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Save and load content of listview to file.

Posted on 2010-11-21
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Last Modified: 2013-12-17
Hi,

I have the methode for saving the content of a listview to file.
But I don't have the methode for loading the file to listview.

Who can help me?

Peter

private void button3_Click(object sender, EventArgs e)

        {

            TextWriter tw = new StreamWriter("Data\\Glucose.sav");

            StringBuilder listViewContent = new StringBuilder();

            for (int item = 0; item < this.lstvGlucose.Items.Count; item++)

            {

                for (int subitem = 0;

                   subitem < this.lstvGlucose.Columns.Count;

                   subitem++)

                {

                    listViewContent.Append

                    (this.lstvGlucose.Items[item].SubItems[subitem].Text);

                    if (subitem < this.lstvGlucose.Columns.Count - 1)

                        listViewContent.Append(",");

                }

                tw.WriteLine(listViewContent);

                listViewContent = new StringBuilder();

            }

            tw.Close();

        }

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Question by:peterkiers
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7 Comments
 
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Expert Comment

by:abdkhlaif
ID: 34182859
are you converting the contents of the listview into aaa,bbb,ccc then saving the result to a file?
if so, here is an easy way to save then load the contents using String.Split method:
this code is for a single-column listview but it can work for multiple columns with few changes
// saving:

StringBuilder listViewContent = new StringBuilder();

foreach (ListViewItem item in listView1.Items)

	listViewContent.Append(item.Text + ",");



if(listViewContent.Length > 0) 

	listViewContent.Length = listViewContent.Length - 1; // remove the comma at the end



File.WriteAllText("Data\\Glucose.sav", listViewContent.ToString());



// loading:

string savedContents = File.ReadAllText("Data\\Glucose.sav");



ListView.ListViewItemCollection ls = new ListView.ListViewItemCollection(listView1); // gets the listview contents as a collection

ls.Clear();



foreach (string s in savedContents.Split(','))

	ls.Add(s);

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Author Comment

by:peterkiers
ID: 34182863
Hi, abdkhlaif.
I rather stick to my code. Because now I have the saving part working OK.
Only I am missing the loading part.

greetings, Peter Kiers
0
 
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Accepted Solution

by:
abdkhlaif earned 500 total points
ID: 34182937
you can still use the String.Split to convert a comma seperated values into a string array.
use this code for loading:

assuming that:
contents of file Data\\Glucose.sav:
a1,a2,a3,a4
b1,b2,b3,b4
c1,c2,c3,c4

and the listview has 4 columns
int rowcount = 0;

foreach (string line in File.ReadAllLines("Data\\Glucose.sav"))

{

	string[] items = line.Split(','); // convert line into a string array

	listView1.Items.Add(items[0]); // add row



	for (int i = 1; i < items.Length; i++) // skip the first item because its already added

		listView1.Items[rowcount].SubItems.Add(items[i]);

	rowcount++;

}

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Author Comment

by:peterkiers
ID: 34183102
My save methode uses a delimeter too.
P.
0
 
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Author Comment

by:peterkiers
ID: 34183103
I just want the loading part of it.

Greetings, Peter Kiers
0
 
LVL 3

Expert Comment

by:abdkhlaif
ID: 34183106
the code in my last comment is for loading only
0
 
LVL 1

Author Comment

by:peterkiers
ID: 34183172
Oke. Thanks.

Peter
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