I would need a little help.
Textbox1.Text contains 1,2,3,4,5,6,17.
Data in Textbox2:
Lines 0 = 1,2,3,4,5,7,18
Lines 1 = 21,2,3,4,5,7,19
Lines 2 = 13,11,3,4,5,7,19
Lines 3 = 1,2,3,4,5,6,17
Lines 4 = 1,2,3,4,5,6,21
How can I do?
For Each lines In Textbox2.Lines
Next
Expected Output: Textbox3.Text contains 3 (Because the combination from Textbox1 is found on the line 3 in the data).
Don't use for each.
You should iterate over your lines with an index and return the index.
Code exmaple:
For index As Integer = 0 To TextboxX.Lines.Length Step 1
' Here you can use your logic to check if the current line (by the index) is correct using TextboxX.Lines(index).
' Something like TextboxX.Lines(index) = Textbox1.text
If TextboxX.Lines(index) = Textbox1.Text Then
Textbox3.Text = index
Exit For
End If
Next
Bonus
This logic is already implemented in the framework, and it looks better like this:
Textbox3.Text = Array.IndexOf(TextboxX.Lines, Textbox1.Text)
Note - if the value was not found Array.IndexOf will return -1
Related
I am trying to make all possible combination of a string except the regular ones,
For exemple if i put on a TextBox ABCDEFGH i don't need AAAAAAAAAA or BBBBBBBB or ABABABAB or ABCDABCD and so on...
I need all possible combination but only randomly ones not symetric ones, for exemple: BCGHDAAC or ACEEFAGH... etc
Is there a way to do that? Because i really don't know how to do it
I tried this one but it's not giving me all results
Dim i As Integer = 0
Do Until i = TextBox1.Text.Length
RichTextBox1.Text = RichTextBox1.Text & TextBox1.Text.Substring(i, +1)
i = i + 1
Loop
i = TextBox1.Text.Length
Do Until i = 0
RichTextBox1.Text = RichTextBox1.Text & TextBox1.Text.Substring(i, +1)
i = i - 1
Loop
Thank you for help
I am trying to delete empty lines from a textfile using vb.net. This is an example of what I have tried so far however it is not working as expected:
Dim i As Integer = 0
Dim CountDeleted = 0
Dim TextString As String
For Each Line As String In lines
TextString = lines(i)
If TextString.Trim = "" Then
lines.RemoveAt(i)
CountDeleted += 1
End If
i += 1
Next Line
This is an example of the data within a textfile that I would like to remove the lines from:
BUSINESS_UNIT|PO_ID|LINE_NBR|CANCEL_STATUS|
A
B
C
Required output:
BUSINESS_UNIT|PO_ID|LINE_NBR|CANCEL_STATUS|
A
B
C
Any help would be much appreciated
To remove all the blank lines is just one line of code with linq
Dim nonBlank = lines.Where(Function(x) Not String.IsNullOrWhiteSpace(x))
Counting the removed is just a difference between elements in the two lists
Dim CountDeleted = lines.Count - nonBlank.Count
Your code will trigger a runtime exception because you are removing an item from the same collection that you enumerate with the For Each loop.
You could switch to an old fashioned For Next loop but be careful to start from the end of the collection and examine the strings toward the beginning of the collection.
For i = lines.Count - 1 To 0 Step - 1
TextString = lines(i)
If string.IsNullOrWhiteSpace() Then
lines.RemoveAt(i)
CountDeleted += 1
End If
Next
This backward loop is required because when you remove an item from the collection the total items count decrease and the items following the current index will slide one position. A normal (forward) loop will skip to examine the item following the one deleted.
To remove all WhiteSpace strings from List(Of String):
lines.RemoveAll(addressOf String.IsNullOrWhiteSpace)
To remove all WhiteSpace lines from a text file:
File.WriteAllText(path, Regex.Replace(File.ReadAllText(path), "(?m)^\s+^", ""))
Basically, how do I write a new line in a text box, keeping the existing information as well.
If I have for loop,
For i As Integer = 1 To 10
Dim result = i
i = i + 1
textbox1.text = result
Next
This will display '10' in the textbox. I want it to be like:
1
2
3
4
...
First, your TextBox must allow multiple lines. This is a property of the textbox control that you can set from the designer or from the code. You may want to ensure that a scroll bar is there to scroll in case the height is not large enough.
If you want to set the properties from code, use this code in the Load event of the form.
' Set the Multiline property to true.
textBox1.Multiline = True
' Add vertical scroll bars to the TextBox control.
textBox1.ScrollBars = ScrollBars.Vertical
' Change the height of the textbox so that it could accomodate the lines
TextBox1.Height = 120
Now, your approach had a major problem in this line:
textbox1.text = result
The way you coded it, every new value of i, would overwrite the old value. What you want to do is to first construct a string, then send the entire string to the TextBox control. This is not required had you been using Console.WriteLine method.
Method 1
Dim s as string
s=""
For i As Integer = 1 To 10
s = s & Environment.Newline & i.ToString() 'we use Environment.NewLine to force new line
Next i
textbox1.text = s
Method 2
.NET offers a class to handle strings better than the way we did before. It won't matter in your case but it is the efficient way to handle concatenation when volume is large and/or performance matters
Dim s as new System.Text.StringBuilder() 'Initialize stringbuilder instance
For i As Integer = 1 To 10
s.AppendLine (i.ToString()) 'We use stringbuilder to concat. and inser line feed
Next i
textbox1.text = s.ToString()
Note: If you want double spacing then you need to add a linefeed (using & ) to both of the above methods.
Something like this should work:
For i As Integer = 1 To 10
if i = 1 then
textbox1.text = i
else
textbox1.text &= vbcrlf & i
end if
Next
For i = 1 To 10
textbox1.AppendText(vbNewLine & i)
Next
I am trying to parse junk and narrow down a bunch of text. How do I delete the current line if a does not match? I would like to remove the line entirely:
For i As Integer = 0 To RichTextBox1.Lines.Length - 1
Dim a As String = RichTextBox1.Lines(i).ToString
If Not a = "SaveThisLine" Then
'delete the active line
End If
Next
Also how would I match partially? Such as if not a = "SaveThisLine" & * (to use a wildcard).
I would not touch original text and rather save valid lines into a StringBuilder, so if line is valid, AppendLine to it. In the end dump back into RichTextBox1.Text using StringBuilder.ToString.
For partial match in VB.NET you can use a native Like operator:
"aaa" Like "a*"
Returns True.
Or use regular expressions:
System.Text.RegularExpressions.Regex.Match("aaa", "^a").Success
Also returns True.
You can do it in this way to:
For i As Integer = 0 To RichTextBox1.Lines.Length - 1
If RichTextBox1.Lines(i) = "2" Then
RichTextBox1.Text = Replace(RichTextBox1.Text, RichTextBox1.Lines(i), "", , 1)
End If
Next
I have some coding which displays a label if the value of a textbox matches any of the first values of each line in a textfile.
Dim sList As New List(Of String)(IO.File.ReadAllLines("Path"))
Dim i As Integer
For i = 0 To sList.Count - 1
If sList(i).StartsWith(textbox1.Text) Then
Label1.Visible = True
Exit For
Else
Label1.Visible = False
End If
Next
The problem is if the textbox has 1 and the textfile has 11 it will display the label, what would be the best way around this?
I have tried sList(i).Contains etc but none of them are doing the job.
I have tried all the suggestions here and nothing works, my textfile has numbers like the following
11
15
18
and for example if i have the number 1 in the textbox then the label is visible.
Try this:
Label1.Visible = IO.File.ReadAllLines("Path.txt").Any(Function(f) f = TextBox1.Text)
I think LINQ can be used here:
Dim text = textbox1.Text
Dim textWithSpace = String.Format("{0} ", text)
Label1.Visible = IO.File.ReadAllLines("Path").Any(Function(line) line.StartsWith(textWithSpace) OrElse line = text)
You need import System.Linq to make it work.
I assumed that space ends each word in the file.
If you want the Label to be visible when at least one of the lines starts with the text in the TextBox, you can use LINQ and Enumerable.Any:
Dim matchingLines = From l In IO.File.ReadLines("Path")
Where l.StartsWith(textbox1.Text)
Label1.Visible = matchingLines.Any()
Try changing the following line, assuming you are reading from a text file and looking for an exact match of the whole line you could try this:
If sList(i).StartsWith(textbox1.Text + Environment.NewLine) Then
That should check to make sure its the only thing on that line as it is now looking for a new line and will not match '11'