使用iTextSharp将Gridview Templatefield转换为PDF

Question

我有一个gridview，我正在使用iTextSharp转换为PDF。我一直在跟着这个post的方法。

由于我使用VB.net，我已经更改了所有的C＃代码，但是我一直在遇到问题。

if (gvReport.Columns[columnNo] is TemplateField) 

我不知道如何写这条线在VB.net和我在GridView中有几个模板列（格式化）他们出现在PDF中为空白。

如果有人有任何想法，将不胜感激。

Answer 1

您可以随时使用这个网站：http://converter.telerik.com/

If TypeOf gvReport.Columns(columnNo) Is TemplateField Then 

其实，这里是一个为你整个方法：

Protected Sub ExportToPDF(gvReport As GridView, LandScape As Boolean) 
Dim noOfColumns As Integer = 0, noOfRows As Integer = 0 
Dim tbl As DataTable = Nothing 

If gvReport.AutoGenerateColumns Then 
    tbl = TryCast(gvReport.DataSource, DataTable) 
    ' Gets the DataSource of the GridView Control. 
    noOfColumns = tbl.Columns.Count 
    noOfRows = tbl.Rows.Count 
Else 
    noOfColumns = gvReport.Columns.Count 
    noOfRows = gvReport.Rows.Count 
End If 

Dim HeaderTextSize As Single = 8 
Dim ReportNameSize As Single = 10 
Dim ReportTextSize As Single = 8 
Dim ApplicationNameSize As Single = 7 

' Creates a PDF document 

Dim document As Document = Nothing 
If LandScape = True Then 
    ' Sets the document to A4 size and rotates it so that the  orientation of the page is Landscape. 
    document = New Document(PageSize.A4.Rotate(), 0, 0, 15, 5) 
Else 
    document = New Document(PageSize.A4, 0, 0, 15, 5) 
End If 

' Creates a PdfPTable with column count of the table equal to no of columns of the gridview or gridview datasource. 
Dim mainTable As New iTextSharp.text.pdf.PdfPTable(noOfColumns) 

' Sets the first 4 rows of the table as the header rows which will be repeated in all the pages. 
mainTable.HeaderRows = 4 

' Creates a PdfPTable with 2 columns to hold the header in the exported PDF. 
Dim headerTable As New iTextSharp.text.pdf.PdfPTable(2) 

' Creates a phrase to hold the application name at the left hand side of the header. 
Dim phApplicationName As New Phrase("Sample Application", FontFactory.GetFont("Arial", ApplicationNameSize, iTextSharp.text.Font.NORMAL)) 

' Creates a PdfPCell which accepts a phrase as a parameter. 
Dim clApplicationName As New PdfPCell(phApplicationName) 
' Sets the border of the cell to zero. 
clApplicationName.Border = PdfPCell.NO_BORDER 
' Sets the Horizontal Alignment of the PdfPCell to left. 
clApplicationName.HorizontalAlignment = Element.ALIGN_LEFT 

' Creates a phrase to show the current date at the right hand side of the header. 
Dim phDate As New Phrase(DateTime.Now.[Date].ToString("dd/MM/yyyy"), FontFactory.GetFont("Arial", ApplicationNameSize, iTextSharp.text.Font.NORMAL)) 

' Creates a PdfPCell which accepts the date phrase as a parameter. 
Dim clDate As New PdfPCell(phDate) 
' Sets the Horizontal Alignment of the PdfPCell to right. 
clDate.HorizontalAlignment = Element.ALIGN_RIGHT 
' Sets the border of the cell to zero. 
clDate.Border = PdfPCell.NO_BORDER 

' Adds the cell which holds the application name to the headerTable. 
headerTable.AddCell(clApplicationName) 
' Adds the cell which holds the date to the headerTable. 
headerTable.AddCell(clDate) 
' Sets the border of the headerTable to zero. 
headerTable.DefaultCell.Border = PdfPCell.NO_BORDER 

' Creates a PdfPCell that accepts the headerTable as a parameter and then adds that cell to the main PdfPTable. 
Dim cellHeader As New PdfPCell(headerTable) 
cellHeader.Border = PdfPCell.NO_BORDER 
' Sets the column span of the header cell to noOfColumns. 
cellHeader.Colspan = noOfColumns 
' Adds the above header cell to the table. 
mainTable.AddCell(cellHeader) 

' Creates a phrase which holds the file name. 
Dim phHeader As New Phrase("Sample Export", FontFactory.GetFont("Arial", ReportNameSize, iTextSharp.text.Font.BOLD)) 
Dim clHeader As New PdfPCell(phHeader) 
clHeader.Colspan = noOfColumns 
clHeader.Border = PdfPCell.NO_BORDER 
clHeader.HorizontalAlignment = Element.ALIGN_CENTER 
mainTable.AddCell(clHeader) 

' Creates a phrase for a new line. 
Dim phSpace As New Phrase(vbLf) 
Dim clSpace As New PdfPCell(phSpace) 
clSpace.Border = PdfPCell.NO_BORDER 
clSpace.Colspan = noOfColumns 
mainTable.AddCell(clSpace) 

' Sets the gridview column names as table headers. 
For i As Integer = 0 To noOfColumns - 1 
    Dim ph As Phrase = Nothing 

    If gvReport.AutoGenerateColumns Then 
     ph = New Phrase(tbl.Columns(i).ColumnName, FontFactory.GetFont("Arial", HeaderTextSize, iTextSharp.text.Font.BOLD)) 
    Else 
     ph = New Phrase(gvReport.Columns(i).HeaderText, FontFactory.GetFont("Arial", HeaderTextSize, iTextSharp.text.Font.BOLD)) 
    End If 

    mainTable.AddCell(ph) 
Next 

' Reads the gridview rows and adds them to the mainTable 
For rowNo As Integer = 0 To noOfRows - 1 
    For columnNo As Integer = 0 To noOfColumns - 1 
     If gvReport.AutoGenerateColumns Then 
      Dim s As String = gvReport.Rows(rowNo).Cells(columnNo).Text.Trim() 
      Dim ph As New Phrase(s, FontFactory.GetFont("Arial", ReportTextSize, iTextSharp.text.Font.NORMAL)) 
      mainTable.AddCell(ph) 
     Else 
      If TypeOf gvReport.Columns(columnNo) Is TemplateField Then 
       Dim lc As DataBoundLiteralControl = TryCast(gvReport.Rows(rowNo).Cells(columnNo).Controls(0), DataBoundLiteralControl) 
       Dim s As String = lc.Text.Trim() 
       Dim ph As New Phrase(s, FontFactory.GetFont("Arial", ReportTextSize, iTextSharp.text.Font.NORMAL)) 
       mainTable.AddCell(ph) 
      Else 
       Dim s As String = gvReport.Rows(rowNo).Cells(columnNo).Text.Trim() 
       Dim ph As New Phrase(s, FontFactory.GetFont("Arial", ReportTextSize, iTextSharp.text.Font.NORMAL)) 
       mainTable.AddCell(ph) 
      End If 
     End If 
    Next 

    ' Tells the mainTable to complete the row even if any cell is left incomplete. 
    mainTable.CompleteRow() 
Next 

' Gets the instance of the document created and writes it to the output stream of the Response object. 
PdfWriter.GetInstance(document, Response.OutputStream) 

' Creates a footer for the PDF document. 
Dim pdfFooter As New HeaderFooter(New Phrase(), True) 
pdfFooter.Alignment = Element.ALIGN_CENTER 
pdfFooter.Border = iTextSharp.text.Rectangle.NO_BORDER 

' Sets the document footer to pdfFooter. 
document.Footer = pdfFooter 
' Opens the document. 
document.Open() 
' Adds the mainTable to the document. 
document.Add(mainTable) 
' Closes the document. 
document.Close() 

Response.ContentType = "application/pdf" 
Response.AddHeader("content-disposition", "attachment; filename= SampleExport.pdf") 
Response.[End]() 

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