将 gridview 导出为 PDf 时更改标题的颜色

Question

我正在将 gridview 导出为 pdf。一切正常，但是，当生成 PDF 时，背景为白色，标题字体颜色为灰色。真的很难看。我正在尝试在导出之前将标题前景色更改为黑色。它不工作。

有什么建议吗？

  public void ExportToPDF()
    {
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-disposition", "attachment;filename=CallDetail.pdf");
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        GridView1.AllowPaging = false;
        this.GetData();
        GridView1.RenderControl(hw);
        HtmlForm frm = new HtmlForm();
        frm.Attributes["runat"] = "server";
        GridView1.HeaderRow.Style.Add("width", "15%");
        GridView1.HeaderRow.Style.Add("font-size", "10px");
        GridView1.Style.Add("text-decoration", "none");
        GridView1.Style.Add("font-family", "Arial, Helvetica, sans-serif;");
        GridView1.Style.Add("font-size", "26px");
        for (int col = 0; col < GridView1.HeaderRow.Controls.Count; col++)
        {
            TableCell tc = GridView1.HeaderRow.Cells[col];
            tc.Style.Add("color", "#FFFFFF");
            tc.Style.Add("background-color", "#444");
        }
        StringReader sr = new StringReader(sw.ToString());
        Document pdfDoc = new Document(PageSize.A2, 7f, 7f, 7f, 0f);
        HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
        pdfDoc.Open();
        htmlparser.Parse(sr);
        pdfDoc.Close();
        Response.Write(pdfDoc);
        Response.End();


    }

UPDATE*** 添加了更新的代码和屏幕截图。

Answer 1

在导出前直接设置表头的ForeColor 并不会真正影响表头样式。可能的替代方法是遍历所有标题单元格并设置为您需要的任何样式（这确实有效）。您可以尝试更改以下代码行

GridView1.HeaderStyle.ForeColor = System.Drawing.Color.Black;

与

for (int col = 0; col < GridView1.HeaderRow.Controls.Count; col++)
{
    TableCell tc = GridView1.HeaderRow.Cells[col];
    tc.Style.Add("color", "#FFFFFF");
    tc.Style.Add("background-color", "#444");
}