:
Herfried, maybe your example here can get you to answer a question I've
wondered about for a while.

With Me.Label1
.Text = ...
.Refresh()
End With

The idea behind the With clause is it allows for faster execution since
the "Me" ojbect doesn't have to be resolved 2 times in your example. But
you could rewrite your sample w/o the Me

With Label1
.Text = ...
.Refresh()
End With

In this case there wouldn't be any inhancement since you are not actually
eliminating the dot. Am I correct in my thinking?
Click to expand...

The 'Me.' is resolved even if it's not explicitly written. In this case I
used With type the code faster ;-).
 
Chis,

Not true,

The "Me" is only for the programmer, it does nothing at runtime.

The With clause creates an extra reference in a program. In this case it
will be slower than a program without a With clause, however think than
probably in parts of nanoseconds.

I hope this gives some ideas?

Cor


"Chris, Master of All Things Insignificant"
..
Herfried, maybe your example here can get you to answer a question I've
wondered about for a while.

With Me.Label1
.Text = ...
.Refresh()
End With

The idea behind the With clause is it allows for faster execution since
the "Me" ojbect doesn't have to be resolved 2 times in your example. But
you could rewrite your sample w/o the Me

With Label1
.Text = ...
.Refresh()
End With

In this case there wouldn't be any inhancement since you are not actually
eliminating the dot. Am I correct in my thinking?

Chris
Click to expand...
 
Back
Top