iframe是什么意思？winform用户控件自定义属性问题

IFRAME 元素也就是文档中的文档，或者像浮动的框架(FRAME)。frames 集合提供了对 IFRAME 内容的访问。frame有骨架的意思 而在其前面加个i构成了iframe元素也就是文档中的文档。使用iframe可以在网页中再嵌入一个网页

把代码贴全点，不是很清楚你要做什么； 看懂了...我语文退化阿...public class ToolBarItemConverter: ExpandableObjectConverter{ public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { return false; } public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { return false; }}[Category(“集合“),Description(“菜单项集合“),TypeConverter(typeof(ToolBarItemConverter))] public ToolBarItem C_Items { get; set; } 或者 ------------------------------------------------ class ToolBarItemEditor: UITypeEditor { public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context) { return UITypeEditorEditStyle.Modal; } public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { ToolBarItem item = (value as ToolBarItem); if (item == null) return value; FormToolBarItem form = new FormToolBarItem(item); //假定一个用来表示toolbaritem if(form.ShowDialog() == DialogResult.OK) return form.Item; return item; } }[Category(“集合“),Description(“菜单项集合“), [Editor(typeof(ToolBarItemEditor), typeof(UITypeEditor))] public ToolBarItem C_Items { get; set; } ^.^ 童鞋给钱...

不时, 偶尔, 间或,有时 1. From time to time he fired questions at me. 他不时向我提出许多问题。2. Ships are laid up, from time to time, for repairs. 船只常常因不能使用而需要修理。3. I can see Hieks at the library from time to time. 我在图书馆有时能看见希克斯。4. Good ideas swim into my mind from time to time. 我的脑海里不时地会浮现出一些好主意。5. From time to time,she gave him an encouraging nod. 她不时对他点头鼓励。