109 lines
3.7 KiB
C#
109 lines
3.7 KiB
C#
using System.Collections.Generic;
|
|
using System.ComponentModel;
|
|
using System.Linq;
|
|
using System.Reflection;
|
|
using System.Diagnostics.CodeAnalysis;
|
|
|
|
namespace System.Data.Linq {
|
|
internal class EntitySetBindingList<TEntity> : SortableBindingList<TEntity>
|
|
where TEntity : class {
|
|
private EntitySet<TEntity> data;
|
|
private TEntity addNewInstance;
|
|
private TEntity cancelNewInstance;
|
|
private bool addingNewInstance;
|
|
|
|
internal EntitySetBindingList(IList<TEntity> sequence, EntitySet<TEntity> data)
|
|
: base(sequence) {
|
|
if (sequence == null) {
|
|
throw Error.ArgumentNull("sequence");
|
|
}
|
|
if (data == null) {
|
|
throw Error.ArgumentNull("data");
|
|
}
|
|
|
|
this.data = data;
|
|
}
|
|
|
|
[SuppressMessage("Microsoft.Performance", "CA1822:MarkMembersAsStatic", Justification="Unknown reason.")]
|
|
private void ThrowEntitySetErrorsIfTypeInappropriate() {
|
|
Type type = typeof(TEntity);
|
|
|
|
if (type.IsAbstract) {
|
|
throw Error.EntitySetDataBindingWithAbstractBaseClass(type.Name);
|
|
}
|
|
if (type.GetConstructor(System.Type.EmptyTypes) == null) {
|
|
throw Error.EntitySetDataBindingWithNonPublicDefaultConstructor(type.Name);
|
|
}
|
|
}
|
|
|
|
protected override object AddNewCore() {
|
|
ThrowEntitySetErrorsIfTypeInappropriate();
|
|
addingNewInstance = true;
|
|
addNewInstance = (TEntity)base.AddNewCore();
|
|
return addNewInstance;
|
|
}
|
|
|
|
protected override void InsertItem(int index, TEntity item) {
|
|
base.InsertItem(index, item);
|
|
if (!addingNewInstance && index >= 0 && index <= Count) {
|
|
this.data.Insert(index, item);
|
|
}
|
|
}
|
|
|
|
protected override void RemoveItem(int index) {
|
|
if (index >= 0 && index < Count && this[index] == cancelNewInstance) {
|
|
cancelNewInstance = null;
|
|
}
|
|
else {
|
|
this.data.Remove(this[index]);
|
|
}
|
|
|
|
base.RemoveItem(index);
|
|
}
|
|
|
|
protected override void SetItem(int index, TEntity item) {
|
|
TEntity removedItem = this[index];
|
|
base.SetItem(index, item);
|
|
if (index >= 0 && index < Count) {
|
|
//Check to see if the user is trying to set an item that is currently being added via AddNew
|
|
//If so then the list should not continue the AddNew; but instead add the item
|
|
//that is being passed in.
|
|
if (removedItem == addNewInstance) {
|
|
addNewInstance = null;
|
|
addingNewInstance = false;
|
|
}
|
|
else {
|
|
this.data.Remove(removedItem);
|
|
}
|
|
this.data.Insert(index,item);
|
|
}
|
|
|
|
}
|
|
|
|
protected override void ClearItems() {
|
|
this.data.Clear();
|
|
base.ClearItems();
|
|
}
|
|
|
|
public override void EndNew(int itemIndex) {
|
|
if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) {
|
|
this.data.Add(addNewInstance);
|
|
addNewInstance = null;
|
|
addingNewInstance = false;
|
|
}
|
|
|
|
base.EndNew(itemIndex);
|
|
}
|
|
|
|
public override void CancelNew(int itemIndex) {
|
|
if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) {
|
|
cancelNewInstance = addNewInstance;
|
|
addNewInstance = null;
|
|
addingNewInstance = false;
|
|
}
|
|
|
|
base.CancelNew(itemIndex);
|
|
}
|
|
}
|
|
}
|