I am using a DevExpress XtraGrid/View for windows forms. The datasource of the grid is a binding source, which is connected to a dataset. My problem is, this table adapter does not update the datatable. I can insert new rows without problems, but I can't update. No error message is thrown; when I save changes, the row value just reverts. This happens for every column in the row. Here is my code for saving and then reloading data:
' Class variable
Private _invoiceDetailsAdapter As dsInvoiceDetailsTableAdapters.inv_InvoiceDetailsTableAdapter = New dsInvoiceDetailsTableAdapters.inv_InvoiceDetailsTableAdapter()
'Save Data
InvInvoiceLineBindingSource.EndEdit()
_invoiceDetailsAdapter.Update(DsInvoiceDetails.inv_InvoiceDetails)
'Load
DsInvoiceDetails.inv_InvoiceDetails.Clear()
If Me._invoiceId > 0 Then
_invoiceDetailsAdapter.Fill(DsInvoiceDetails.inv_InvoiceDetails, _invoiceId)
InvInvoiceLineBindingSource.Sort = "LineNum"
End If
I've figured out that it must be the dataset itself, because I've tried using a regular DataGridView with the dataset, to no avail. I generated the dataset through the wizard and had to add ColumnName and SourceColumn properties in the parameters for Insert & Update. The parameters for Insert & Update look identical as far as properties are concerned.
I've also tried creating new datasets, datatables, binding sources and tableadapters. I've even tried a DataAdapter but there was no difference. I have literally spent 2 weeks now looking through the properties and debugging, trying to find a cause.
Can someone please offer some advice?
The problem was DevExpress' XtraGrid functionality.
The XtraGrid does not immediately save an edit value to the linked dataset. The modified row is usually posted to the data object when focus is moved to another grid row. You can programmatically force the update by calling the UpdateCurrentRow method. In your case you should only call the CloseEditor and UpdateCurrentRow methods before updating the dataset via the DB adapter object.
So if a user only updates only one row, those changes go nowhere. Read on for a code snippet...
http://www.devexpress.com/Support/Center/Question/Details/A327
Related
I have a DataTable in my DataSet which is not bound to any table in the SQL Database since I need it only inside 2 forms. When I update it in Form1, it works just fine, the table is populated and I can see the data inside a DataGridView (here is the code I use for updating it):
Dim newProcesRow As DataRow = Me.SampleDataSet.Tables("TableSample").NewRow()
newProcesRow("Col1") = val1.ToString()
newProcesRow("Col2") = val2.ToString()
newProcesRow("Col3") = val3.ToString()
Me.Sample_DataSet.Tables("TableSample").Rows.Add(newProcesRow)
After doing this, the DataGridView in Form1 shows the entire table with no problems. After the user clicks a button, Form2 is shown, where there is a DataGridView as well with the same DataSource as the grid in the first form, the unbound table from the DataSet. I also tryed putting a MessageBox in Form2 to return the number of rows from the DataTable and the result was 0.
Is there any way I could make Form2 see the rows in the DataTable without binding it to the database? (I don't want to do unnecessary changes to the DataBase...) Or are there any saves/changes/updates I am not doing to the DataTable?
If there is anything else I should mention in order to make it easier to find a solution, tell me and I will add. Thanks in advance for any piece of advice, have a nice day! (:
What I am doing
I am developing a VisualBasic application where the GUI is separated from the data manipulation (frontend and backend). This particular piece of code keeps track of the Serial Numbers already measured and displays them in the Form as a DGV with the serial number and an image or not.
My code
In a class that the GUI Form instantiates, my data is stored in a DataTable with a BindingSource, with the second column displaying an Image when I tell it to in the program (Nothing in the beginning):
Public SerialNumbersBindingSource As New BindingSource
Public SerialNumbersDataTable As New DataTable
(...)
SerialNumbersBindingSource.DataSource = SerialNumbersDataTable
SerialNumbersDataTable.Columns.Add("Serial", Type.GetType("System.String"))
SerialNumbersDataTable.Columns.Add("Pass", MyImage.GetType)
In my GUI Form code, a DataGridView has its DataSource set to the former DataTable:
DataGridViewSerialNumber.DataSource = MyObject.SerialNumbersDataTable
By just updating the DataTable in my class, the DataGridView updates automatically to reflect the current state of it. I do it like:
SerialNumbersDataTable.Add(CurrentSerial, MyImage)
The results I get
The code works, so I can modify and access the DataTable and the DataGridView autoupdates. But the images are not stretching, so I can only see a small part of them.
What I need
I need the second column named "Pass" in DataGridView to stretch the images.
