asp.net - 如何使用DataTable和ExcelLibrary创建Excel工作表？

我有不包含列的数据表，也没有带有“ DATE”数据类型的日期。
我尝试了以下选项

1）第三部分DLL- ExcelLibrary
如果数据集中没有日期列，则工作正常，否则使用-65284之类的伪值代替日期。

ExcelLibrary.DataSetHelper.CreateWorkbook(@"C:\Users\ABC\Documents\Excel\Report123.xls", ds);

2）使用简单的导出格式，而无需使用第三方DLL

public void ExportToExcel(System.Data.DataTable dt)
{
    if (dt.Rows.Count > 0)
    {
        string filename = "Report123.xls";
        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
        DataGrid dgGrid = new DataGrid();
        dgGrid.DataSource = dt;
        dgGrid.DataBind();

        //Get the HTML for the control.
        dgGrid.RenderControl(hw);
        //Write the HTML back to the browser.
        //Response.ContentType = application/vnd.ms-excel;
        Response.ContentType = "application/vnd.ms-excel";
        Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
        this.EnableViewState = false;
        Response.Write(tw.ToString());
        Response.End();
    }
}

在上面的代码中，Excel完美地提取了，但是当我们打开相同的Excel时，格式错误。

我也想读取数据表中的相同文件以存储在数据库中。当我去阅读创建的excel（通过第二个选项）时，我得到外部表不是预期格式的错误。如果我另存为同一文件，则它可以工作。

但是我不想每次都“另存为”文件。请帮我

更新：

public void ExportToExcel1(System.Data.DataTable dt)
{
    //clear the response of any junk. This may not be necessary
    Response.Clear();

    //add a header so it has a nice file name
    Response.AddHeader("content-disposition", "attachment;filename=Reportengg.xlsx");

    //Set the MIME type correctly
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

    //create a new package, this is the equivalent of an XLSX file.
    var package = new ExcelPackage();

    //Add a new sheet to the workbook
    var sheet = package.Workbook.Worksheets.Add("Sheet1");

    //EPPlus contains helper function to load data from a DataTable, though you could manually fill in rows/column values yourself if you want
    sheet.Cells["A1"].LoadFromDataTable(dt, true);
  //  byte[] array = package.GetAsByteArray();
    //write the file bytes to the response
    Response.BinaryWrite(package.GetAsByteArray());


    //end the response so we don't send anymore down and corrupt the file
    Response.End();
}

最佳答案

您的＃1技术是将文件保存在服务器上。服务器端代码无法直接保存到客户端文件系统。您必须将文件字节写入响应，然后客户端的PC将选择如何处理。他们是选择“另存为”还是直接保存到某些“下载”文件夹，取决于他们的浏览器设置。我不熟悉ExcelLibrary，但我想他们有某种API可以获取文件字节？去做。然后将这些字节写入响应。

byte[] bytes = GetBytesFromTheirApiSomehow();
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AppendHeader("Content-Disposition", "attachment; filename=filename.xlsx");
Response.BinaryWrite(bytes);
Response.End();

我看了一下ExcelLibrary源代码。该库似乎不再维护。也许您应该移至积极维护的库，例如EPPlus。 EPPlus实现可能如下所示：

public void ExportToExcel(System.Data.DataTable dt)
{
    //clear the response of any junk. This may not be necessary
    Response.Clear();

    //add a header so it has a nice file name
    Response.AddHeader("content-disposition", "attachment;filename=myexcelfile.xlsx");

    //Set the MIME type correctly
    Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

    //create a new package, this is the equivalent of an XLSX file.
    var package = new ExcelPackage();

    //Add a new sheet to the workbook
    var sheet = package.Workbook.Worksheets.Add("My Data");

    //EPPlus contains helper function to load data from a DataTable, though you could manually fill in rows/column values yourself if you want
    sheet.Cells["A1"].LoadFromDataTable(dt, true);

    //write the file bytes to the response
    Response.BinaryWrite(package.GetAsByteArray());

    //end the response so we don't send anymore down and corrupt the file
    Response.End();
}