Vij*_*ade 17 c# performance datagridview
我正在使用BindingSource控件来填充datagridview控件.它上面有大约1000多条记录.我正在使用线程来这样做.在这种情况下,datagridview执行速度非常慢.
我尝试将DoubleBuffered属性设置为true,将RowHeadersWidthSizeMode设置为禁用,将AutoSizeColumnsMode设置为none.但仍然是相同的行为.
请帮助我.如何提高网格的性能.
在此先感谢,
Vijay
oka*_*pov 26
如果你有大量的行,比如10 000或更多,
避免性能泄漏 - 在数据绑定之前执行以下操作:
dataGridView1.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.EnableResizing;
// or even better, use .DisableResizing. Most time consuming enum is DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders
// set it to false if not needed
dataGridView1.RowHeadersVisible = false;
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数据绑定后,您可以启用它.
sau*_*tel 13
确保你不自动调整列,它可以提高性能.
即不要这样做Datagridview.Columns [I] .AutoSizeMode = DataGridViewAutoSizeColumnMode.xxxxx;
通常关闭自动调整大小和双缓冲有助于加速DataGridView填充.检查DGV双缓冲是否正确打开:
if (!System.Windows.Forms.SystemInformation.TerminalServerSession)
{
Type dgvType = dataGridView1.GetType();
PropertyInfo pi = dgvType.GetProperty("DoubleBuffered",
BindingFlags.Instance | BindingFlags.NonPublic);
pi.SetValue(dataGridView1, value, null);
}
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使用WinAPI WM_SETREDRAW消息禁用重绘也有助于:
// *** API Declarations ***
[DllImport("user32.dll")]
private static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);
private const int WM_SETREDRAW = 11;
// *** DataGridView population ***
SendMessage(dataGridView1.Handle, WM_SETREDRAW, false, 0);
// Add rows to DGV here
SendMessage(dataGridView1.Handle, WM_SETREDRAW, true, 0);
dataGridView1.Refresh();
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如果您不需要双向数据绑定或BindingSource提供的某些功能(过滤等),您可以考虑使用DataGridView.Rows.AddRange()方法一次添加行.
链接到源文章的示例:http://10tec.com/articles/why-datagridview-slow.aspx
我必须在一些地方禁用自动调整大小才能看到性能的最大改进。就我而言,我为AutoSizeRowsMode、AutoSizeColumnsMode和启用了自动调整大小模式ColumnHeadersHeightSizeMode。因此,在将数据绑定到以下之前,我必须禁用其中的每一个DataGridView:
dataGridView.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.None;
dataGridView.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;
dataGridView.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
// ... Bind the data here ...
// Set the DataGridView auto-size modes back to their original settings.
dataGridView.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.AllCells;
dataGridView.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
dataGridView.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.AutoSize;
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我知道我参加聚会的时间很晚,但是最近我对DataGridView控件的自动调整大小太慢感到厌烦,并且觉得有人可能会从我的解决方案中受益。
我创建了这种扩展方法,用于手动测量和调整DataGridView中的列的大小。将AutoSizeColumnsMode设置为DataGridViewAutoSizeColumnsMode.None并在设置DataSource后调用此方法。
/// <summary>
/// Provides very fast and basic column sizing for large data sets.
/// </summary>
public static void FastAutoSizeColumns(this DataGridView targetGrid)
{
// Cast out a DataTable from the target grid datasource.
// We need to iterate through all the data in the grid and a DataTable supports enumeration.
var gridTable = (DataTable)targetGrid.DataSource;
// Create a graphics object from the target grid. Used for measuring text size.
using (var gfx = targetGrid.CreateGraphics())
{
// Iterate through the columns.
for (int i = 0; i < gridTable.Columns.Count; i++)
{
// Leverage Linq enumerator to rapidly collect all the rows into a string array, making sure to exclude null values.
string[] colStringCollection = gridTable.AsEnumerable().Where(r => r.Field<object>(i) != null).Select(r => r.Field<object>(i).ToString()).ToArray();
// Sort the string array by string lengths.
colStringCollection = colStringCollection.OrderBy((x) => x.Length).ToArray();
// Get the last and longest string in the array.
string longestColString = colStringCollection.Last();
// Use the graphics object to measure the string size.
var colWidth = gfx.MeasureString(longestColString, targetGrid.Font);
// If the calculated width is larger than the column header width, set the new column width.
if (colWidth.Width > targetGrid.Columns[i].HeaderCell.Size.Width)
{
targetGrid.Columns[i].Width = (int)colWidth.Width;
}
else // Otherwise, set the column width to the header width.
{
targetGrid.Columns[i].Width = targetGrid.Columns[i].HeaderCell.Size.Width;
}
}
}
}
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虽然我当然不建议使用1000多个行来填充DGV,但是这种方法在产生与AutoResizeColumns方法非常相似的结果的同时,还能带来巨大的性能优势。
对于1万行:(1万行* 12列。)
AutoResizeColumns = 〜3000毫秒
FastAutoSizeColumns = 〜140毫秒
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