Question

我有一个目录。在这个目录中有很多不同的文件。我只需要缩略图。所以我写了一个正则表达式来匹配这些文件。

然后，让所有这些匹配文件 - 我想创建一个字典：

密钥作为文件名中提取的数字（匹配的数字 - 见下面的代码）

值为Image

    public readonly IReadOnlyDictionary<int, Image> thumbnails;

    ItemData(string directory)
    {
        this.directory = directory;

        var files = Directory.GetFiles(directory);

        Regex r = new Regex(directory + "\\thumbnail-([0-9]+).jpg", RegexOptions.RightToLeft);

        List<int> sizes = new List<int>();
        List<Image> images = new List<Image>();

        for (int i = 0; i < files.Count(); i++)
        {
            string result = r.Match(files[i]).Groups[1].Value;
            if (result != "")
            {
                sizes.Add(Int32.Parse(result));
                images.Add(Image.FromFile(files[i]));
            }
        }

        thumbnails = sizes.Zip(images, (s, i) => new {s, i}).ToDictionary(item => item.s, item => item.i);
    }

我真的相信这可以用非常简短明了的方式写出来。你能帮我吗？

已编辑的解决方案

public readonly Dictionary<int, Image> thumbnails;

public ItemData(string directory)
{
    Regex r = new Regex("^thumbnail-([0-9]+)$", RegexOptions.RightToLeft);

    thumbnails =
        Directory.GetFiles(directory)
        .Select(f => new
        {
            file = f,
            match = r.Match(Path.GetFileNameWithoutExtension(f))
        })
        .Where(x => x.match.Success)
        .Select(x => new
        {
            size = Int32.Parse(x.match.Groups[1].Value),
            image = Image.FromFile(Path.Combine(directory, x.file))
        })
        .ToDictionary(x => x.size, x => x.image);
}

Answer 1

这是我能想到的最好的：

public void ItemData(string directory)
{
    var r = new Regex(directory + "\\thumbnail-([0-9]+).jpg", RegexOptions.RightToLeft);

    thumbnails =
        Directory
            .GetFiles(this.directory)
            .Select(f => new
            {
                file = f,
                result = r.Match(f).Groups[1].Value
            })
            .Where(x => x.result != "")
            .Select(x => new
            { 
                size = Int32.Parse(x.result),
                image = Image.FromFile(x.file)
            })
            .ToDictionary(x => x.size, x => x.image);
}

我必须将IReadOnlyDictionary<int, Image>更改为IDictionary<int, Image>才能使作业完成。

C＃中的聪明的正则表达式和LINQ

1 个答案: