C# - 压缩字节[]

Question

我收到一个 zip 文件 base64 字符串，转换为 byte[]，在内存中打开，修改内容，然后再次“压缩”新的 byte[] 为 base64 字符串。

我的问题是，我不知道如何将新的 byte[] 压缩为 zip 格式。

public string ModifyZipContent(string base64) {
    ZipPackage zipPackage = null;
    MemoryStream memoryStream = null;

    long lenght;

    byte[] data = Convert.FromBase64String(base64);
    byte[] buffer;
    byte[] newData;

    int arrayOffset = 0;

    memoryStream = new MemoryStream();
    memoryStream.Write(data, 0, data.Length);

    zipPackage = (ZipPackage)Package.Open(memoryStream, FileMode.Open);

    PackagePartCollection zipParts = zipPackage.GetParts();

    // this is awful
        foreach(ZipPackagePart zipPart in zipParts) {
            using(Stream stream = zipPart.GetStream()) {
                arrayOffset += (int)stream.Length;
            }
        }

        newData = new byte[arrayOffset];
    // end

    arrayOffset = 0;
    foreach(ZipPackagePart zipPart in zipParts) {
        using(Stream stream = zipPart.GetStream()) {
            lenght = stream.Length;
            buffer = new byte[lenght];

            stream.Read(buffer, 0, (int)lenght);

            Buffer.BlockCopy(buffer, 0, newData, arrayOffset, buffer.Length);
            arrayOffset += buffer.Length;
        }
    }

    return Convert.ToBase64String(newData);
}

Answer 1

我还没有完全测试过这个，但是按照这些思路应该可以工作......

// Requires System.IO.Compression using statement.

byte[] bytes = new byte[256]; // Your byte[] would be here instead of this empty one.
using (var zipFile = ZipFile.Open("C:/ZipFile.zip", ZipArchiveMode.Update))
{
    var entry = zipFile.CreateEntry("YourEntryPathHere");
    using (var stream = entry.Open())
    {
        stream.Write(bytes, 0, bytes.Length);
    }
}