Question

in my program i have a datagridview,populated with 2 columns.
frist columns contains value like as filename.ext
second column contains size of this file.

now,i need to compare if file listed in column are present or not in a selected folder(selected by openfolder dialog)

i think have to use

DirectoryInfo di = new DirectoryInfo(fldChk.SelectedPath);
                FileInfo[] rgFiles = di.GetFiles("*.*");

                foreach (FileInfo file in rgFiles)
                  { //do there

i think use 2 array list,then add in frist filename,in second filesize.but is only supposition and for folder with many file,is very slow process.
what are best way to do thath?

Answer 1

You don’t need to create a FileInfo object to detect whether a file at a particular path exists. Just use the System.IO.File.Exists method. If the path in the first column is a relative path, you’ll have to prepend the absolute path to the path in the column before you call the Exists method.

var path = column.Text; // or wherever you get the path from
path = Path.Combine(@"C:\absolute\path\", path);
if (File.Exists(path))
{
   // Do something
}