Binding A Datagridview To A Collection?
Apr 4, 2011
I've bound a collection with public properties that are of type double to a datagridview control. If, in the datagrid, the user enters a value that is a string I get an error thrown, and I can't seem to find the method to handle it.
The only way I've been able to fix this is to make all public items in my bound collection of type string, and in the get/set make the private variables double.
This is a huge pain; is there any way to do this in a more elegant fashion?
2nd question is there a way to make the default header text something other than the public property name? (I know I can manually change this in the code later, I was wondering if there was a way to automatically have it something else)
(below is example code; I've changed the P property to reflect that change I had to make)
Public Class clsPIDElement
Private _P As Double
Private _I As Double
[Code]...
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Jan 24, 2012
I have a GUI which allows the user to select a report to view/edit. When the user selects a report, it shows the Items in the report. The Item has many properties - most of which are binding properly. One of the properties is Owner, and this is bound to a ComboBoxColumn.
Report
Items
Owner
I have done something very similar to this a few times and had no problems when I set the DataPropertyName, DataSource, ValueMember, and DisplayMember. The only difference is that this time instead of the Item type having an OwnderID it actually has an instance of the Owner object.giving the items bound in the list a self-referencing property that allows them to return themselves for the purposes of setting the ValueMember.However, When I bind it this way:
OwnerColumn.DataPropertyName = "Owner"
OwnerColumn.DataSource = ownersBindingSource1
OwnerColumn.ValueMember = "Self"
OwnerColumn.DisplayMember = "OwnerName"
I get a lot of errors like: Unable to cast object of type 'System.String' to type 'Owner'.
and:
The following exception occurred in the DataGridView:
System.ArgumentException: DataGridViewComboBoxCell value is not valid.To replace this default dialog please handle the DataError event.I was able to get around some of these errors by binding it like this:
OwnerColumn.DataPropertyName = "Owner"
OwnerColumn.DataSource = ownersBindingSource1
and also by making the ToString function on the Owner display the OwnerName property. This seems pretty hacky though - and I think I'm misunderstanding something fundamental as it still does not function properly.
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Jul 2, 2011
Binding Master Table to TextBox and DateTimePicker and Binding Details Tables to Datagridview then Add / Update / Delete in both
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Mar 16, 2012
I was wondering if its possible to bind a datagrid column to a list (Of T) thats stored within an observable collection!
Here's my current code:
Dim _BindWithThis As New List(Of BindWithThis)
Me.DataContext = _BindWithThis
For i = 0 To 3
[Code]....
This currently displays four rows of "(Collection)". Is it possible to step into one of these "Collection" rows and display the data? I know that this is possible to do with a list box by binding with a specific element in the collection:
ListBox1.ItemsSource = _BindWithThis.Item(0).DataValue
I just can't work out how to do this with a datagrid...
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Apr 15, 2010
I'm trying to create a collection of variable binding in a class.It is intended to look something like this:
Dim x as integer, s as string
Dim c as new VBindClass
x = 1
s = "Hello"
[code]....
Is there some function that allow us to retrieve a unique ID for a given variable and also get/set based on variable?
Update:At last, I've managed to found the answer. Here's the code:
Dim gh As Runtime.InteropServices.GCHandle = Runtime.InteropServices.GCHandle.Alloc(obj)
Return Runtime.InteropServices.GCHandle.ToIntPtr(gh).ToInt64
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Mar 26, 2010
My problem is similar to the one described in this article, but I'm trying to use a different grid(DevExpress.xtraGrid) and therefore the answer (if it even works) does not apply for me: Binding Collection to DataGrid without showing all columns
Briefly, I'm binding the grid to the collection of custom objects - cMessage - to grid's datasource, but I don't want all the propertieties of the cMessage to be shown in the grid. Is there any way to hide some properties from the binding, while leaving them acessible from outside (ie.leave them as public or friend)?
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Oct 17, 2011
using a Binding Source to Bind my Collection to a ListBox? I can bind the class to the binding source, but im not sure how to let it know what type of list it is, or how to display the correct item.
I'm trying to get the listbox to display the ItemNames. Here's my class and collection class.
<System.Serializable()> Public Class SurveyItem
Private itemNm As String
Property ItemName() As String
[Code]....
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Aug 15, 2010
error in binding
Dadapter = New SqlDataAdapter(dat, conn)
Me.Dadapter.Fill(Me.Table)
bs.DataSource = Me.Table
DgvTire.DataSource = bs
txtserial.DataBindings.Add("text", Table, "serialn")
error: This causes two bindings in the collection to bind to the same property. Parameter name: binding
what should i do with this error?
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Mar 26, 2010
My problem is similar to the one described in this article, but I'm trying to use a different grid (DevExpress.xtraGrid) and therefore the answer (if it even works) does not apply for me: [URL]
Briefly, I'm binding the grid to the collection of custom objects - cMessage - to grid's datasource, but I don't want all the propertieties of the cMessage to be shown in the grid. Is there any way to hide some properties from the binding, while leaving them acessible from outside (ie.leave them as public or friend)?
