Easy select all with C# in a big listview without looping through each element separately

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I can't figure out how to programmatically select all items in a huge listview. It seems like it should be relatively easy, like "ListView.SelectAll()" or "ListView.Items.SelectAll()", but that doesn't appear to be the case. I do not find the "select all" command. STRG+A does not work either and I can't call it therefore.
Any better ideas than a flickering slow loop through all the items which I tried?

Note: I seek an inbuild command for this, I might have overlooked the rite function.

What I have tried:

I tried to loop through each element with foreach loop and set the property for each element separatly. it wasn't working fully, the listView flickered horrible and it took ages for 50000 elements to be selected. I found some similar questions in the internet, but no answers provided. I seek a better answer than my solution, an inbuild command or something alike as pure C#. Does somebody know a command?
VB6 had a "SelectAll" property and it selected up to 100K elements in a second. What I have to do to get this functionality in my C# program?

Posted 29-Apr-16 8:49am

ByeByeByeByeBye

Updated 29-Apr-16 8:55am

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Kevin Marois · Answer 1 · 2016-04-29T08:55:00

Solution 1

First, I have to say, if you're loading 50000+ items into a ListView, you have serious design issues. You might want to consider some kind of paging.

Ok, so, try adding each item in your collection to the listView's SelectItem collection.. Something like

foreach(var item in myItems)
{
myListView.SelectedItems.Add(item);
}

Posted 29-Apr-16 8:55am

Kevin Marois

Updated 29-Apr-16 8:57am

v2

Comments

Patrice T 30-Apr-16 11:10am

"wasn't working" is not informative !

Kevin Marois 29-Apr-16 14:59pm

The problem is that you're loading WAY too many items. Try loading 100 at a time. Handle the Scrolled event to load the next 100.

Kevin Marois 29-Apr-16 15:00pm

Have you tried using a Grid instead of a ListView?

Kevin Marois 29-Apr-16 16:51pm

Don't know what STRG-A means.. The problem here is that you're loading way too many items. The list isn't designed for this. You need to rethink your design. As I said before, consider paging.

Kevin Marois 29-Apr-16 17:21pm

Try CTRL-A, which is the standard Windows shortcut for Select All, but it wouldnt surprise me if it either didn't work or it was really slow.

Kevin Marois 29-Apr-16 17:21pm

By the way, is this WinForms or WPF?