不是所有的System.Web.UI.WebControl班，Text属性为什么要实施ITextControl？ [英] Why don't all System.Web.UI.WebControl classes with Text properties implement ITextControl?

问题描述

我很好奇，为什么只有某些 System.Web.UI.WebControl 控件实现某些接口时，他们有一个接​​口的相同的属性。

I'm curious why only some System.Web.UI.WebControl controls implement certain interfaces when they have the same properties of an interface.

例如，有很多具有Text属性，但仅控制下实施 ITextControl ：

For instance, there are plenty of controls that have a Text property but only the following implement ITextControl:

• 标签


• 文字


• DataBoundLiteral


• 文本框


• 列表控件

（文本框和列表控件实际执行的IEditableTextControl它实现ITextControl）

(TextBox and ListControl actually implement IEditableTextControl which implements ITextControl)

TableCell的，按钮，超链接和别人不一样，所以我必须写code这样的

TableCell, Button, HyperLink and others don't so I have to write code like this

ITextControl textControl = control as ITextControl;
TableCell tableCell = control as TableCell;

if (textControl != null)
{
    textControl.Text = value;
}
else if (tableCell != null)
{
    tableCell.Text = value;
}

而不是这种

control.Text = value;

这是一个设计决策或监督？

Was this a design decision or an oversight?

推荐答案

我觉得它的设计好了，我不认为这是一个监督;那些，其中文本的控制的目的的主要焦点的控制。我不明白你的意思，因为那将是非常方便的控制更多地利用这些类型的接口。

I think it was designed ok, I don't think it was an oversight; those are the controls where text is the primary focus of the purpose of the control. I do see your point because that would be very convenient to have controls utilize more of these types of interfaces.

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