I load a datagridview and am trying to find a quick way of looping through a certain column, given column name....
This is how my datagridview is loaded....
ad = New SqlDataAdapter(sql, con)
ad.Fill(ds, "Fields")
dgvFields.DataSource = ds.Tables("Fields")
dgvFields.ReadOnly = True
dgvFields.RowHeadersVisible = False
dgvFields.Columns(0).Width = 156
dgvFields.Columns(1).Width = 156
dgvFields.Columns(2).Width = 156
dgvFields.Columns(3).Width = 157
'Now I want to be able to loop through dgvfields.columns(3) or column name "Field1a" and check if dgvfields.rows="ValueA"
something along the lines...
For Each row As DataRow In dgvFields.Columns(5)
if dgvfields.rows.value="ValueA" then
'do something
End if
Next
The issue is the type you are looking at for your row... DataRow is for a DataTable not a DataGridViewRow... I would recommend using the index...
Note: this can be done many way's.
For i As Integer = 0 To dgvFields.Rows.Count - 1
If dgvfields.Rows(i).Cells("THE COLUMN NAME").Value="ValueA" Then
'do something
End if
Next
Related
This is my code
Public Sub InvoicItmCall()
'If IteDataTb.Rows.Count = 0 Then Exit Sub
SellingDGView.Rows.Add()
SellingDGView.Rows.Item(0).Cells(0).Value = SellingDGView.Rows.Item(0).Cells(0).Value + 1
SellingDGView.Rows.Item(0).Cells(1).Value = IteDataTb.Rows(0).Item("IteFName")
SellingDGView.Rows.Item(0).Cells(2).Value = IteDataTb.Rows(0).Item("IteFSizeUnit")
SellingDGView.Rows.Item(0).Cells(4).Value = IteDataTb.Rows(0).Item("IteFSellpris")
SellingDGView.Rows.Item(0).Cells(6).Value = IteDataTb.Rows(0).Item("IteVat")
'Dim unused = SellingDGView.Rows.Add(rows)
End Sub
Right now, the code works fine and fills the first row on the grid, this is for a barcode scanner. When I scan one barcode, it fills the row with the appropriate data. However, when I scan another code, it overwrites the older row.
I want it to add a new row and add the other data to it.
So when I scan a different item after the first one, it should fill up a new row.
How do I do that?
Thanks in advance :)
EDIT:
I have found a workaround
If IteDataTb.Rows.Count > 0 Then
For Each row As DataRow In IteDataTb.Rows
SellingDGView.Rows.Add(row.Item("IteFName"), row.Item("IteFSizeUnit"), row.Item("IteFSellpris"), row.Item("IteVat"))
Next row
End If
This creates a new row every time and fills it. But now I want to fill specific cells.
How do I do that?
Right now it fills everything inappropriately.
If you wanted to do it the way you originally were, I'd do it like this:
Dim index = SellingDGView.Rows.Add()
Dim newRow = SellingDGView.Rows(index)
'Dim newRow = SellingDGView.Rows(SellingDGView.Rows.Add())
Dim dataRow = IteDataTb.Rows(0)
newRow.Cells(0).Value = SellingDGView.Rows(0).Cells(0).Value + 1
newRow.Cells(1).Value = dataRow("IteFName")
newRow.Cells(2).Value = dataRow("IteFSizeUnit")
newRow.Cells(4).Value = dataRow("IteFSellpris")
newRow.Cells(6).Value = dataRow("IteVat")
If you wanted to use the more appropriate overload of Add that I mentioned and you used in your second example:
For Each row As DataRow In IteDataTb.Rows
SellingDGView.Rows.Add(SellingDGView.Rows(0).Cells(0).Value + 1,
row("IteFName"),
row("IteFSizeUnit"),
Nothing,
row("IteFSellpris"),
Nothing,
row("IteVat"))
Next
The If statement is pointless.
Also, I doubt that you're getting the next ID in the best way with that expression that adds 1 but that's a different question.
Every time that you need a new row, you can do as follows:
Dim i As Integer = SellingDGView.Rows.Add()
SellingDGView.Rows.Item(i).Cells(0).Value = i
SellingDGView.Rows.Item(i).Cells(1).Value = IteDataTb.Rows(j).Item("IteFName")
SellingDGView.Rows.Item(i).Cells(2).Value = IteDataTb.Rows(j).Item("IteFSizeUnit")
SellingDGView.Rows.Item(i).Cells(4).Value = IteDataTb.Rows(j).Item("IteFSellpris")
SellingDGView.Rows.Item(i).Cells(6).Value = IteDataTb.Rows(j).Item("IteVat")
Herein, I've assumed that the variable "j" indicates to your desired row in IteDataTb datagridview. I mean that you should control the "j" variable yourself. I can help you if know more about the IteDataTb.
