How to get DateTimePicker checkstate value for DataGridView?

Question

I have a DataGridview that has a DataTimePickerColumn , and DateTimePickerCell contains a checkstate. How to get checkstate value after editing checkstate?

Answer 1

Create a control that inherits from DateTimePicker and handle the DTN_DATETIMECHANGE notification. Then handle the DataGridView EditingControlShowing event to add a handler for the new CheckedChanged event in DateTimePicker, or even you can create your own DataGridViewColumn and Cell type with DateTimePickerEx as EditingControl:

 using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Diagnostics; public class DateTimePickerEx : DateTimePicker { private bool _checked; private const int WM_REFLECT = 0x2000; public event CheckedChangedEventHandler CheckedChanged; public delegate void CheckedChangedEventHandler(object sender, System.EventArgs e); public DateTimePickerEx() { this._checked = this.Checked; } private void WmDateTimeChange(ref Message m) { NMDATETIMECHANGE nmdatetimechange = m.GetLParam(typeof(NMDATETIMECHANGE)); if (nmdatetimechange.dwFlags == GetDateTimeValues.GDT_NONE) { if (this.ShowCheckBox && !this.Checked) { this._checked = false; if (CheckedChanged != null) { CheckedChanged(this, EventArgs.Empty); } } } else { if (this.ShowCheckBox && this.Checked && !this._checked) { this._checked = true; if (CheckedChanged != null) { CheckedChanged(this, EventArgs.Empty); } } this.Value = SysTimeToDateTime(nmdatetimechange.st); } m.Result = IntPtr.Zero; } private bool WmReflectCommand(ref Message m) { if (m.HWnd == this.Handle) { long code = NMHDR.FromMessage(m).code; switch (code) { case FWEx.Win32API.DateTimePickerNotifications.DTN_DATETIMECHANGE: this.WmDateTimeChange(ref m); return true; } return false; } } [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] protected override void WndProc(ref System.Windows.Forms.Message m) { if (m.Msg != 71 && m.Msg != 513) { switch ((WindowsMessages)m.Msg) { case WindowsMessages.WM_NOTIFY + WM_REFLECT: if (!this.WmReflectCommand(ref m)) { break; } return; break; } } base.WndProc(m); } private System.DateTime SysTimeToDateTime(SYSTEMTIME st) { return new System.DateTime(st.Year, st.Month, st.Day, st.Hour, st.Minute, st.Second); } /// <summary> /// This structure contains information about a change that has taken place in a date and time picker (DTP) control. /// This structure is used with the DTN_DATETIMECHANGE notification message. /// </summary> /// <remarks></remarks> [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct NMDATETIMECHANGE { /// <summary> /// NMHDR structure that contains information about the notification message. /// </summary> public NMHDR nmhdr; /// <summary> /// Specifies if the control was set to no date status (for DTS_SHOWNONE only). /// Also specifies whether the contents of the st member are valid and contain current time information. /// </summary> public GetDateTimeValues dwFlags; /// <summary> /// SYSTEMTIME structure that contains information about the current system date and time. /// </summary> public SYSTEMTIME st; } /// <summary> /// This structure contains information about a message. /// The pointer to this structure is specified as the lParam member of the WM_NOTIFY message. /// </summary> [StructLayout(LayoutKind.Sequential)] public struct NMHDR { /// <summary> /// Window handle to the control sending a message. /// </summary> public IntPtr hwndFrom; /// <summary> /// Identifier of the control sending a message. /// </summary> public IntPtr idFrom; /// <summary> /// Notification code. This member can be a control-specific notification code or it can be one of the common notification codes. The following values are supported if you include mouse support in your device platform: /// - NM_RCLICK /// - NM_RDBCLICK /// </summary> public int code; public static NMHDR FromMessage(System.Windows.Forms.Message msg) { return (NMHDR)msg.GetLParam(typeof(NMHDR)); } } /// <summary> /// Specifies a date and time, using individual members for the month, day, year, weekday, hour, minute, second, and millisecond. /// The time is either in coordinated universal time (UTC) or local time, depending on the function that is being called. /// </summary> /// <remarks> /// It is not recommended that you add and subtract values from the SYSTEMTIME structure to obtain relative times. /// </remarks> public struct SYSTEMTIME { /// <summary> /// The year. The valid values for this member are 1601 through 30827. /// </summary> public short Year; /// <summary> /// The month. /// </summary> public short Month; /// <summary> /// The day of the week. Sunday = 0. /// </summary> public short DayOfWeek; /// <summary> /// The day of the month. The valid values for this member are 1 through 31. /// </summary> public short Day; /// <summary> /// The hour. The valid values for this member are 0 through 23. /// </summary> public short Hour; /// <summary> /// The minute. The valid values for this member are 0 through 59. /// </summary> public short Minute; /// <summary> /// The second. The valid values for this member are 0 through 59. /// </summary> public short Second; /// <summary> /// The millisecond. The valid values for this member are 0 through 999. /// </summary> public short Milliseconds; } public enum GetDateTimeValues { /// <summary> /// Error. /// </summary> GDT_ERROR = -1, /// <summary> /// The control is not set to the no date status. /// The st member contains the current date and time. /// </summary> GDT_VALID = 0, /// <summary> /// The control is set to no date status. /// The no date status applies only to controls that are set to the DTS_SHOWNONE style. /// </summary> GDT_NONE = 1 } public enum WindowsMessages { /// <summary> ///Sent by a common control to its parent window when an event has occurred or the control requires some information. /// </summary> WM_NOTIFY = 0x4e } public enum DateTimePickerNotifications { DTN_FIRST = -740, DTN_LAST = -745, DTN_FIRST2 = -753, DTN_LAST2 = -799, DTN_DATETIMECHANGE = DTN_FIRST2 - 6, DTN_USERSTRING = DTN_FIRST2 - 5, DTN_WMKEYDOWN = DTN_FIRST2 - 4, DTN_FORMAT = DTN_FIRST2 - 3, DTN_FORMATQUERY = DTN_FIRST2 - 2, DTN_DROPDOWN = DTN_FIRST2 - 1, DTN_CLOSEUP = DTN_FIRST2 } } 

Handle DateTimePickerEx.CheckedChanged in DataGridView.EditingControlShowing:

  private void dgv_EditingControlShowing(System.Object sender, System.Windows.Forms.DataGridViewEditingControlShowingEventArgs e) { switch (this.dgv.CurrentCellAddress.X) { case 0: // your DateTimePickerEx column number DateTimePickerEx dtp = e.Control as DateTimePickerEx; if (dtp != null) { dtp.CheckedChanged += (object sen, EventArgs ea) => { //TODO: Add your code here }; } break; } }