C#字符串压缩与解压

public static string CompressString(string str)
{
    var compressBeforeByte = Encoding.GetEncoding("UTF-8").GetBytes(str);
    var compressAfterByte = Compress(compressBeforeByte);
    string compressString = Convert.ToBase64String(compressAfterByte);
    return compressString;
}

public static string DecompressString(string str)
{
    var compressBeforeByte = Convert.FromBase64String(str);
    var compressAfterByte = Decompress(compressBeforeByte);
    string compressString = Encoding.GetEncoding("UTF-8").GetString(compressAfterByte);
    return compressString;
}

/// <summary>
/// Compress
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private static byte[] Compress(byte[] data)
{
    try
    {
    var ms = new MemoryStream();
    var zip = new GZipStream(ms, CompressionMode.Compress, true);
    zip.Write(data, 0, data.Length);
    zip.Close();
    var buffer = new byte[ms.Length];
    ms.Position = 0;
    ms.Read(buffer, 0, buffer.Length);
    ms.Close();
    return buffer;

    }
    catch (Exception e)
    {
    throw new Exception(e.Message);
    }
}

/// <summary>
/// Decompress
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
private static byte[] Decompress(byte[] data)
{
    try
    {
    var ms = new MemoryStream(data);
    var zip = new GZipStream(ms, CompressionMode.Decompress, true);
    var msreader = new MemoryStream();
    var buffer = new byte[0x1000];
    while (true)
    {
        var reader = zip.Read(buffer, 0, buffer.Length);
        if (reader <= 0)
        {
        break;
        }
        msreader.Write(buffer, 0, reader);
    }
    zip.Close();
    ms.Close();
    msreader.Position = 0;
    buffer = msreader.ToArray();
    msreader.Close();
    return buffer;
    }
    catch (Exception e)
    {
    throw new Exception(e.Message);
    }
}