在 DataGridView 的行标题中显示行号

Question

是否可以在DataGridView的行标题中显示行号？

我正在尝试使用此代码，但它不起作用：

    private void setRowNumber(DataGridView dgv)
    {
        foreach (DataGridViewRow row in dgv.Rows)
        {
            row.HeaderCell.Value = row.Index + 1;
        }
    }

我是否必须设置一些DataGridView属性？

Answer 1

您还可以在RowPostPaint事件中动态绘制字符串：

private void dgGrid_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
    var grid = sender as DataGridView;
    var rowIdx = (e.RowIndex + 1).ToString();

    var centerFormat = new StringFormat() 
    { 
        // right alignment might actually make more sense for numbers
        Alignment = StringAlignment.Center, 
        LineAlignment = StringAlignment.Center
    };

    var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth, e.RowBounds.Height);
    e.Graphics.DrawString(rowIdx, this.Font, SystemBrushes.ControlText, headerBounds, centerFormat);
}

Answer 2

似乎它没有把它变成一个字符串。 尝试

row.HeaderCell.Value = String.Format("{0}", row.Index + 1);

Answer 3

谢谢@Gabriel-Perez 和@Groo，好主意！ 如果其他人需要它，这里有一个在 Visual Studio 2012 中测试过的 VB 版本。在我的情况下，我希望数字在行标题中显示为右上角对齐。

Private Sub MyDGV_RowPostPaint(sender As Object, _
    e As DataGridViewRowPostPaintEventArgs) Handles MyDataGridView.RowPostPaint

    ' Automatically maintains a Row Header Index Number 
    '   like the Excel row number, independent of sort order

    Dim grid As DataGridView = CType(sender, DataGridView)
    Dim rowIdx As String = (e.RowIndex + 1).ToString()
    Dim rowFont As New System.Drawing.Font("Tahoma", 8.0!, _
        System.Drawing.FontStyle.Bold, _
        System.Drawing.GraphicsUnit.Point, CType(0, Byte))

    Dim centerFormat = New StringFormat()
    centerFormat.Alignment = StringAlignment.Far
    centerFormat.LineAlignment = StringAlignment.Near

    Dim headerBounds As Rectangle = New Rectangle(_
        e.RowBounds.Left, e.RowBounds.Top, _
        grid.RowHeadersWidth, e.RowBounds.Height)
    e.Graphics.DrawString(rowIdx, rowFont, SystemBrushes.ControlText, _
        headerBounds, centerFormat)
End Sub

您还可以获得默认字体rowFont = grid.RowHeadersDefaultCellStyle.Font ，但它可能看起来不那么好。 下面的屏幕截图使用的是 Tahoma 字体。

Answer 4

private void setRowNumber(DataGridView dgv)
{
    foreach (DataGridViewRow row in dgv.Rows)
    {
        row.HeaderCell.Value = (row.Index + 1).ToString();
    }
}

这对我有用。

Answer 5

只是增强上述解决方案.. 所以标题它会自动调整其宽度以适应像 12345 这样的长字符串

private void advancedDataGridView1_RowPostPaint(object sender, DataGridViewRowPostPaintEventArgs e)
{
    var grid = sender as DataGridView;
    var rowIdx = (e.RowIndex + 1).ToString();

    var centerFormat = new StringFormat()
    {
        // right alignment might actually make more sense for numbers
        Alignment = StringAlignment.Center,

        LineAlignment = StringAlignment.Center
    };
    //get the size of the string
    Size textSize = TextRenderer.MeasureText(rowIdx, this.Font);
    //if header width lower then string width then resize
    if (grid.RowHeadersWidth < textSize.Width + 40)
    {
        grid.RowHeadersWidth = textSize.Width + 40;
    }
    var headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth, e.RowBounds.Height);
    e.Graphics.DrawString(rowIdx, this.Font, SystemBrushes.ControlText, headerBounds, centerFormat);
}

