DataBindingList.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / 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. All rights reserved.

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