我有这个基类:
public class BaseViewModel : INotifyPropertyChanged
{
protected void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
还有一个类:
public class SchemaDifferenceViewModel : BaseViewModel
{
private string firstSchemaToCompare;
public string FirstSchemaToCompare
{
get { return firstSchemaToCompare; }
set
{
firstSchemaToCompare = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("FirstSchemaToCompare"));
//StartCommand.RaiseCanExecuteChanged();
}
}
}
PropertyChanged 在这里 ( 2Times ),红色下划线,它说:
Error 1 The event BaseViewModel.PropertyChanged' can only appear on the left hand side of += or -= (except when used from within the type 'SchemaDifferenceFinder.ViewModel.BaseViewModel')
我做错了什么?我只将 PropertyChangedEvent 扫到一个新类:BaseViewModel..
最佳答案
您不能在声明它的类之外引发事件,使用基类中的方法来引发它(使 OnPropertyChanged
protected
).
关于c# - 从一个实现 INotifyPropertyChanged 的基类继承?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9077106/