我有一个数据库，其中的字段代表以分钟为单位的时间。但在我的datagridview中，我不想将时间显示为hh：mm。例如。 130分钟应显示为02:10，编辑时带有蒙版文本框。我创建了一个DataGridView并在时间列中放置了名为MaskedTextboxMinutes的custum列类，并创建了一个用于处理编辑的自定义控件。我只在编辑单元格时显示文本框，不进行编辑时（我不希望在不编辑单元格时显示文本框）。当不以分钟编辑原始int字段值（例如130）时，显示。创建MaskedTextboxMinutes以将分钟作为输入和输出，但显示为hh：mm。问题是，我在哪里放置一些代码来覆盖列的显示方式？我想避免重写onpaint。
这些是我的MaskedTextBoxMinutes和DataGridView单元格，列和控件的类：
时间等级：
class Time
{
public int Hours { get; set; }
public int Minutes { get; set; }
public override string ToString()
{
string h = Hours.ToString("D2");
if (h.Length == 1)
h = "0" + h;
return Hours.ToString("D2") + ":" + Minutes.ToString("D2");
}
public static Time Parse(string time)
{
Time t = new Time();
t.Hours = 0;
t.Minutes = 0;
if (!string.IsNullOrEmpty(time))
{
time = time.Replace("\r", "").Replace("\n", "").Replace("\t", "").Replace(" ", "").Trim(); // Remove whitespace chars
if (time.IndexOf(",") >= 0 || time.IndexOf(".") >= 0 || time.IndexOf(":") < 0)
throw new Exception("Not a valid time: " + time + " should be format hh:mm");
string[] hm = time.Split(':');
if (string.IsNullOrEmpty(hm[0]))
hm[0] = "0";
if (string.IsNullOrEmpty(hm[1]))
hm[1] = "0";
t.Hours = int.Parse(hm[0]);
t.Minutes = int.Parse(hm[1]);
}
return t;
}
public static Time FromMinutes(int minutes)
{
int hours = minutes / 60;
minutes -= (hours * 60);
Time t = new Time();
t.Hours = hours;
t.Minutes = minutes;
return t;
}
public int getTotalMinutes()
{
return Hours * 60 + Minutes;
}
}
Class MaskedTextBoxMinutes：
class MaskedTextBoxMinutes : MaskedTextBox
{
public override string Text
{
get
{
Time t = Time.Parse(base.Text);
return t.getTotalMinutes().ToString();
}
set
{
int minutes = 0;
int.TryParse(value, out minutes);
base.Text = Time.FromMinutes(minutes).ToString();
}
}
}
类MaksedEditControl：
class MaskedEditingControl : MaskedTextBoxMinutes, IDataGridViewEditingControl
{
private DataGridView dataGridViewControl;
private bool valueIsChanged = false;
private int rowIndexNum;
public MaskedEditingControl() : base()
{
this.Mask = "00:00";
this.InsertKeyMode = InsertKeyMode.Overwrite;
}
public object EditingControlFormattedValue
{
get { return this.Text; }
set { this.Text = value.ToString(); }
}
public bool EditingControlWantsInputKey(Keys key, bool dataGridViewWantsInputKey)
{
return true;
}
public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
{
return this.Text;
}
public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
this.ForeColor = dataGridViewCellStyle.ForeColor;
this.BackColor = dataGridViewCellStyle.BackColor;
}
public int EditingControlRowIndex
{
get { return rowIndexNum; }
set { rowIndexNum = value; }
}
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
}
public bool RepositionEditingControlOnValueChange
{
get { return false; }
}
public DataGridView EditingControlDataGridView
{
get { return dataGridViewControl; }
set { dataGridViewControl = value; }
}
public bool EditingControlValueChanged
{
get { return valueIsChanged; }
set { valueIsChanged = value; }
}
public Cursor EditingControlCursor
{
get { return base.Cursor; }
}
Cursor IDataGridViewEditingControl.EditingPanelCursor
{
get { return EditingControlCursor; }
}
protected override void OnTextChanged(System.EventArgs e)
{
// Notify the DataGridView that the contents of the cell have changed.
valueIsChanged = true;
if (this.EditingControlDataGridView!=null)
this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
base.OnTextChanged(e);
}
}
Class MaskedEditColumn：
public class MaskedEditColumn : DataGridViewColumn
{
public MaskedEditColumn()
: base(new MaskedEditCell())
{
}
public override DataGridViewCell CellTemplate
{
get { return base.CellTemplate; }
set
{
if ((value != null) && !value.GetType().IsAssignableFrom(typeof(MaskedEditCell)))
{
throw new InvalidCastException("Must be a MaskedEditCell");
}
base.CellTemplate = value;
}
}
private MaskedEditCell MaskedEditCellTemplate
{
get { return this.CellTemplate as MaskedEditCell; }
}
}
Class MaskedEditCell：
public class MaskedEditCell : DataGridViewTextBoxCell
{
public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
// Set the value of the editing control to the current cell value.
base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
MaskedEditColumn mecol = (MaskedEditColumn)OwningColumn;
MaskedEditingControl ctl = (MaskedEditingControl)DataGridView.EditingControl;
ctl.Text = this.Value.ToString();
}
public override Type EditType
{
// Return the type of the editing contol that CalendarCell uses.
get { return typeof(MaskedEditingControl); }
}
public override Type ValueType
{
// Return the type of the value that CalendarCell contains.
get { return typeof(string); }
}
public override object DefaultNewRowValue
{
// Use the current date and time as the default value.
get { return ""; }
}
protected override void Paint(System.Drawing.Graphics graphics, System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle cellBounds, int rowIndex, System.Windows.Forms.DataGridViewElementStates cellState, object value, object formattedValue, string errorText, System.Windows.Forms.DataGridViewCellStyle cellStyle, System.Windows.Forms.DataGridViewAdvancedBorderStyle advancedBorderStyle,
System.Windows.Forms.DataGridViewPaintParts paintParts)
{
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle,
paintParts);
}
}
祝你好运 汉斯米林......
答案 0 :(得分：0)
感谢Crowcoder，我使用CellFormatting事件解决了它：
private void dgvTidsregistrering_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
DataGridView dgv = (DataGridView)sender;
if (dgv.Columns[e.ColumnIndex].CellType == typeof(MaskedEditCell))
{
double minutes = 0;
if (e.Value is double)
minutes = Convert.ToInt32(e.Value);
else
{
if (e.Value == DBNull.Value)
minutes = 0;
else
double.TryParse((string)e.Value, out minutes);
}
Time t = Time.FromMinutes((int)minutes);
e.Value = t.ToString();
}
}