相关疑难解决方法(0)

我试图将两个PDF文件读入两个内存流,然后返回一个包含两个流数据的流.但我似乎不明白我的代码有什么问题.

示例代码:

string file1Path = "Sampl1.pdf";
string file2Path = "Sample2.pdf";
MemoryStream stream1 = new MemoryStream(File.ReadAllBytes(file1Path));
MemoryStream stream2 = new MemoryStream(File.ReadAllBytes(file2Path));
stream1.Position = 0;
stream1.Copyto(stream2);
return stream2;   /*supposed to be containing data of both stream1 and stream2 but contains data of stream1 only*/  

我是asp.net的初学者,我用PdfRpt创建pdf文件.我在课堂上写这段代码

namespace PdfReportSamples.CustomPriceNumber
{
    public class CustomPriceNumberPdfReport
    {
        public IPdfReportData CreatePdfReport()
        {
            using (var memoryStream = new MemoryStream())
            {
                var ii= new PdfReport().DocumentPreferences(doc =>
                {
                    doc.RunDirection(PdfRunDirection.LeftToRight);
                    doc.Orientation(PageOrientation.Portrait);
                    doc.PageSize(PdfPageSize.A4);
                    doc.DocumentMetadata(new DocumentMetadata { Author = "Vahid", Application = "PdfRpt", Keywords = "Test", Subject = "Test Rpt", Title = "Test" });
                })
           .DefaultFonts(fonts =>
           {
               fonts.Path(Environment.GetEnvironmentVariable("SystemRoot") + "\\fonts\\arial.ttf",
                                 Environment.GetEnvironmentVariable("SystemRoot") + "\\fonts\\verdana.ttf");
           })
           .PagesFooter(footer =>
           {
               footer.DefaultFooter(DateTime.Now.ToString("MM/dd/yyyy"));
           })
           .PagesHeader(header =>
           {
               header.DefaultHeader(defaultHeader =>
               {
                   defaultHeader.RunDirection(PdfRunDirection.LeftToRight);

               });
           })
           .MainTableTemplate(template =>
           {
               template.BasicTemplate(BasicTemplate.SilverTemplate);
           }) …