如何添加标签到DataGridView单元格
本文关键字：DataGridView 单元格 加标签 何添 | 更新日期: 2023-09-27 17:49:16
是否有任何方法在运行时插入标签到DataGridView单元格-例如，我想在每个单元格的顶部角落有一个小红色数字?我是否需要创建一个新的DataGridViewColumn类型，或者我可以在那里添加一个标签，当我填充DataGridView?
EDIT我现在正试图按照Neolisk的建议使用Cell绘画来做到这一点，但我不确定如何实际获得要显示的标签。我有以下代码，在设置单元格的Value之前，我现在将标签文本添加为单元格的Tag:
private void dgvMonthView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
DataGridView dgv = this.dgvMonthView;
DataGridViewCell cell = dgv[e.ColumnIndex, e.RowIndex];
Label label = new Label();
label.Text = cell.Tag.ToString();
label.Font = new Font("Arial", 5);
label.ForeColor = System.Drawing.Color.Red;
}
谁能解释一下我现在如何"附加"label到cell ?
编辑2 -解决方案我不能完全得到它的工作上述方式，所以已经结束了子类化的DataGridViewColumn和单元格和覆盖Paint事件那里添加任何文本存储在Tag使用DrawString而不是标签按照neolisk的建议:
class DataGridViewLabelCell : DataGridViewTextBoxCell
{
protected override void Paint(Graphics graphics,
Rectangle clipBounds,
Rectangle cellBounds,
int rowIndex,
DataGridViewElementStates cellState,
object value,
object formattedValue,
string errorText,
DataGridViewCellStyle cellStyle,
DataGridViewAdvancedBorderStyle advancedBorderStyle,
DataGridViewPaintParts paintParts)
{
// Call the base class method to paint the default cell appearance.
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,
value, formattedValue, errorText, cellStyle,
advancedBorderStyle, paintParts);
if (base.Tag != null)
{
string tag = base.Tag.ToString();
Point point = new Point(base.ContentBounds.Location.X, base.ContentBounds.Location.Y);
graphics.DrawString(tag, new Font("Arial", 7.0F), new SolidBrush(Color.Red), cellBounds.X + cellBounds.Width - 15, cellBounds.Y);
}
}
}
public class DataGridViewLabelCellColumn : DataGridViewColumn
{
public DataGridViewLabelCellColumn()
{
this.CellTemplate = new DataGridViewLabelCell();
}
}
实现为:
DataGridViewLabelCellColumn col = new DataGridViewLabelCellColumn();
dgv.Columns.Add(col);
col.HeaderText = "Header";
col.Name = "Name";
如果你正在做自定义绘画，你应该使用图形。DrawString代替Label控件。您的e类型为DataGridViewCellPaintingEventArgs，因此它具有Graphics属性。下面是一个使用PaintEventArgs的例子，你的应该是类似的
这是一个关于如何在Winforms DataGridViewCell中托管控件的MSDN教程。
按照标签
也许这可以解决你的问题
class LabelColumn : DataGridViewColumn
{
public LabelColumn()
: base(new LabelCell())
{
}
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
if (value != null &&
!value.GetType().IsAssignableFrom(typeof(LabelCell)))
{
throw new InvalidCastException("Must be a CalendarCell");
}
base.CellTemplate = value;
}
}
}
public class LabelCell : DataGridViewTextBoxCell
{
public LabelCell()
: base()
{
}
public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
LabelEditingControl lb = DataGridView.EditingControl as LabelEditingControl;
if (this.Value == null)
{
lb.Value = this.DefaultNewRowValue;
}
else
{
lb.Value = this.Value;
}
}
public override Type EditType
{
get
{
// Return the type of the editing control that CalendarCell uses.
return typeof(LabelEditingControl);
}
}
public override Type ValueType
{
get
{
// Return the type of the value that CalendarCell contains.
return typeof(string);
}
}
public override object DefaultNewRowValue
{
get
{
// Use the "".
return "";
}
}
class LabelEditingControl : Label, IDataGridViewEditingControl
{
DataGridView dataGridView;
private bool valueChanged = false;
int rowIndex;
public Object Value { get; set; }
public LabelEditingControl()
{
this.Enabled = false;
}
public object EditingControlFormattedValue
{
get
{
return this.Value.ToString();
}
set
{
if (value is String)
{
try
{
// This will throw an exception of the string is
// null, empty, or not in the format of a date.
this.Value = value;
}
catch
{
// In the case of an exception, just use the
// default value so we're not left with a null
// value.
this.Value = "";
}
}
}
}
public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
}
public void ApplyCellStyleToEditingControl(
DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
this.ForeColor = dataGridViewCellStyle.ForeColor;
this.BackColor = dataGridViewCellStyle.BackColor;
}
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
}
public bool EditingControlWantsInputKey(
Keys key, bool dataGridViewWantsInputKey)
{
// Let the DateTimePicker handle the keys listed.
switch (key & Keys.KeyCode)
{
case Keys.Left:
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Home:
case Keys.End:
case Keys.PageDown:
case Keys.PageUp:
return true;
default:
return !dataGridViewWantsInputKey;
}
}
// Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit
// method.
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
}
public bool RepositionEditingControlOnValueChange
{
get
{
return false;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlDataGridView property.
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingControlValueChanged property.
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
}
// Implements the IDataGridViewEditingControl
// .EditingPanelCursor property.
public Cursor EditingPanelCursor
{
get
{
return base.Cursor;
}
}
}
}
写下面的代码
LabelColumn clm = new LabelColumn();
dataGridView1.Columns.Add(clm);
dataGridView1.Rows.Add(5);
foreach (DataGridViewRow row in this.dataGridView1.Rows)
{
row.Cells[0].Value ="hello"; //or do anything desired
}