如何在動態創建的控件中使用部分緩存？

Question

我有一個用PartialCaching屬性聲明的控件，如下所示：

[PartialCaching(60 * 60 * 12)]
public class MyControl : Control {
    // control contents ...
}

但是我使用new關鍵字在代碼中創建它。 問題是，如果控件在高速緩存中，則下次不能再創建該控件，而是需要將控件添加到頁面層次結構中，否則將無法呈現任何內容。 我需要的偽代碼是這樣的：

if (myControlIsCached) {
    var ctl = ???; // something that represents the cached control
                   // e.g. could be: new LiteralControl( myControlCachedData )
    this.Controls.Add( ctl );
}
else {
    var ctl = new MyControl();
    // setup control ...
    this.Controls.Add( ctl );
}

正確的做法是什么？

謝謝大家

Answer 1

我相信您正在尋找做這樣的事情：

Control possiblyCachedControl = LoadControl("path to control");
MyControlType control = null;
if (possiblyCachedControl is MyControlType)
{
    //control wasn't cached
    control = possiblyCachedControl as MyControlType;
}
else if (possiblyCachedControl is PartialCachingControl && ((PartialCachingControl)possiblyCachedControl).CachedControl != null)
{
    //control was cached
    control = (MyControlType)((PartialCachingControl)possiblyCachedControl).CachedControl;
}
if (control != null)
{
    //use the control
}