C# 什么'；当我使用errorProvider.SetIconAlignment时，目标控件上发生了一种事件

当我使用

errorProvider.SetIconAlignment（）

方法时，有人知道目标控件上发生了什么类型的事件吗

例如：

当我调用

errorProvider.SetIconAlignment（mytextbox1，ErrorIconAlignment.MiddleRight）时

在mytextbox1上，我希望在调用SetIconAlignment时捕获此事件？
我没有看到ErrorProvider可能正在使用的事件。事实上，我找不到任何与此相关的事件

根据我在ErrorProvider中使用的内容，除了扩展该方法之外，没有其他方法，如下所示：

// Defines an extended version of the ErrorProvider
public class ExtendedErrorProvider : ErrorProvider, INotifyPropertyChanging, INotifyPropertyChanged
{
    // That will replace the SetIconAlignment from the base class when you call it from outside the class
    public void SetIconAlignment(Control control, ErrorIconAlignment value)
    {
        // Will raise an event just before changing the property
        OnPropertyChanging("IconAlignment");
        // Changed the property using the base class
        base.SetIconAlignment(control, value);
        // Will raise an event just after the property has changed
        OnPropertyChanged("IconAlignment");
    }

    // This will ensure that whenever you bind methods to be called on the PropertyChanging, they will get called for the specific property...
    protected void OnPropertyChanging(string property) { if (PropertyChanging != null) PropertyChanging(this, new PropertyChangingEventArgs(property)); }
    public event PropertyChangingEventHandler PropertyChanging;
    // This will ensure that whenever you bind methods to be called on the PropertyChanged, they will get called for the specific property...
    protected void OnPropertyChanged(string property) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(property)); }
    public event PropertyChangedEventHandler PropertyChanged;
}

errorProvider1.PropertyChanging += WhatNeedsToBeDoneBeforeChanging(...);
errorProvider1.PropertyChanged += WhatNeedsToBeDoneAfterChanging(...);

现在，在本课程之外，您可以执行以下操作：

// Defines an extended version of the ErrorProvider
public class ExtendedErrorProvider : ErrorProvider, INotifyPropertyChanging, INotifyPropertyChanged
{
    // That will replace the SetIconAlignment from the base class when you call it from outside the class
    public void SetIconAlignment(Control control, ErrorIconAlignment value)
    {
        // Will raise an event just before changing the property
        OnPropertyChanging("IconAlignment");
        // Changed the property using the base class
        base.SetIconAlignment(control, value);
        // Will raise an event just after the property has changed
        OnPropertyChanged("IconAlignment");
    }

    // This will ensure that whenever you bind methods to be called on the PropertyChanging, they will get called for the specific property...
    protected void OnPropertyChanging(string property) { if (PropertyChanging != null) PropertyChanging(this, new PropertyChangingEventArgs(property)); }
    public event PropertyChangingEventHandler PropertyChanging;
    // This will ensure that whenever you bind methods to be called on the PropertyChanged, they will get called for the specific property...
    protected void OnPropertyChanged(string property) { if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(property)); }
    public event PropertyChangedEventHandler PropertyChanged;
}

errorProvider1.PropertyChanging += WhatNeedsToBeDoneBeforeChanging(...);
errorProvider1.PropertyChanged += WhatNeedsToBeDoneAfterChanging(...);

事件是好的…我在考虑更多关于观察者/可观察者的问题…但答案很好。基于ErrorProvider构建自己的扩展类是个好主意。但当错误图标设置为mytextbox1时，似乎并没有办法跟踪事件？是的，有办法。从代码项目中签出。在那里，他们使用IPropertyNotification的自定义实现来传递其他参数以及属性名称（如旧值和新值，或者在您的场景中，对象/控件本身）。