Private Sub btnFind_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnFind.Click
str = Form1.TextBox1.Text
strfind = txtFind.Text
If str.Contains(strfind) Then
Form1.TextBox1.SelectionStart = CStr(str.IndexOf(strfind))
Form1.TextBox1.SelectionLength = CStr(strfind.Length)
btnFindNext.Enabled = True
End If
End Sub
[.net] Can't do selectionstart from outside a form???
Author
Hi, I am adding a find feature to my notepad I coded in vb.net, but it won't let me do selectionstart and selectionlength from outside of the main form.
What's the exact error message?
I assume Form1 is the name of a Form based class and that TextBox1 is a private instance field of Form1. In this case:
1.) You cannot access instance members without an instance of the defining class. The btnFind_Click method needs to have access to an instance of Form1 somehow. For example you can pass the Form1 instance as a constructor argument to the class that defines btnFind_Click. Or you can define a property with a setter to accept the instance.
2.) You won't be able to access private members from outside the class. In your case, btnFind_Click will not have access to TextBox1 if btnFind_Click is not a member of Form1. You can provide a public property on Form1 that returns the TextBox instance.
3.) Generally it would be a better design if Form1 would not expose its controls. A better approach would be to have one property that returns the text in the text box and maybe have a method SelectText(start as Int32, length as Int32) that sets the selection for the text box.
Regards,
Andre
I assume Form1 is the name of a Form based class and that TextBox1 is a private instance field of Form1. In this case:
1.) You cannot access instance members without an instance of the defining class. The btnFind_Click method needs to have access to an instance of Form1 somehow. For example you can pass the Form1 instance as a constructor argument to the class that defines btnFind_Click. Or you can define a property with a setter to accept the instance.
2.) You won't be able to access private members from outside the class. In your case, btnFind_Click will not have access to TextBox1 if btnFind_Click is not a member of Form1. You can provide a public property on Form1 that returns the TextBox instance.
3.) Generally it would be a better design if Form1 would not expose its controls. A better approach would be to have one property that returns the text in the text box and maybe have a method SelectText(start as Int32, length as Int32) that sets the selection for the text box.
Regards,
Andre
Author
Hi,
btnFind_Click actually does have access to textbox1. I can edit and delete text from the find form. The problem is, I can't select text until the main form has focus again.
btnFind_Click actually does have access to textbox1. I can edit and delete text from the find form. The problem is, I can't select text until the main form has focus again.
Author
awesome, thanks. Now if I could only figure out how to make it scroll down to the selected text, I would be all set.
This topic is closed to new replies.
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