我在編寫一個靜態的Deflate擴展方法時遇到麻煩,我會用它來解壓一個字符串,使用SharpZipLib庫的BZip2 alghorithm(運行時版本:v2.0.50727)。用SharpZipLib縮小流在C#與VB.NET中有不同的行爲
我使用.NET框架4.
這是我的VB.NET代碼做:
Public Function Deflate(ByVal text As String)
Try
Dim compressedData As Byte() = Convert.FromBase64String(text)
System.Diagnostics.Debug.WriteLine(String.Concat("Compressed text data size: ", text.Length.ToString()))
System.Diagnostics.Debug.WriteLine(String.Concat("Compressed byte data size: ", compressedData.Length.ToString()))
Using compressedStream As MemoryStream = New MemoryStream(compressedData)
Using decompressionStream As BZip2OutputStream = New BZip2OutputStream(compressedStream)
Dim cleanData() As Byte
Using decompressedStream As MemoryStream = New MemoryStream()
decompressionStream.CopyTo(decompressedStream) // HERE THE ERROR!
cleanData = decompressedStream.ToArray()
End Using
decompressionStream.Close()
compressedStream.Close()
Dim cleanText As String = Encoding.UTF8.GetString(cleanData, 0, cleanData.Length)
System.Diagnostics.Debug.WriteLine(String.Concat("After decompression text data size: ", cleanText.Length.ToString()))
System.Diagnostics.Debug.WriteLine(String.Concat("After decompression byte data size: ", cleanData.Length.ToString()))
Return cleanText
End Using
End Using
Catch
Return String.Empty
End Try
End Function
奇怪的是,我寫的同一方法的C#對應,並它完美的作品!這是代碼:
public static string Deflate(this string text)
{
try
{
byte[] compressedData = Convert.FromBase64String(text);
System.Diagnostics.Debug.WriteLine(String.Concat("Compressed text data size: ", text.Length.ToString()));
System.Diagnostics.Debug.WriteLine(String.Concat("Compressed byte data size: ", compressedData.Length.ToString()));
using (MemoryStream compressedStream = new MemoryStream(compressedData))
using (BZip2InputStream decompressionStream = new BZip2InputStream(compressedStream))
{
byte[] cleanData;
using (MemoryStream decompressedStream = new MemoryStream())
{
decompressionStream.CopyTo(decompressedStream);
cleanData = decompressedStream.ToArray();
}
decompressionStream.Close();
compressedStream.Close();
string cleanText = Encoding.UTF8.GetString(cleanData, 0, cleanData.Length);
System.Diagnostics.Debug.WriteLine(String.Concat("After decompression text data size: ", cleanText.Length.ToString()));
System.Diagnostics.Debug.WriteLine(String.Concat("After decompression byte data size: ", cleanData.Length.ToString()));
return cleanText;
}
}
catch(Exception e)
{
return String.Empty;
}
}
在VB.NET版本中,我收到此錯誤:「流不支持讀取。」 (看代碼瞭解它在哪裏!)
哪裏出錯?我不明白這兩種方法有什麼區別...
非常感謝!
你還沒有說過在VB版本中失敗了什麼...... –
我剛剛編輯了我的問題,謝謝。 – MAXE