Add item in listview is too slow in WPF

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My problem is that I need to add a lot of items to a Listview in WPF. In WinForms you'd just use the BeginUpdate() method, add everything, and finally use the EndUpdate() method.

So, how would I stop the drawing in a WPF Listview until every item is added and then draw everything in one go?

What I have tried:

C#

foreach (FilePaths filePath in directoryPath.GetFilePaths())
 {
   GetFileListViewItem(filePath);
 }
In this GetFileListViewItem method, i add the item to listview.

private void GetFileListViewItem(FilePaths filePath)
{
        string ext = GetExtension(filePath.GetPath());
        string fileName = GetFileNameWithoutExtension(filePath.GetPath());
        string type = "";
        if (ext != "")
        { 
            type =  ext.ToUpper().Substring(1) + " File";
        }
        else
        {
            type = "Unknown";
        }

        fileListView.Items.Add(new FileListItem
        {
            Name = fileName,
            Type = type
        });
 }

Posted 5-May-16 22:26pm

Ranjith Kumar

Updated 6-May-16 1:26am

CHill60

v3

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CHill60 6-May-16 4:49am

Put the items into a datatable or list and bind the control to that

Hrishikesh Ranjit Shivacharan 6-May-16 6:02am

Datatable is very easy way to bind the data to Itemssource.

VR Karthikeyan 6-May-16 7:06am

Just declare a list of type FileListItem, or an observablecollection of type FileListItem and add every item in this collection or list in your foreach loop. after finishing, just bind it to ItemsSource of ListView.

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VR Karthikeyan · Answer 1 · 2016-05-06T01:26:00

Hi, just change your ListView code in xaml like below,

XML

<ListView x:Name="listView" Height="249" Width="497">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="File Name" DisplayMemberBinding="{Binding Name}" />
            <GridViewColumn Header="Type" DisplayMemberBinding="{Binding Type}" />
        </GridView>
    </ListView.View>
</ListView>

And change your code like this,

C#

ObservableCollection<FileListItem> FileListItemsCollection = new ObservableCollection<FileListItem>();

foreach (FilePaths filePath in directoryPath.GetFilePaths())
{
    GetFileListViewItem(filePath);
}
fileListView.ItemsSource = FileListItemsCollection;

And,

C#

private void GetFileListViewItem(FilePaths filePath)
{
    string ext = GetExtension(filePath.GetPath());
    string fileName = GetFileNameWithoutExtension(filePath.GetPath());
    string type = "";
    if (ext != "")
    {
        type = ext.ToUpper().Substring(1) + " File";
    }
    else
    {
        type = "Unknown";
    }

    FileListItemsCollection.Add(new FileListItem
    {
        Name = fileName,
        Type = type
    });
}

declare FileListItemsCollection globally.