关于文件的FileInfo抛出错误

Question

I have the following code

            string[] dfFileWildCards = Helper.DataFeedsWildCards.Split(',');
            string[] dfOriginalFilesPath = Directory.GetFiles(Helper.DataFeedsPath).Where(file => new FileInfo(file).CreationTime.Date == DateTime.Now.Date).ToArray();

            Helper.MyWriteLine("-->DataFeeds Folder: " + Helper.DataFeedsPath);
            Helper.MyWriteLine("-->WildCards: " + Helper.DataFeedsWildCards);
            Helper.MyWriteLine("-->There are " + dfOriginalFilesPath.Length + " files");

            foreach (string filePath in dfOriginalFilesPath)
            {
                Helper.MyWriteLine("Checking " + filePath.ToLower());
                FileInfo file = new FileInfo(filePath.ToLower());

                foreach (string dfFileWildCard in dfFileWildCards)
                {
                    if (
                        file.Replace(" ", "").Name.IndexOf(dfFileWildCard.Replace(" ", ""), StringComparison.OrdinalIgnoreCase) > -1
                        &&
                        file.LastWriteTime.Date == DateTime.Now.Date
                        )
                    {
                        filesToCopy.Add(filePath.ToLower());
                        Helper.MyWriteLine("---->Marked for copy " + file.Name + ".");
                    }
                }
            }

It is showing error in log for d:\\cnbrd\\datafeeds\\authorizeddatafeedfile_20121127.txt

11/28/2012 1:27:53 AM -->DataFeeds Folder: D:\CNBRD\DataFeeds
11/28/2012 1:27:53 AM -->WildCards: Inactive
11/28/2012 1:27:53 AM -->There are 7 files
11/28/2012 1:27:53 AM Checking d:\cnbrd\datafeeds\authorizeddatafeedfile_20121127.txt
11/28/2012 1:27:53 AM Exception occured: The path is not of a legal form.

Why is it so ?

Answer 1

The problem is here:

file.Replace(" ", "").Name.IndexOf(dfFileWildCard.Replace(" ", ""), StringComparison.OrdinalIgnoreCase) > -1

Should probably be:

file.Name.Replace(" ", "").IndexOf(dfFileWildCard.Replace(" ", ""), StringComparison.OrdinalIgnoreCase) > -1

Notice I'm calling Replace on file.Name .

Answer 2

I'm pretty sure it is in this code block:

if (
    file.Replace(" ", "").Name.IndexOf(dfFileWildCard.Replace(" ", ""), StringComparison.OrdinalIgnoreCase) > -1
    &&
    file.LastWriteTime.Date == DateTime.Now.Date
    )

Since you are doing file.Replace(...) you are calling this method, which actually replaces contents of files, and in this case, creating a backup file, which will fail since the specified backup file in "". I think you are trying to read the name of the file? If that is the case, then the following might be what you need.

if (
    file.Name.Replace(" ", "").Name.IndexOf(dfFileWildCard.Replace(" ", ""), StringComparison.OrdinalIgnoreCase) > -1
    &&
    file.LastWriteTime.Date == DateTime.Now.Date
    )