c# - 如何向datagridview添加过滤器

Question

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

怎么办？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 column = new DataGridViewTextBoxColumn();
                column.Name = cellValue[i];    //column name , value
                column.HeaderText = cellValue[i];
                dataGridView1.Columns.Add(column);
                // dataGridView1.Columns[].CellType = typeof(Int64);
                //Conver.ToString
                dataGridView1.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter; // Korean? 칼럼 헤더 가운데 정렬
             //   dataGridView1.RowHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
               // dataGridView1.Columns[0].DataPropertyName = "field name";
            }
            while (fileReader.Peek() != -1)
            {
                rowValue = fileReader.ReadLine();
                cellValue = rowValue.Split(',');
                dataGridView1.Rows.Add(cellValue);
            }
            fileReader.Dispose();
            fileReader.Close();`

Answer 1

而不是直接将行添加到 DataGridView将它们添加到 DataTable然后将该表设置为 DataGridView 的 DataSource，然后使用 table.DefaultView.RowFilter 过滤 DataGridView.

您可以使用以下示例简单地更改您的代码。

创建数据表:

var table = new DataTable();

向 DataTable 添加列:

table.Columns.Add("column name");

向数据表添加行:

要使用范围添加行，例如 string[]:

table.Rows.Add(range);

将表格设置为DataGridview的DataSource

dataGridView1.DataSource = table;

使用数据表过滤:

要使用数据表进行过滤，例如仅显示 FirstName 为 John 的行:

((DataTable)dataGridView1.DataSource).DefaultView.RowFilter = "FirstName = 'John'"; 

了解更多:

• Creating a DataTable
• Adding Columns to a DataTable
• Adding Data to a DataTable
• DataView.RowFilter和 Filter Expression .