C#, MVVM ListBox ContextMenu

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I have MVVM application, my first MVVM app. So, I need to make a contextMenu in ListBox. I tried this:

In xaml code

C#

<ListBox HorizontalContentAlignment="Stretch" 
                 ItemTemplate="{DynamicResource UserListBoxItemTemplate}" 
                 ItemsSource="{Binding}" Margin="0,71,0,0" Name="lstAllUsers" 
                 SelectionMode="Extended" Grid.ColumnSpan="3"
                >               
                <ListBox.ContextMenu>
                    <ContextMenu>
                    <MenuItem Command="{Binding RemoveUserCommand}" Header="Remove user" />
                </ListBox.ContextMenu>
            </ListBox>

And in cs:


private DelegateCommand removeUser;
        public ICommand RemoveUserCommand
        {
            get
            {
                if (removeUser == null)
                {
                    removeUser = new DelegateCommand(RemoveUser);
                }
                return removeUser;
            }
        }
        private void RemoveUser()
        {
            int nSelected = this.UserControlList.lstAllUsers.SelectedIndex;
            ((User)this.UserControlList.lstAllUsers.SelectedItem).Status = 2;
            if (nSelected - 1 >= 0)
                this.UserControlList.lstAllUsers.SelectedIndex = nSelected - 1;
            else if (nSelected - 1 <= 0 && this.UserControlList.lstAllUsers.Items.Count != 0)
                this.UserControlList.lstAllUsers.SelectedIndex = nSelected;

            this.UserControlList.lstAllUsers.Items.Refresh();
        }

But it doesn't work.

Posted 30-Apr-12 23:15pm

asinefa

Updated 1-May-12 1:27am

v6

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Shahin Khorshidnia · Answer 1 · 2012-04-30T23:42:00

Hello
Use this:

HTML

<ListBox.ItemContainerStyle> 
        <Style TargetType="ListBoxItem"> 
            <Setter Property="ContextMenu"> 
                <Setter.Value> 
                    <ContextMenu> 
                       <MenuItem Comma...
                    </ContextMenu> 
                </Setter.Value> 
            </Setter> 
        </Style> 
    </ListBox.ItemContainerStyle>

Instead of this:

HTML

<ListBox.ContextMenu>
                    <ContextMenu>
                    <MenuItem Command="{Binding RemoveUserCommand}" Header="Remove user" />
                </ListBox.ContextMenu>

Thanks to This

Pete O'Hanlon · Answer 2 · 2012-04-30T23:45:00

What you are trying to do here is a weird mix of MVVM and code-behind. Rather than attempting to use the user control to change the status of the item, what you should be doing is changing the status of the item in the data.

Now, assuming you are using the PRISM implementation of DelegateCommand, your RemoveUser method should actually look like this (I'm assuming here that the User info is stored in a class called User in this example):

C#

private void RemoveUser(object listParameter)
{
  if (listParameter == null)
  {
    // The user didn't select a list item.
  }
  User user = listParameter as User;
  if (user != null)
  {
    user.Status = 2;
  }
}

And that's it. As long as you are bound to the data via the DataContext, you should be good to go.

brinda p · Answer 3 · 2012-05-01T02:53:00

hi...

Try this..

 public DelegateCommand<object> RemoveUserCommand{ get; set; }


RemoveUserCommand= new DelegateCommand(this.RemoveUser, this.RemoveUserExecute);

  private void RemoveUser()
        {
//do struff
}


public bool RemoveUserExecute()
        {
            return true;
        }

Hope this help Thnaks..

brinda p · Answer 4 · 2012-05-01T20:14:00

Solution 6

Hi,

Try this

https://github.com/mlaflamm/listbox-contextmenu

Hope this help Thanks..

Posted 1-May-12 20:14pm

brinda p

Updated 1-May-12 22:48pm

v3

asinefa · Answer 5 · 2012-05-01T02:01:00

Solution 3

Thx.
But, as for Solution 1, with my sc it doesn't work.

As for Solution 2, I didn't undestand about object listParameter and what to do with it.

Posted 1-May-12 2:01am

asinefa

asinefa · Answer 6 · 2012-05-01T03:36:00

Solution 5

Thank you, but I set breakpoint and it doesn't go to RemoveUserCommand. maybe something wrong with xaml. I used Solution 1 too.

Posted 1-May-12 3:36am

asinefa

Comments

Fardan 1-May-12 15:56pm

not here

C#, MVVM ListBox ContextMenu

6 solutions

Solution 1

Solution 2

Solution 4

Solution 6

Solution 3

Solution 5

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