使用File.WriteAllBytes写入文件时访问此函数创建的文件时出错

Question

我使用了以下代码，它运行正常。但有时会抛出异常：

Message :- The process cannot access the file   'DownloadDB\client\user\filename.db' because it is being used by another process.

Stack Trace :- 
at System.IO.File.InternalDelete(String path, Boolean checkHost)
at System.IO.File.Delete(String path)
at Ionic.Zip.ZipEntry.InternalExtract(String baseDir, Stream outstream,    String password)
at Ionic.Zip.ZipEntry.Extract(String baseDirectory)
at Ionic.Zip.ZipFile._InternalExtractAll(String path, Boolean overrideExtractExistingProperty)
at Ionic.Zip.ZipFile.ExtractAll(String path, ExtractExistingFileAction extractExistingFile)
at ecpMobileToWebSync.UnZipFiles(String strZipFilePath, String CombinePath, String fk_EmpGLCode)

我的代码如下：

    private string SyncDB(string FileArray)
    {
        string pathNew = "";
        byte[] encodedDataAsBytesSyncDB = System.Convert.FromBase64String(FileArray);
        pathNew = Server.MapPath("~/SyncDB/" + strClientName_File + "/" + UserName + "/" + Filename);
        File.WriteAllBytes(pathNew, encodedDataAsBytesSyncDB);

        byte[] encodedDataAsBytesDownloadDB = System.Convert.FromBase64String(FileArray);
        pathNew = Server.MapPath("~/DownloadDB/" + strClientName_File + "/" + UserName + "/" + Filename);
        File.WriteAllBytes(pathNew, encodedDataAsBytesDownloadDB);

        encodedDataAsBytesSyncDB = null;
        encodedDataAsBytesDownloadDB = null;
        FileArray = null;

        string strFileName = string.Empty;
        if (File.Exists(pathNew))
        {
            strFileName = UnZipFiles(pathNew, Server.MapPath("~/DownloadDB/" + strClientName_File + "/" + UserName + "/"));
        }

    }
    private string UnZipFiles(string strZipFilePath, string CombinePath)
    {
        string strZilEntryFileName = string.Empty;
        ReturnData objReturnData = new ReturnData();
        objReturnData.isValid = true;
        objReturnData.Message = "";
        try
        {
            using (ZipFile zip1 = ZipFile.Read(strZipFilePath))
            {
                strZilEntryFileName = zip1.Entries.Single().FileName;
                var flattenFoldersOnExtract = zip1.FlattenFoldersOnExtract;
                zip1.FlattenFoldersOnExtract = true;
                zip1.ExtractAll(CombinePath, ExtractExistingFileAction.OverwriteSilently);
                zip1.FlattenFoldersOnExtract = flattenFoldersOnExtract;
            }
        }
        catch (Exception ex)
        {
            ErrorLogDetails.LogException(this.GetType().Name.ToString(), System.Reflection.MethodBase.GetCurrentMethod().Name.ToString());
            objReturnData.isValid = false;
            objReturnData.Message = MsgException_Failure;
        }
        return strZilEntryFileName;
    }

在这段代码中，我从客户端获取一个zip文件的字节数组，然后我执行逆向工程，将字节数组转换为zip文件，然后将其解压缩。

首先，我将使用字节数组调用SyncDB函数，然后调用UnZipFiles来解压缩文件。

这一切都很好，但在某些情况下会有例外。