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//------------------------------------------------------------------------------
// <copyright file="DataKey.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
/// <devdoc>
/// </devdoc>
public class DataKey : IStateManager, IEquatable<DataKey> {
private IOrderedDictionary _keyTable;
private bool _isTracking;
private string[] _keyNames;
public DataKey(IOrderedDictionary keyTable) {
_keyTable = keyTable;
}
public DataKey(IOrderedDictionary keyTable, string[] keyNames)
: this(keyTable) {
_keyNames = keyNames;
}
/// <devdoc>
/// Inheritable overridable implementation of IsTrackingViewState
/// </devdoc>
protected virtual bool IsTrackingViewState {
get {
return _isTracking;
}
}
public virtual object this[int index] {
get {
if (_keyTable != null) {
return _keyTable[index];
}
return null;
}
}
public virtual object this[string name] {
get {
if (_keyTable != null) {
return _keyTable[name];
}
return null;
}
}
public virtual object Value {
get {
if ((_keyTable != null) && (_keyTable.Count > 0)) {
return _keyTable[0];
}
return null;
}
}
public virtual IOrderedDictionary Values {
get {
if (_keyTable == null) {
return null;
}
if (_keyTable is OrderedDictionary) {
return ((OrderedDictionary)_keyTable).AsReadOnly();
}
// don't return the actual table because we don't want the user to mess with it.
if (_keyTable is ICloneable) {
return (IOrderedDictionary)((ICloneable)_keyTable).Clone();
}
OrderedDictionary table = new OrderedDictionary();
foreach (DictionaryEntry entry in _keyTable) {
table.Add(entry.Key, entry.Value);
}
return table.AsReadOnly();
}
}
/// <devdoc>
/// Inheritable overridable implementation of LoadViewState
/// </devdoc>
protected virtual void LoadViewState(object state) {
if (state != null) {
if (_keyNames != null) {
object[] myState = (object[])state;
// if we have key names, then we only stored values.
if (myState[0] != null) {
for (int i = 0; i < myState.Length && i < _keyNames.Length; i++) {
_keyTable.Add(_keyNames[i], myState[i]);
}
}
}
else {
if (state != null) {
ArrayList stateArrayList = state as ArrayList;
if (stateArrayList == null) {
throw new HttpException(SR.GetString(SR.ViewState_InvalidViewState));
}
OrderedDictionaryStateHelper.LoadViewState(_keyTable, stateArrayList);
}
}
}
}
/// <devdoc>
/// Inheritable overridable implementation of SaveViewState
/// </devdoc>
protected virtual object SaveViewState() {
int count = _keyTable.Count;
if (count > 0) {
object myState;
if (_keyNames != null) {
// if we have key names, then we only have to store values.
myState = new object[count];
for (int i = 0; i < count; i++) {
((object[])myState)[i] = _keyTable[i];
}
}
else {
myState = OrderedDictionaryStateHelper.SaveViewState(_keyTable);
}
return myState;
}
return null;
}
/// <devdoc>
/// Inheritable overridable implementation of TrackViewState
/// </devdoc>
protected virtual void TrackViewState() {
_isTracking = true;
}
#region IStateManager implementation
/// <internalonly/>
bool IStateManager.IsTrackingViewState {
get {
return IsTrackingViewState;
}
}
/// <internalonly/>
void IStateManager.LoadViewState(object state) {
LoadViewState(state);
}
/// <internalonly/>
object IStateManager.SaveViewState() {
return SaveViewState();
}
/// <internalonly/>
void IStateManager.TrackViewState() {
TrackViewState();
}
#endregion
#region IEquatable<DataKey> Members
[SuppressMessage("Microsoft.Security", "CA2123:OverrideLinkDemandsShouldBeIdenticalToBase")]
public bool Equals(DataKey other) {
if (other == null) {
return false;
}
string[] aKeys = _keyNames;
string[] bKeys = other._keyNames;
if (aKeys == null && _keyTable != null) {
aKeys = new string[_keyTable.Count];
_keyTable.Keys.CopyTo(aKeys, 0);
}
if (bKeys == null && _keyTable != null) {
bKeys = new string[other._keyTable.Count];
other._keyTable.Keys.CopyTo(bKeys, 0);
}
// Compare the keys array
bool hasSameKeyNames = DataBoundControlHelper.CompareStringArrays(aKeys, bKeys);
if (hasSameKeyNames) {
if (aKeys != null && bKeys != null) {
foreach (string key in aKeys) {
if (!Object.Equals(this[key], other[key])) {
return false;
}
}
}
return true;
}
return false;
}
#endregion
}
}
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