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<T>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。
/// <summary>
/// 获取当前列列名,并得到EXCEL中对应的列
/// </summary>
/// <param name="count"></param>
/// <returns></returns>
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<XModel.STORE_IN> instore = this.dataGrid.ItemsSource as ObservableCollection<XModel.STORE_IN>;
List<XModel.STORE_IN> list = new List<XModel.STORE_IN>(instore.ToList());
newTB = XTools.XHelper.Datavalidation.CopyToDataTable<XModel.STORE_IN>(list);
ExcelExport(newTB, "入库记录");
}
public static class Datavalidation
{
public static DataTable CopyToDataTable<T>(this IEnumerable<T> 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;
}
}