datagridview

问题 I have a datagridview that contain 3 columns. But I hv not bind a datasource to datagridview. It has three columns. EmpName,InTime,OutTime I can edit EmpName in datagridview. I want to sort the content in the datagridview after i edit a row. I want to sort first by EmpName and then by InTime. The time is in AM , PM Time format (Ex: 2:00 PM). I can sort data by only one column. I have used, dgvSchedule.Sort(dgvSchedule.Columns[0],ListSortDirection.Ascending); But how to sort by multiple

问题 I've done my usual google searching but all of the topics I came across didn't seem to be doing this in the same way I am doing, or looking to do it in the same way. The closest I could find was this https://www.experts-exchange.com/questions/23555139/How-to-filter-values-in-DataGridViewComboBoxColumn.html Ignoring that this is VB and I'm working in C#, they have the dataset/source etc set at the top and creating new columns on a line by line basis, whereas I'm creating my data in the grid

问题 My system clock is 9/16/2014 (Tuesday) But in code, I'm always jumping to Monday. DayOfWeek dow = new DateTime().DayOfWeek; int columnNumber = 0; columnNumber = columnNumber + 0; foreach ( DataGridViewRow row in dataGridView1.Rows ) { switch ( dow ) { case DayOfWeek.Monday: columnNumber = 4; if ( (bool) row.Cells[4].Value == true ) // crashing here with NullReferenceException { row.Cells["activeTodayDataGridViewCheckBoxColumn"].Value = true; } break; I have a DataGridView Columns 0—3 are Text

问题 I want to display a number with a leading zero in a DataGridView but i don't know how. for example: 3910323 → 03910323 I've tried to add a leading zero to an int/string in a DataGridView and for some reason the DataGridView emits the zero. How can i format the cells in a way that a leading zero will be displayed? This is my code: string number = dgvCustomers[0, 0].Value.ToString(); number = "0" + number; dgvCustomers[0, 0].Value = number; 回答1: Try using dgv.Columns["myColumn"]

问题 I found some examples of how to create a excel file from a data grid view, however those just create the file. What I would like to do is have excel open, with a unsaved worksheet, and have the content of the data grid view (including header names) pasted in to the worksheet after pressing a "Export to Excel" button. Basically I want to automate what happens when you do a copy and paste from a data grid view in to excel. Any suggestions on how to do this? 回答1: Take a look at this tutorial,

问题 please if someone can help :( ,I'm looking at first to combine date and times (ex: ( DatetaskStart ,TimetaskStart) , (DatetaskEnd ,TimetaskEnd)). And throughout my dategridview I want make a subtraction between combinaision obtained ((date, time) of the beginning of the task ) and ((date,time) of end the task) and finally get the total times in hours of all the tasks obtained. Dim sql As String = "select id_task, DatetaskStart ,TimetaskStart , DatetaskEnd ,TimetaskEnd from task where id_task

问题 It appears that the only way to capture the keypress events within a cell of a DataGridView control in order to validate user input as they type, is to use the DataGridView controls OnEditControlShowing event, hook up a method to the edit control's (e.Control) keypress event and do some validation. My problem is that I've built a heap of custom DataGridView column classes, with their own custom cell types. These cells have their own custom edit controls (things like DateTimePickers and

问题 I have this code: private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { if (e.KeyChar == 13) { db database = new db(); database.set_connection(Properties.Settings.Default.connection); DataTable result = database.search(textBox1.Text, "", ""); if (result.Rows.Count == 0) { MessageBox.Show("nothing found", "error", MessageBoxButtons.OK, MessageBoxIcon.Information); textBox1.SelectAll(); textBox1.Focus(); } else { if (dataGridView1.Rows.Count == 0) { DataGridViewRow row = new

问题 I have a datagridview with lots of data, and when I add a new line, the first column's last row creates a new ComboBoxCell which contain four items. But I can't set the default value ("DropDown") for the combobox. Every time I must manually select "DropDown". What is the solution? DataGridViewComboBoxCell dgvCell = new DataGridViewComboBoxCell(); dgv[1, dgv.Rows.Count - 1] = dgvCell; string[] controltype = {"DropDown", "CheckBoxList", "ListControl", "Tree" }; dgvCell.DataSource = controltype;

问题 I have a datagridview with lots of data, and when I add a new line, the first column's last row creates a new ComboBoxCell which contain four items. But I can't set the default value ("DropDown") for the combobox. Every time I must manually select "DropDown". What is the solution? DataGridViewComboBoxCell dgvCell = new DataGridViewComboBoxCell(); dgv[1, dgv.Rows.Count - 1] = dgvCell; string[] controltype = {"DropDown", "CheckBoxList", "ListControl", "Tree" }; dgvCell.DataSource = controltype;