Answer 6

你可以这样做 ：

private void setRowNumber(DataGridView dgv)
{
    foreach (DataGridViewRow row in dgv.Rows)
    {
        row.HeaderCell.Value = row.Index + 1;
    }

    dgv.AutoResizeRowHeadersWidth(DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders);

}

Answer 7

row.HeaderCell.Value = row.Index + 1;

当应用于具有大量行的 datagridview 时，会导致内存泄漏并最终导致内存不足问题。 任何想法如何回收内存？

这是应用于具有某些列的空网格的示例代码。 它只是添加行并为索引编号。 重复按钮点击几次。

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        dataGridView1.SuspendLayout();
        for (int i = 1; i < 10000; i++)
        {
            dataGridView1.Rows.Add(i);                
        }
        dataGridView1.ResumeLayout();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        foreach (DataGridViewRow row in dataGridView1.Rows)
            row.HeaderCell.Value = (row.Index + 1).ToString();
    }
}

Answer 8

这对我有用。

Private Sub GridView1_CellFormatting(sender As Object, e As DataGridViewCellFormattingEventArgs) Handles GridView1.CellFormatting
    Dim idx As Integer = e.RowIndex
    Dim row As DataGridViewRow = VDataGridView1.Rows(idx)
    Dim newNo As Long = idx
    If Not _RowNumberStartFromZero Then
        newNo += 1
    End If

    Dim oldNo As Long = -1
    If row.HeaderCell.Value IsNot Nothing Then
        If IsNumeric(row.HeaderCell.Value) Then
            oldNo = CLng(row.HeaderCell.Value)
        End If
    End If

    If newNo <> oldNo Then 'only change if it's wrong or not set
        row.HeaderCell.Value = newNo.ToString()
        row.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight
    End If
End Sub

Answer 9

这项工作在C# 中：

private void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    int idx = e.RowIndex;
    DataGridViewRow row = dataGridView1.Rows[idx];
    long newNo = idx;
    if (!_RowNumberStartFromZero)
        newNo += 1;

    long oldNo = -1;
    if (row.HeaderCell.Value != null)
    {
        if (IsNumeric(row.HeaderCell.Value))
        {
            oldNo = System.Convert.ToInt64(row.HeaderCell.Value);
        }
    }

    if (newNo != oldNo)
    {
        row.HeaderCell.Value = newNo.ToString();
        row.HeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleRight;
    }
}

Answer 10

private void ShowRowNumber(DataGridView dataGridView)
{
   dataGridView.RowHeadersWidth = 50;
   for (int i = 0; i < dataGridView.Rows.Count; i++)
   {
        dataGridView.Rows[i].HeaderCell.Value = (i + 1).ToString();
   }
}

Answer 11

基于此视频： VB.net-Auto 在 windows application-winforms 中为 datagridview 生成行号，您可以设置 DataSource 并且此代码放置行号，就像一个魅力。

private void DataGrid_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    // Add row number
    (sender as DataGridView).Rows[e.RowIndex].HeaderCell.Value = (e.RowIndex+1).ToString();
}

Answer 12

Private Sub DataGridView1_RowPostPaint(sender As Object, e As DataGridViewRowPostPaintEventArgs) Handles DataGridView1.RowPostPaint
        Dim rowIdx = (e.RowIndex + 1).ToString()
        Dim centerFormat = New StringFormat With {.Alignment = StringAlignment.Center, .LineAlignment = StringAlignment.Center}
        Dim textSize As Size = TextRenderer.MeasureText(rowIdx, sender.Font)
        If (sender.RowHeadersWidth < textSize.Width + 35) Then
            sender.RowHeadersWidth = textSize.Width + 35
        End If
        Dim headerBounds = New Rectangle(e.RowBounds.Left, e.RowBounds.Top, sender.RowHeadersWidth, e.RowBounds.Height)
        e.Graphics.DrawString(rowIdx, sender.Font, SystemBrushes.ControlText, headerBounds, centerFormat)
End Sub