尝试从名称匹配\\的单个目录中删除多个文件包含特定字符串

Question

I wish to delete image files. The files are named somefile.jpg and somefile_t.jpg , the file with the _t on the end is the thumbnail. With this delete operation I wish to delete both the thumbnail and original image.

The code works up until the foreach loop, where the GetFiles method returns nothing. The string.Substring operation successfully returns just the file name with no extension and no _t eg: somefile .

There are no invalid characters in the file names I wish to delete. Code looks good to me, only thing I can think of is that I am somehow not using the searchpattern function properly.

filesource = "~/somedir/somefile_t.jpg"

---

var dir = Server.MapPath(filesource);


            FileInfo FileToDelete = new FileInfo(dir);


            if (FileToDelete.Exists) 
            { 
                var FileName = Path.GetFileNameWithoutExtension(FileToDelete.Name);

                foreach(FileInfo file in FileToDelete.Directory.GetFiles(FileName.Substring(0, FileName.Length - 2), SearchOption.TopDirectoryOnly).ToList())
               {
                   file.Delete();
               }

            }

Answer 1

DirectoryInfo.GetFiles Method (String, SearchOption)

You need to ensure that the first parameter, searchPattern , is proper. In you're case you are supplying FileName.Substring(0, FileName.Length - 2) , which would be . The reason the method returns nothing is because you are looking for files literally named somefile. What you meant to do was to use a wildcard in addition to the base filename: String.Concat(FileName.Substring(0, FileName.Length - 2), "*") , which would be ... at least I think you're looking for that searchPattern as opposed to any other one.

Answer 2

This code works for me:

        var file_path = @"K:\Work\IoCToy\IoCToy\image.jpg";
        var dir = Path.GetDirectoryName(file_path);
        var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(file_path);
        var files = Directory.EnumerateFiles(dir, string.Format("{0}*", fileNameWithoutExtension), SearchOption.TopDirectoryOnly);

Of course, you have to delete the files by the returned file names. I am assuming here that your folder contains only the image and the thumbnail file which start with the "image" substring.