C#DataGridView在同一单元格中显示图像和文本
我需要在同一列中动态添加图像和文本。我遵循了许多例子,但没有一个是有效的。也参考了以下内容,但在参考上述文章时出现了强制转换错误。无法将类型为C#DataGridView在同一单元格中显示图像和文本,c#,datagridview,C#,Datagridview,我需要在同一列中动态添加图像和文本。我遵循了许多例子,但没有一个是有效的。也参考了以下内容,但在参考上述文章时出现了强制转换错误。无法将类型为System.Windows.Forms.DataGridViewImageCell的对象强制转换为类型DataGridViewCustom.TextAndImageCell 有人能帮忙吗?我在你共享的链接上没有找到任何代码,我会给你我以前用过的代码 1-首先创建新的类名itTextAndImageColumn.cs: 这是类代码: using Syst
System.Windows.Forms.DataGridViewImageCell
的对象强制转换为类型DataGridViewCustom.TextAndImageCell
有人能帮忙吗?我在你共享的链接上没有找到任何代码,我会给你我以前用过的代码 1-首先创建新的类名it
TextAndImageColumn.cs
:
这是类代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
namespace TradeGrid
{
public class TextAndImageColumn : DataGridViewTextBoxColumn
{
private Image imageValue;
private Size imageSize;
public TextAndImageColumn()
{
this.CellTemplate = new TextAndImageCell();
}
public override object Clone()
{
TextAndImageColumn c = base.Clone() as TextAndImageColumn;
c.imageValue = this.imageValue;
c.imageSize = this.imageSize;
return c;
}
public Image Image
{
get { return this.imageValue; }
set
{
if (this.Image != value)
{
this.imageValue = value;
this.imageSize = value.Size;
if (this.InheritedStyle != null)
{
Padding inheritedPadding = this.InheritedStyle.Padding;
this.DefaultCellStyle.Padding = new Padding(imageSize.Width,
inheritedPadding.Top, inheritedPadding.Right,
inheritedPadding.Bottom);
}
}
}
}
private TextAndImageCell TextAndImageCellTemplate
{
get { return this.CellTemplate as TextAndImageCell; }
}
internal Size ImageSize
{
get { return imageSize; }
}
}
public class TextAndImageCell : DataGridViewTextBoxCell
{
private Image imageValue;
private Size imageSize;
public override object Clone()
{
TextAndImageCell c = base.Clone() as TextAndImageCell;
c.imageValue = this.imageValue;
c.imageSize = this.imageSize;
return c;
}
public Image Image
{
get
{
if (this.OwningColumn == null ||
this.OwningTextAndImageColumn == null)
{
return imageValue;
}
else if (this.imageValue != null)
{
return this.imageValue;
}
else
{
return this.OwningTextAndImageColumn.Image;
}
}
set
{
if (this.imageValue != value)
{
this.imageValue = value;
this.imageSize = value.Size;
Padding inheritedPadding = this.InheritedStyle.Padding;
this.Style.Padding = new Padding(imageSize.Width,
inheritedPadding.Top, inheritedPadding.Right,
inheritedPadding.Bottom);
}
}
}
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)
{
// Paint the base content
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,
value, formattedValue, errorText, cellStyle,
advancedBorderStyle, paintParts);
if (this.Image != null)
{
// Draw the image clipped to the cell.
System.Drawing.Drawing2D.GraphicsContainer container =
graphics.BeginContainer();
graphics.SetClip(cellBounds);
graphics.DrawImageUnscaled(this.Image, cellBounds.Location);
graphics.EndContainer(container);
}
}
private TextAndImageColumn OwningTextAndImageColumn
{
get { return this.OwningColumn as TextAndImageColumn; }
}
}
}
2-之后单击Datagridview
(设计模式)的编辑列,然后
将列类型:DataGridViewTextBoxColumn
更改为列类型:文本和图像列
3-使用用户控件添加具有2个不同图像(16 x 16).png文件的图像列表
4-然后添加一种方法,在DataGridView
的一个单元格中显示图像和文本值:
public void ImageRowDisplay()
{
((TextAndImageCell)_TradeGrid.Rows[0].Cells[0]).Image = (Image)imageList1.Images[1];
}
5-然后在按钮单击事件上使用文本和图像单元格在网格行上添加数据
private void btnInsertData_Click(object sender, EventArgs e)
{
//Code to insert rows on the grid.
ImageRowDisplay();
}
参考这样比较好
graphics.DrawImageUnscaled(this.Image, new Point(cellBounds.Location.X + 2, cellBounds.Location.Y + ((cellBounds.Height-this.Image.Height)/2)));
可以将DataGridView单元格动态转换为DataGridViewTextBoxCell(),并向该列显示文本值。下面是一个代码示例,它为您提供了一些基本概念
private void DisplayButton_Click(object sender, EventArgs e)
{
dataGridView1.Rows[3].Cells["ImageCol"] = new DataGridViewTextBoxCell();
dataGridView1.Rows[3].Cells["ImageCol"].Value = "Hello..";
}
在运行时更改行高度时,还必须处理这种情况,因为图像仍与单元格顶部对齐 要避免这种情况,您可以更新位置:
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)
{
// Paint the base content
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,
value, formattedValue, errorText, cellStyle,
advancedBorderStyle, paintParts);
if (this.Image != null)
{
// Draw the image clipped to the cell.
System.Drawing.Drawing2D.GraphicsContainer container =
graphics.BeginContainer();
graphics.SetClip(cellBounds);
// ====> Recalculate Location to have a Middle alignment
int verticalPosition = cellBounds.Y + ( (cellBounds.Height/2) - (this.Image.Height/2) );
cellBounds.Location = new Point(cellBounds.X, verticalPosition);
graphics.DrawImageUnscaled(this.Image, cellBounds.Location);
graphics.EndContainer(container);
}
}
您从哪里获得异常?发布代码让生活更轻松。。。你能添加异常的堆栈跟踪吗。