在 C# Winforms 中的 DataGridViewCell 内绘制实心圆或矩形 [英] Drawing a filled circle or rectangle inside a DataGridViewCell in C# Winforms

问题描述

我想在 DataGridViewCell 的中心画一个小的实心圆.矩形也可以做到这一点.我想我必须在 CellPainting 事件中做到这一点.

I want to draw a small filled circle in the center of a DataGridViewCell. A rectangle can do the trick as well. I assume I must do it in the CellPainting event.

我已经试过了:

if (e.RowIndex >= 0 && e.ColumnIndex >= 0)
        {                
            if (dgv_Cuotas.Columns[e.ColumnIndex].Name == "Seleccionar" && Convert.ToBoolean(dgv_Cuotas.Rows[e.RowIndex].Cells["pagada"].Value) == true)
            {
                e.CellStyle.BackColor = Color.LightGray; ;
                e.PaintBackground(e.ClipBounds, true);
                e.Handled = true;
            }
        }

它正在绘制整个单元格，我只想要一个小圆圈或矩形，如下图所示:

Its painting the whole cell and I just want a small circle or rectangle as I show you in the next picture:

我怎样才能做到这一点? 使用 DataGridViewImageCell 不是一种选择，因为我遇到了格式错误.我只需将 DataGridViewCheckBoxCell 更改为 DataGridViewTextboxCell.

How can I achieve this? Using a DataGridViewImageCell is not an option because I´m having a formatting error. I just can change that DataGridViewCheckBoxCell to a DataGridViewTextboxCell.

我可以把它改成 DataGridViewImageCell ！！不知道之前发生了什么，但我仍然无法在那里加载图像.我只得到一个带红十字的白色方块(无图像图标).这是我的代码:

I can change it to DataGridViewImageCell!! Dont know what happened before, but I still can´t load the image there. I just get a white square with a red cross (No image icon). Here is my code:

dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"] = new DataGridViewImageCell();
dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"].Value = Properties.Resources.punto_verde;
dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"].Style.ForeColor = Color.White;
dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"].Style.SelectionForeColor = Color.White;

推荐答案

我终于解决了.我在同一个位置画了一个和复选框一样大小的实心矩形.

I finally resolved it. I drew a filled rectangle with the same size as the checkbox and in the same location.

我做了以下事情:

首先，我将 DataGridViewCheckBoxCell 更改为 DataGridViewTextBoxCell 以隐藏复选框.

First, I change the DataGridViewCheckBoxCell to DataGridViewTextBoxCell to hide the checkbox.

DataGridViewTextBoxCell blank_cell = new DataGridViewTextBoxCell();
dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"] = blank_cell;
dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"].Style.ForeColor = Color.Transparent;
dgv_Cuotas.Rows[row.Index].Cells["Seleccionar"].Style.SelectionForeColor = Color.Transparent;

一定要选择透明的前景色，以免在单元格中看到False".

Be sure of selecting transparent forecolor so as not to see "False" in the Cell.

在那之后，我只是使用 cellpainting 事件在单元格中绘制了矩形:

After that, I just painted the rectangle in the cell using the cellpainting event:

if (dgv_Cuotas.Columns[e.ColumnIndex].Name == "Seleccionar" && Convert.ToDecimal(dgv_Cuotas.Rows[e.RowIndex].Cells["Restante"].Value) == 0)
            {
                Color c1 = Color.FromArgb(255, 113, 255, 0);
                Color c2 = Color.FromArgb(255, 2, 143, 17);

                LinearGradientBrush br = new LinearGradientBrush(e.CellBounds, c1, c2, 90, true);
                ColorBlend cb = new ColorBlend();
                cb.Positions = new[] { 0, (float)1 };
                cb.Colors = new[] { c1, c2 };
                br.InterpolationColors = cb;

                Rectangle rect = new Rectangle(e.CellBounds.Location.X + 4, e.CellBounds.Location.Y + 4, 13, 13);

                e.Graphics.FillRectangle(br, rect);
                e.PaintContent(rect);
                e.Handled = true;
            }

您可以像我一样通过更改 Location.X 和 Location.Y 值来获取您想要的位置.

You can get the location you want by changing the Location.X and Location.Y values like I did.

希望对某人有所帮助！

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