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如何使用图标呈现数据绑定的WinForms DataGridView列?

datagridview winforms .net c#

Angle.Bracket · 技术社区 · 6 年前

在我的C#Windows窗体应用程序中,我有一个 DataGridView 这是必然的 BindingList<Item> 依次用字母缩写的列表 List<Item>

// bind view to controller
myDataGridView.DataBindings.Add("DataSource", myController, "Items");

// bind controller to model
Items = new BindingList<Item>(model.Items);

Item . 我为 数据表格控件 s CellFormatting 项目 类型:

myDataGridView.CellFormatting += new DataGridViewCellFormattingEventHandler(myontroller.HandleCellFormatting);

项目

1 回复 | 直到 6 年前

Reza Aghaei 6 年前

你需要处理 CellPainting 事件 DataGridView

此示例显示如何在绑定列中绘制图像 数据表格控件

Image zero, negative, positive;

Load 事件和来自文件、资源或存储图像并分配给这些变量的任何位置的图像。设置数据绑定。为要在其中绘制图标的单元格设置适当的左填充:

private void Form1_Load(object sender, EventArgs e)
{
    var list = new[] {
        new { C1 = "A", C2 = -2 },
        new { C1 = "B", C2 = -1 },
        new { C1 = "C", C2 = 0 },
        new { C1 = "D", C2 = 1 },
        new { C1 = "E", C2 = 2 },
    }.ToList();
    dataGridView1.DataSource = list;

    zero = new Bitmap(16, 16);
    using (var g = Graphics.FromImage(zero))
        g.Clear(Color.Silver);
    negative = new Bitmap(16, 16);
    using (var g = Graphics.FromImage(negative))
        g.Clear(Color.Red);
    positive = new Bitmap(16, 16);
    using (var g = Graphics.FromImage(positive))
        g.Clear(Color.Green);

    //Set padding to have enough room to draw image
    dataGridView1.Columns[1].DefaultCellStyle.Padding = new Padding(18, 0, 0, 0);
}

细胞绘画 数据表格控件

private void DataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    //We don't need custom paint for row header or column header
    if (e.RowIndex < 0 || e.ColumnIndex != 1) return;

    //We don't need custom paint for null value
    if (e.Value == null || e.Value == DBNull.Value) return;

    //Choose image based on value
    Image img = zero;
    if ((int)e.Value < 0) img = negative;
    else if ((int)e.Value > 0) img = positive;

    //Paint cell
    e.Paint(e.ClipBounds, DataGridViewPaintParts.All);
    e.Graphics.DrawImage(img, e.CellBounds.Left + 1, e.CellBounds.Top + 1,
        16, e.CellBounds.Height - 3);

    //Prevent default paint
    e.Handled = true;
}

手柄 FormClosing 事件来处理图像:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    //Dispose images
    if (zero != null) zero.Dispose();
    if (negative != null) negative.Dispose();
    if (positive != null) positive.Dispose();
}

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