I have a Part class with the fields list in the code below. I have a DataGridView control, which I am filtering with the Advanced DGV (ADGV) DLL from NUGET. I must include the ADGV in my winform. I currently have a DataGridView, a search box on the form, and a button to run the following function. I need to go through all of the visible rows, collect a unique list of part numbers with their most recent revisions, and then color the rows in DataGridView which are out of date by checking the part number and rev on each row against the mostuptodate list. For 45,000 entries displayed in DataGridView, this take ~17 secs. For ~50 entries, it take ~1.2 seconds. This is extremely inefficient, but I can't see a way to cut the time down.
Sub highlightOutdatedParts()
'Purpose: use the results in the datagridview control, find the most recent revision of each part, and
' highlight all outdated parts relative to their respective most recent revisions
'SORT BY PART NUMBER AND THEN BY REV
If resultsGrid.ColumnCount = 0 Or resultsGrid.RowCount = 0 Then Exit Sub
Dim stopwatch As New Stopwatch
stopwatch.Start()
resultsGrid.Sort(resultsGrid.Columns("PartNumber"), ListSortDirection.Ascending)
Dim iBag As New ConcurrentBag(Of Part)
Dim sortedList As Generic.List(Of Part)
For Each row As DataGridViewRow In resultsGrid.Rows
If row.Visible = True Then
Dim iPart As New Part()
Try
iPart.Row = row.Cells(0).Value
iPart.Workbook = CStr(row.Cells(1).Value)
iPart.Worksheet = CStr(row.Cells(2).Value)
iPart.Product = CStr(row.Cells(3).Value)
iPart.PartNumber = CStr(row.Cells(4).Value)
iPart.ItemNo = CStr(row.Cells(5).Value)
iPart.Rev = CStr(row.Cells(6).Value)
iPart.Description = CStr(row.Cells(7).Value)
iPart.Units = CStr(row.Cells(8).Value)
iPart.Type = CStr(row.Cells(9).Value)
iPart.PurchCtgy = CStr(row.Cells(10).Value)
iPart.Qty = CDbl(row.Cells(11).Value)
iPart.TtlPerProd = CDbl(row.Cells(12).Value)
iPart.Hierarchy = CStr(row.Cells(13).Value)
iBag.Add(iPart)
Catch ice As InvalidCastException
Catch nre As NullReferenceException
End Try
End If
Next
sortedList = (From c In iBag Order By c.PartNumber, c.Rev).ToList() ' sort and convert to list
Dim mostUTDRevList As New Generic.List(Of Part) ' list of most up to date parts, by Rev letter
For sl As Integer = sortedList.Count - 1 To 0 Step -1 'start at end of list and work to beginning
Dim query = From entry In mostUTDRevList ' check if part number already exists in most up to date list
Where entry.PartNumber = sortedList(sl).PartNumber
Select entry
If query.Count = 0 Then ' if this part does not already exist in the list, add.
mostUTDRevList.Add(sortedList(sl))
End If
Next
'HIGHLIGHT DATAGRIDVIEW ROWS WHERE PART NUMBERS ARE OUT OF DATE
For Each row As DataGridViewRow In resultsGrid.Rows
' if that part with that Rev does not exist in the list, it must be out of date
Try
Dim rowPN As String = CStr(row.Cells(4).Value).ToUpper ' get part number
Dim rowR As String = CStr(row.Cells(6).Value).ToUpper ' get Rev
Dim query = From entry In mostUTDRevList ' check if that part number with that Rev is in the list.
Where entry.PartNumber.ToUpper.Equals(rowPN) AndAlso
entry.Rev.ToUpper.Equals(rowR)
Select entry
If query.Count = 0 Then ' if the part is out of date highlight its' row
row.DefaultCellStyle.BackColor = Color.Chocolate
End If
Catch ex As NullReferenceException
Catch ice As InvalidCastException
End Try
Next
resultsGrid.Select()
stopwatch.Stop()
If Not BackgroundWorker1.IsBusy() Then timertextbox.Text = stopwatch.Elapsed.TotalSeconds.ToString & " secs"
MessageBox.Show("Highlighting completed successfully.")
End Sub
It is almost always faster to work with the data than the control. The control is simply the means to present a view of the data (in a grid) to the users. Working with the data from there requires too much converting to be effieicent. Then, use the DGV events to highlight the rows
Its hard to tell all the details of what you are doing, but it looks like you are comparing the data to itself (as opposed to some concrete table where the lastest revision codes are defined). Nor is it clear why the datasources are collections, ConcurrentBags etc. The key would be to use collections optimized for the job.
