如何使用DataTable和ExcelLibrary创建Excel表？

Question

我有数据表，它不包含任何列，也有日期和“日期”数据类型。我试过以下选项

1)第3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之类的虚拟值来代替date。

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

2)使用简单的导出格式，而不使用第三方DLL，如下所示

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，完美地提取了Excel，但是当我们打开相同的excel时，会出现格式错误的错误。

另外，我希望在datatable中读取相同的文件以存储在数据库中。当我去阅读创建的excel (第二个选项)时，我会得到外部表没有预期格式的错误。如果我保存为相同的文件，那么它可以工作文件。

但我不想每次“另存为”文件。请帮帮我

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();
}

Answer 1

您的第一技术是将文件保存在服务器上。服务器端代码不能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将选择如何处理它。它们是选择“另存为”，还是直接保存到某些下载文件夹，取决于它们的浏览器设置。我不熟悉ExcelLibrary，但我想他们有某种API来获取文件字节？就这么做吧。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。那个图书馆似乎不再被维护了。也许您应该迁移到一个主动维护的库中，比如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();
}

Answer 2

这对我起了作用：

        Response.ClearContent();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "Report123.xls"));
        Response.ContentType = "application/vnd.ms-excel";
        System.IO.StringWriter sw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(sw);
        GridView1.AllowPaging = false;
        GridView1.RenderControl(hw);
        Response.Write(sw.ToString());
        Response.End();