WPF-将DataGrid控件中的数据导出到Excel

　　导出至Excel是非常常见，我们可以用很多类库，例如Aspose、NOPI、Interop，在这里我们使用微软自家的工具。我的WPF绑定的ObservableCollection集合。

        public string ExcelExport(System.Data.DataTable DT, string title)
        {
            try
            {
                //创建Excel
                Microsoft.Office.Interop.Excel.Application ExcelApp = new Microsoft.Office.Interop.Excel.Application();
                Microsoft.Office.Interop.Excel.Workbook ExcelBook = ExcelApp.Workbooks.Add(System.Type.Missing);
                //创建工作表（即Excel里的子表sheet） 1表示在子表sheet1里进行数据导出
                Microsoft.Office.Interop.Excel.Worksheet ExcelSheet = (Microsoft.Office.Interop.Excel.Worksheet)ExcelBook.Worksheets[1];
                //如果数据中存在数字类型 可以让它变文本格式显示
                ExcelSheet.Cells.NumberFormat = "@";
                //设置工作表名
                ExcelSheet.Name = title;
                //设置Sheet标题
                string start = "A1";
                string end = ChangeASC(DT.Columns.Count) + "1";
                Microsoft.Office.Interop.Excel.Range _Range = (Microsoft.Office.Interop.Excel.Range)ExcelSheet.get_Range(start, end);
                _Range.Merge(0);                     //单元格合并动作(要配合上面的get_Range()进行设计)
                _Range = (Microsoft.Office.Interop.Excel.Range)ExcelSheet.get_Range(start, end);
                _Range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
                _Range.Font.Size = 22; //设置字体大小
                _Range.Font.Name = "宋体"; //设置字体的种类 
                ExcelSheet.Cells[1, 1] = title;    //Excel单元格赋值
                _Range.EntireColumn.AutoFit(); //自动调整列宽
                //写表头
                for (int m = 1; m <= DT.Columns.Count; m++)
                {
                    ExcelSheet.Cells[2, m] = DT.Columns[m - 1].ColumnName.ToString();
                    start = "A2";
                    end = ChangeASC(DT.Columns.Count) + "2";
                    _Range = (Microsoft.Office.Interop.Excel.Range)ExcelSheet.get_Range(start, end);
                    _Range.Font.Size = 14; //设置字体大小
                    _Range.Font.Name = "宋体"; //设置字体的种类  
                    _Range.EntireColumn.AutoFit(); //自动调整列宽 
                    _Range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
                }
                //写数据
                for (int i = 0; i < DT.Rows.Count; i++)
                {
                    for (int j = 1; j <= DT.Columns.Count; j++)
                    {
                        //Excel单元格第一个从索引1开始
                        // if (j == 0) j = 1;
                        ExcelSheet.Cells[i + 3, j] = DT.Rows[i][j - 1].ToString();
                    }
                }
                //表格属性设置
                for (int n = 0; n < DT.Rows.Count + 1; n++)
                {
                    start = "A" + (n + 3).ToString();
                    end = ChangeASC(DT.Columns.Count) + (n + 3).ToString();
                    //获取Excel多个单元格区域
                    _Range = (Microsoft.Office.Interop.Excel.Range)ExcelSheet.get_Range(start, end);
                    _Range.Font.Size = 12; //设置字体大小
                    _Range.Font.Name = "宋体"; //设置字体的种类
                    _Range.EntireColumn.AutoFit(); //自动调整列宽
                    _Range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter; //设置字体在单元格内的对其方式 _Range.EntireColumn.AutoFit(); //自动调整列宽 
                }
                ExcelApp.DisplayAlerts = false; //保存Excel的时候，不弹出是否保存的窗口直接进行保存 
                ////弹出保存对话框,并保存文件
                Microsoft.Win32.SaveFileDialog sfd = new Microsoft.Win32.SaveFileDialog();
                sfd.DefaultExt = ".xlsx";
                sfd.Filter = "Office 2007 File|*.xlsx|Office 2000-2003 File|*.xls|所有文件|*.*";
                if (sfd.ShowDialog() == true)
                {
                    if (sfd.FileName != "")
                    {
                        ExcelBook.SaveAs(sfd.FileName);  //将其进行保存到指定的路径
                        System.Windows.MessageBox.Show("导出文件已存储为: " + sfd.FileName, "温馨提示");
                    }
                }
                //释放可能还没释放的进程
                ExcelBook.Close();
                ExcelApp.Quit();
                return sfd.FileName;
            }
            catch
            {
                //System.Windows.MessageBox.Show("导出文件保存失败,可能原因该文件已打开！", "警告！");
                return null;
            }
        }

该方法还不止这么多，还涉及到了1-27 = A-Z 的适配，如以下方法。

        /// 

        /// 获取当前列列名,并得到EXCEL中对应的列
        /// 
        /// 
        /// 
        private string ChangeASC(int count)
        {
            string ascstr = "";
            switch (count)
            {
                case 1:
                    ascstr = "A";
                    break;
                case 2:
                    ascstr = "B";
                    break;
                case 3:
                    ascstr = "C";
                    break;
                case 4:
                    ascstr = "D";
                    break;
                case 5:
                    ascstr = "E";
                    break;
                case 6:
                    ascstr = "F";
                    break;
                case 7:
                    ascstr = "G";
                    break;
                case 8:
                    ascstr = "H";
                    break;
                case 9:
                    ascstr = "I";
                    break;
                case 10:
                    ascstr = "J";
                    break;
                case 11:
                    ascstr = "K";
                    break;
                case 12:
                    ascstr = "L";
                    break;
                case 13:
                    ascstr = "M";
                    break;
                case 14:
                    ascstr = "N";
                    break;
                case 15:
                    ascstr = "O";
                    break;
                case 16:
                    ascstr = "P";
                    break;
                case 17:
                    ascstr = "Q";
                    break;
                case 18:
                    ascstr = "R";
                    break;
                case 19:
                    ascstr = "S";
                    break;
                case 20:
                    ascstr = "T";
                    break;
                default:
                    ascstr = "U";
                    break;
            }
            return ascstr;
        }

最后我们获取数据给方法，下面是设计了数据转换到datatable的一个过程。

private void Export(object sender, RoutedEventArgs e)
        {
            DataTable newTB = new DataTable();
            ObservableCollection instore = this.dataGrid.ItemsSource as ObservableCollection;
            List list = new List(instore.ToList());
              newTB = XTools.XHelper.Datavalidation.CopyToDataTable(list);
             ExcelExport(newTB, "入库记录");
        }

 

 public static class Datavalidation
    {
        public static DataTable CopyToDataTable(this IEnumerable array)
        {
            var ret = new DataTable();
            foreach (PropertyDescriptor dp in TypeDescriptor.GetProperties(typeof(T)))
                ret.Columns.Add(dp.Name);
            foreach (T item in array)
            {
                var Row = ret.NewRow();
                foreach (PropertyDescriptor dp in TypeDescriptor.GetProperties(typeof(T)))
                    Row[dp.Name] = dp.GetValue(item);
                ret.Rows.Add(Row);
            }
            return ret;
        }
}