使用itextsharp添加图像 [英] Add image using itextsharp

问题描述

我正在尝试以PDF格式导出数据，现在我尝试使用itext sharp在PDF中添加图像我试试这个但是这显示错误..我尝试下面的代码但这显示错误当我在PDF文件中添加图像我成功添加文本

I am trying to export data in PDF and now i try to add image in PDF using itext sharp i try this but this shows an error ..Is try below code but this shows an error when i add image in PDF file i successfully add text

Private Sub ExportGridToPDF()

        Dim headerText As String = "file"


        Response.ContentType = "application/pdf"
        Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.pdf")
        Response.Cache.SetCacheability(HttpCacheability.NoCache)
        Dim sw As New StringWriter()
        Dim hw As New HtmlTextWriter(sw)
        GridView1.AllowPaging = False

        GridView1.DataBind()
        GridView1.RenderControl(hw)
        Dim sr As New StringReader(sw.ToString())
        Dim pdfDoc As New iTextSharp.text.Document(iTextSharp.text.PageSize.A1, 10.0F, 10.0F, 10.0F, 0.0F)

        Dim beginning As New iTextSharp.text.Chunk(headerText)
        Dim p1 As New iTextSharp.text.Phrase(beginning)
        Dim p2 As New iTextSharp.text.Phrase()
        p2.Add(p1)
        Dim p As New iTextSharp.text.Paragraph()
        p.Add(p2)
        Dim htmlparser As New HTMLWorker(pdfDoc)
        PdfWriter.GetInstance(pdfDoc, Response.OutputStream)

        pdfDoc.Open()
        pdfDoc.Add(p)

         Dim im As Image = iTextSharp.text.Image.GetInstance(imagepath + "/mikesdotnetting.tif")

    pdfDoc.Add(im)


        htmlparser.Parse(sr)
        pdfDoc.Close()
        Response.Write(pdfDoc)
        Response.End()
    End Sub

此部分

        Dim im As Image = iTextSharp.text.Image.GetInstance(imagepath + "/mikesdotnetting.tif")

    pdfDoc.Add(im)

这显示此行中的错误

 Dim jpg As Image = iTextSharp.text.Image.GetInstance(New Uri(url))

错误

 **Value of type 'iTextSharp.text.Image' cannot be converted to 'System.Web.UI.WebControls.Image'.**    

任何解决方案？

推荐答案

您在同一代码中使用来自不同包/命名空间的两个名为 Image 的类。这是模棱两可的。你应该使用完全限定的名字。

You are using two classes named Image from a different package / namespace in the same code. That is ambiguous. You should use fully qualified names.

我不是.Net开发人员，但如果这是Java，你会做这样的事情：

I'm not a .Net developer, but if this were Java, you'd do something like this:

Dim im As iTextSharp.text.Image = iTextSharp.text.Image.GetInstance(imagepath + "/mikesdotnetting.tif")

您的问题是由您创建变量 jpg 引起的类型 System.Web.UI.WebControls.Image ，但是您要分配类型为 iTextSharp.text.Image 到那个变量。很明显，这不起作用。

Your problem is caused by the fact that you create a variable jpg that is of type System.Web.UI.WebControls.Image, but you are assigning an object of type iTextSharp.text.Image to that variable. It is obvious that this doesn't work.

当你有两个同名的类（ Image ）时在两个不同的命名空间 System.Web.UI.WebControls 和 iTextSharp.text 中，你应该避免引入含糊之处。

When you have two classes with the same name (Image) in two different namespaces System.Web.UI.WebControls and iTextSharp.text, you should avoid introducing ambiguities.

阅读解决含糊不清的参考资料了解更多信息信息。

Read Resolving an ambiguous reference for more info.

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