Develop Reference

Filter items in a ListView in real time

My program generates ListView full of information. I type into a text box a name that might match one of the item names in the ListView. I want this typed name to weed out the names from the ListView that don't match.
For example, if I type in "abc", names like "uvw" and "xyz" wouldn't show up anymore, but "abc" and "abcde" would still show up in the list view.
The end goal is to be able to check the checkboxes next to the names I want, and search for more names, eventually selecting several, without resetting the checkboxes.
Right now I click a button and the ListView is populated:
private void button1_Click(object sender, EventArgs e)
{
List<string> myList = getList();
foreach(string s in myList)
{
listView1.Items.Add(s);
}
}
getList() just returns a List<string> of all the names I want.
I can't figure out how to make the ListView update in real time when I type in my text box. I'm able to update it with a button click via repopulating the ListView based on looping through the List, and checking each name, but that's not what I want. It also doesn't retain checked check boxes, as it's a newly generated list each time.
I read about a "text change listener", but I'm not sure that's what I should be using here...

With filtering you need some way of remembering which ListViewItems are selected, so instead of inserting all your ListViewItems into your listview you want to instantiate them in a master list. Then attach a TextChanged event handler to your text box and when the text changes you display the items.
List<ListViewItem> masterlist;
public Form1()
{
InitializeComponent();
masterlist = new List<ListViewItem>();
}
private void button1_Click(object sender, EventArgs e)
{
// Populate the masterlist
masterlist.Clear();
foreach(string s in getList())
{
masterlist.Items.Add(new ListViewItem(s));
}
// Display the items in the listview
DisplayItems();
}
private void DisplayItems()
{
listView1.Items.Clear();
// This filters and adds your filtered items to listView1
foreach(ListViewItem item in masterlist.Where(lvi => lvi.Text.ToLower().Contains(textBox1.Text.ToLower().Trim())))
{
listView1.Items.Add(item);
}
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
// Re-display the items when the filter changes
DisplayItems();
}
As you're dealing directly with ListViewItems in your masterlist they will retain their checked state when swapped in and out of listView1.
I have assumed that your filter textbox is called textBox1.

If you want to go for a full C# solution (rather than using any Javascript), as much as it pains me, I would suggest using an UpdatePanel.
Put your ListBox inside they the <ContentTemplate> section of the <UpdatePanel> then add an <asp:AsyncPostBackTrigger> with the ControlID set to that of your textbox. Make sure that the UpdateMode property of the UpdatePanel is set to "Conditional".
On your TextBox you will also have to set the AutoPostBack property to true. On the TextBox itself you will have to create a TextChanged event handler, then in your code behind (.cs file) you will have the logic for your TextChanged handler which will filter the list then set the new value for your ListBox.
UpdatePanels are ok for simply scenarios, but you can very easily get yourself into trouble by mis-using them.

Name of item in ListView

I am trying to get name of clicked item in ListView. I do not declaring in code names of items in ListView. User is declaring that names in running app. What i need to do is, when i click on item in ListView, in TextBlock will be name of item, whitch i clicked.
This is my simple code yet:
private void lstViewOfUsers_ItemClick(object sender, ItemClickEventArgs e)
{
TextBlock.Text = Name of clicked item
}

To get the text of an item in the first column then you would do :
TextBlock.Text = lstViewOfUsers.SelectedItems[0].Text;
If you wanted to get the text of a subitem it would look like this :
TextBlock.Text = lstViewOfUsers.SelectedItems[0].SubItems[1].Text;

You can get the index of the clicked item by using the ItemClickEventArgs parameter
another option is to do something like this:
MyItemModel item = (MyItemModel)e.ClickedItem;

ListView Item select in winform

I want to select item in a ListView upon clicking. I also want to know what I clicked.
I work on winforms with c#.I also want to know How I can clicking the all row?

Just handle the Click event on the list and use the ListView.SelectedItems property to get what items are selected:
private void listView1_Click(object sender, EventArgs e)
{
var firstSelectedItem = listView1.SelectedItems[0];
}

u can use MouseEventArgs and get the mouse location check if it exists inside the selected item bound , that means the click was made on the selected item .
EDIT :
example :
private void myList_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (myList.SelectedItems.Count >= 1)
{
ListViewItem item = myList.SelectedItems[0];
//here i check for the Mouse pointer location on click if its contained
// in the actual selected item's bounds or not .
// cuz i ran into a problem with the ui once because of that ..
if (item.Bounds.Contains(e.Location))
{
MessageBox.Show("Double Clicked on :"+item.Text);
}
}
}

also if you use xaml for window then you must add MouseUp="listView1_Click" attribute to ListView tag

Listbox with Custom Listitem -- Prevent Selection?

I have a listbox that uses a UserControl as the item template. Inside the UserControl, I have an image (an X) that when clicked, sends out event to remove the UserControl(listitem) from the listbox.
Is there a way to prevent the listbox from selecting that item when a user clicks on the image but still allows listitem selection for everything else in the control?

Make sure you mark the event as handled when the user clicks the Image:
private void ImageClicked(object sender, RoutedEventArgs e)
{
//send out event to remove UserControl
//ensure the event doesn't bubble up further to the ListBoxItem
e.Handled = true;
}

Change a selected item in a listview based on the selection in another listview

I have two list views. In the Item command event of the first Listview i am showing the second list view in modal popup using ajaxtoolkit.
protected void lvSelection_ItemCommand(object sender, ListViewCommandEventArgs e)
{
this.lvPopup.Visible = true;
this.lvPopup.DataSource = linqdataSource;
this.lvPopup.DataBind();
this.mdlPopup.Show();
}
Now in the itemcommand event of the second list view I need to change the content of the selected item in the first listview.
Is it possible to do that?

protected void lvPopup_ItemCommand(object sender, ListViewCommandEventArgs e)
{
// Set the text of the first list view item to the selected item
// of the second list view.
lstView1.Items[lstView1.SelectedIndex].Text =
lstView2.Items[lstView2.SelectedIndex].Text
}

I'd think that if you were to set the CommandName of the selector button in the first ListView to "Select" - from the second list view's ItemCommand event, you should be able to alter either the SelectedItemTemplate or the current item for the selected item in the first list.
protected void lvPopup_ItemCommand(object sender, ListViewCommandEventArgs e)
{
lvSelection.SelectedItemTemplate = "<div>woohoo!</div>";
// OR...
lvSelection.Items[lvSelection.SelectedIndex].SkinID = "SomeNewSkinForExample";
mdlPopup.Hide();
}

Have you already tried to dynamically generate the items of the List?
On the event code of the 1st list, clear the Items from the 2nd list and populate it with whatever logic suits you.