如果存在上一组文件，则将自动增量添加到文件名末尾 [英] Add autoincrement to end of filename if previous set of files exist

问题描述

我需要创建x个文件（一组），但我必须首先检查文件是否存在类似名称。



例如，tiftest1.tif，tiftest2.tif，...存在，我必须再次将tiftest写入同一目录。我想将_x附加到文件名的末尾，其中x是一个自动递增的数字，每次我想要创建该集合。所以我可以有tiftest1_1.tif，tiftest2_1.tif，tiftest1_2.tif，tiftest2_2.tif，tiftest1_3.tif，tiftest2_3.tif等等。



这是什么我到目前为止：

I need to create x number of files (a set) but I must first check to see if the files exist with a similar name.

For example, tiftest1.tif, tiftest2.tif, ... exist and I must write tiftest again to the same directory. I'd like to append _x to the end of the filename, where x is a number that is auto-incremented, each time that I want to create the set. So I can have tiftest1_1.tif,tiftest2_1.tif, tiftest1_2.tif, tiftest2_2.tif, tiftest1_3.tif, tiftest2_3.tif and so forth.

Here is what I have so far:

...
DirectoryInfo root = new DirectoryInfo(fileWatch.Path);
FileInfo[] exist = root.GetFiles(fout + "*.tif");

if (exist.Length > 0)
{
    int cnt = 0;
    do
    {
        cnt++;
	DirectoryInfo root1 = new DirectoryInfo(fileWatch.Path);
        FileInfo[] exist1 = root.GetFiles(fout + "*" + "_" + cnt + ".tif");

        arg_proc = "-o " + "\"" + fileWatch.Path
        + "\\" + fout + "%03d_" + cnt + ".tif\" -r " + "\"" + openDialog.FileName + "\"";
        
    } while (exist1.Length > 0); //exist1 is out of scope so this doesn't work
}
else
{

    arg_proc = "-o " + "\"" + fileWatch.Path
        + "\\" + fout + "%03d.tif\" -r " + "\"" + openDialog.FileName + "\"";
}
...

exists1.length超出范围，因此循环将持续运行。我不确定如何纠正这个问题。我的方法是最初扫描目录以查找匹配项，看看数组的长度是否大于0.如果是> 0然后_x将自动递增，直到找不到匹配项。 arg_proc是函数（未包含）中使用的字符串，它将创建文件。

exist1.length is out of scope so the loop will continually run. I'm not certain how to correct this. My method was to originally scan the directory for a match and see if the length of the array is greater than 0. If it is > 0 then the _x will autoincrement until a match isn't found. arg_proc is a string used in a function (not included) which will create the files.

推荐答案

private static string numberPattern = " ({0})";

   public static string NextAvailableFilename(string path)
   {
       // Short-cut if already available
       if (!File.Exists(path))
           return path;

       // If path has extension then insert the number pattern just before the extension and return next filename
       if (Path.HasExtension(path))
           return GetNextFilename(path.Insert(path.LastIndexOf(Path.GetExtension(path)), numberPattern));

       // Otherwise just append the pattern to the path and return next filename
       return GetNextFilename(path + numberPattern);
   }

   private static string GetNextFilename(string pattern)
   {
       string tmp = string.Format(pattern, 1);
       if (tmp == pattern)
           throw new ArgumentException("The pattern must include an index place-holder", "pattern");

       if (!File.Exists(tmp))
           return tmp; // short-circuit if no matches

       int min = 1, max = 2; // min is inclusive, max is exclusive/untested

       while (File.Exists(string.Format(pattern, max)))
       {
           min = max;
           max *= 2;
       }

       while (max != min + 1)
       {
           int pivot = (max + min) / 2;
           if (File.Exists(string.Format(pattern, pivot)))
               min = pivot;
           else
               max = pivot;
       }

       return string.Format(pattern, max);
   }

见这个帖子： http://stackoverflow.com/questions/1078003/c-how-would-you-make-a-unique- filename-by-adding-a-number [ ^ ]



http://stackoverflow.com//questions/6264098/how-to-increment-the-filename-if -file-already-exist [ ^ ]

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