Windows 窗体用户控件设计时属性
我正在与用户控件作斗争。我有一个代表寻呼机的 UserControl，它有一个以这种方式公开的 Presenter 对象属性：
[Browsable(false)]
[DesignSerializationAttribute(DesignSerializationAttribute.Hidden)]
public object Presenter { get; set; }
代码本身可以工作，因为我可以将控件拖放到 Windows From 中，而无需 Visual Studio 初始化此属性。 现在，因为在此控件的 Load 事件中，我调用了 Presenter 的一个方法，该方法在运行时为 null ...我引入了以下附加代码：
public override void OnLoad(...)
{
if (this.DesignMode)
{
base.OnLoad(e);
return;
}
presenter.OnViewReady();
}
现在，每次我打开包含此 UserControl 的窗口时，Visual Studio 都会修改Windows 设计器代码。所以，一旦我打开它，VS就会问我是否要保存它...当然，如果我向窗口添加一个控件，它不会保留更改...一旦我删除了UserControl Pager 问题消失... 我应该如何以正确的方式解决这个问题？我只是不希望演示者属性在设计时初始化，因为它是在运行时注入的......
I am struggling with a UserControl. I have a UserControl that represent a Pager and it has a Presenter object property exposed in this way:
[Browsable(false)]
[DesignSerializationAttribute(DesignSerializationAttribute.Hidden)]
public object Presenter { get; set; }
The code itself works as I can drag and drop a control into a Windows From without having Visual Studio initializing this property.
Now, because in the Load event of this control I call a method of the Presenter that at run-time is null ... I have introduced this additional code:
public override void OnLoad(...)
{
if (this.DesignMode)
{
base.OnLoad(e);
return;
}
presenter.OnViewReady();
}
Now, every time I open a Window that contains this UserControl, Visual Studio modifies the Windows designer code. So, as soon as I open it, VS ask me if I want to save it ... and of course, if I add a control to the Window, it doesn't keep the changes ... As soon as I remove the UserControl Pager the problem disappears ...
How should I tackle that in the proper way? I just don't want that the presenter property is initialized at design time as it is injected at runtime ...
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当 VS 尝试生成设计器代码时，您可能会遇到异常。
将 VS 的第二个副本附加到设计器，打开 Break On Exceptions，然后看看发生了什么。
You're probably getting an exception when VS tries to generate the designer code.
Attach a second copy of VS to the designer, turn on Break On Exceptions, and see what's going on.
因此，包含 UserControl 的 Windows 窗体设计器抛出异常：
此错误的实例 (1)
at System.ComponentModel.Design.Serialization .CodeDomSerializerBase.Error（IDesignerSerializationManager 管理器，字符串异常文本，字符串helpLink）
在 System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression（IDesignerSerializationManager 管理器，字符串名称，CodeExpression 表达式）
在 System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression（IDesignerSerializationManager 管理器，字符串名称，CodeExpression 表达式）
在 System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement（IDesignerSerializationManager 管理器，CodeStatement 语句）
So the exception is thrown by the Designer of the Windows form that contains the UserControl:
Instances of this error (1)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.Error(IDesignerSerializationManager manager, String exceptionText, String helpLink)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeExpression(IDesignerSerializationManager manager, String name, CodeExpression expression)
at System.ComponentModel.Design.Serialization.CodeDomSerializerBase.DeserializeStatement(IDesignerSerializationManager manager, CodeStatement statement)