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arraylist images from directory sorting by filename

Posted on 2009-03-31
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Last Modified: 2012-05-06
I am using c# with asp.net to fill an arraylist with images (jpg) that are in a directory.  i am using the filesystem to upload images to a directory and i am renaming them with a date_time stamp as the file name.  ie  
03202009_10_22_13_pm.jpg
03122009_11_29_05_am.jpg
03312009_1_15_45_pm.jpg
how can i display the arraylist in a datalist sorting by FILE NAME?


if (Directory.Exists(Server.MapPath(strPath)))
        {
            DirectoryInfo dirInfoImages = new DirectoryInfo(Server.MapPath(strPath));
            ArrayList listImages = new ArrayList();
            listImages.AddRange(dirInfoImages.GetFiles("*.jpg"));
            listImages.AddRange(dirInfoImages.GetFiles("*.jpeg"));                        
            DL_Images.DataSource = listImages;
            DL_Images.DataBind();            
        }

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Question by:cay187
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 24032519
What version C# you working with?
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Author Comment

by:cay187
ID: 24032538
.net 3.5
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Accepted Solution

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Mike Tomlinson earned 500 total points
ID: 24033038
Try something like this:

        ...
            if (Directory.Exists(Server.MapPath(strPath)))
            {
                DirectoryInfo dirInfoImages = new DirectoryInfo(Server.MapPath(strPath));
                List<FileInfo> listImages = new List<FileInfo>();
                listImages.AddRange(dirInfoImages.GetFiles("*.jpg"));
                listImages.AddRange(dirInfoImages.GetFiles("*.jpeg"));
                listImages.Sort(CompareFileInfos);
                DL_Images.DataSource = listImages;
                DL_Images.DataBind();
            }

With the helper method:

        private int CompareFileInfos(FileInfo fiA, FileInfo fiB)
        {
            return fiA.Name.CompareTo(fiB.Name);
        }

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Author Comment

by:cay187
ID: 24035542
List<FileInfo> listImages = new List<FileInfo>();
you are way more advanced at arrays than i am.  you suggest i replace
ArrayList listImages = new ArrayList();
with
List<FileInfo> listImages = new List<FileInfo>();?
what is<FileInfo>?
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 24035704
The List is basically a TYPE-SAFE, dynamic array.  The <FileInfo> part is telling it what Type of data will be in the list.
See Generic List: http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx

An ArrayList is a dynamic list that accepts anything because it takes Object.  So you were actually placing FileInfo instances into your ArrayList with your old code because DirectoryInfo.GetFiles() returns an Array of FileInfo.
See DirectoryInfo.GetFiles(): http://msdn.microsoft.com/en-us/library/8he88b63.aspx

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Author Comment

by:cay187
ID: 24059082
i will try this today
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Author Closing Comment

by:cay187
ID: 31565001
That did it.  Thank you very much!!
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