我如何添加到列表中<FileInfo>还有每个文件的大小作为文本？

Question

files = new DirectoryInfo(@"d:\").GetFiles("*.avi").Where(f => f.Length <= 70 * 1024 * 1024).ToList();

For example the first item I see it now in the List like:

{test.avi} 

How can I make that I will see also the size of each file, something like:

{test.avi} {23MB}

Answer 1

First of all, files will be a List<FileInfo> , not a List<string> . To convert the FileInfo into a string of your own choice, use Select :

files = new DirectoryInfo(@"d:\").GetFiles("*.avi").Where(f => f.Length <= 70 * 1024 * 1024).Select(f => f.Name + " " + (f.Length / 1048576) + " MB").ToList();

If you need more options (say, kB) the code inside the Select will be more complicated. An often forgotten feature of LINQ is that you can use complete delegates inside LINQ methods:

.Select((f) => {
    var s = f.Name + " ";
    if (f.Length > 1048576) {
        return s + (f.Length / 1048576) + " MB";
    } else {
        return s + (f.Length / 1024) + " kB";
    }
})

Answer 2

files = new DirectoryInfo(@"d:\").GetFiles("*.avi").Where(f => f.Length <= 70 * 1024 * 1024).Select(f=> new {f.Name,f.Length})).ToList();