在使用Ionic.Zip.ZipFile保存到磁盘之前，如何获取zip文件的大小？

Question

I am usig Ionic.Zip.ZipFile.I want to create 10 mb zip file.I need get size of ZipFile before save to disk.Is it possible ?

    private static string tempPath = "@Temp Folder";
    List<string> fileNames = new List<string>();


    using (Ionic.Zip.ZipFile zf = new Ionic.Zip.ZipFile())
    {
      for (int i = 0; i < fileNames.Count; i++)
      {
        zf.AddFile(tempPath + fileNames[i], string.Empty);

        //How can I get size of zf before save here ?

      if(zf size==10mb)
      {

       zf.Save(tempPath + string.Format("{0}-{1}-{2}.zip","XXX", "XXX", 
          DateTime.Now.ToString("yyyyMMdd")));
      }

     }
   }

Answer 1

You can save your zip into a MemoryStream :

var ms = new MemoryStream();
zip.Save(ms);

then read the MemoryStream.Length Property and get the size.

If you then still want to save it to disk just use the memory stream you already have:

FileStream file = new FileStream("file.zip", FileMode.Create, FileAccess.Write);
// I believe you'll need to rewind the stream before saving
ms.Seek(0, SeekOrigin.Begin); 
ms.WriteTo(file);
file.Close();
ms.Close();