datagridview

问题 Very specific question, I know. I'm not sure how best to word this. Currently, my cell_formatting method will change the color of a cell based on its value: dataGridView.CellFormatting += new System.Windows.Forms.DataGridViewCellFormattingEventHandler(this.cell_formatting); .... public void cell_formatting(object sender, System.Windows.Forms.DataGridViewCellFormattingEventArgs e) { if (dataGridView.Columns[e.ColumnIndex].Name.Equals("LocCode")) { if (e.Value.ToString() == "OK") { e.CellStyle

问题 How can I dynamically detect the characters in a DataGridView cell(while it is being edited)? For example, I have a Winforms application with a DataGridView and a TextBox private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is TextBox) { var tbox = (e.Control as TextBox); // De-register the event FIRST so as to avoid multiple assignments (necessary to do this or the event // will be called +1 more time each time it's

问题 How can I dynamically detect the characters in a DataGridView cell(while it is being edited)? For example, I have a Winforms application with a DataGridView and a TextBox private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is TextBox) { var tbox = (e.Control as TextBox); // De-register the event FIRST so as to avoid multiple assignments (necessary to do this or the event // will be called +1 more time each time it's

问题 I'm implementing a custom NumericUpDown cell into my dataGridView using this tutorial from Microsoft: https://msdn.microsoft.com/en-us/library/aa730881(v=vs.80).aspx It's working good, but the problem is that when Im NOT editing its value, my form/grid start to flick like crazy, and when I click to edit the value it stop. My form is already "Double Buffered", so I'm not sure what to do anymore. The code can be find in the link above, but I'm posting both classes I'm using to make it work:

问题 I'm using Windows Forms and have a DataGridView with a DataGridViewComboBoxColumn that is bound to a data source. When the user chooses a different item from the combo box, I'd like to immediately change the row color to indicate this new selection. I've tested several events such as CellValueChanged and RowPrePaint, but these requires that the user clicks off the row after making the selection. It seems like the row doesn't update immediately. Instead, it updates after the user clicks off

问题 I'm following the example on MSDN for using the RowPrePaint event to custom paint my rows. http://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.rowprepaint(v=vs.110).aspx I only want to custom paint some rows, not all. I also have an alternating row style applied. When I stepped through the debugger I was able to watch the program paint the row according to the example in MSDN (a subtle gradient), but as soon as the RowPrePaint event handler returned the program repainted

问题 I have a form WinForms form window with a DataGridView. It pulls data from a SQL Server Express database using Linq and displays it in the DataGridView columns properly. I have it set in the properties to allow editing. When I edit and change a field during runtime it will only update the database if I specify one column name. This doesn't work well because I need it to update the column I edit, not the one hard coded. It needs to be dynamic. See the comments next to site.??? I can choose a

问题 I wanted to check/tick a column created with DataGridViewCheckBoxColumn on runtime. here's a snippet of my code; Dim checkCol As DataGridViewCheckBoxColumn = New DataGridViewCheckBoxColumn() DataGridView1.Columns.Add(checkCol) After I added this column, I wanted to check/tick some of these checkboxes on start up of the VB application. How do I do that? Do I have to make use of some of the methods from Checkbox Class? thanks 回答1: A CheckBox accepts two values: True (checked) or False

问题 Just as a starting note: I'm going through an existing app which was passed down to us and trying to go through and fix the bugs. I've been having issues with one particular DataGridView erroring out; giving me a Unique Constraint Exception on the ID. The strange thing is that I don't receive this error when I add the new item to the table, I receive it when I try to select a row (any row, it doesn't have to be the newly added item) in the DataGridView. When you add an item to this table it

问题 I just want to retrieve data from a Firebase to DataGridView. The code I have is retrieving data already, however, it's retrieving everything to the same row instead of creating a new one. I'm a beginner in coding, so I really need help with that. I read online that Firebase doesn't "Count" data, so it'd be needed to create a counter, so each time I add or delete data, an update would be needed. I did it and it's working. I created a method to load the data. private async Task firebaseData()