c＃寻找API读取7z标头

Question

Is there c# based API for 7zip (7z) that supports the ability to read its header to retrieve the CRC information for each file in the compressed archive? Everything I have looked at requires you to decompress the file. I am writing an application that compares the CRCs of the files in a compressed folder with a separate list.

I currently am using DotNetZip for zip files and it works great. Unfortunately it has no .7z support.

EDIT: Exception generated when calling ZipFile.Read()

{Ionic.Zip.ZipException: Cannot read that as a ZipFile ---> Ionic.Zip.BadReadException:   Bad signature (0xAFBC7A37) at position  0x00000000
   at Ionic.Zip.ZipEntry.ReadHeader(ZipEntry ze, Encoding defaultEncoding)
   at Ionic.Zip.ZipEntry.ReadEntry(ZipContainer zc, Boolean first)
   at Ionic.Zip.ZipFile.ReadIntoInstance_Orig(ZipFile zf)
   at Ionic.Zip.ZipFile.ReadIntoInstance(ZipFile zf)
   --- End of inner exception stack trace ---
   at Ionic.Zip.ZipFile.ReadIntoInstance(ZipFile zf)
   at Ionic.Zip.ZipFile.Read(String fileName, TextWriter statusMessageWriter, Encoding encoding, EventHandler`1 readProgress)
   at Ionic.Zip.ZipFile.Read(String fileName)

...

Answer 1

This sounds like a duplicate post.. here look at some of the answers on this StackOverFlow Link Reading 7z files

This should work for you if you are using DotNetZip try this example below

using (ZipFile zip = ZipFile.Read(ExistingZipFile))
{
  foreach (ZipEntry ze in zip)
  {
    if (header)
    {
      System.Console.WriteLine("Zipfile: {0}", zip.Name);
      if ((zip.Comment != null) && (zip.Comment != "")) 
        System.Console.WriteLine("Comment: {0}", zip.Comment);
      System.Console.WriteLine("\n{1,-22} {2,8}  {3,5}   {4,8}  {5,3} {0}",
                               "Filename", "Modified", "Size", "Ratio", "Packed", "pw?");
      System.Console.WriteLine(new System.String('-', 72));
      header = false;
    }
    System.Console.WriteLine("{1,-22} {2,8} {3,5:F0}%   {4,8}  {5,3} {0}",
                             ze.FileName,
                             ze.LastModified.ToString("yyyy-MM-dd HH:mm:ss"),
                             ze.UncompressedSize,
                             ze.CompressionRatio,
                             ze.CompressedSize,
                             (ze.UsesEncryption) ? "Y" : "N");

  }
}