如何使 DataGridView 的宽度和高度适合其内容? [英] How to fit DataGridView width and height to its content?

问题描述

我有一种动态创建 DataGridView 的方法，但是当它显示出来时，宽度大于内容宽度(列的总宽度).高度也没有足够的长度来满足行的长度.

I have a method to create DataGridView dynamically but when it is shown up, the width is greater than the content width (total width of the columns). Also the height has not enough length to meet the length of the rows.

我试过用这个方法，但没用:

    DataGridView CreateInputBox(int proc, int mac)
        {
            DataGridView databox = new DataGridView();
            for (int i = 0; i < mac; i++)
            {
                databox.Columns.Add("col" + (i + 1), "M" + (i + 1));
                databox.Columns[i].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                databox.Columns[i].SortMode = DataGridViewColumnSortMode.NotSortable;
            }
            databox.RowTemplate.DefaultHeaderCellType = typeof(CustomHeaderCell);
            databox.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders;
            databox.RowHeadersDefaultCellStyle.Padding = new Padding(2);
            for (int i = 0; i < proc; i++)
            {
                databox.Rows.Add();
                databox.Rows[i].HeaderCell.Value = "P" + (i + 1);
            }
            databox.DefaultCellStyle.SelectionBackColor = Color.LightGray;
            databox.AllowUserToAddRows = false;
            databox.AllowUserToDeleteRows = false;
            databox.AllowUserToOrderColumns = false;
            databox.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
            databox.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;

            //This block doesn't work
            var totalHeight = databox.Rows.GetRowsHeight(DataGridViewElementStates.None);
            var totalWidth = databox.Columns.GetColumnsWidth(DataGridViewElementStates.None);
            databox.Width = totalWidth;
            databox.Height = totalHeight;
            //
            return databox;
        }
    public class CustomHeaderCell : DataGridViewRowHeaderCell
    {
        protected override Size GetPreferredSize(Graphics graphics, DataGridViewCellStyle cellStyle, int rowIndex, Size constraintSize)
        {
            var size1 = base.GetPreferredSize(graphics, cellStyle, rowIndex, constraintSize);
            var value = string.Format("{0}", this.DataGridView.Rows[rowIndex].HeaderCell.FormattedValue);
            var size2 = TextRenderer.MeasureText(value, cellStyle.Font);
            var padding = cellStyle.Padding;
            return new Size(size2.Width + padding.Left + padding.Right, size1.Height);
        }
        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)
        {
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, DataGridViewPaintParts.Background);
            base.PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle);
            TextRenderer.DrawText(graphics, string.Format("{0}", formattedValue), cellStyle.Font, cellBounds, cellStyle.ForeColor);
        }
    }

结果:

如您所见，DataGridView 控件的宽度如此之长.我怎样才能适应这两个维度?

As you can see the width of the DataGridView control is so long. How can I fit it for both dimension?

推荐答案

主要问题是你新创建的DataGridView在添加到父容器之前还没有完成内部布局，依然会报宽度为 100 的所有列.

The main problem is that your newly created DataGridView has not finished its internal layout before being added to a parent container and will still report all columns as having a width = 100.

修复它的一种方法是在显示 DGV 之后调用调整函数:

One way to fix it is to call a sizing function after the DGV has been displayed:

void sizeDGV(DataGridView dgv)
{
    DataGridViewElementStates states = DataGridViewElementStates.None;
    dgv.ScrollBars = ScrollBars.None;
    var totalHeight = dgv.Rows.GetRowsHeight(states) + dgv.ColumnHeadersHeight;
    totalHeight += dgv.Rows.Count * 4  // a correction I need
    var totalWidth = dgv.Columns.GetColumnsWidth(states) + dgv.RowHeadersWidth;
    dgv.ClientSize = new Size(totalWidth , totalHeight );
}

请注意，我在此过程中修复了一些问题:

Note that I have fixed a few things along the way:

• 宽度和高度都不包括标题
• 改变外部尺寸会忽略边框.我改为更改 ClientSize.
• 在调整大小之前，我们需要关闭滚动条.

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