我已经扩展了DataGridView单元格,使其在角落中显示来自其Tag属性的文本(例如,在日历的角落中显示日期数字),我希望能够指定文本的颜色和透明度。
为实现此目的,我已将两个属性添加到子类化的DataGridView单元格中,但它们在运行时没有存储它们的值。这是DataGridViewCell和Column:
我按照以下方式添加列:
然而,如果我在
为实现此目的,我已将两个属性添加到子类化的DataGridView单元格中,但它们在运行时没有存储它们的值。这是DataGridViewCell和Column:
class DataGridViewLabelCell : DataGridViewTextBoxCell
{
private Color _textColor;
private int _opacity;
public Color TextColor { get { return _textColor; } set { _textColor = value; } }
public int Opacity { get { return _opacity; } set { _opacity = value; } }
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);
Font font = new Font("Arial", 25.0F, FontStyle.Bold);
graphics.DrawString(tag, font, new SolidBrush(Color.FromArgb(_opacity, _textColor)), cellBounds.X, cellBounds.Y);
}
}
}
public class DataGridViewLabelCellColumn : DataGridViewColumn
{
public DataGridViewLabelCellColumn(Color TextColor, int Opacity = 128)
{
DataGridViewLabelCell template = new DataGridViewLabelCell();
template.TextColor = TextColor;
template.Opacity = Opacity;
this.CellTemplate = template;
}
}
我按照以下方式添加列:
col = new DataGridViewLabelCellColumn(Color.Blue, 115);
dgv.Columns.Add(col);
col.HeaderText = "Saturday";
col.Name = "Saturday";
然而,如果我在
graphics.DrawString
这行代码上加一个断点,那么无论是_textColor
还是_opacity
都没有值。如果我按如下方式指定默认值:private Color _textColor = Color.Red;
private int _opacity = 128;
那么它可以正常工作。我应该如何确保这些值被存储在CellTemplate中?