Extension to BindingList that allows for cancelable notifications of changing and deleting
$begingroup$
This is an extension of the System.ComponentModel.BindingList<T> class that allows for notifications of item changing and deleting. These notifications provided the outgoing item and the incoming item, as well as a Cancel property to cancel the change or deletion.
In additon, it also allows for a bulk addition of items, which is just a loop of AddItem (which will trigger a change notification for each item added).
On top of bulk addition, there is a SetItems which will clear the collection and add all the items provided, but will only fire one Reset notification.
using System;
using System.Collections.Generic;
using System.ComponentModel;
namespace BindingListExtension
{
public class BindingListEx<T> : BindingList<T>
{
public event EventHandler<ListItemRemovingEventArgs<T>> ListItemRemoving;
public event EventHandler<ListItemChangingEventArgs<T>> ListItemChanging;
protected override void RemoveItem(int index)
{
var args = new ListItemRemovingEventArgs<T>(this[index], index);
ListItemRemoving?.Invoke(this, args);
if (args.Cancel) return;
base.RemoveItem(index);
}
protected override void SetItem(int index, T item)
{
var args = new ListItemChangingEventArgs<T>(this[index], item, index);
ListItemChanging?.Invoke(this, args);
if (args.Cancel) return;
base.SetItem(index, item);
}
public void SetItems(IEnumerable<T> items)
{
RaiseListChangedEvents = false;
Clear();
AddItems(items);
RaiseListChangedEvents = true;
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
public void AddItems(IEnumerable<T> items)
{
if (items != null)
{
foreach (T item in items)
{
Add(item);
}
}
}
}
public class ListItemRemovingEventArgs<T> : CancelEventArgs
{
public ListItemRemovingEventArgs(T oldItem, int index)
{
OldItem = oldItem;
}
public T OldItem { get; }
public int Index { get; }
}
public class ListItemChangingEventArgs<T> : ListItemRemovingEventArgs<T>
{
public ListItemChangingEventArgs(T oldItem, T newItem, int index) : base(oldItem, index)
{
NewItem = newItem;
}
public T NewItem { get; }
}
}
c# collections databinding
asked 4 mins ago
helluvamatthelluvamatt
111
$endgroup$
add a comment |
$begingroup$
This is an extension of the System.ComponentModel.BindingList<T> class that allows for notifications of item changing and deleting. These notifications provided the outgoing item and the incoming item, as well as a Cancel property to cancel the change or deletion.
In additon, it also allows for a bulk addition of items, which is just a loop of AddItem (which will trigger a change notification for each item added).
On top of bulk addition, there is a SetItems which will clear the collection and add all the items provided, but will only fire one Reset notification.
using System;
using System.Collections.Generic;
using System.ComponentModel;
namespace BindingListExtension
{
public class BindingListEx<T> : BindingList<T>
{
public event EventHandler<ListItemRemovingEventArgs<T>> ListItemRemoving;
public event EventHandler<ListItemChangingEventArgs<T>> ListItemChanging;
protected override void RemoveItem(int index)
{
var args = new ListItemRemovingEventArgs<T>(this[index], index);
ListItemRemoving?.Invoke(this, args);
if (args.Cancel) return;
base.RemoveItem(index);
}
protected override void SetItem(int index, T item)
{
var args = new ListItemChangingEventArgs<T>(this[index], item, index);
ListItemChanging?.Invoke(this, args);
if (args.Cancel) return;
base.SetItem(index, item);
}
public void SetItems(IEnumerable<T> items)
{
RaiseListChangedEvents = false;
Clear();
AddItems(items);
RaiseListChangedEvents = true;
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
public void AddItems(IEnumerable<T> items)
{
if (items != null)
{
foreach (T item in items)
{
Add(item);
}
}
}
}
public class ListItemRemovingEventArgs<T> : CancelEventArgs
{
public ListItemRemovingEventArgs(T oldItem, int index)
{
OldItem = oldItem;
}
public T OldItem { get; }
public int Index { get; }
}
public class ListItemChangingEventArgs<T> : ListItemRemovingEventArgs<T>
{
public ListItemChangingEventArgs(T oldItem, T newItem, int index) : base(oldItem, index)
{
NewItem = newItem;
}
public T NewItem { get; }
}
}
c# collections databinding
asked 4 mins ago
helluvamatthelluvamatt
111
$endgroup$
add a comment |
$begingroup$
This is an extension of the System.ComponentModel.BindingList<T> class that allows for notifications of item changing and deleting. These notifications provided the outgoing item and the incoming item, as well as a Cancel property to cancel the change or deletion.
