C#读取Excel以及将数据导入至Excel

版权声明： https://blog.csdn.net/Bibabu135766/article/details/79566675

一，读取Excel文件内容：

//根据excle的路径把第一个sheel中的内容放入datatable
    public static DataTable ReadExcelToTable()//excel存放的路径
    {
        //连接字符串
        string connstring = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + "E:/Peng.Tao/TEST/1.xlsx" + ";Extended Properties='Excel8.0;HDR=NO;IMEX=1';"; // Office 07及以上版本 不能出现多余的空格 而且分号注意
        //string connstring = Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + path + ";Extended Properties='Excel 8.0;HDR=NO;IMEX=1';"; //Office 07以下版本 
        using (OleDbConnection conn = new OleDbConnection(connstring))
        {
            conn.Open();
            DataTable sheetsName = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] { null, null, null, "Table" }); //得到所有sheet的名字
            string firstSheetName = sheetsName.Rows[0][2].ToString(); //得到第一个sheet的名字
            string sql = string.Format("SELECT * FROM [{0}]", firstSheetName); //查询字符串
            //string sql = string.Format("SELECT * FROM [{0}] WHERE [日期] is not null", firstSheetName); //查询字符串
            OleDbDataAdapter ada = new OleDbDataAdapter(sql, connstring);
            DataSet set = new DataSet();
            ada.Fill(set);
            return set.Tables[0];
        }
    } 

二，将数据导入至Excel:

protected void Excel1_Click(object sender, EventArgs e) {
        //设置保存的文档类型
        //Response.ContentType = "application/ms-word";//保存为Word类型  
        Response.ContentType = "application/ms-excel";//保存为Excel类型
        //设置编码方式和内容保存的形式
        Response.ContentEncoding = System.Text.Encoding.UTF8;
        Response.Charset = "Excel文档";
        //设置保存为的文件名
        string dateStr = DateTime.Now.ToString("yyyyMMddHHmmss");
        string fileName = System.Web.HttpUtility.UrlEncode("料号文件" + dateStr, System.Text.Encoding.UTF8);
        Response.AppendHeader("content-disposition", "attachment;filename=\"" + fileName + ".xls\"");
        //开始导出;
        this.EnableViewState = false;
        StringWriter oStringWriter = new StringWriter();
        HtmlTextWriter oHtmlTextWriter = new HtmlTextWriter(oStringWriter);
        GridView1.RenderControl(oHtmlTextWriter);
        Response.Write(oStringWriter.ToString());
        oStringWriter = new StringWriter();
        oHtmlTextWriter = new HtmlTextWriter(oStringWriter);
        GridView1.RenderControl(oHtmlTextWriter);
        Response.Write(oStringWriter.ToString());
        Response.End();   
    }
	//添加以下函数防止出现:“Gridview控件需在Runat=server中”  的异常
    public override void VerifyRenderingInServerForm(Control control)
    {
        //base.VerifyRenderingInServerForm(control);
    }

三，WinForm将DataGridView数据导出至EXCEL

private void button2_Click(object sender, EventArgs e)
        {
            ToExcel();            
        }
        public void ToExcel()
        {
            try
            {
                //没有数据的话就不往下执行  
                if (dataGridView1.Rows.Count == 0)
                    return;
                //实例化一个Excel.Application对象  
                Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
                //让后台执行设置为不可见，为true的话会看到打开一个Excel，然后数据在往里写  
                excel.Visible = true;
                //新增加一个工作簿，Workbook是直接保存，不会弹出保存对话框，加上Application会弹出保存对话框，值为false会报错  
                excel.Application.Workbooks.Add(true);
                //生成Excel中列头名称  
                for (int i = 0; i < dataGridView1.Columns.Count; i++)
                {
                    if (this.dataGridView1.Columns[i].Visible == true)
                    {
                        excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;
                    }

                }
                //把DataGridView当前页的数据保存在Excel中  
                for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
                {
                    System.Windows.Forms.Application.DoEvents();
                    for (int j = 0; j < dataGridView1.Columns.Count; j++)
                    {
                        if (this.dataGridView1.Columns[j].Visible == true)
                        {
                            if (dataGridView1[j, i].ValueType == typeof(string))
                            {
                                excel.Cells[i + 2, j + 1] = "'" + dataGridView1[j, i].Value.ToString();
                            }
                            else
                            {
                                excel.Cells[i + 2, j + 1] = dataGridView1[j, i].Value.ToString();
                            }
                        }

                    }
                }
                //设置禁止弹出保存和覆盖的询问提示框  
                excel.DisplayAlerts = false;
                excel.AlertBeforeOverwriting = false;
                //保存工作簿  
                excel.Application.Workbooks.Add(true).Save();
                //保存excel文件  
                excel.Save("E:\\Peng.Tao\\Winform\\MyFirstWinform" + "\\Data.xls");
                //确保Excel进程关闭  
                excel.Quit();
                excel = null;
                GC.Collect();//如果不使用这条语句会导致excel进程无法正常退出，使用后正常退出
                MessageBox.Show(this, "文件已经成功导出！", "信息提示");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "错误提示");
            }
        }