它是如此普遍使用的類名稱的標記,但如果你願意,你可以指定另一個名字,我不解釋更多,如果你想請評論
時asp.net編譯標記,它使用默認參數較少的構造函數
你可以使用任何集合類型,但如果你想使用viewstate的好處你的集合類型必須實現IStateManager接口(下面我寫了我爲自己創建的集合的源國家管理支持)
是的,你的控制可以有多個集合,只需添加所需要的屬性如下:
(我用我的代碼中的一個,請您想要的名稱替換名稱),如果你想擁有 首先收集你必須在你的控制中定義它的屬性。 想象我們有一個控制命名CustomControl,由於下方延伸控制:
[System.Web.UI.ParseChildrenAttribute(true)]
[System.Web.UI.PersistChildrenAttribute(false)]
public class CustomControl : Control{
private GraphCollection m_graphs;
[Bindable(false)]
[Category("Appearance")]
[DefaultValue("")]
[Localizable(true)]
[PersistenceMode(PersistenceMode.InnerProperty)]
public GraphCollection Graphs
{
get
{
if (this.m_graphs == null) {
this.m_graphs = new GraphCollection();
if (base.IsTrackingViewState) {
this.m_graphs.TrackViewState();
}
}
return this.m_graphs;
}
}
}
,你可以看到在上面的代碼中,CustomControl有名爲「m_graphs」字段類型的「GraphCollection」,還暴露出一個屬性本場 也請請注意它的屬性PersistenceMode,爲asp.net財產「圖」說,必須堅持爲InnerProperty
也請注意應用於CustomControl類 屬性ParseChildrenAttribute兩個屬性說來asp.net是嵌套標記,必須被視爲屬性和屬性PersistChildr enAttribute對asp說。網:嵌套標記是無法控制的孩子
在最後,我把兩個源代碼狀態管理組件 首先從StateManagedCollection一直延伸GraphCollection的(兩班是我寫的)
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web.UI;
namespace Farayan.Web.Core
{
public class StateManagedCollection<T> : IList, ICollection, IEnumerable, IEnumerable<T>, IStateManager
where T : class, IStateManager, new()
{
// Fields
private List<T> listItems = new List<T>();
private bool marked = false;
private bool saveAll = false;
// Methods
public void Add(T item)
{
this.listItems.Add(item);
if (this.marked) {
//item.Dirty = true;
}
}
public void AddRange(T[] items)
{
if (items == null) {
throw new ArgumentNullException("items");
}
foreach (T item in items) {
this.Add(item);
}
}
public void Clear()
{
this.listItems.Clear();
if (this.marked) {
this.saveAll = true;
}
}
public bool Contains(T item)
{
return this.listItems.Contains(item);
}
public void CopyTo(Array array, int index)
{
this.listItems.CopyTo(array.Cast<T>().ToArray(), index);
}
public IEnumerator GetEnumerator()
{
return this.listItems.GetEnumerator();
}
public int IndexOf(T item)
{
return this.listItems.IndexOf(item);
}
public void Insert(int index, T item)
{
this.listItems.Insert(index, item);
if (this.marked) {
this.saveAll = true;
}
}
public void LoadViewState(object state)
{
object[] states = state as object[];
if (state == null || states.Length == 0)
return;
for (int i = 0; i < states.Length; i++) {
object itemState = states[i];
if (i < Count) {
T day = (T)listItems[i];
((IStateManager)day).LoadViewState(itemState);
} else {
T day = new T();
((IStateManager)day).LoadViewState(itemState);
listItems.Add(day);
}
}
}
public void Remove(T item)
{
int index = this.IndexOf(item);
if (index >= 0)
this.RemoveAt(index);
}
public void RemoveAt(int index)
{
this.listItems.RemoveAt(index);
if (this.marked) {
this.saveAll = true;
}
}
public object SaveViewState()
{
List<object> state = new List<object>(Count);
foreach (T day in listItems)
state.Add(((IStateManager)day).SaveViewState());
return state.ToArray();
}
int IList.Add(object item)
{
T item2 = (T)item;
this.listItems.Add(item2);
return listItems.Count - 1;
}
bool IList.Contains(object item)
{
return this.Contains((T)item);
}
int IList.IndexOf(object item)
{
return this.IndexOf((T)item);
}
void IList.Insert(int index, object item)
{
this.Insert(index, (T)item);
}
void IList.Remove(object item)
{
this.Remove((T)item);
}
void IStateManager.LoadViewState(object state)
{
this.LoadViewState(state);
}
object IStateManager.SaveViewState()
{
return this.SaveViewState();
}
void IStateManager.TrackViewState()
