c#快速导出到excel

导出到Excel,基本是很多单据的标配功能了。笔者之前将Datagridview的数据导出到Excel时,将数据一个单元格一个单元格的写入,效率奇慢,

1030条数据花费了将近70s的时间。后来借鉴了前辈们的其它写法,将数据先生成到string变量,再写入,效率提升了150多倍。分享如下:

1、改善后结果:

2、导出到Excel使用的方法:

简要说明:

TableName:数据源数据表

FileName:要保存的Excel文件名

lblStatus:ToolStripStatusLable

barStatus:ToolStripProgressBar

引用及代码:

using System.IO;
using System.Data.SqlClient;
using System.Threading;
using System.Diagnostics;
public void ExportDataToExcel(DataTable TableName, string FileName)
        {
            SaveFileDialog saveFileDialog = new SaveFileDialog();
            //设置文件标题
            saveFileDialog.Title = "导出Excel文件";
            //设置文件类型
            saveFileDialog.Filter = "Microsoft Office Excel 工作簿(*.xls)|*.xls";
            //设置默认文件类型显示顺序  
            saveFileDialog.FilterIndex = 1;
            //是否自动在文件名中添加扩展名
            saveFileDialog.AddExtension = true;
            //是否记忆上次打开的目录
            saveFileDialog.RestoreDirectory = true;
            //设置默认文件名
            saveFileDialog.FileName = FileName;
            //按下确定选择的按钮  
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                //获得文件路径 
                string localFilePath = saveFileDialog.FileName.ToString();

                //数据初始化
                int TotalCount;     //总行数
                int RowRead = 0;    //已读行数
                int Percent = 0;    //百分比

                TotalCount = TableName.Rows.Count;
                lblStatus.Text = "共有" + TotalCount + "条数据";
                lblStatus.Visible = true;
                barStatus.Visible = true;

                //数据流
                Stream myStream = saveFileDialog.OpenFile();
                StreamWriter sw = new StreamWriter(myStream, Encoding.GetEncoding("gb2312"));
                string strHeader = "";

                //秒钟
                Stopwatch timer = new Stopwatch();
                timer.Start();

                try
                {
                    //写入标题
                    for (int i = 0; i < TableName.Columns.Count; i++)
                    {
                        if (i > 0)
                        {
                            strHeader += "\t";
                        }
                        strHeader += TableName.Columns[i].ColumnName.ToString();
                    }
                    sw.WriteLine(strHeader);

                    //写入数据
                    //string strData;
                    for (int i = 0; i < TableName.Rows.Count; i++)
                    {
                        RowRead++;
                        Percent = (int)(100 * RowRead / TotalCount);
                        barStatus.Maximum = TotalCount;
                        barStatus.Value = RowRead;
                        lblStatus.Text = "共有" + TotalCount + "条数据,已写入" + Percent.ToString() + "%的数据,共耗时" + timer.ElapsedMilliseconds + "毫秒。";
                        Application.DoEvents();

                        string strData = "";
                        for (int j = 0; j < TableName.Columns.Count; j++)
                        {
                            if (j > 0)
                            {
                                strData += "\t";
                            }
                            strData += TableName.Rows[i][j].ToString();
                        }
                        sw.WriteLine(strData);
                    }
                    //关闭数据流
                    sw.Close();
                    myStream.Close();
                    //关闭秒钟
                    timer.Reset();
                    timer.Stop();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
                finally
                {
                    //关闭数据流
                    sw.Close();
                    myStream.Close();
                    //关闭秒钟
                    timer.Stop();
                }

                //成功提示
                if (MessageBox.Show("导出成功,是否立即打开?", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
                {
                    System.Diagnostics.Process.Start(localFilePath);
                }

                //赋初始值
                lblStatus.Visible = false;
                barStatus.Visible = false;
            }
        }

后记:

美中不足的是,上述代码仅能导出到xls格式,若需导出到xlsx格式的话,仍需调整代码。 

posted on 2018-01-24 09:13 缥缈的尘埃 阅读(...) 评论(...) 编辑 收藏

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