Getting FileInfo[]

[John Bowman]

Hi All,

..NET 1.1... I'm wondering if there is any approach more convenient to get a
list of FileInfo objects than the following. For example, if I wanted to get
1 list of all the Exe's and all the Dll's and all the Txt's in a folder, if
appears I need to do something like the following:

ArrayList InterestingFile s = new ArrayList();
DirectoryInfo di = new DirectoryInfo(@ "C:\My Folder");

FileInfo[] EXEs = di.GetFiles("*. exe");
FileInfo[] DLLs = di.GetFiles("*. dll");
FileInfo[] TXTs = di.GetFiles("*. txt");

InterestingFile s.AddRange(EXEs );
InterestingFile s.AddRange(DLLs );
InterestingFile s.AddRange(TXTs );

foreach(FileInf o fi in InterestingFile s)
{
MessageBox.Show (fi.Name);
}

It would be really cool if the GetFiles method accepted an array of
searchPatterns to accomplish this in 1 line instead of 6... but alas I can
not find anything like the following.
eg,

string[] exts = {"*.exe", "*.dll", "*.txt"}
FileInfo[] AllInterestingF iles = di.GetFiles(ext s);

This would be especially more convenient when the list of file extensions we
cared about was rather long. I suppose I could write a simple
FileInfoCollect ion class whose constructor accepted the array of exts and a
path, but that sort of seems like overkill. Anyone have any better ideas?

I realize that I probably should use a collection of FileInfo objects
instead of an array list for the real thing, but for this example purpose
I'm being lazy <g>.

TIA,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[Nicholas Paldino [.NET/C# MVP]]

John,

This would seem to be the best way. If you encapsulated it into a
function that has a params argument, you could actually do this:

public static FileInfo[] FindFiles(Direc toryInfo directory, params string[]
extensions)
{
// The values to return.
ArrayList retVal = new ArrayList();

// Cycle through the extensions, and add to a return value.
foreach (string extension in extensions)
{
// Find the files, and add to the return value.
retVal.AddRange (directory.GetF iles(extension) );
}

// Return the array.
return (FileInfo[]) retVal.ToArray( typeof(FileInfo ));
}

Then, you could just do:

foreach(FileInf o fi in FindFiles(new DirectoryInfo(@ "C:\My Folder"),
"*.exe", "*.dll", "*.txt"))
{
MessageBox.Show (fi.Name);
}

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"John Bowman jo*********@the rmo.com>" <<Remove this before reply> wrote in
message news:%2******** ********@TK2MSF TNGP14.phx.gbl. ..

Hi All,

.NET 1.1... I'm wondering if there is any approach more convenient to get
a list of FileInfo objects than the following. For example, if I wanted to
get 1 list of all the Exe's and all the Dll's and all the Txt's in a
folder, if appears I need to do something like the following:

ArrayList InterestingFile s = new ArrayList();
DirectoryInfo di = new DirectoryInfo(@ "C:\My Folder");

FileInfo[] EXEs = di.GetFiles("*. exe");
FileInfo[] DLLs = di.GetFiles("*. dll");
FileInfo[] TXTs = di.GetFiles("*. txt");

InterestingFile s.AddRange(EXEs );
InterestingFile s.AddRange(DLLs );
InterestingFile s.AddRange(TXTs );

foreach(FileInf o fi in InterestingFile s)
{
MessageBox.Show (fi.Name);
}

It would be really cool if the GetFiles method accepted an array of
searchPatterns to accomplish this in 1 line instead of 6... but alas I can
not find anything like the following.
eg,

string[] exts = {"*.exe", "*.dll", "*.txt"}
FileInfo[] AllInterestingF iles = di.GetFiles(ext s);

This would be especially more convenient when the list of file extensions
we cared about was rather long. I suppose I could write a simple
FileInfoCollect ion class whose constructor accepted the array of exts and
a path, but that sort of seems like overkill. Anyone have any better
ideas?

I realize that I probably should use a collection of FileInfo objects
instead of an array list for the real thing, but for this example purpose
I'm being lazy <g>.

TIA,

--
John C. Bowman
Software Engineer
Thermo Electron Scientific Instruments Div.
<Remove this before reply> jo*********@the rmo.com

[Mattias Sjögren]

John,

Anyone have any better ideas?

How about enumerating all files and then filter out the interesting
ones yourself?
Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
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