Question

我正在以编程方式构建DataGridView表并将其放在表单上的GroupBox中。

我插入数据，然后自动调整列以适应数据。然后我想将groupbox的大小调整为DataGridView的大小。对于每个列和行，我得到它们各自的宽度和高度，技术上应该是准确的，并更新面板和整体DataGridView大小。

问题是Column.Width始终返回100像素而不管其实际大小（请参见屏幕截图：实际列宽约为30px，而不是100）。如果我手动输入width = 90像素，则调整大小非常准确！

matrix = new DataGridView();
//modify behaviour
matrix.ColumnHeadersVisible = false;
matrix.AllowUserToResizeColumns = false;
matrix.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
matrix.RowHeadersVisible = false;
matrix.AllowUserToResizeRows = false;
//modify positioning
matrix.Location = new Point(10, 20);
//matrix.Anchor = (AnchorStyles)(AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Right);
matrix.Dock = DockStyle.Fill;
//set the size of the matrix
matrix.ColumnCount = col;
matrix.RowCount = row;


//Data now inserted...
matrix.AutoResizeColumns(); //correctly resizes the columns

int height = 0;
foreach (DataGridViewRow row in matrix.Rows)
{
    height += row.Height;
}
height += matrix.ColumnHeadersHeight;

int width = 0;
foreach (DataGridViewColumn col in matrix.Columns)
{
    width += col.Width;
    //PROBLEM: Width always  = 100 pixels.
}
width += matrix.RowHeadersWidth;
//width = 90; //override width manually
matrix.Size = new Size(width + 2, height + 2);
panel.Size = new Size(matrix.Width, matrix.Height);

screenshot

面板太大了，因为宽度不是90px而是大致357，这是错误的！

编辑：PARTIAL FIX 我找到了一种获得正确宽度的方法：

DataGridView.Rows[0].Cells[0].ContentBounds.Width
//ContentBounds = a rectangle with the exact dimensions of that cell

我现在可以将DataGridView设置为正确的大小，但前提是它没有停靠到Fill。设置matrix.Dock = DockStyle.Fill可以防止调整大小正确发生。

Answer 1

我想这是因为您要在行中自动调整列：

matrix.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;

尝试将其更改为：

matrix.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;

Answer 2

我已经弄清楚问题是什么：

DataGridView.Dock = DockStyle.Fill阻止了DataGridView.AutoResizeColumns（）方法做任何事情。
Rectangle rect = matrix.Rows [0] .ContentBounds获取包含单元格值的矩形的尺寸在AutoResizeColumns（）
我尝试手动设置列，但建议 heq 时，必须将AutoSizeColumnsMode设置为None才能修改宽度。
我手动调整了每列的宽度，对于单元格内的每个字符都是10px

最终解决方案

/* Create the DataGridView */
matrix = new DataGridView();
//modify behaviour
matrix.ColumnHeadersVisible = false;
// matrix.columnhea
matrix.AllowUserToResizeColumns = false;
matrix.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;
matrix.RowHeadersVisible = false;
matrix.AllowUserToResizeRows = false;
matrix.ReadOnly = true;
//modify positioning
matrix.Location = new Point(10, 20);
//matrix.Dock = DockStyle.Fill;
matrix.Anchor = (AnchorStyles)(AnchorStyles.Left | AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Right);
//set the size of the matrix
matrix.ColumnCount = cols;
matrix.RowCount = rows;

panel.Controls.Add(matrix);

/* Set the data contents (not shown) */
...

/* Adjust the width of columns */
int width = 0;
int height = 0;

for(int c = 0; c < cols; c++) 
{
  int largest = 0; //largest number of characters in cell
  for(int r = 0; r < rows; r++) 
  {
      int len = matrix.Rows[r].Cells[c].Value.ToString().Length;
      if (len > largest)
      {
          largest = len;
      }
  }
  matrix.Columns[c].Width = largest * 10;
  width += largest * 10;
}

/* Get height of table */
foreach (DataGridViewRow row in matrix.Rows)
{
    height += row.Height;
}

/* Set the DataGridView Size and Parent Panel size */
//Note: first set the parent panel width, the table is anchored to all of its edges
// as such table wont resize correctly if the panel isn't up to size first
panel.Size = new Size(width + 20, height + 30);
matrix.Size = new Size(width + 3, height + 3); //is it 1px per row and col?

/* Parent Panel settings kept to default, no modifications */

得到实际的列宽

2 个答案: