Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / ndp / fx / src / DLinq / Dlinq / DataBindingList.cs / 1 / DataBindingList.cs
using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Data.Linq.Mapping; using System.Reflection; namespace System.Data.Linq.Provider { internal static class BindingList { internal static IBindingList Create(DataContext context, IEnumerable sequence) { List list = sequence.ToList(); MetaTable metaTable = context.Services.Model.GetTable(typeof(T)); if (metaTable != null) { ITable table = context.GetTable(metaTable.RowType.Type); Type bindingType = typeof(DataBindingList<>).MakeGenericType(metaTable.RowType.Type); return (IBindingList)Activator.CreateInstance(bindingType, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, new object[] { list, table }, null ); } else { return new SortableBindingList (list); } } } internal class DataBindingList : SortableBindingList where TEntity : class { private Table data; private TEntity addNewInstance; private TEntity cancelNewInstance; private bool addingNewInstance; internal DataBindingList(IList sequence, Table data) : base(sequence != null ? sequence : new List ()) { if (sequence == null) { throw Error.ArgumentNull("sequence"); } if (data == null) { throw Error.ArgumentNull("data"); } this.data = data; } protected override object AddNewCore() { 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.InsertOnSubmit(item); } } protected override void RemoveItem(int index) { if (index >= 0 && index < Count && this[index] == cancelNewInstance) { cancelNewInstance = null; } else { this.data.DeleteOnSubmit(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.DeleteOnSubmit(removedItem); } this.data.InsertOnSubmit(item); } } protected override void ClearItems() { this.data.DeleteAllOnSubmit(this.data.ToList()); base.ClearItems(); } public override void EndNew(int itemIndex) { if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) { this.data.InsertOnSubmit(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); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Data.Linq.Mapping; using System.Reflection; namespace System.Data.Linq.Provider { internal static class BindingList { internal static IBindingList Create (DataContext context, IEnumerable sequence) { List list = sequence.ToList(); MetaTable metaTable = context.Services.Model.GetTable(typeof(T)); if (metaTable != null) { ITable table = context.GetTable(metaTable.RowType.Type); Type bindingType = typeof(DataBindingList<>).MakeGenericType(metaTable.RowType.Type); return (IBindingList)Activator.CreateInstance(bindingType, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, new object[] { list, table }, null ); } else { return new SortableBindingList (list); } } } internal class DataBindingList : SortableBindingList where TEntity : class { private Table data; private TEntity addNewInstance; private TEntity cancelNewInstance; private bool addingNewInstance; internal DataBindingList(IList sequence, Table data) : base(sequence != null ? sequence : new List ()) { if (sequence == null) { throw Error.ArgumentNull("sequence"); } if (data == null) { throw Error.ArgumentNull("data"); } this.data = data; } protected override object AddNewCore() { 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.InsertOnSubmit(item); } } protected override void RemoveItem(int index) { if (index >= 0 && index < Count && this[index] == cancelNewInstance) { cancelNewInstance = null; } else { this.data.DeleteOnSubmit(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.DeleteOnSubmit(removedItem); } this.data.InsertOnSubmit(item); } } protected override void ClearItems() { this.data.DeleteAllOnSubmit(this.data.ToList()); base.ClearItems(); } public override void EndNew(int itemIndex) { if (itemIndex >= 0 && itemIndex < Count && this[itemIndex] == addNewInstance) { this.data.InsertOnSubmit(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); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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