How to match items in listview and images in imagelist

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This is my first time to post and I'm non-native speaker of English, so no flames about my bad English please.

I'm using visual studio 11 and making a windows form application like a pdf file management software. Now, I can add pdf files to listveiw and save the top page of pdf files in imagelist as a thumbnail.

But I have no idea to match images in imagelist and items in listview.

When adding items in listview, I matched the number of items and index of imagelist and I seemed to make the function, but if I remove items, the corresponding image should be removed but I don't know how to do this. (Is this best way?)

C#

int VolNum = listView1.Items.Count; //counting items in listview1
ListViewItem itm = listView1.Items.Add(fileName, VolNum); //match items(fileName) and images in imagelist

Moreover, I export items in listview to CSV, and load the CSV file on start-up. Please tell me how to match items in listview and images in imagelist.
I use this code to read CSV.

C#

StreamReader srInf = new StreamReader(@"C:\data.csv");

  String filedata;

  while ((filedata = srInf.ReadLine()) != null)
  {

      string[] csvdata = filedata.Split(',');


      ListViewItem Listdata = new ListViewItem();
      Listdata.Text = csvdata[0];
      Listdata.SubItems.Add(csvdata[1]);
      Listdata.SubItems.Add(csvdata[2]);
      listView1.Items.Add(Listdata);
  }

  srInf.Close();

Posted 27-Dec-11 5:20am

MillionX30

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When answering a question please:

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Espen Harlinn · Accepted Answer · 2011-12-27T05:57:00

Solution 1

Have a look at ObjectListView[^]
Here is an article A Much Easier to Use ListView[^].

If you really want to use the standard listview, have a look at custom painting[^].

Best regards
Espen Harlinn

Posted 27-Dec-11 5:57am

Espen Harlinn

Comments

Sergey Alexandrovich Kryukov 27-Dec-11 12:07pm

It could be useful, my 5, but the root of the problem is general approach.
--SA

Espen Harlinn 27-Dec-11 12:09pm

Thank you, Sergey!

MillionX30 27-Dec-11 12:36pm

Thank you for your comment! Those links must be helpful to me.

Wendelius 28-Dec-11 17:09pm

Very good links!

Espen Harlinn 28-Dec-11 17:29pm

Thanks Mika!

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-12-27T06:02:00

You English is fine; I wish other members could post their question in such a clear language free from ugly spelling mistakes. However, your problem looks artificial. You put some unmatched data in controls in first place and later wants to match items. Why?

You should do the following: you need to separate your data layer from UI. When you want to find anything in data, an actual data element of some relationship, find it in data, not in the UI control.

As to your problems, you can do one of the following: 1) do not store images and file names separate, work with a list of structures containing both; 2) create a dictionary, such as System.Collection.Generic.Dictionary<string, Image> indexed by the file names (say, lo-case them before using as a key); that will give you a fast O(1) search of data by the file name (if you don't know "Big O" notation, read http://en.wikipedia.org/wiki/Big_O_notation[^]).

After you got a proper data model, think about data binding to your UI. In a simplest but most flexible case, it could be as simple as two method: population of UI from data and update data from UI, but chances are, you might need more complex UI behavior, but nevertheless, do it using the data model, not just UI or data in UI. On these grounds, also critically re-think you UI design. I don't know your detail, but if you change your approach, do some development but face with problems, ask your further questions. Most likely I would be able to help, other experts will probably help, too.

—SA