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我正在尝试将csv文件加载到datagridview,现在我想向datagridview添加过滤

怎么做？这是我读取和加载csv文件的方式

openFileDialog1.InitialDirectory = @"C:\";
openFileDialog1.Title = "Open CSV Files";
openFileDialog1.CheckFileExists = true;
openFileDialog1.CheckPathExists = true;
openFileDialog1.DefaultExt = "CSV";
openFileDialog1.Filter = "CSV files (*.csv)|*.csv|All files(*.*)|*.*";
openFileDialog1.FilterIndex = 1;
openFileDialog1.RestoreDirectory = true;
try
{
    if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        string csvPath = openFileDialog1.FileName;
        string rowValue;
        // int rowValue = int.Parse(??);
        string[] cellValue;
        dataGridView1.Rows.Clear();
        //dataGridView1.Columns.Clear();
        if (System.IO.File.Exists(csvPath))
        {
            System.IO.StreamReader fileReader = new StreamReader(csvPath);
            rowValue = fileReader.ReadLine();
            cellValue = rowValue.Split(',');



            for (int i = 0; i <= cellValue.Count() - 1; i++)
            {
                DataGridViewTextBoxColumn …

我用 C# 制作了一个 DataGradView，它允许我折叠和展开行。看起来像这样：

在启动时，我想折叠具有多个条目的所有客户。就像图中所示的那样。customers is < 10.000 如果总数需要customer is > 10.000几分钟才能完成，效果很好。

折叠所有客户的代码：

   int number = 0;
        int oldnumber = 0;
        int parent = 0;

        foreach (CustomDataGridViewRow row in dataGridView1.Rows)
        {
            try
            {
                number = int.Parse(row.Cells[1].Value.ToString());

                if (number != oldnumber && int.Parse(dataGridView1.Rows[row.Index + 1].Cells[1].Value.ToString()) == number)
                {
                    row.Is_expander = true;
                    parent = row.Index;

                }
                if (number == oldnumber)
                {
                    row.hide(parent);
                }
                oldnumber = number;
            }
            catch { }
        }

我调用了必须折叠的 foreach 行row.hide(parent)，它将可见性设置为 false 并保存父索引。

对于每个父行将绘制一个图标 …