datagridview

问题 I have a form with a DataGridView and I want to set the columns AutoSizeMode to Fill and the grids ColumnHeadersHeightSizeMode to AutoSize . My problem is that if the mouse cursor accidentally hovers the upper left cell of the grid when the form loads, the application throws an InvalidOperationException . This is what I should see when the form loads: (Note how the cursor is hovering the upper left cell). This code will provoke the exception: static class Program { [STAThread] static void

问题 I have some trouble with setting the last row in my datagridview selected. I select the last row this way: if (grid.Rows.Count > 0) { try { grid.Rows[grid.Rows.Count - 1].Selected = true; grid.CurrentCell = grid.Rows[grid.Rows.Count - 1].Cells[1] } catch (IndexOutOfRangeException) { } catch (ArgumentOutOfRangeException) { } } When I execute this code I get an exception: IndexOutOfRangeException occurred : Index-1 does not have a value. When I debug the Rows collection and the corresponding

问题 I have a WinForm in C#. One of the column of the DataGridView is of type DataGridViewLinkColumn . How do I handle the click event on each column ? This code does not seem to work : private void UserDataTable_CellContentClick(object sender, DataGridViewCellEventArgs e) { //Code here } For instance, if I have 10 rows, whenever I click the content of each row corresponding to the column " DataGridViewLinkColumn ", I should be able to handle it. Thanks 回答1: Why don't you use CellClick event

问题 I have a DataGridView with the DataSource set to List<myClass> However, the new row indicator does not display when I set AllowUserToAddRows to true , When I set the DataSource to BindingList<myClass> , that seems to solve the problem. Q : Should replace my List<> with BindingList<> or there is better solution? 回答1: Does myClass have a public parameterless constructor? If not, you could derive from BindingList<T> and override AddNewCore to call your custom constructor. (edit) Alternatively -

问题 I have a DataGridView and I'm drawing TreeView-style dotted lines on the first cell of each row during its RowPostPaint event. When the first cell (which is a DataGridViewTextBoxCell ) is in editing mode, the lines aren't drawn. How do I handle painting for the editing control? The standard editing control doesn't have a Paint event, and I don't want to create a new type of cell if I can avoid doing so. 回答1: First set cell padding of your first column to 16 from left, so in view mode or edit

问题 I need to receive the key press events during cell editing in DataGridView control. From what I have found on the net the DataGridView is designed to pass all key events from DataGridView to the cell editing control and you cannot get these events easily. I found this piece of code that traps those events for DataGrid control, but that does not work for DataGridView . 回答1: Try this: class KeyPressAwareDataGridView : DataGridView { protected override void OnControlAdded(ControlEventArgs e) {

问题 I have setup a ComboBoxColumn for my DataGridView and set its selectable values from an enumeration. It mostly works as I would like with the following exception. Whenever I click the dropdown arrow and then select one of the enum values, it remains in sort of a "intermediate" state where the CellValueChanged event isn't triggered. I need to focus on another cell or another control for the event to fire. I also have an event handler for the DataGridView's Leaving event which "validates" the

问题 I have a DataGridView binded to a DataTable ( DataTable binded to database). I need to add a DataRow to the DataTable . I'm trying to use the following code: dataGridViewPersons.BindingContext[table].EndCurrentEdit(); DataRow row = table.NewRow(); for (int i = 0; i < 28; i++) { row[i] = i.ToString(); } But it doesn't work, DataGridView has never been added a new row. Please, tell me, how can I fix my code? Thank you in advance. 回答1: You can try with this code - based on Rows.Add method

问题 I have a DataGridView binded to a DataTable ( DataTable binded to database). I need to add a DataRow to the DataTable . I'm trying to use the following code: dataGridViewPersons.BindingContext[table].EndCurrentEdit(); DataRow row = table.NewRow(); for (int i = 0; i < 28; i++) { row[i] = i.ToString(); } But it doesn't work, DataGridView has never been added a new row. Please, tell me, how can I fix my code? Thank you in advance. 回答1: You can try with this code - based on Rows.Add method

问题 I have a search form in my program. When the user double-clicks a cell (of the dgv) on the search form, I want the program to close that form and jump to the item on the main form. I'm doing this by identifying each item with a unique id. I'm trying to pass the value of the rows id to the other form. The problem is that, it says that I'm passing the value zero each time. But when I insert some message boxes on the search form, it says that the integer 'id' has successfully been assigned to