我必须在保存文件之前追加字符串: [英] i hve to append string before save the file:

问题描述

我必须在保存文件之前附加字符串:
在我的文件夹中，我有很多文件，但是我只从文件夹中过滤掉*.dic 和*.dcm 类型的文件.

但是在保存到硬盘之前，我先附加一些字符串，但是在扩展文件类型*.dic 和*.dcm 之前，我该怎么做:;

i hve to append string before to save the file:
in my folder i hav lot of files but i hve filter out only of type *.dic and *.dcm from folder.

but before save to hard disk i hv to append with some string but before extension of file type *.dic and *.dcm how can i do that:;

string lookfor = "*.dic;*.dcm";
            string[] extension = lookfor.Split(new char[] { ';' });
            ArrayList mylist = new ArrayList();
            DirectoryInfo di = new DirectoryInfo(txtInputFilePath.Text);
           

            foreach (string ext in extension)
            {
                mylist.AddRange(di.GetFiles(ext));

                foreach (FileInfo fi in mylist)
                {              
                    string r = fi.FullName.ToString();                    
                    MessageBox.Show(r.ToString());
                }
            }

推荐答案

更好的解决方案是使用子字符串:

A better solution is to use substring:

foreach (string ext in extension)
    {
    mylist.AddRange(di.GetFiles(ext));

    foreach (FileInfo fi in mylist)
        {
        string r = fi.FullName.ToString();
        int lastDot = r.LastIndexOf('.');
        r = r.Substring(0, lastDot) + "hello" + r.Substring(lastDot);
        MessageBox.Show(r.ToString());
        }
    }

尝试通过更改此块..

try by altering this block..

foreach (string ext in extension)
{
    mylist.AddRange(di.GetFiles(ext));

    foreach (FileInfo fi in mylist)
    {              
       string r = fi.FullName.ToString();   
                    
       // newly added lines

      string[] parts = r.Split('.');
      parts[parts.Length-1] +="your text";
                    
      r=string.Empty;
      int i=0;
      for(i=0;i<parts.length-2;i++)>
      {
         r += parts[i]; 
      }

      r += "." + parts[i];
                                    
      MessageBox.Show(r.ToString());
    }
 }

希望这会有所帮助.

hope this helps..

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