使用 IHTMLDocuments 1、2、3 和 4

发布于 2024-07-20 06:21:48 字数 293 浏览 14 评论 0原文

我在当前项目中使用网络浏览器，目前我在设计模式下使用它以使其可编辑等。我当前使用的代码是：

WebBrowser.Document.DomDocument as IHTMLDocument2

IHTMLDocument2、3 或 4 实际上是什么？我还发现，在识别文档中的当前选择范围时，range.text.replace 方法的工作方式与 string.replace 不同。

有人可以向我解释 IHTMLDocuments 和 IHTMLTxtRange 的基本功能吗？

原文

I am using a web browser in my current project and currently I'm using it in design mode to make it editable etc. The code I am currently using is:

WebBrowser.Document.DomDocument as IHTMLDocument2

What actually is an IHTMLDocument2, 3 or 4? I have also found that when identifying a current selection range in the document, the range.text.replace method is not working the same way that a string.replace does.

Can anybody explain to me the basic functionality of the IHTMLDocuments and the IHTMLTxtRange please?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

单身狗的梦 2024-07-27 06:21:48

IHTMLDocument 是一个接口，本质上是一个“牢不可破”的契约，代表实现它的对象将提供的内容。

在迁移到新版本的代码时更改接口会破坏该契约，进而破坏依赖于该契约的代码。

假设您创建：

public interface IMyInterface {
      public int Property1 { get;  set; }
}

一年后您需要添加 Property2 但无法更改界面。因此，解决这个问题的一种方法是创建：

public interface IMyInterface2 {
    public int Property2 { get;set; }
}

然后使用正在实现 IMyInterface 的旧类：

public class MyObject : IMyInterface, IMyInterface2 {
    public int Property1 { get {} set {} }
    public int Property2 { get {} set {} }
}

然后您将不会破坏旧的合同，但可以在代码中使用新的接口，例如：

if (obj is IMyInterface) {
   Console.WriteLine(((IMyInterface)obj).Property1);

   if (obj is IMyInterface2) {
      //more
   }
}

这就是微软所做的。 IHTMLDocument 所在的mshtml 库是一个COM 库，而COM 严重依赖于接口。因此，随着库的发展，微软添加了越来越多的接口来公开更新的功能/代码。

IHTMLTxtRange 是更常用的 TextRange 对象。
它公开了一系列用于解析文本“片段”或“范围”的功能。

http://www.webreference.com/js/column12/trmethods.html

IHTMLDocument is an interface which is essentially an "unbreakable" contract that represents what the object that implements it will provide.

Changing the interface when moving to a new version of the code would break that contract and in turn break the code that is relying on that contract.

Suppose you create :

public interface IMyInterface {
      public int Property1 { get;  set; }
}

A year later you need to add Property2 but you cannot change your interface. So one way around that is to create:

public interface IMyInterface2 {
    public int Property2 { get;set; }
}

and then with your old Class that is implementing IMyInterface :

public class MyObject : IMyInterface, IMyInterface2 {
    public int Property1 { get {} set {} }
    public int Property2 { get {} set {} }
}

Then you will not break the older contract but can use the new interface in code such as:

if (obj is IMyInterface) {
   Console.WriteLine(((IMyInterface)obj).Property1);

   if (obj is IMyInterface2) {
      //more
   }
}

So that is what Microsoft did. The mshtml library that IHTMLDocument is in is a COM library and COM rely's heavily on interfaces. So as the library evolved Microsoft added more and more Interfaces to expose the newer functionality/code.

IHTMLTxtRange is an interface for the more commonly used TextRange object.
It exposes a bunch of functionality for parsing text "Fragments" or "Ranges".

http://www.webreference.com/js/column12/trmethods.html

回复收藏 0 原文

~没有更多了~