In additon, it also allows for a bulk addition of items, which is just a loop of AddItem (which will trigger a change notification for each item added).
On top of bulk addition, there is a SetItems which will clear the collection and add all the items provided, but will only fire one Reset notification.
using System;
using System.Collections.Generic;
using System.ComponentModel;
namespace BindingListExtension
{
public class BindingListEx<T> : BindingList<T>
{
public event EventHandler<ListItemRemovingEventArgs<T>> ListItemRemoving;
public event EventHandler<ListItemChangingEventArgs<T>> ListItemChanging;
protected override void RemoveItem(int index)
{
var args = new ListItemRemovingEventArgs<T>(this[index], index);
ListItemRemoving?.Invoke(this, args);
if (args.Cancel) return;
base.RemoveItem(index);
}
protected override void SetItem(int index, T item)
{
var args = new ListItemChangingEventArgs<T>(this[index], item, index);
ListItemChanging?.Invoke(this, args);
if (args.Cancel) return;
base.SetItem(index, item);
}
public void SetItems(IEnumerable<T> items)
{
RaiseListChangedEvents = false;
Clear();
AddItems(items);
RaiseListChangedEvents = true;
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
public void AddItems(IEnumerable<T> items)
{
if (items != null)
{
foreach (T item in items)
{
Add(item);
}
}
}
}
public class ListItemRemovingEventArgs<T> : CancelEventArgs
{
public ListItemRemovingEventArgs(T oldItem, int index)
{
OldItem = oldItem;
}
public T OldItem { get; }
public int Index { get; }
}
public class ListItemChangingEventArgs<T> : ListItemRemovingEventArgs<T>
{
public ListItemChangingEventArgs(T oldItem, T newItem, int index) : base(oldItem, index)
{
NewItem = newItem;
}
public T NewItem { get; }
}
}
c# collections databinding
asked 4 mins ago
helluvamatthelluvamatt
111
$endgroup$
This is an extension of the System.ComponentModel.BindingList<T> class that allows for notifications of item changing and deleting. These notifications provided the outgoing item and the incoming item, as well as a Cancel property to cancel the change or deletion.
In additon, it also allows for a bulk addition of items, which is just a loop of AddItem (which will trigger a change notification for each item added).
On top of bulk addition, there is a SetItems which will clear the collection and add all the items provided, but will only fire one Reset notification.
using System;
using System.Collections.Generic;
using System.ComponentModel;
namespace BindingListExtension
{
public class BindingListEx<T> : BindingList<T>
{
public event EventHandler<ListItemRemovingEventArgs<T>> ListItemRemoving;
public event EventHandler<ListItemChangingEventArgs<T>> ListItemChanging;
protected override void RemoveItem(int index)
{
var args = new ListItemRemovingEventArgs<T>(this[index], index);
ListItemRemoving?.Invoke(this, args);
if (args.Cancel) return;
base.RemoveItem(index);
}
protected override void SetItem(int index, T item)
{
var args = new ListItemChangingEventArgs<T>(this[index], item, index);
ListItemChanging?.Invoke(this, args);
if (args.Cancel) return;
base.SetItem(index, item);
}
public void SetItems(IEnumerable<T> items)
{
RaiseListChangedEvents = false;
Clear();
AddItems(items);
RaiseListChangedEvents = true;
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
public void AddItems(IEnumerable<T> items)
{
if (items != null)
{
foreach (T item in items)
{
Add(item);
}
}
}
}
public class ListItemRemovingEventArgs<T> : CancelEventArgs
{
public ListItemRemovingEventArgs(T oldItem, int index)
{
OldItem = oldItem;
}
public T OldItem { get; }
public int Index { get; }
}
public class ListItemChangingEventArgs<T> : ListItemRemovingEventArgs<T>
{
public ListItemChangingEventArgs(T oldItem, T newItem, int index) : base(oldItem, index)
{
NewItem = newItem;
}
public T NewItem { get; }
}
}
c# collections databinding
c# collections databinding
asked 4 mins ago
helluvamatthelluvamatt
111
asked 4 mins ago
helluvamatthelluvamatt
111
asked 4 mins ago
helluvamatthelluvamatt
111
asked 4 mins ago
helluvamatthelluvamatt
111
asked 4 mins ago
helluvamatthelluvamatt
111
111
add a comment |
add a comment |
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