关于组件开发的一个问题???

[dragonqq]

我看到书上有这样一个例子
protected override void LoadViewState(object savedState)
{
if (savedState == null)
{
base.LoadViewState(null);
return;
}
if (savedState != null)
{
object[] myState = (object[])savedState;
if (myState.Length != 4)
{
throw new ArgumentException("Invalid view state");
}
base.LoadViewState(myState[0]);
if (myState[1] != null)
((IStateManager)ButtonStyle).LoadViewState(myState[1]);
if (myState[2] != null)
((IStateManager)LabelStyle).LoadViewState(myState[2]);
if (myState[3] != null)
((IStateManager)TextBoxStyle).LoadViewState(myState[3]);
}
}
我不明白myState[0],myState[1],myState[2],myState[3]对应什么值???

[exboy]

你看一下 SaveViewState 方法
LoadViewState(object savedState) savedState 的值是 SaveViewState 方法返回的值。

[nerk]

LoadViewState函数的传入参数：savedState，是一个数组，myState[0]...是各个元素

[dragonqq]

protected override object SaveViewState()
{
object[] myState = new object[4];
myState[0] = base.SaveViewState();
myState[1] = (_buttonStyle != null) ? ((IStateManager)_buttonStyle).SaveViewState() : null;
myState[2] = (_labelStyle != null) ? ((IStateManager)_labelStyle).SaveViewState() : null;
myState[3] = (_textBoxStyle != null) ? ((IStateManager)_textBoxStyle).SaveViewState() : null;

for (int i = 0; i < 4; i++)
{
if (myState[i] != null)
{
return myState;
}
}
return null;
}

这是它的SaveViewState() 方法,
myState[0] = base.SaveViewState(); 在这里调用基类的SaveViewState()是规则还是有其他含义!
for (int i = 0; i < 4; i++)
{
if (myState[i] != null)
{
return myState;
}
}
如果myState[0]!=null就返回myState数组,这是为什么?

[dragonqq]

谢谢大家先!