1.引入EPPlus.dll,旧版的是OfficeOpenXml.dll，最好使用EPPlus
2.调用 string path = UploadExecl(batchUpload.BinaryExcel, "xlsx");，获取上传的xlsx路径
3. 下载Execl
3.1 如果是<a> 标签的连接，可以将方法直接写在 href上就能直接下载
<a href="/FangAn/DetailAuditOutPut/" target="_blank" style="color:#fff;"><el-button type="primary">导出Execl</el-button></a>
后台方法调用：
byte[] result = GetExcelByte(model);
返回值为 File();
return File(result, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", model.OrderName + ".xlsx");
3.2 如果是js异步操作,需要下载的话：
后台方法调用：
byte[] result = GetExcelByte(dt, modelReturn.errMessage);
string basestr = Convert.ToBase64String(result);
返回值为base64的字符串
return basestr;
而前台，在需要多加一步操作，可以直接下载：
//res.data 为异步返回值，就是basestr
window.location.href = "data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64," + res.data;
/// <summary>
/// datatable导出
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public byte[] GetExcelByte(DataTable dt, string err)
{
using (ExcelPackage package = new ExcelPackage())
{
ExcelWorksheet workSheet = package.Workbook.Worksheets.Add("候车亭批量导入");
workSheet.Cells[1, 1].Value = "媒体类型*";
workSheet.Cells[1, 2].Value = "类型子类*";
workSheet.Cells[1, 3].Value = "媒体位置*";
for (int i = 1; i < dt.Rows.Count; i++)
{
DataRow dr = dt.Rows[i];
workSheet.Cells[i + 1, 1].Value = dr[0];
workSheet.Cells[i + 1, 2].Value = dr[1];
workSheet.Cells[i + 1, 3].Value = dr[2];
}
return package.GetAsByteArray();
}
}
/// <summary>
/// execl转成table
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
public DataTable ExcelToTable(string path)
{
DataTable vTable = new DataTable();
FileInfo existingFile = new FileInfo(path);
try
{
FileInfo file = new FileInfo(path);
using (ExcelPackage package = new ExcelPackage(file))
{
ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
int vSheetCount = package.Workbook.Worksheets.Count;
//获取总Sheet页
int maxColumnNum = worksheet.Dimension.End.Column;//最大列
int minColumnNum = worksheet.Dimension.Start.Column;//最小列
int maxRowNum = worksheet.Dimension.End.Row;//最小行
int minRowNum = worksheet.Dimension.Start.Row;//最大行
DataColumn vC;
for (int j = 1; j <= maxColumnNum; j++)
{
vC = new DataColumn("A_" + j, typeof(string));
vTable.Columns.Add(vC);
}
for (int n = 1; n <= maxRowNum; n++)
{
DataRow vRow = vTable.NewRow();
for (int m = 1; m <= maxColumnNum; m++)
{
vRow[m - 1] = worksheet.Cells[n, m].Value;
}
vTable.Rows.Add(vRow);
}
}
}
catch (Exception vErr)
{
Console.WriteLine(vErr.Message);
}
return vTable;
}
/// <summary>
/// 把二进制流转成文件
/// </summary>
/// <param name="path">二进制流，类似(data:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;base64,)开头的字符串</param>
/// <param name="path">文件扩展名</param>
/// <returns></returns>
public string UploadExecl(string path, string extension)
{
string sPath = host.ContentRootPath + "\\BatchUpload";//保存的路径
if (!Directory.Exists(sPath))
{
Directory.CreateDirectory(sPath);
}
var regex = new Regex(@"data:(?<mime>[\w/\-\.]+);(?<encoding>\w+),(?<data>.*)", RegexOptions.Compiled);
var match = regex.Match(path);
var mimeType = match.Groups["mime"].Value;
var encodingCode = match.Groups["encoding"].Value;
var data = match.Groups["data"].Value;
byte[] targetFileByte = Convert.FromBase64String(data);
string[] mimeExtension = mimeType.Split(‘/‘);
string fileExtension = extension;
Random random = new Random();
//文件保存
string fileName = string.Format("{0:yyyyMMddHHmmss}{1}", DateTime.Now, random.Next());
string filePath = string.Format("{0}\\{1}.{2}", sPath, fileName, fileExtension);
FileStream file = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write);
file.Write(targetFileByte,0, targetFileByte.Length);
file.Close();
return filePath;
}