Question

在我的项目中，我正在访问文件本地文件并将其复制到另一个文件，然后对其进行水印，但在复制时我收到IO异常“无法访问该文件”我确信该文件是免费的而不是任何其他进程访问任何机构可以告诉我什么是问题

我的代码是，

  protected void AddWaterMark(string file)
    {
        string watermark = "Confidential Document Printed on " + DateTime.Now.ToString();
        const int emSize = 40;
        try
        {
            // Get a fresh copy of the sample PDF file
            string filename = @"E:\Rajesh_Kumar\Application\Valuation\ExamManagement\ExamManagement\FileUpload\"+file;
            string filename1 =@"E:\Rajesh_Kumar\Application\Valuation\ExamManagement\ExamManagement\FileUpload\" + file; ;
            bool b = true;// File_lock(filename);
            if(b==true)
            {
                File.Copy(Path.Combine(@"E:\Rajesh_Kumar\Application\Valuation\ExamManagement\ExamManagement\FileUpload",
                filename), Path.Combine(@"E:\Rajesh_Kumar\Application\Valuation\ExamManagement\ExamManagement\UFileUpload ",
                filename1), true); //Exception was Thrown Here
            // Create the font for drawing the watermark
            XFont font = new XFont("Times New Roman", emSize, XFontStyle.BoldItalic);
            // Open an existing document for editing and loop through its pages
            PdfDocument document = PdfReader.Open(filename);
            // Set version to PDF 1.4 (Acrobat 5) because we use transparency.
            if (document.Version < 14)
                document.Version = 14;
            for (int idx = 0; idx < document.Pages.Count; idx++)
            {
                //if (idx == 1) break;
                PdfPage page = document.Pages[idx];
                // Variation 1: Draw watermark as text string
                // Get an XGraphics object for drawing beneath the existing content
                XGraphics gfx = XGraphics.FromPdfPage(page, XGraphicsPdfPageOptions.Prepend);
                // Get the size (in point) of the text
                XSize size = gfx.MeasureString(watermark, font);
                // Define a rotation transformation at the center of the page
                gfx.TranslateTransform(page.Width / 2, page.Height / 2);
                gfx.RotateTransform(-Math.Atan(page.Height / page.Width) * 180 / Math.PI);
                gfx.TranslateTransform(-page.Width / 2, -page.Height / 2);
                // Create a string format
                XStringFormat format = new XStringFormat();
                format.Alignment = XStringAlignment.Near;
                format.LineAlignment = XLineAlignment.Near;
                // Create a dimmed red brush
                XBrush brush = new XSolidBrush(XColor.FromArgb(128, 255, 0, 0));
                // Draw the string
                gfx.DrawString(watermark, font, brush,
                  new XPoint((page.Width - size.Width) / 2, (page.Height - size.Height) / 2),format);
            }
            // Save the document...
            document.Save(filename);
            // ...and start a viewer
            Process.Start(filename);
            File.Exists(filename);
            }
        }
        catch(Exception ex)
        {
            ClientMessaging(ex.Message);
        }           
    }.

Answer 1

问题是您正在尝试将文件复制到自身并尝试在过程中覆盖该文件

File.Copy("TextFile1.txt", "TextFile1.txt", true); //throws the error: "The process cannot access the file 'TextFile1.txt' because it is being used by another process."
File.Copy("TextFile1.txt", "TextFile2.txt", true); //copies the file

Answer 2

我以前去过那里，也许你可以尝试这样做：

public bool FileIsLocked(string strFullFileName)
{
    bool blnReturn = false;
    System.IO.FileStream fs = null;

    try {
        fs = System.IO.File.Open(strFullFileName, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Read, System.IO.FileShare.None);
        fs.Close();
    } catch (System.IO.IOException ex) {
        blnReturn = true;
    }

    return blnReturn;
}

进程无法访问文件“\ Path”，因为某些其他进程正在使用它

2 个答案: