Question

我使用以下代码将带有图像的数据导出到Excel。

代码

protected void ExportToExcel(object sender, EventArgs e)
{
    //Get the data from database into datatable
    string strQuery = "select CustomerID, ContactName, City, PostalCode, display_picture" +
        " from customers";
    SqlCommand cmd = new SqlCommand(strQuery);
    DataTable dt = GetData(cmd);

    //Create a dummy GridView
    GridView GridView1 = new GridView();
    GridView1.AllowPaging = false;
    GridView1.DataSource = dt;
    GridView1.DataBind();

    Response.Clear();
    Response.Buffer = true;
    Response.AddHeader("content-disposition",
     "attachment;filename=DataTable.xls");
    Response.Charset = "";
    Response.ContentType = "application/vnd.ms-excel";
    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);

    for (int i = 0; i  .textmode { mso-number-format:\@; } ";
    Response.Write(style);
    Response.Output.Write(sw.ToString());
    Response.Flush();
    Response.End();
}

Excel正在正常下载。但问题是当我过滤Excel中的数据时。 Excel中的图片属于Move but don't size with cells属性。如何使用属性Move and size with cells生成图像？

Answer 1

您的代码根本不会创建Excel文件，它会创建一个HTML表格，并使用旧的二进制Excel格式（xls）的伪内容类型发送它。 Excel不会被欺骗，它会检测到这是一个HTML表并尝试使用默认设置导入它。这可能由于多种原因而中断。

使用像EPPlus这样的库创建真实的Excel文件要容易得多，也便宜得多。对于初学者，您可以直接从DataTable填充工作表：

protected void ExportToExcel(object sender, EventArgs e)
{
    ///...
    DataTable dt = GetData(cmd);

    using (ExcelPackage pck = new ExcelPackage())
    {
        //Create the worksheet
        var ws = pck.Workbook.Worksheets.Add("Demo");
        //Load the datatable into the sheet, starting from cell A1. 
        //Print the column names on row 1
        ws.Cells["A1"].LoadFromDataTable(dt, true);
        //That's it!

        //Write it back to the client
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        Response.AddHeader("content-disposition", "attachment;  filename=ExcelDemo.xlsx");
        Response.BinaryWrite(pck.GetAsByteArray());
    }
}

您可以使用Drawings.AddPicture方法添加图片：

ExcelPicture pic = ws.Drawings.AddPicture("pic1", new FileInfo("PathToMyImage.png"));

结果是一个xlsx文件，它是一个压缩的XML文件包。这意味着它实际上小于比通常生成的HTML表格或CSV文件而不是实际的Excel文件。

Answer 2

EasyXLS是一个库，它还可以使用图像导出xlsx和xls文件。

//Create a workbook
ExcelDocument workbook = new ExcelDocument();

//Add a worksheet
ExcelWorksheet worksheet = new ExcelWorksheet("Gridview");
workbook.easy_addWorksheet(worksheet);

//Add the gridview to the worksheet
DataSet dataSet = new DataSet();
dataSet.Tables.Add((DataTable)GridView1.DataSource);
worksheet.easy_insertDataSet(dataSet);

//Add an image
worksheet.easy_addImage("image.jpg", "A10");

//Exporting gridview with image
workbook.easy_WriteXLSXFile("DataTable.xlsx");

有关插入图片的更多信息，请访问：

http://www.easyxls.com/manual/basics/excel-image-import-export.html

如果从数据库加载图像字节，则需要在机器上本地临时保存图像。

您还可以查看how to export gridview to excel以查看有关格式化数据的详情。

将图像导出到Excel

2 个答案: