第一种:使用 Microsoft.Office.Interop.Excel.dll
首先需要安装 office 的 excel,然后再找到 Microsoft.Office.Interop.Excel.dll 组件,添加到引用。
public void ExportExcel(DataTable dt)
{
if (dt != null)
{
Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
if (excel == null)
{
return;
}
//设置为不可见,操作在后台执行,为 true 的话会打开 Excel
excel.Visible = false;
//打开时设置为全屏显式
//excel.DisplayFullScreen = true;
//初始化工作簿
Microsoft.Office.Interop.Excel.Workbooks workbooks = excel.Workbooks;
//新增加一个工作簿,Add()方法也可以直接传入参数 true
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
//同样是新增一个工作簿,但是会弹出保存对话框
//Microsoft.Office.Interop.Excel.Workbook workbook = excel.Application.Workbooks.Add(true);
//新增加一个 Excel 表(sheet)
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];
//设置表的名称
worksheet.Name = dt.TableName;
try
{
//创建一个单元格
Microsoft.Office.Interop.Excel.Range range;
int rowIndex = 1; //行的起始下标为 1
int colIndex = 1; //列的起始下标为 1
//设置列名
for (int i = 0; i < dt.Columns.Count; i++)
{
//设置第一行,即列名
worksheet.Cells[rowIndex, colIndex + i] = dt.Columns[i].ColumnName;
//获取第一行的每个单元格
range = worksheet.Cells[rowIndex, colIndex + i];
//设置单元格的内部颜色
range.Interior.ColorIndex = 33;
//字体加粗
range.Font.Bold = true;
//设置为黑色
range.Font.Color = 0;
//设置为宋体
range.Font.Name = "Arial";
//设置字体大小
range.Font.Size = 12;
//水平居中
range.HorizontalAlignment = Microsoft.Office.Interop.Excel.XlHAlign.xlHAlignCenter;
//垂直居中
range.VerticalAlignment = Microsoft.Office.Interop.Excel.XlVAlign.xlVAlignCenter;
}
//跳过第一行,第一行写入了列名
rowIndex++;
//写入数据
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
worksheet.Cells[rowIndex + i, colIndex + j] = dt.Rows[i][j].ToString();
}
}
//设置所有列宽为自动列宽
//worksheet.Columns.AutoFit();
//设置所有单元格列宽为自动列宽
worksheet.Cells.Columns.AutoFit();
//worksheet.Cells.EntireColumn.AutoFit();
//是否提示,如果想删除某个sheet页,首先要将此项设为fasle。
excel.DisplayAlerts = false;
//保存写入的数据,这里还没有保存到磁盘
workbook.Saved = true;
//设置导出文件路径
string path = HttpContext.Current.Server.MapPath("Export/");
//设置新建文件路径及名称
string savePath = path + DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss") + ".xlsx";
//创建文件
FileStream file = new FileStream(savePath, FileMode.CreateNew);
//关闭释放流,不然没办法写入数据
file.Close();
file.Dispose();
//保存到指定的路径
workbook.SaveCopyAs(savePath);
//还可以加入以下方法输出到浏览器下载
FileInfo fileInfo = new FileInfo(savePath);
OutputClient(fileInfo);
}
catch(Exception ex)
{
}
finally
{
workbook.Close(false, Type.Missing, Type.Missing);
workbooks.Close();
//关闭退出
excel.Quit();
//释放 COM 对象
Marshal.ReleaseComObject(worksheet);
Marshal.ReleaseComObject(workbook);
Marshal.ReleaseComObject(workbooks);
Marshal.ReleaseComObject(excel);
worksheet = null;
workbook = null;
workbooks = null;
excel = null;
GC.Collect();
}
}
}
public void OutputClient(FileInfo file)
{
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ClearHeaders();
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
//导出到 .xlsx 格式不能用时,可以试试这个
//HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadshee>+ |