System.IO.IOException:进程无法访问文件'file_name'

Question

我的Windows服务中有一个方法如下:

System.IO.File.Copy(path, ConfigurationManager.AppSettings["BulkInsertGiftRegisterCreatorDirectory"] + System.IO.Path.GetFileName(path));

Loyalty.Entity.Base.FileInfo file = new Loyalty.Entity.Base.FileInfo();
file.FileName = path;
request.Object = file;

ResponseBase response = new ResponseBase(request);
RequestConnection connection = new RequestConnection("cn");
FileManager fileManager = new FileManager(request, connection);
response = fileManager.OfflineGiftRegisterBulkInsert();

System.IO.File.Delete(ConfigurationManager.AppSettings["BulkInsertGiftRegisterCreatorDirectory"] + System.IO.Path.GetFileName(path));

// here is the part of stored procedure that uses file
SELECT @SCRIPT= 'BULK INSERT GIFT_CARD.GIFT_TEMP'
                            +' FROM '''
                            + @FILE_PATH
                            +''' WITH ('
                                 +'FIELDTERMINATOR = '','','
                                 + 'KEEPNULLS'
                            +');'

我可以手动从文件系统中删除该文件,但是这段代码告诉我"Ooops!System.IO.IOException:进程无法访问文件'filename',因为它正由另一个进程使用."

我在stackoverflow和其他地方搜索了类似的问题.但我找不到任何可以帮助我的东西.复制或删除方法返回void,我的代码中没有要处理的流.

我该如何解决？

提前致谢.

Answer 1

这是一种检查文件是否正在使用的方法:

public static System.Boolean FileInUse(System.String file)
{
    try
    {
        if (!System.IO.File.Exists(file)) // The path might also be invalid.
        {
            return false;
        }

        using (System.IO.FileStream stream = new System.IO.FileStream(file, System.IO.FileMode.Open))
        {
            return false;
        }
    }
    catch
    {
        return true;
    }
}

另外,要等待我制作的文件:

public static void WaitForFile(System.String file)
{
    // While the file is in use...
    while (FileInUse(file)) ; // Do nothing.
}

我希望这有帮助!