如何对特定文件进行排序和删除

您可以使用Regex解析数据的文件名，并使用Linq获取Duplicates或Distinct记录。

POCO:

public class FileData
{
    public string Original { get; set; }
    public string Type { get; set; }
    public string Name { get; set; }
    public int Weight { get { return GetWeight(Type); } }
    private static int GetWeight(string option)
    {
        // This will put the files in order by pdf, doc, txt, etc
        switch(option)
        {
            case "pdf":
                return 0;
            case "doc":
                return 1;
            case "txt":
                return 2;
            default:
                return 3;
        }
    }
}

您将需要一个权重函数，因为默认的OrderBy将按字母顺序工作。通过这种方式，您可以指定哪些文件更有意义。

代码：

// you can substitute this with Directory.GetFiles
// e.g. var files = Directory.GetFiles("Path/To/Files");
var files = new []
{
    "BkUpSalesReportJan2011(txt).zip",
    "BkUpSalesReportJan2011(pdf).zip",
    "BkUpSalesReportJan2011(doc).zip",
    "BkUpSalesReportFeb2011(txt).zip",
    "BkUpSalesReportMar2011(doc).zip",
    "BkUpSalesReportMar2011(pdf).zip"
};
var pattern = @"(?<FileName>.+)'((?<FileType>'w+)')'.zip";
// (?<FileName>.+) Match the first part in a named group
// '( Match the first open parenthesis
// (?<FileType>'w+) Match the txt/pdf/doc/whatever in a named group
// ') Match the closing parenthesis
// '.zip Match a period followed by the zip
var matchedFiles = files.Select(f => Regex.Match(f, pattern))
                        .Where(m => m.Success)
                        .Select(f =>
                            new FileData
                                {
                                    Type = f.Groups["FileType"].Value,
                                    Name = f.Groups["FileName"].Value,
                                    Original = f.Value
                                }
                               ).ToList();
// Group all the files by the name e.g. BkUpSalesReportJan2011
// Transform the group into order and take the first record
// Take the original file name to get the originals
var distinct = matchedFiles.GroupBy(f => f.Name)
                           .Select(g => g.OrderBy(f => f.Weight).First())
                           .Select(f => f.Original);
// Group all the files by the name e.g. BkUpSalesReportJan2011
// Transform the group into order and skip the first record
// Since the records are still in a nested IEnumerable we need to flatten it
// Take the original file name to get the duplicates
var duplicates = matchedFiles.GroupBy(f => f.Name)
                             .Select(g => g.OrderBy(f => f.Weight).Skip(1))
                             .SelectMany(g => g)
                             .Select(f => f.Original);

另请参阅：

Directory.GetFiles