我正在构建一个需要在GridView控件中显示数据的应用程序，按特定值分组，然后将其导出为PDF。我在这里使用这组类（http://www.agrinei.com/gridviewhelper/gridviewhelper_pt.htm）进行分组，然后效果很好。但是，我必须将EnableViewState设置为false才能正常工作。当我需要将其导出为PDF时，问题就出现了。以前（在使用GridViewHelper之前），这是有效的。但是，它现在生成一个空报告（我想因为EnableViewState为false）。
如何保存通过使用GridViewHelper类生成的GridView的数据和结构，以便将其导出为PDF？
我的一些aspx（为简洁起见省略了部分代码）
public partial class all : System.Web.UI.Page
{
Int32 userID;
Int32 currentID;
protected void Page_Load(object sender, EventArgs e)
{
GridViewHelper helper = new GridViewHelper(allTicketGrid);
helper.RegisterGroup("propName", true, true);
helper.ApplyGroupSort();
userID = Convert.ToInt32(Session["userID"]);
if (Session["userLevel"] == null || Session["userLevel"] == "")
{
Response.Redirect("~/Default.aspx");
}
if (!IsPostBack)
{
this.populate();
}
}
protected void populate()
{
toDateBox.Text = DateTime.Now.ToShortDateString();
fromDateBox.Text = DateTime.Now.ToShortDateString();
using (ticketModel dbContext = new ticketModel())
{
END_USER user = dbContext.END_USER.First(u => u.END_USER_ID == userID);
itemCheckBoxList.DataSource = dbContext.ITEM_TYPE.ToList();
itemCheckBoxList.DataTextField = "DESCRIPTION";
itemCheckBoxList.DataValueField = "ITEM_TYPE_ID";
itemCheckBoxList.DataBind();
List<Int32> propIDList = new List<Int32>();
foreach(END_USER_PROPERTY item in user.END_USER_PROPERTY.ToList() ) {
propIDList.Add((Int32)item.PROPERTY_ID);
}
locationCheckBoxList.DataSource = dbContext.PROPERTies.Where(p=> propIDList.Contains(p.PROPERTY_ID)).ToList();
locationCheckBoxList.DataTextField = "SHORT_NAME";
locationCheckBoxList.DataValueField = "PROPERTY_ID";
locationCheckBoxList.DataBind();
}
}
protected void exportReport(object sender, EventArgs e)
{
DataTable dt = new DataTable();
for (int i = 0; i < allTicketGrid.Columns.Count; i++)
{
dt.Columns.Add(allTicketGrid.Columns[i].HeaderText);
}
foreach (GridViewRow rowView in allTicketGrid.Rows)
{
DataRow dr = dt.NewRow();
for (int i = 0; i < rowView.Cells.Count; i++)
{
dr[i] = rowView.Cells[i].Text.Trim();
}
dt.Rows.Add(dr);
}
Document doc = pdfWorker.readyDocument();
pdfWorker.createTable(doc, dt);
String filePath = Server.MapPath("~/reports/files/");
String fileName = "report_" + DateTime.Now.ToString("MM-dd-yyyy") + ".pdf";
filePath += fileName;
pdfWorker.savePDF(doc, filePath);
Response.ContentType = "application/pdf";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);
Response.TransmitFile(filePath);
Response.End();
}
protected void generateReport(object sender, EventArgs e)
{
int[] selectedLocations = getLocations();
int[] selectedItemTypes = getItems();
DateTime from = Convert.ToDateTime(fromDateBox.Text);
DateTime to = Convert.ToDateTime(toDateBox.Text);
if (!allButton.Checked)
{
Int32 statusID;
if (openButton.Checked)
{
statusID = 1;
}
else
{
statusID = 2;
}
using (ticketModel dbContext = new ticketModel())
{
allTicketGrid.DataSource = dbContext.TICKETs.Where(t => t.STATUS_TYPE.STATUS_TYPE_ID == statusID && selectedLocations.Contains(t.PROPERTY_ID) && selectedItemTypes.Contains(t.ITEM_TYPE_ID) && t.OPEN_STATUS.UPDATED_DATE >= from && t.OPEN_STATUS.UPDATED_DATE <= to).ToList();