To demonstrate, I have a table with 75,000 rows; the product codes are randomly selected from a pool of 25,000 and a revision code is a random integer (1-9). After the DGV datasource is built (a DataTable) a LookUp is created from the ProductCode-Revision pair. This is done once and once only:
' form level declaration
Private PRCodes As ILookup(Of String, Int32)
' go thru table
' group by the product code
' create an anon Name-Value object for each,
' storing the code and highest rev number
' convert result to a LookUp
PRCodes = dtSample.AsEnumerable.
GroupBy(Function(g) g.Item("ProductCode"),
Function(key, values) New With {.Name = key.ToString(), .Value = values.
Max(Of Int32)(Function(j) j.Field(Of Int32)("RevCode"))
}).
ToLookup(Of String, Int32)(Function(k) k.Name, Function(v) v.Value)
Elapsed time via stopwatch: 81 milliseconds to create the collection of 23731 items. The code uses an anonymous type to store a Max Revision code for each product code. A concrete class could also be used. If you're worried about mixed casing, use .ToLowerInvariant() when creating the LookUp (not ToUpper -- see What's Wrong With Turkey?) and again later when looking up the max rev.
Then rather than looping thru the DGV rows use the RowPrePaint event:
If e.RowIndex = -1 Then Return
If dgv1.Rows(e.RowIndex).IsNewRow Then Return
' .ToLowerInvariant() if the casing can vary row to row
Dim pc = dgv1.Rows(e.RowIndex).Cells("ProductCode").Value.ToString()
Dim rv = Convert.ToInt32(dgv1.Rows(e.RowIndex).Cells("RevCode").Value)
Dim item = PRCodes(pc)(0)
If item > rv Then
dgv1.Rows(e.RowIndex).DefaultCellStyle.BackColor = Color.MistyRose
End If
Notes
It takes some time to create the DataSource, but 75,000 rows is a lot to throw at a user
The time to create the LookUp is minimal - barely measurable
There is no noticeable wait in displaying them because a) the LookUp is made for this sort of thing, b) rows are done as needed when they are displayed. Row # 19,999 may never be processed if the user never scrolls that far.
This is all geared to just color a row. If you needed to save the Current/NotCurrent state for each row, add a Boolean column to the DataTable and loop on that. The column can be invisible if to hide it from the user.
The random data results in 47,000 out of date RevCodes. Processing 75k rows in the DataTable to set the flag takes 591 milliseconds. You would want to do this before you set the DataTable as the DataSource to prevent changes to the data resulting in various events in the control.
In general, the time to harvest the max RevCode flag and even tag the out of date rows is a trivial increment to creating the datasource.
The Result:
The data view is sorted by ProductCode so that the coloring of lower RevCodes is apparent.
We surely cant grok all the details and constraints of the system from a small snippet - even the data types and original datasource are a guess for us. However, this should provide some help with better look-up methods, and the concept of working with the data rather than the user's view.
One thing is the revision code - yours is treating them as a string. If this is alphanumeric, it may well not compare correctly - "9" sorts/compares higher than "834" or "1JW".
See also:
Lookup(Of TKey, TElement) Class
Anonymous Types
The solution was spurred in part by #Plutonix.
Sub highlightOutdatedParts()
If resultsGrid.ColumnCount = 0 Or resultsGrid.RowCount = 0 Then Exit Sub
Dim stopwatch As New Stopwatch
stopwatch.Start()
resultsGrid.DataSource.DefaultView.Sort = "PartNumber ASC, Rev DESC"
resultsGrid.Update()
'HIGHLIGHT DATAGRIDVIEW ROWS WHERE PART NUMBERS ARE OUT OF DATE
Dim irow As Long = 0
Do While irow <= resultsGrid.RowCount - 2
' if that part with that Rev does not exist in the list, it must be out of date
Dim utdPN As String = resultsGrid.Rows(irow).Cells(4).Value.ToString().ToUpper()
Dim utdRev As String = resultsGrid.Rows(irow).Cells(6).Value.ToString().ToUpper()
Dim iirow As Long = irow + 1
'If iirow > resultsGrid.RowCount - 1 Then Exit Do
Dim activePN As String = Nothing
Dim activeRev As String = Nothing
Try
activePN = resultsGrid.Rows(iirow).Cells(4).Value.ToString().ToUpper()
activeRev = resultsGrid.Rows(iirow).Cells(6).Value.ToString().ToUpper()
Catch ex As NullReferenceException
End Try
Do While activePN = utdPN
If iirow > resultsGrid.RowCount - 1 Then Exit Do
If activeRev <> utdRev Then
resultsGrid.Rows(iirow).DefaultCellStyle.BackColor = Color.Chocolate
End If
iirow += 1
Try
activePN = resultsGrid.Rows(iirow).Cells(4).Value.ToString().ToUpper()
activeRev = resultsGrid.Rows(iirow).Cells(6).Value.ToString().ToUpper()
Catch nre As NullReferenceException
Catch aoore As ArgumentOutOfRangeException
End Try
Loop
irow = iirow
Loop
resultsGrid.Select()
stopwatch.Stop()
If Not BackgroundWorker1.IsBusy() Then
timertextbox.Text = stopwatch.Elapsed.TotalSeconds.ToString & " secs"
resultcounttextbox.Text = resultsGrid.RowCount - 1 & " results"
End If
MessageBox.Show("Highlighting completed successfully.")