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Oct 27, 2010
I need to bind a textblock.text property to a single element in an observable collection, or array element, and have the text update using the INotifyPropertyChanged or INotifyCollectionChanged, whichever is best.
Most examples describe ways to bind listboxes or other list views to entire collections, but my application needs to update several textblocks on a screen depending on notification of a change in one or more elements of an array.
textblock1.Text = MyArray(0)...
textblock2.Text = MyArray(1)...
textblock3.Text = MyArray(2)...
textblock4.Text = MyArray(3)...
Is it possible to bind a single textblock to a single array element? Is it possible to get notification of the proper type that will update one or more of the textblocks if any assigned element changes?
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Jul 27, 2011
I have a user control with its own context menu, however I need to add additional items to that menu.
The approach I took was to have a dependency property called ContextMenuItems:
Public Shared ReadOnly ContextMenuItemsProperty As DependencyProperty = DependencyProperty.Register("ContextMenuItems", GetType(ObservableCollection(Of MenuItem)), GetType(SmartDataControl), New FrameworkPropertyMetadata(New
[Code].....
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Sep 13, 2011
I have two datagridview's both are databound. First one shows items for sale and the second stores all the items that were sold. I am trying too transfer selected rows from one to the other but no matter what I keep getting told "Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound."
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Jan 10, 2009
I have the given XML file.
<!doctype mydata "http://www.w3.org/mydata">
<mydata>
<authors>
[Code]....
I want to bind it to the DataGridView and show it in a tree-like structure with the authors and editors shown seperately in expandable (+) symbols. I dont want to use DataSet. How do I do it using the XSD and the class file generated from it?
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May 10, 2010
i have an empty datagridview on FormA and calling a function in FormB to run a query and bind the results to FormA's datagridview. i receive no errors, but nothing shows up in the datagridview.here's my code (note: sql statement does return results within sql management studio)
vb.net
Public Sub GetRecorders(ByVal _sqlString As String)
Try[code].....
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Jul 16, 2009
It must be something stupid that I am doing - tring to bind a array list to a datagridview - this code wont display a thing.
[Code]...
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Nov 30, 2011
I have a grid populated from a list. Now there are particular properties in this list that I don't want displayed on the grid. It displays all of the columns perfectly, then adds 2 others I didn't originally have on the grid when I constructed it in designer mode. I have removed them after the binding with DataGridView.Columns.Remove("ColumName"). However, is there a way to prevent it from adding these beforehand, or is this the only way?
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Jan 13, 2010
I have a datagridview with a column made of comboboxes. Is it possible to bind them to the result of a query? I've been able to do that, but I need to bind each combobox to a different query, or better to the same query which is called with a different parameter.
So, I have column1 which is made of combos. The user selects an item, and in column2, which is made of combos as well, I get some items which are taken from a query where the parameter is the value the user selected in column1. After that, I have column3, made of combos, in which each combo is populated with values resulting from a query with 2 parameters: one is the value selected in column1 and the second from column2. And this should be for each row.
I've been able only to bind the combos of column1, which are all populated using the same query. I thought I could use an array of tables where the i-th element of the array has the table (populated by my query using the table adapter) which contains the element of the combo in row i. Is it possible to bind the combo in column_j and row_i to that table?
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Apr 5, 2010
I have a bit of code which loads data from a stored procedure in MS SQL Server and then loads the data to a datagridview, which works fine. What i want is for the code that connects / loads the data to sit in my Database Class and then everything associated with the datagridview to be stored in my Form but i am having problems passing the contents of the bindingsource over to the Form from the Database Class.
[Code]...
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Sep 28, 2011
I developed a windows forms app, using VisualBasic in VS 2010. In my form, first I declared a variable as DataTable (Dim VarTable as New DataTable).
Second, changed the DataSource property of my DataGridView (DataGridView1.Datasource=VarTable)
Third, I filled the VarTable in this way: using a resulset from SqlDataReader, i added row by row.
Dim Result As SqlDataReader=CommandSQL.ExecuteReader
Do While Result.Read()
Dim RowToAdd As DataRow
RowToAdd=VarTable.NewRow()
RowToAdd("Code")=Result("Code")
RowToAdd("Name")=Result("Name")
VarTable.Rows.Add(RowToAdd)
Loop
Fourth, after the user changed data in datagridview, I saved the data back to SQL, cleared VarTable (VarTable.Rows.Clear()), and back to top of form to accept a new code. But here, problems begin. When I execute again the whole code described, the datagridview dont show the entire rows, and sometimes crashed with different errors. Solution? Dont fill VarTable row by row. Use VarTable.Load(Result) to populate the VarTable. I don't know why now works, But just I wanted to share this information.