allTicketGrid.DataBind();
}
}
else
{
using (ticketModel dbContext = new ticketModel())
{
allTicketGrid.DataSource = dbContext.TICKETs.Where(t => selectedLocations.Contains(t.PROPERTY_ID) && selectedItemTypes.Contains(t.ITEM_TYPE_ID) && t.OPEN_STATUS.UPDATED_DATE >= from && t.OPEN_STATUS.UPDATED_DATE <= to).ToList();
allTicketGrid.DataBind();
}
}
}
和我的pdfWorker类：
static class pdfWorker
{
public static Document readyDocument() {
Document doc = new Document();
Section section = doc.AddSection();
Style docStyles = doc.Styles["Normal"];
docStyles.Document.DefaultPageSetup.Orientation = MigraDoc.DocumentObjectModel.Orientation.Landscape;
docStyles.Font.Size = 8;
docStyles.ParagraphFormat.FirstLineIndent = 0;
return doc;
}
public static void createTable(Document document, DataTable dataTable)
{
Table table = new Table();
table.Format.Font.Size = 6;
table.BottomPadding = 10;
int colCount = dataTable.Columns.Count;
Row pdfRow;
Cell pdfCell;
for (int i = 0; i < colCount; i++)
{
table.AddColumn();
}
pdfRow = table.AddRow();
for (int i = 0; i < colCount; i++)
{
pdfCell = pdfRow.Cells[i];
pdfCell.Row.Format.Font.Size = 10;
pdfCell.AddParagraph(dataTable.Columns[i].ToString());
}
foreach (DataRow row in dataTable.Rows)
{
pdfRow = table.AddRow();
pdfRow.HeightRule = RowHeightRule.AtLeast;
for (int i = 0; i < colCount; i++)
{
pdfCell = pdfRow.Cells[i];
pdfCell.AddParagraph(row[i].ToString());
}
}
document.LastSection.Add(table);
}
public static void savePDF(Document doc, String fileName) {
PdfDocumentRenderer renderer = new PdfDocumentRenderer(true, PdfSharp.Pdf.PdfFontEmbedding.Always);
SaveFileDialog saveDialog = new SaveFileDialog();
renderer.Document = doc;
renderer.RenderDocument();
renderer.PdfDocument.Save(fileName);
}
}
}
非常感谢您的帮助。
答案 0 :(得分：1)
您可以将填充GridView的代码放在一个单独的方法中：
protected void generateReport(object sender, EventArgs e)
{
BindReportData();
}
private void BindReportData()
{
int[] selectedLocations = getLocations();
int[] selectedItemTypes = getItems();
DateTime from = Convert.ToDateTime(fromDateBox.Text);
DateTime to = Convert.ToDateTime(toDateBox.Text);
if (!allButton.Checked)
{
Int32 statusID;
if (openButton.Checked)
{
statusID = 1;
}
else
{
statusID = 2;
}
using (ticketModel dbContext = new ticketModel())
{
allTicketGrid.DataSource = dbContext.TICKETs.Where(t => t.STATUS_TYPE.STATUS_TYPE_ID == statusID && selectedLocations.Contains(t.PROPERTY_ID) && selectedItemTypes.Contains(t.ITEM_TYPE_ID) && t.OPEN_STATUS.UPDATED_DATE >= from && t.OPEN_STATUS.UPDATED_DATE <= to).ToList();
allTicketGrid.DataBind();
}
}
else
{
using (ticketModel dbContext = new ticketModel())
{
allTicketGrid.DataSource = dbContext.TICKETs.Where(t => selectedLocations.Contains(t.PROPERTY_ID) && selectedItemTypes.Contains(t.ITEM_TYPE_ID) && t.OPEN_STATUS.UPDATED_DATE >= from && t.OPEN_STATUS.UPDATED_DATE <= to).ToList();
allTicketGrid.DataBind();
}
}
}
在exportReport：
protected void exportReport(object sender, EventArgs e)
{
BindReportData();
...
}