Question

此代码从datagridview导出csv文件。当导出的数据大于1k列和10k行时，偶尔会出现内存使用问题即使在代码中使用了dispose（）和flush（），任务管理器上的内存使用量也会增加我真正想要的是在CSV文件中添加一行并刷新内存。每次添加一行并刷新内存我怎么解决这个问题？我已经使用过GC而没有改变结果。

private void export_csv_file()
    {
        SaveFileDialog dialog = new SaveFileDialog();
        dialog.Filter = "csv file (*.csv)|*.csv";
        dialog.FileName = DateTime.Now.ToString("yyyy-MM-dd_HHmmss") + "_R";

        String csvFile;
        if (dialog.ShowDialog() == DialogResult.OK)
        {
            csvFile = dialog.FileName;
            StreamWriter sw_column = new StreamWriter(File.Open(csvFile, FileMode.Create), Encoding.Default);
            // write columns to csv file
            //m_gridView has a datatable
            foreach (DataGridViewColumn col in m_gridView.Columns)
            {
                sw_column.Write(col.Name + ",");
            }
            sw_column.Write("\r\n");
            sw_column.Dispose();
            sw_column.Close();

            foreach (DataGridViewRow row in m_gridView.Rows)
            {
                StreamWriter sw_row = new StreamWriter(File.Open(csvFile, FileMode.Append), Encoding.Default);

                foreach (DataGridViewCell cell in row.Cells)
                {
                    sw_row.Write(cell.Value + ",");
                }

                sw_row.Write("\r\n");
                sw_row.Dispose();
                sw_row.Close();
            }

            Thread.Sleep(500);
            this.Activate();
        }
        dialog.Dispose();
    }

Answer 1

尝试使用这种格式重构代码，尽管@Jeroen van Langen指出，问题可能在于您使用数据源的方式

更新：因为您指出首先将数据加载到 DataTable ...

DataTable dt = new DataTable(); //Your datasource
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "csv file (*.csv)|*.csv";
sfd.FileName = DateTime.Now.ToString("yyyy-MM-dd_HHmmss") + "_R";

if (sfd.ShowDialog() == DialogResult.OK)
{
    using (StreamWriter sw = new StreamWriter(sfd.FileName))
    {
        //Add Column Headers
        sw.Write(string.Join(",", dt.Columns.Cast<DataColumn>().Select(c => c.ColumnName)));
        sw.Write(",\r\n");

        //Add Rows
        foreach (var row in dt.AsEnumerable().Select(r => r.ItemArray.Cast<string>()))
        {
            sw.Write(string.Join(",", row));
            sw.Write(",\r\n");
        }
    }
}

C＃如何清除内存使用情况？

1 个答案: