/// <summary>
/// 从缓存中取Func，缓存没有则创建后放到缓存
/// </summary>
static private Func <object, object> GetFunc(System.Web.UI.TemplateControl control, string propertyExpression)
{
Type dataItemType = control.Page.GetDataItem().GetType();
if (!_dicCache.ContainsKey(dataItemType))
{
lock (_dicCache)
{
if (!_dicCache.ContainsKey(dataItemType))
{
_dicCache.Add(dataItemType, new Dictionary <string, Func <object, object> >());
}
}
}
Dictionary <string, Func <object, object> > dic2 = _dicCache[dataItemType];
if (!dic2.ContainsKey(propertyExpression))
{
lock (_dicCache)
{
if (!dic2.ContainsKey(propertyExpression))
{
dic2.Add(propertyExpression, CreateFunc(dataItemType, propertyExpression));
}
}
}
return(dic2[propertyExpression]);
}
public ExpressionBuilderContext(System.Web.UI.TemplateControl templateControl)
{
}
public static object FastEval(this System.Web.UI.TemplateControl control, string propertyExpression)
{
Func <object, object> func = GetFunc(control, propertyExpression);
return(func(control));
}