用C#中的接口继承windows窗体
我有一个基本的 Windows 窗体类，其中包含两个按钮：“确定”和“取消”。这个基本表单实现了接口IBaseForm：
public interface IBaseForm
{
string FormText {get;set;}
DialogResult ShowView(IWin32Window owner);
}
public partial class BaseForm : IBaseForm
{
...
}
接下来我有一个窗口类，它继承自BaseForm并实现了另一个接口IItem：
public interface IItem : IBaseForm // here is problem
{
string ItemName {get; set;}
...
}
public partial class AddItemForm : BaseForm, IItem
{
...
// I don't have to implement IItem here, because it is implement in BaseForm
}
问题在于IBaseForm 的继承；我必须继承它两次。 在我的代码中：
IItem view = new AddItemForm();
view.FormText = "Add new item";
如果我从 IItem 中删除继承，view.FormText 将不可见。如果我从 BaseForm 中删除继承，我必须在每个 AddItemForm 中实现 IBaseForm。我只展示了一个 itemForm，但它很多，而且我必须多次实现。
我该如何解决这个问题？
I have a base windows forms class which contains two buttons: Ok and Cancel. This base form implements the interface IBaseForm:
public interface IBaseForm
{
string FormText {get;set;}
DialogResult ShowView(IWin32Window owner);
}
public partial class BaseForm : IBaseForm
{
...
}
Next I have a window class which inherits from BaseForm and implements another interface IItem:
public interface IItem : IBaseForm // here is problem
{
string ItemName {get; set;}
...
}
public partial class AddItemForm : BaseForm, IItem
{
...
// I don't have to implement IItem here, because it is implement in BaseForm
}
The problem is with the inheritance of IBaseForm; I have to inherit it two times.
In code I have:
IItem view = new AddItemForm();
view.FormText = "Add new item";
If I remove inheritance from IItem, view.FormText will be not visible. If I remove the inheritance from BaseForm I have to implement IBaseForm in each AddItemForm. I've only showed one itemForm but it is a lot, and I have to implement this many times.
How I can resolve this problem?
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评论（2）
没有其他方法可以做到这一点。 BaseForm 是一个类，而 IItem 是一个不相关的接口。两者都不是另一个的“超级”或“基础”，因此您需要从它们中的 IBaseForm 继承。
There isn't another way to do this. BaseForm is a class, whereas IItem is an unrelated interface. Neither is a 'super' or 'base' of the other, so you need to inherit from IBaseForm in both of them.
我不太明白这个问题；您编写的代码可以像您编写的那样编译并运行得很好。
AddItemForm继承了BaseForm对IBaseForm的实现，因此不必重新实现IBaseForm。I don't really understand the problem; the code you've written compiles and runs just fine as you've written it.
AddItemForminheritsBaseForm's implementation ofIBaseForm, so doesn't have to re-implementIBaseForm.