{
this.TrackViewState();
}
public void TrackViewState()
{
this.marked = true;
for (int i = 0; i < this.Count; i++) {
((IStateManager)this[i]).TrackViewState();
}
}
// Properties
public int Capacity
{
get
{
return this.listItems.Capacity;
}
set
{
this.listItems.Capacity = value;
}
}
public int Count
{
get
{
return this.listItems.Count;
}
}
public bool IsReadOnly
{
get
{
return false;
}
}
public bool IsSynchronized
{
get
{
return false;
}
}
public T this[int index]
{
get
{
return (T)this.listItems[index];
}
}
public object SyncRoot
{
get
{
return this;
}
}
bool IList.IsFixedSize
{
get
{
return false;
}
}
object IList.this[int index]
{
get
{
return this.listItems[index];
}
set
{
this.listItems[index] = (T)value;
}
}
bool IStateManager.IsTrackingViewState
{
get
{
return this.marked;
}
}
#region IEnumerable<T> Members
IEnumerator<T> IEnumerable<T>.GetEnumerator()
{
return this.listItems.GetEnumerator();
}
#endregion
#region IEnumerable Members
IEnumerator IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
#endregion
}
}
和GraphCollection
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Farayan.Web.Core;
namespace Farayan.Web.AmCharts
{
public class GraphCollection : StateManagedCollection<Graph>
{
}
}
最後圖形在我們的例子:
using System;
using System.Linq;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Web.UI;
using System.ComponentModel;
using Farayan.Web.AmCharts;
using System.Collections.Generic;
using Farayan.Web.Controls;
using System.Runtime;
using Farayan.Web.Core;
namespace Farayan.Web.AmCharts
{
public class Graph : StateManager
{
#region Colorize Property
[Browsable(true)]
[Localizable(false)]
[PersistenceMode(PersistenceMode.Attribute)]
[DefaultValue(false)]
public virtual bool Colorize
{
get { return ViewState["Colorize"] == null ? false : (bool)ViewState["Colorize"]; }
set { ViewState["Colorize"] = value; }
}
#endregion
//==============================
public override void LoadViewState(object state)
{
base.LoadViewState(state);
}
public override object SaveViewState()
{
return base.SaveViewState();
}
}
}
您可能會注意到Graph extends StateManager類
using System;
using System.Collections;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Web.UI;
using Farayan.Web.AmCharts;
namespace Farayan.Web.AmCharts
{
public class StateManager : IStateManager
{
protected StateBag ViewState = new StateBag();
#region IStateManager Members
public virtual bool IsTrackingViewState
{
get { return true; }
}
public virtual void LoadViewState(object state)
{
if (state != null) {
ArrayList arrayList = (ArrayList)state;
for (int i = 0; i < arrayList.Count; i += 2) {
string value = ((IndexedString)arrayList[i]).Value;
object value2 = arrayList[i + 1];
ViewState.Add(value, value2);
}
}
}
public virtual object SaveViewState()
{
ArrayList arrayList = new ArrayList();
if (this.ViewState.Count != 0) {
IDictionaryEnumerator enumerator = this.ViewState.GetEnumerator();
while (enumerator.MoveNext()) {
StateItem stateItem = (StateItem)enumerator.Value;
//if (stateItem.IsDirty) {
if (arrayList == null) {
arrayList = new ArrayList();
}
arrayList.Add(new IndexedString((string)enumerator.Key));
arrayList.Add(stateItem.Value);
//}
}
}
return arrayList;
}
public virtual void TrackViewState()
{
}
#endregion
#region IStateManager Members
bool IStateManager.IsTrackingViewState
{
get { return this.IsTrackingViewState; }
}
void IStateManager.LoadViewState(object state)
{
this.LoadViewState(state);
}
object IStateManager.SaveViewState()
{
return this.SaveViewState();
}
void IStateManager.TrackViewState()
{
this.TrackViewState();
}
#endregion
}
}