更快捷地将csv读取到网格

Question

我在Windows Forms .NET 3.5中有以下内容

它适用于记录小于10,000的csv,但对于30,000以上的记录则较慢.输入csv文件可以在1到1,00,000条记录之间进行任何记录

目前使用的代码:

/// <summary>
        /// This will import file to the collection object
        /// </summary>
        private bool ImportFile()
        {
            try
            {

                String fName;
                String textLine = string.Empty;
                String[] splitLine;

                // clear the grid view

                accountsDataGridView.Rows.Clear();

                fName = openFileDialog1.FileName;

                if (System.IO.File.Exists(fName))
                {
                    System.IO.StreamReader objReader = new System.IO.StreamReader(fName);

                    do
                    {
                        textLine = objReader.ReadLine();
                        if (textLine != "")
                        {
                            splitLine = textLine.Split(',');
                            if (splitLine[0] != "" || splitLine[1] != "")
                            {
                                accountsDataGridView.Rows.Add(splitLine);
                            }
                        }
                    } while (objReader.Peek() != -1);
                }
                return true;
            }
            catch (Exception ex)
            {
                if (ex.Message.Contains("The process cannot access the file"))
                {
                    MessageBox.Show("The file you are importing is open.", "Import Account", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
                else
                {
                    MessageBox.Show(ex.Message);
                }

                return false;
            }

        }

样本输入文件:
18906,Y
18908,Y
18909,Y
18910,Y
18912,N
18913,N

需要一些关于优化此代码的建议,以便在网格中快速读取和查看.

Answer 1

List<string[]> rows = File.ReadAllLines("Path").Select(x => x.Split(',')).ToList();
DataTable dt = new DataTable();
dt.Columns.Add("1");
dt.Columns.Add("2");
rows.ForEach(x => {
  dt.Rows.Add(x);
});
dgv.DataSource = dt;

试试看,我怀疑你在数据网格中有某种形式的列名,现在我只做了1和2.

要根据原始代码进行过滤,请使用:

List<string[]> rows = File.ReadAllines("Path").Select(x => x.Split(',')).Where(x => x[0] != "" && x[1] != "").ToList();

从列表中获取列 DataGridView

  dt.Columns.AddRange(dgv.Columns.Cast<DataGridViewColumn>().Select(x => new DataColumn(x.Name)).ToArray());