【机房重构】——Excel导出

首先，我们应该先添加一个引用在UI里。

 这个方法有可能被多次用到，所以把它封装在一个类里边，方便调用。

using System.Windows.Forms;//添加引用窗体
using Excel = Microsoft.Office.Interop.Excel;
using System.Data.OleDb;

namespace UI
{
    public class ToExcel
    {
        public void RExcel(DataGridView dgv)
        {
            if (dgv.Rows.Count == 0)
            {
                MessageBox.Show("没有数据");
                return;
            }
            
            string fileName = "";
            string saveFileName = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xlsx";
            saveDialog.Filter = "Excel文件|*.xlsx";
            saveDialog.FileName = fileName;
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < 0) return;//被点了取消
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，您的电脑可能未安装Excel");
                return;
            }
            Microsoft.Office.Interop.Excel.Workbooks workbooks=xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet= (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
            //写入标题
            for (int i = 0; i < dgv.ColumnCount; i++)
            {
                worksheet.Cells[1, i + 1] = dgv.Columns[i].HeaderText;
            }
            //写入数值
            for (int r = 0; r < dgv.Rows.Count; r++)
            {
                for (int j = 0; j < dgv.ColumnCount; j++)
                {
                    worksheet.Cells[r + 2, j + 1] = dgv.Rows[r].Cells[j].Value;
                }
                System.Windows.Forms.Application.DoEvents();
            }
            worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
            MessageBox.Show(fileName + "资料保存成功", "提示", MessageBoxButtons.OK);
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);
                }
                catch(Exception ex)
                {
                    MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                }
            }
            xlApp.Quit();
            GC.Collect();//强行销毁
        }
    }
}

真正调用的时候，用以下代码。

        private void btnExcel_Click(object sender, EventArgs e)
        {
            ToExcel frm = new ToExcel();
            frm.RExcel(dataGridView1);
        }