从文件夹 c# 生成多个较小的 zip 文件

Question

我有一个文件夹，其中包含我必须通过慢速网络复制的文件。

我按如下方式生成 zip。

    string path = @".\Files";
    string zipPath = @".\transfer.zip";

    ZipFile.CreateFromDirectory(path , zipPath);

生成的 zip 文件为 10GB，复制单个文件很慢。我想为最大 1GB 的文件夹生成 zip 文件，所以在这种情况下它将生成 10 个。

有没有办法在 C# 中做到这一点

Answer 1

我只是把它放在一起并测试了它。这有点粗糙，但我只是暂时下班休息。请注意，它跟踪原始文件大小而不是压缩文件大小。因此，它会占用多达 1GB 的原始文件并对其进行转换，然后继续处理其余文件。

        //maximum size in bytes (1gb)
        long maxSize = 1073741824;                                      
        string path = @".\Files";
        string zipPath = @".\transfer.zip";
        //keep track of sum of sizes of raw files to be zipped.
        long currentSize = 0;
        //get list of files to iterate through.
        string[] filesToCompress = Directory.GetFiles(path, "*.*");
        //declare file counter so you don't duplicate filenames.
        int fileCounter = 1;
        //create empty list to store file paths to be zipped.
        List<string> zipMe = new List<string>();
        string zipName = string.Empty;
        foreach (string file in filesToCompress)
        {
            zipName = "myfile_" + fileCounter + ".zip";
            FileInfo f = new FileInfo(file);
            if ((f.Length + currentSize) >= maxSize)
            {
                //create zip file
                using (ZipArchive newFile = ZipFile.Open(zipPath+zipName, ZipArchiveMode.Create))
                {
                    foreach (string item in zipMe)
                    {
                        newFile.CreateEntryFromFile(item, item.Replace(path + "\\", ""));
                    }
                }
                //clear the list
                zipMe.Clear();
                //add the file that would have put it over the file size limit to the beginning of the next list.
                zipMe.Add(f.FullName);
                //increase counter for filename.
                fileCounter++;
                //set currentsize equal to the file's size we just added to the list.
                currentSize = f.Length;
            }
            else
            {
                //Haven't hit 1gb yet...add file's length to current length as well as add it to the list and keep on going!
                currentSize = currentSize + f.Length;
                zipMe.Add(f.FullName);
            }               
        }
        //Loop is done, let's clear up any files left over in the list that didne't exceed our file size limit.
        if (zipMe.Count > 0)
        {
            using (ZipArchive newFile = ZipFile.Open(zipPath + zipName, ZipArchiveMode.Create))
            {
                foreach (string item in zipMe)
                {
                    newFile.CreateEntryFromFile(item, item.Replace(path + "\\", ""));
                }
            }
        }

Answer 2

你可以看看这个：https://docs.microsoft.com/en-us/dotnet/api/system.io.packaging?redirectedfrom=MSDN&view=dotnet-plat-ext-3.1

它的类支持在一个容器中存储多个对象。

另一个例子可以在这里找到：https://www.c-sharpcorner.com/blogs/create-a-multi-zip-file-from-a-large-file-and-upload-one-part-at-a-time1