What have I tried
If I access the column, it is treated like a DGVColumn and not a DGVImageColumn, so the Layout operation fails.
DataGridViewSerialNumber.Columns("Pass").DataGridViewImageCellLayout.Stretch
Microsoft's Docs page tells me to do this, which treats the columns like DGVImageColumn as I need "Pass" to. It fails because the first column is a Text one, not image.
For Each column As DataGridViewImageColumn In DataGridViewSerialNumber.Columns("Pass")
column.ImageLayout = DataGridViewImageCellLayout.Stretch
Next
Also I have tried creating a local DGVImageColumn, modify it and write it onto the original column, but it is read-only.
Dim imageColumn As DataGridViewImageColumn
imageColumn = DataGridViewSerialNumber.Columns("Pass")
imageColumn.ImageLayout = DataGridViewImageCellLayout.Stretch
DataGridViewSerialNumber.Columns("Pass") = imageColumn
I have also tried to do it from the designer. If I click the DGV, arrow to the right and 'Edit Column', I can create the two columns and setup Pass as ImageColumn with Stretched Layout. But when I set up DGVSerialNumbers.Datasource to my DataTable, it adds the DataTable's columns to the DGV's.
Failed DGV with columns added in designer
It's time for you to learn how to cast. If you want to access one column then don't use a loop. Simply access the column you want and then cast it as the type you want to use it as. You also need to actually assign the appropriate value to the appropriate property.
DirectCast(DataGridViewSerialNumber.Columns("Pass"), DataGridViewImageColumn).ImageLayout = DataGridViewImageCellLayout.Stretch
If you want to break that up for clarity:
Dim imageColumn = DirectCast(DataGridViewSerialNumber.Columns("Pass"), DataGridViewImageColumn)
imageColumn.ImageLayout = DataGridViewImageCellLayout.Stretch
Also, be aware that Stretch will not retain the original aspect ratio, so you might want to use Zoom instead.
I have a program that is going to load data into a DataGridView, where users can edit/add/delete data. When they close out of the form, if there are any changes made, it will ask if the user wants to save the changes to the database.
So I have a DataTable that I load and assign to the DataSource of the DataGridView. I can then make changes to the data within the table, and if I call the DataSet.Update method, it updates.
However, if I call the DataTable.GetChanges method and look to see the changes, I get nothing, unless I have tabbed/clicked/whatever off of the current row of the DataGridView (in which case .GetChanges works) This leads me to believe that the changes are not committing to the DataTable unless the row loses focus.
So, is there a way to check to see if any cell is changed in a DataGridView, or a way to commit those changes without tabbing off of the row?
Again, this fails me if I don't change the row in the GridView, but works otherwise. I want it to work in both situations.
Dim changedRows As New DataTable()
changedRows = dtInfo.GetChanges(DataRowState.Modified Or DataRowState.Added Or DataRowState.Deleted)
If Not changedRows Is Nothing Then
....
End If
You can call the Form.ValidateChildren method, this will validate and commit all controls in the form, including your DataGridView. This method returns false if there is a validation error.
I made a windows form which contains a listbox (named VenueList). The listbox is pulling it's values from a list provided by a binding source VenuesBindingSource which is pulling in a ID for the value and a name for the text.
There is a button which is causing a DialogBox to appear which is asking for values to store in the database for a NEW venue. Once the values are filled and insert the database, what's supposed to happen is that the dialog box closes and goes back to the original form which invoked it.
However, instead of updating the list. The list stays the same. But if you close the form and reopen it, you see that a new value was added.
TournamentSettings.VenuesTableAdapter.InsertVenueQuery(Trim(VenueNameTxt.Text), Trim(VenueAddress1Txt.Text), Trim(VenueAddress2Txt.Text), Trim(VenueCityTxt.Text), Trim(VenueProvinceTxt.Text), Trim(VenueZipTxt.Text), Trim(CountryBox.SelectedValue), Trim(VenuePhoneNo.Text), VenueType.SelectedText, VenueWebAddress)
TournamentSettings.VenuesTableAdapter.Fill(TournamentSettings.VenueNameList.Venues)
In the above code, InsertVenueQuery is the name of a query from the designer which is invoked to add the values onto the tableadapter VenuesTableAdapter which is used to fill the combo box on load. I also sent the Fill command to refill the table with the new value.
So the question is, should I go about doing this another way, rather than feeding the Table adapter and sending a fill command on to the datatable? Or is there something that I'm not doing here which I should to force that value into the list. I'm tempted to redo everything outside of the designer but that's a lot of code since I have to essentially run two commands (one to insert the data, and another to get the ##IDENTITY value since this is run on an access database.)
Okay. This one I had to think about for a moment.
Instead of me creating a block of done on the load event, I instead created a sub function called "FillVenueList".
I used the following block of code:
Public Sub FillVenueList()
' Adding values from database to a datatable.
' From there will add to the list box.
Dim VenueConnection As New OleDb.OleDbConnection(DBconnection)
VenueConnection.Open()
Dim VenueConnectionQuery As New OleDb.OleDbCommand("SELECT VenueID, VenueName FROM Venues", VenueConnection)
Dim VenueDataAdapter As New OleDb.OleDbDataAdapter(VenueConnectionQuery)
Dim VenueDataSet As New DataSet
VenueDataAdapter.Fill(VenueDataSet, "Venues")
TrnVenueLst.DataSource = VenueDataSet.Tables("Venues")
TrnVenueLst.DisplayMember = "VenueName"
TrnVenueLst.ValueMember = "VenueID"
VenueConnection.Close()
End Sub
From there I called THIS sub on both the form AND the Add Venue window and I can safely see that this works. SO THAT is how you get a new value onto the form, don't use it as a part of the Load Event but rather call it from the load event block, then call it when you want to add to the list.
I have a simple VB.NET 2008 app that helps users to edit fields in the database. Simple enough as a first "real" project in .NET, right?
For one table, I am currently using a DataGridView so it can be edited straight up. However, instead of offering the user the entire table, I'd like to group the data by the 'CompanyNumber' column and use a navigator to page through. In other words, I'd like the DataGridView to show me all the lines related to one company, then click the "next" arrow to show the next company, etc.
(I know I could do this with Xceed DataGrid, but I'm using Windows Forms not WPF, and I'd really prefer to do this with "pure" ADO.NET for this project.)
Update 2009-09-28:
So I have created a ComboBox filled from the same BindingSource, and configured its SelectedIndexChanged to change the Filter value on the DataGridView.
But still, filling the ComboBox--which should be easy!--continues to be a problem. I can either:
(a) fill it from the BindingSource, in which case I see multiples of each 'CompanyNumber' and I can't figure out a way to show only distinct values, or
(b) create another TableAdapter in the data source which is just a "Select DISTINCT CompanyNumber..." query, which mostly works, except that that first value of the list changes when I change the selection (e.g. if the ComboBox shows "100, 101, 102, 103" and I pick "102", then the list will show as "102, 101, 102, 103").
Any recommendations?
(Also, bonus if you can suggest how to make the BindingNavigator's arrows page through the 'CompanyNumber' filters instead of the items in the DataGridView... which is what I'd really like to see.)
What you could do is just force the DataGridView to sort CompanyName, this way all rows with the same company name are next to each other and the user can navigate the data grids with the paging that comes with it.
Alternatly, you could follow through with your combobox/DropDownList idea, which would be best. From what I understand when you select an item in the combobox everything in it changes?
Another way is to create two separate buttons, "Previous" "Next", that when clicked, will change the DataGridView's binding source to only show a certain company. You would need to store an array of company names, then store what the current DataGridView's binding source is displaying.
I ended up figuring it out myself, and the solution is clean and simple. Here are the basic steps:
create a DataView off of the table out of the DataSet
use the DataView.ToTable() method to create a new table filtered to only distinct values from the needed column ('CompanyNumber')
create a BindingSource which uses the new DataTable as its DataSource
bind the ComboBox to the new BindingSource
bind the BindingNavigator to the new BindingSource
Because the ComboBox and the BindingNavigator use the same BindingSource, they will update each other with the changes automagically.
Here's the rough code:
Private Sub CoNumsComboxBox_LoadData()
Dim dvCoNums As DataView, dtCoNums As DataTable
dvCoNums = New DataView(Me.ODBCDataSet.Tables("CompanyFundProfile"))
dvCoNums.Sort = "CompanyNumber ASC, FundNumber ASC"
dtCoNums = dvCoNums.ToTable("CompanyFundProfile", True, "CompanyNumber")
CoNums_BindingSource.DataSource = dtCoNums
CoNumsComboBox.DataSource = CoNums_BindingSource
CoNumsComboBox.DisplayMember = "CompanyNumber"
CoNumsComboBox.ValueMember = "CompanyNumber"
'attach handler which changes DataGridView1's filter when this changes
AddHandler ToolStripComboBox1.SelectedIndexChanged, AddressOf CoNumsComboBox_SelectedIndexChanged
CompanyFundProfile_BindingNavigator.BindingSource = CoNums_BindingSource
End Sub