C#如何将图像加载到代码隐藏生成的表中？

Question

我正在使用 asp.net/c# 创建一个将被下载的 PDF 文件。这一切都是在后面的代码中通过创建一系列加载到 div 创建的 HTMLGenericControl 中的 HTMLTable 来完成的。然后将此 div 转换为字符串并传递给生成 PDF 文件的函数。下面是一个代码示例：

//This dataset contains the student's name, age and grade, want it for all sections
List<studentExportPersonal> lsep = sp.getExportPersonal(exportStudents);

//Page Header containg Grade, Student Name, and Age
HtmlGenericControl div = new HtmlGenericControl("div");

foreach (studentExportPersonal sep in lsep)
{
    foreach (string sec in secs)
    {
        HtmlTable identityTable = new HtmlTable();
        div.Controls.Add(identityTable);

        identityTable.Width = "100%";
        identityTable.Border = 0;
        identityTable.Style.Add("margin-bottom", "20px");

        HtmlTableRow identityTR = new HtmlTableRow();
        identityTable.Rows.Add(identityTR);

        HtmlTableCell tdGrade = new HtmlTableCell();
        identityTR.Cells.Add(tdGrade);
        tdGrade.Style.Add("font-size", "30px");
        tdGrade.Align = "center";
        tdGrade.RowSpan = 2;
        tdGrade.InnerText = sep.si.studentGrade;

        HtmlTableCell tdStudentName = new HtmlTableCell();
        identityTR.Cells.Add(tdStudentName);
        tdStudentName.Style.Add("font-size", "30px");
        tdStudentName.Align = "center";
        tdStudentName.InnerText = sep.si.studentName;

        HtmlTableCell tdStudentAge = new HtmlTableCell();
        identityTR.Cells.Add(tdStudentAge);
        tdStudentAge.Style.Add("font-size", "30px");
        tdStudentAge.Align = "center";
        tdStudentAge.RowSpan = 2;
        tdStudentAge.InnerText = sep.si.studentAge + " Years Old";

        HtmlTableRow identityTR1 = new HtmlTableRow();
        identityTable.Rows.Add(identityTR1);

        HtmlTableCell tdPic = new HtmlTableCell();
        identityTR1.Cells.Add(tdPic);

        Bitmap studPic;

        if (HttpContext.Current.Request.IsLocal)
            studPic = (Bitmap)System.Drawing.Image.FromFile(@"C:\studentPics\" + sep.si.studentPicID, true);
        else
            studPic = (Bitmap)System.Drawing.Image.FromFile(@"E:\Website\Cascade\studentPics\" + sep.si.studentPicID, true);
    }
}

export dmc = new export();

var sb = new StringBuilder();
div.RenderControl(new HtmlTextWriter(new StringWriter(sb)));
string s = sb.ToString();

dmc.exportPDF("Student Profiles", "Portrait", s);

在 foreach 循环的底部你可以看到我正在创建一个位图变量，我的问题是，如何将它加载到 HTMLTableCell 变量中？

Answer 1

您可以将图像添加到单元格，就像将单元格添加到行一样。

HtmlImage image = new HtmlImage();
image.Src ="/studentPics/" + sep.si.studentPicID;
tdPic.Controls.Add(image);

但是，当我查看您的代码时，我认为 GridView 会是更好的选择。 您可以将 List 直接绑定到 GridView。

<asp:GridView ID="GridView1" runat="server"></asp:GridView>

if (!Page.IsPostBack)
{
    GridView1.DataSource = lsep;
    GridView1.DataBind();
}