End Sub
In my VB.Net application I am filling my data grid view like this:
Dim cmdd1 As New SqlCommand("DashBordFetch1", con.connect)
cmdd1.CommandType = CommandType.StoredProcedure
cmdd1.Parameters.Add("#locid", SqlDbType.Int).Value = locid
da1.SelectCommand = cmdd1 dr = cmdd1.ExecuteReader
While dr.Read
flag = False
carid1 = dr("Car_Id")
For j = 0 To dcnt1 - 2
If carid1 = dgv.Item(0, j).Value Then
flag = True
Exit For
End If
Next
If flag = False Then
If dr("Car_Id") Is DBNull.Value Then
carid1 = "null"
Else
carid1 = dr("Car_Id")
End If
If dr("Plate_Source") Is DBNull.Value Then
platesource1 = "Null"
Else
platesource1 = dr("Plate_Source")
End If
Dim row1 As String() = {carid1, platesource1}
DGVDeliverd.Rows.Add(row1)
End If
End While
..also i am using Timer..every 2 minutes timer will work .some time new records will added to my datagridview..while adding new record that is adding to last row of my datagrid view,,i want to add every time new records to my first row of datagridview. how i can do this?
I am using windows forms
You can use Insert instead of Add to specify the position for the new row. So always insert at position zero:
DGVDeliverd.Rows.Insert(0, row1)
See MSDN here for details (screenshot below).
Use:
Order by your primary id desc
to keep the latest data on top of the grid
update #1
DGVDeliverd.Controls[0].Controls.AddAt(0, row1);
hi this is my code to get datable from query but i need to check for some values like if there is 0 in any column then replace it with N.A.
Dim op As New cad
Dim dt As DataTable = op.Fetchbooks().Tables(0)
Dim sb As New StringBuilder()
Dim rp As System.Data.DataRow
If dt.Rows.Count > 0 Then
ListView1.DataSource = dt
ListView1.DataBind()
DropDownList1.DataSource = dt
DropDownList1.DataTextField = "Description"
DropDownList1.DataValueField = "Description"
DropDownList1.DataBind()
End if
so is there any way to check some values and edit in datable before binding ???
First, if possible i would modify your sql-query in Fetchbooks instead to replace 0 with N.A.. I assume you are querying the database.
However, if you want to do it in memory:
For Each row As DataRow In dt.Rows
For Each col As DataColumn In dt.Columns
If row.IsNull(col) OrElse row(col).ToString = "0" Then
row(col) = "N.A."
End If
Next
Next
Sure: you can iterate through the table, making whatever value replacements are appropriate (assuming that your replacement values are type-compatible with what came from the query).
Something like:
For Each row as DataRow in dt.Rows
if row("columnname") = "left" then
row("columnname") = "right"
Next
Then bind it to the grid, and you should see your updated values.
Once you have the DataTable object you can manipulate it as you need:
For Each rp In dt.Select("COLUMN_A = '0'")
rp("COLUMN_A") = "N.A."
Next
Note that this assumes that COLUMN_A is defined as a string type, not a numeric.
The challenge will be if you intend on saving this data back to it's source and you don't want the original 0 value to be saved instead of N.A.. You could add dt.AcceptChanges immediately after the above loop so that it will appear as the Fetchbooks query had these values all along.
I have a table named users which has the following columns in it
User_id,user_name,user_pwd,First_Name,Middle_Name,Last_Name and user_type.
I have dataset named dst and created a table called user in the dataset. Now I want to populate listbox with user_Name, First_Name, Last_name of each and every row in the table user.
I am able to add one column value at a time but not getting how to add multiple column values of each row to listbox
Dim dt As DataTable = Dst.Tables("user")
For Each row As DataRow In dt.Rows
lstUsers.Items.Add(row("User_Name"))
Next
Above code works perfectly but I also want to add First_name as well as last_name to the list box at the same time.
Use same approach as you have, but put all values you want in one string.
Dim dt As DataTable = Dst.Tables("user")
For Each row As DataRow In dt.Rows
Dim sItemTemp as String
sItemTemp = String.Format("{0},{1},{2}", row("User_Name"), row("First_Name"), row("Last_Name"))
lstUsers.Items.Add(sItemTemp)
Next
String.Format() function will call .ToString() on all parameters.
In this case if row(ColumnName) is NULL value then .ToString() return just empty string
You have 2 choices:
Using the ListBox:
To use the ListBox, set the font to one that is fixed width like courier new (so that the columns line up), and add the items like this:
For Each row As DataRow In dt.Rows
lstUsers.Items.Add(RPAD(row("User_Name"),16) & RPAD(row("First_Name"),16) & RPAD(row("Last_Name"),16))
Next
The RPAD function is defined like this:
Function RPAD(a As Object, LENGTH As Object) As String
Dim X As Object
X = Len(a)
If (X >= LENGTH) Then
RPAD = a : Exit Function
End If
RPAD = a & Space(LENGTH - X)
End Function
Adjust the LENGTH argument as desired in your case. Add one more for at least one space. This solution is less than ideal because you have to hard-code the column widths.
Use a DataGridView control instead of a ListBox. This is really the best option, and if you need, you can even have it behave like a ListBox by setting the option to select the full row and setting CellBorderStyle to SingleHorizontal. Define the columns in the designer, but no need to set the widths - the columns can auto-size, and I set that option in the code below. if you still prefer to set the widths, comment out the AutoSizeColumnsMode line.
The code to set up the grid and add the rows goes like this:
g.Rows.Clear() ' some of the below options are also cleared, so we set them again
g.AutoSizeColumnsMode = DataGridViewAutoSizeColumnMode.AllCells
g.CellBorderStyle = DataGridViewCellBorderStyle.SingleHorizontal
g.SelectionMode = DataGridViewSelectionMode.FullRowSelect
g.AllowUserToAddRows = False
g.AllowUserToDeleteRows = False
g.AllowUserToOrderColumns = True
For Each row As DataRow In dt.Rows
g.Rows.Add(row("User_Name"), row("First_Name"), row("Last_Name"))
Next
You might solved your problem by now but other users like me might have issue with it.
Above answers given worked for me even but I found a same answer in a simple way according to what I want..
cmd = New SqlCommand("select User_Name, First_Name, Last_Name from User")
Dim dr As SqlDataReader = cmd.ExecuteReader(YourConnectionString)
If dr.HasRows Then
Do While dr.Read
lst.Items.Add(dr.Item(0).ToString & " " & dr.Item(1).ToString & " " & dr.Item(2).ToString)
Loop
End If
This worked for me, maybe wrong way but I found it simple :)
May I suggest you use a ListView control instead of Listbox?
If you make the switch, here's a sample subroutine you could use to fill it up with the data you said you want. Adapt it the way you like; there's much room for improvement but you get the general idea:
Public Sub FillUserListView(lstUsers As ListView, Dst As DataSet)
Dim columnsWanted As List(Of String) = New List(Of String)({"User_Name", "First_Name", "Last_Name"})
Dim dt As DataTable = Dst.Tables("user")
Dim columns As Integer = 0
Dim totalColumns = 0
Dim rows As Integer = dt.Rows.Count
'Set the column titles
For Each column As DataColumn In dt.Columns
If columnsWanted.Contains(column.ColumnName) Then
lstUsers.Columns.Add(column.ColumnName)
columns = columns + 1
End If
totalColumns = totalColumns + 1
Next
Dim rowObjects(columns - 1) As ListViewItem
Dim actualColumn As Integer = 0
'Load up the rows of actual data into the ListView
For row = 0 To rows - 1
For column = 0 To totalColumns - 1
If columnsWanted.Contains(dt.Columns(column).ColumnName) Then
If actualColumn = 0 Then
rowObjects(row) = New ListViewItem()
rowObjects(row).SubItems(actualColumn).Text = dt.Rows(row).Item(actualColumn)
Else
rowObjects(row).SubItems.Add(dt.Rows(row).Item(actualColumn))
End If
lstUsers.Columns.Item(actualColumn).Width = -2 'Set auto-width
actualColumn = actualColumn + 1
End If
Next
lstUsers.Items.Add(rowObjects(row))
Next
lstUsers.View = View.Details 'Causes each item to appear on a separate line arranged in columns
End Sub