datagridviewcombobox

问题 I'm trying to create a DataGridView bound to a DataTable where one column is a ComboBox. The code runs but I get the following error after binding (not when data is bound): System.ArgumentException: DataGridViewComboBoxCell value is not valid. In the DataGridView one of the columns is a DataGridViewComboBoxColumn that uses an enum (named structureType) as it's source: // ColumnStructure // this.ColumnStructure.ValueType = typeof(structureType); this.ColumnStructure.DataSource = Enum.GetValues

问题 I am creating a "Voting system" and i have problem on the ballot form. Every time i choose candidate in my combobox, the rest of the combobox will also change. here is my ballot form.. and when i choose my President candidate in my combobox1 this what happens.. I guess its because of my 'Candidate' table?? My issue here is how can i filter combobox1 like for example... listing All "president candidate on my combobox1. without affecting other comboboxes. PLEASE HELP Im a student and my Thesis

问题 Popular way (1, 2) for custom painting of items in DataGridViewComboBox is handling of event DataGridView1. EditingControlShowing and setting up DrawItem event handlers there: private void dataGridView1_EditingControlShowing( object sender, DataGridViewEditingControlShowingEventArgs e) { theBoxCell = (ComboBox) e.Control; theBoxCell.DrawItem += theBoxCell_DrawItem; theBoxCell.DrawMode = DrawMode.OwnerDrawVariable; } You see what is wrong: it uses control-level event to handle work for columns

问题 I am using vb.net 2010 and winforms and DataGridView. The DataGridView has a DataGridViewComboBox column. When I show the form with the DGV it shows this and empty grid but the column that contains the ComboBox shows the first item on the dropdown list. How can I have the ComboBox display nothing until it is clicked on and selected? 回答1: Try setting the combobox selectedindex property to -1 when you initialize it. That might fix your problem, but when I do the same thing that you described,

问题 Hi I have been banging my head against the wall all day trying to figure this out. I have a DataGridView that is displaying the results of an SQL Query The query returns 3 fields: GROUPNUM, GROUPNAME, COACHING The group fields just have strings in them and they are displaying fine, but the COACHING field is a single character field that will either have a Y or an N in it. For that column I want to have a combobox with Y or N as the items. Here is what I have so far. dtGroups is a data table

问题 I have a datagridview which has a combox column that contains two values. When a row's combobox value has been changed I'm updating the backend database with the change. The core problem is the data only changes after you click on the drop down arrow, and select the record. If you click on the combobox cell itself and select the value it doesn't do anything because the combobox selected item is empty. What's confusing me is this works correctly within Visual Studio apart from the initial

问题 Like the title says, I'm trying to populate a combo box column in a datagridview. Here's what i have so far: Dim lc As System.Web.UI.WebControls.ListItemCollection = _ DataAccess.Part.GetListItems() dgvcboPart.DataSource = lc ' This is a standalone combo box and it works ok cboTest.DataSource = lc Any suggestions as to what I'm missing ? Thanks Tony W 回答1: I first suggest you bind your Collection to a BindingSource and then add the BindingSource to the DataGridView (so you know the position)

问题 I want to create DataGridViewComboBoxColumn and attach to it's combo box Click event (i want to generate it's datasource on click only). 回答1: While I have no idea about why you need Click event of that ComboBox control, you can access that combo box using EditingControlShowing event: private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { //Check if the event is for your column, for example column 1 if (this.dataGridView1.CurrentCell

问题 I have a standard DataGridView , and my last column is a DataGridViewComboBoxColumn . I would like to add an event so that when the selected index of any of the rows in that column changes, an event is triggered and I save that data to db. I'm struggling with this for an hour or so and couldn't find any event that would trigger this... Any help would be appreciated!!! 回答1: In the EditingControlShowing event of the DataGridView attach a method to the combobox SelectedIndexChanged event. For

问题 im using SelectionChangeCommitted to catch the event when a combobox selected index changed, but I can not get it's new value or index. private void ruleList_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is ComboBox) { ComboBox comboBox = e.Control as ComboBox; comboBox.SelectionChangeCommitted += ruleListColumnComboSelectionChanged; } } private void ruleListColumnComboSelectionChanged(object sender, EventArgs e) { string value = ruleList