Return value list of string

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I'm trying to get the result of the ImageDescr List, visible on the whole page.
e. g.: I press a Button and read the index (n) of the ImageDescr List to display the value.

What I have tried:

<pre>protected void Page_Load(object sender, EventArgs e)
 {
    ....
    ImageDescription ImageDescr = new ImageDescription();
   
    //ImageDescr is declared public in the class ImageDescription
    //after execute not see the element ImageDescr = null
    //
 }

Class for full List , read string from Directory

public class ImageDescription
    {
        private string virtualPath;
        private string physicalPath;

        public List<string> ImageDescr { get; set; }

        public ImageDescription()
        {
            // from other class
            PathImages pImg = new PathImages();
            virtualPath = pImg.path1;
            physicalPath = pImg.path2;

            List<string> ImageDescr = new List<string>();

            try
            {
                var imagesFolder = new DirectoryInfo(physicalPath);
                foreach (var item in imagesFolder.EnumerateFiles())
                {
                    if (item is FileInfo)
                    {
                        //add virtual path of the image to the images list
                        ImageDescr.Add(string.Format("{0}/{1}", virtualPath, item.Name));
                    }
                }

                //the List ImageDescr is is correctly filled
            }
            catch (Exception ex)
            {
                //log exception
                //Logger.Log(ex.Message);
            }

        }        
    }

Posted 23-Jan-18 4:45am

Member 13174280

Updated 25-Jan-18 5:39am

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OriginalGriff · Answer 1 · 2018-01-23T05:14:00

Um. You do realize that the version you populated masks the class level version:

C#

public List<string> ImageDescr { get; set; }

        public ImageDescription()
        {
...
            List<string> ImageDescr = new List<string>();

            try
            {
...
                        ImageDescr.Add(string.Format("{0}/{1}", virtualPath, item.Name));
...
            }
         }

And what that means is that the data you filled in is discarded when the constructor exists, leaving the public version of ImageDescr unassigned and null?
I'd suggest that you start by following C# naming conventions, or assign the value instead of using a new variable:

C#

        public List<string> ImageDescr { get; set; }

        public ImageDescription()
        {
...
            ImageDescr = new List<string>();

            try
            {

Member 13174280 · Answer 2 · 2018-01-24T07:08:00

public partial class _Default : System.Web.UI.Page
{
    .........
    public List<string> ImgDes = new List<string>();

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
          ............
          GetNameImage();
        }
    }


 protected void GetNameImage()
    {
        PathDesc = MapPath(virtualPath + "/" + "DescrImages.txt");

        if (File.Exists(PathDesc))
        {
            using (var sr = new StreamReader(PathDesc))
            {
                string line = "";
                while ((line = sr.ReadLine()) != null)
                {
                    NameImage.ImgName.Add(line);
                }

                sr.Close();
            }

        ImgDes = NameImage.ImgName.ToList();
    }

public static class NameImage
    {
        public static List<string> ImgName = new List<string>();

    }
}

Member 13174280 · Answer 3 · 2018-01-25T05:39:00

Solution 3

my solution is not perfect:
with Scriptmanager + UpdatePanel
the data stored in the List ImgDes is lost when i click on an image of the DataList to perform other operations on the same page

without UpdatePanel ImgDes remaining usable in every part of the page.

Posted 25-Jan-18 5:39am

Member 13174280

Return value list of string

3 solutions

Solution 1

Solution 2

Solution 3

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