英文:
Wpf usercontrol base, cannot create an instance
问题
我添加了一个Usercontrol基类
我的基类
public class UserControlBase : UserControl
{
protected IAppLogic app;
public MainWindow CurrentWindow
{
get
{
return (App.Current.MainWindow as MainWindow);
}
}
public UserControlBase()
{
var _app = IoC.Kernel.Get<IAppLogic>();
this.app = _app;
}
public void MainNavigate(Pages.PageBase p)
{
CurrentWindow.MainFrame.Content = p;
}
}
但是设计没有显示出来。
英文:
I add an Usercontrol base class
my Base Class
public class UserControlBase : UserControl
{
protected IAppLogic app;
public MainWindow CurrentWindow{
get{
return (App.Current.MainWindow as MainWindow);
}
}
public UserControlBase()
{
var _app = IoC.Kernel.Get<IAppLogic>();
this.app = _app;
}
public void MainNavigate(Pages.PageBase p)
{
CurrentWindow.MainFrame.Content = p;
}
}
but the design does not shown
答案1
得分: 1
浏览了一些其他问题,我找到了一些可能发生这种情况的原因
问题1 WPF Designer “Could not create an instance of type”
- 在你的构造函数中将代码包裹在这个条件中:
if(!System.ComponentModel.DesignerProperties.GetIsInDesignMode(this))
{
// 产生异常的代码
}
- 基类是抽象类型
- 在加载自定义控件时,在你的构造函数中抛出了异常。这回溯到第1点。
请分享堆栈跟踪以便我们提供更多帮助。
英文:
Browsing around some of the other questions, I found some of the reasons this can happen
Q1 WPF Designer “Could not create an instance of type”
- Suround the code in your constructor with this:
if(!System.ComponentModel.DesignerProperties.GetIsInDesignMode(this))
{
//code producing exception
}
- The base class is of the abstract type
- An exception is thrown in your constructor while loading the custom control. This goes back to 1.
Please share the stacktrace for us to help more.
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