c# - 覆盖 ZipArchiveEntry 的内容

Question

如何覆盖 ZipArchiveEntry 的内容？如果新文件内容比原始文件内容短，则以下使用 StreamWriter 和 StringBuilder 的代码将失败，例如:

using System.IO.Compression;
//...
using (var archive = ZipFile.Open("Test.zip", ZipArchiveMode.Update))
{
   StringBuilder document;
   var entry = archive.GetEntry("foo.txt");//entry contents "foobar123"
   using (StreamReader reader = new StreamReader(entry.Open()))
   {
      document = new StringBuilder(reader.ReadToEnd());
   }

   document.Replace("foobar", "baz"); //builder contents "baz123"

   using (StreamWriter writer = new StreamWriter(entry.Open()))
   {
      writer.Write(document); //entry contents "baz123123", expected "baz123"
   }
}

生成包含新旧内容混合的文件“baz123123”而不是预期的“baz123”。有没有办法在写入新内容之前丢弃 ZipArchiveEntry 的旧内容？
注意:我不想提取文件，我想更改存档的内容。

Answer 1

另一种方法是 entry.Open() 流的 SetLength(document.Length)。

using(var stream = entry.Open())
{
   stream.SetLength(document.Length);
   using (StreamWriter writer = new StreamWriter(stream))
   {
      writer.Write(document); //entry contents "baz123"
   }
}