英文:
convert PDF to image but PDF file path not found
问题
我正在尝试使用第三方工具IronPdf在ASP.NET中使用C#语言将PDF文件转换为图像。当我提交表单时，它显示以下错误。
C:\Program Files\IIS Express\Invoice-63457.pdf 不是有效的PDF文件路径。该文件不存在。
我的代码如下所示：
视图部分：
<form action="@Url.Action("ConvertPDF","Home")" method="post" enctype="multipart/form-data">
<input type="file" id="postedFile" name="postedFile" multiple="multiple" />
<br /><br /><br />
<p>
<input type="submit" value="Upload Files" class="btn btn-lg btn-primary" />
</p>
</form>
控制器部分：
[HttpPost]
public ActionResult ConvertPDF(HttpPostedFileBase postedFile)
{
var pdf = PdfDocument.FromFile(postedFile.FileName);
// 提取所有页面为图像文件到文件夹
pdf.RasterizeToImageFiles(@"C:\image\folder\*.png");
// 提取所有页面为AnyBitmap对象
AnyBitmap[] pdfBitmaps = pdf.ToBitmap();
return RedirectToAction("Index");
}
如何解决这个问题？
英文:
I am trying to convert PDF file into image using third party tool IronPdf in ASP.NET using C# language. When I submit the form, it show the following error.
C:\Program Files\IIS Express\Invoice-63457.pdf is not a valid PDF file path. That file does not exist.
My code is given below here
View Part
<form action="@Url.Action("ConvertPDF","Home")" method="post" enctype="multipart/form-data">
<input type="file" id="postedFile" name="postedFile" multiple="multiple" />
<br /><br /><br />
<p>
<input type="submit" value="Upload Files" class="btn btn-lg btn-primary" />
</p>
</form>
Controller Part:
[HttpPost]
public ActionResult ConvertPDF(HttpPostedFileBase postedFile)
{
var pdf = PdfDocument.FromFile(postedFile.FileName);
// Extract all pages to a folder as image files
pdf.RasterizeToImageFiles(@"C:\image\folder\*.png");
// Extract all pages as AnyBitmap objects
AnyBitmap[] pdfBitmaps = pdf.ToBitmap();
return RedirectToAction("Index");
}
How to solve it?
答案1
得分: 2
原因
出现这个问题的原因是您尝试以错误的方式加载文件。您必须使用从Stream或Byte[]创建PdfDocument实例，因为当上传文件并在您的操作中接收该文件时，文件仅存在于Memory中。根据文档，您可以像下面这样创建PdfDocument实例。
public PdfDocument(byte[] PdfData, string Password = "")
或者
public PdfDocument(Stream PdfDataStream, string Password = "")
文档链接
https://ironpdf.com/object-reference/api/IronPdf.PdfDocument.html#constructors
解决方法
您必须将此部分替换为
var pdf = new PdfDocument(postedFile.InputStream);
英文:
Reason
The reason for this problem is you trying to load the file in the wrong way. You must use create PdfDocument instance from Stream or Byte[] because when a file upload and you receive that file in your action, the file only exists on Memory. according to document, you can create PdfDocument instance like below.
public PdfDocument(byte[] PdfData, string Password = "", string OwnerPassword = "")
or
public PdfDocument(Stream PdfDataStream, string Password = "", string OwnerPassword = "")
document link
https://ironpdf.com/object-reference/api/IronPdf.PdfDocument.html#constructors
Soultion
You must replace this section
var pdf = PdfDocument.FromFile(postedFile.FileName);
with this
var pdf = new PdfDocument(postedFile.InputStream);
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