C#中导出百万级Excel只需几秒除了NPOI还可以这样

场景

Winform中通过NPOI导出Excel的三种方式(HSSFWorkbook，XSSFWorkbook，SXSSFWorkbook)附代码下载：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/106423452

之前在使用NPOI进行导出Excel时遇到百万级别的可以采用SXSSFWorkbook的方式。

但是速度还是很慢。但是有点是导出的是严格意义上的Excel，即可以设置正常的多sheet页以及能设置每个Cell的格式等。

但是如果数据量很大只求能导出数据作为备份，不对格式等有严格的要求，可以采用文件流的方式快速导出。

注：

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实现

为了能构建导出的数据，首先新建一个对象类

    public class DataItem
    {
 
        public int Age { get; set; }
 
 
        public string Name { get; set; }
 
 
        public string Address { get; set; }
 
        public int Sex { get; set; }
 
        public DateTime Birth { get; set; }
 
    }

然后进入此页面的代码中，先构建一部分导出的数据。

        //数据
        List<DataItem> ItemList = new List<DataItem>()
        {
            new DataItem() {Name = "霸道",Age = 24,Address = "中国",Sex = 1,Birth = DateTime.Now},
            new DataItem() {Name = "流氓",Age = 25,Address = "北京",Sex = 0,Birth = DateTime.Now},
            new DataItem() {Name = "气质",Age = 26,Address = "上海",Sex = 0,Birth = DateTime.Now},
            new DataItem() {Name = "程序猿",Age = 27,Address = "青岛",Sex = 1,Birth = DateTime.Now},
        };

然后在按钮的点击事件中

private void button6_Click(object sender, EventArgs e)
        {
            try
            {
                //要导出的csv文件的存放位置
                string fullPath = System.IO.Path.Combine(@"D:\", "badao.xls");
                FileInfo fi = new FileInfo(fullPath);
                if (!fi.Directory.Exists)
                {
                    fi.Directory.Create();
                }
                FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);
                StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
                StringBuilder data = new StringBuilder();
 
                //写出列名称-第一行
                data.Append("姓名,年龄,地址,性别,生日");
                //换行
                sw.WriteLine(data);
 
                //构建大数据量
                List<DataItem> bigData = new List<DataItem>();
                for (int i = 0; i < 1000000; i++)
                {
                    DataItem item = new DataItem();
                    item.Name = "霸道" + i;
                    item.Age = i;
                    item.Address = "青岛" + i;
                    item.Sex = i;
                    item.Birth = DateTime.Now;
                    bigData.Add(item);
 
                }
 

 
                //写出各行数据
                foreach (DataItem item in bigData)
                {
 
                    data = new StringBuilder();
 
                    data.Append(item.Name);
                    data.Append(",");
                    data.Append(item.Age);
                    data.Append(",");
                    data.Append(item.Address);
                    data.Append(",");
                    data.Append(item.Sex);
                    data.Append(",");
                    data.Append(item.Birth);
                    data.Append(",");
                    //换行
                    sw.WriteLine(data);
 
                }
                //关闭
                sw.Close();
                fs.Close();
                MessageBox.Show("导出成功");
            }
            catch (Exception ex)
            {
                Console.Write(ex);
                MessageBox.Show("导出失败:"+ex);
            }
           
        }

但是这样导出的数据在使用Excel打开时会有提示，点击是就能打开

 

点击是后正常打开