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Aug 25, 2009
Private Sub AddRowToDG(ByVal TempDt As DataTable) )
Me.dg.DataSource = TempDt
end sub
i get errorObject reference not set to an instance of an object when i try to bind the dgits some times works fine and some times gives me errorladil
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Feb 2, 2012
I have DataGridView which is 'binded' to dataset table. When I add new field to the table from access ,that field not appears in the datagrid. I am looking a way to refresh datagrid columns.I was try to delete datagridvew and add new datagridview with the same properties,but still last field(column) is missing. I was try to add new column manually, and I was set property name corresponding to the new field name. but data is not shown.
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Jun 17, 2011
I created two tables(FIRSTtable and SECONDtable) in the mysql database and two tables that are related.[code]...
Relations between the two tables using the product_id column with UpdateCascade and DeleteCascade. Both relationships are functioning normally when I try with the sql script. Suppose I delete all product_id in the FIRST table, all existing data in the SECOND table will be deleted.
Both of these tables displayed in datagridview. When I delete all the data in the FIRST table, the all rows in datagridview FIRST table will be deleted, also the data in mysql the FIRST table will be deleted.
I try to open the mysql database, the data are in SECOND Table also deleted, the problem why the view that in the second datagridview, can not be deleted, still keep the previous data? How to refresh datagridview binding in vb.net or C#? [code]...
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May 11, 2009
I have a datagridview that I am binding to a collection. What I need to do is process each object in the collection (send quotes to our customers), and then display the items status in the grid. Then once the collection is completely processed clear the grid of items for the next round. I am binding to the collection with .DataSource = collection.
My Question:What would be the best way to update the grid as the collection is processed one object at a time.Initially I had thought about storing each item in a database table and then bind the grid to the table. Then as I processed each record, update the record and rebind the grid. The problem I had with that method was that I would be constantly writing and deleting data from the same table. That seemed unnecessary vs just using a collection and updating the collection.
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Nov 15, 2011
I have two Structures, one of them is nested.
Public Structure RetailRpt
Public FromDate As Date
Public ToDate As Date
[Code]....
I've added the DSRPT structure from the datasource of the datagridview. but unfortunately I can't manage to show the nested structure data with [+] in the datagridview row.
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Apr 29, 2012
I have set up at DataGridView "cdgvExp" for data entry. cdgvExp.Datasource = ExpTab. The datagridview can accept new rows according to how many entries there are. I will then use the data in ExpTab. The Fourth colum is called "Lot" and is a combobox in the datagridview. The goal is to have the Combobox in the fourth column have the datasource be LotTab which is populated according to other choices in the form. I am hunting for something that would work like an independant combobox like cbLots.datasource = LotsTab
How do I dynamically set the Datasource and Datamember of a combobox that is already set up in a datagridview?
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Nov 24, 2009
In previous versions (VB.NET 2003) I would do
datagrid.datasource = dataset.tables(0)
datagrid.datamember = "Column1" 'Where this is the name of the column
This would show me just that column in the grid regardless of the number of columns in the dataset.
In VB.NET 2008 I do: datagridview1.datasource = dataset.tables(0)
I see all the columns.I then add:
datagridview1.datamember = "Column1" 'Where Column1 is the column name
I then have an empty grid.How does one get only a single column to show in the grid from a multi-column data source? I am using internal code to populate the datasets and tables.
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Feb 26, 2009
like this i have n number of questions in my word document. so my need is i need to read the questions and fill it up in the datagridview with yes or know chek box. my datagridview appearance would be as follows. so the peson who is viewing the questions and can make yes or know option using the check box.if the person chooses no option he has to enter the reason the reason column. so i have to do this dynamically. means that binding datagridview with checkbox ,textbox, data dynamically. how to do this please because after the datas entered in the datagridview i have to loop through rows and i have populate into another word document. so please if there is any sample
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May 17, 2011
How to binding MySQL VIEW(temporary table) to DataGridView ?
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Oct 27, 2010
I can't get my binding source to update from a DataGridView
This is how I'm loading the dataset into the dgv:
vb.net Dim sFileName = filelocation & "Checks.xls"
Dim connectionStringTemplate As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0;HDR=Yes;IMEX=1"""
Dim connectionString As String = String.Format(connectionStringTemplate, sFileName)
Dim sqlSelect As String = "SELECT * FROM [Sheet1$];"
Dim workbook As DataSet = New DataSet()
[Code]...
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Feb 20, 2012
I have one DataGridView named dgv.dgv is pretty much a plain gridview. No bounded data. No columns added. It's basically empty.I also have one DataTable named dt.I add rows and columns manually into dt.
dt.Columns.Add(New DataColumn("TexBox", GetType(String)))
dr = dt.NewRow()
dr("TextBox") = String.Empty
dt.Rows.Add(dr)
I then simply set dgv datasource into dt.
dgv.DataSource = dt
dgv.Refresh()
I then set the value for this particular cell.
dgv.Item(0,0).Value = "xxx"
Now when I run and execute all those commands. I happen to retrieve the gridview with that value indeed. The "xxx" cell appeared and currently it's uneditable.What I want to achieve is:Allow this "xxx" cell to be editable. Preferrably if it can be inserted into a TextBox control inside the cell.
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