c# - 通知按钮 DataBind 更改

Question

我已将此属性数据绑定到按钮，如下所示，当其他布尔属性更新时如何通知按钮以便再次检查？

数据绑定属性

public bool AccountSelectedAndBankFileSelected
{
    get
    {
        return SelectedAccount != null && SelectedAccount.BankFileSelected;
    }
}

按钮

<Button Content="Open bank." IsEnabled="{Binding AccountSelectedAndBankFileSelected}" />

BankFileSelected 属性

public bool BankFileSelected
{
    get { return _bankFileSelected; }
    set { _bankFileSelected = value; OnPropertyChanged("BankFileSelected"); }
}

Answer 1

你有两个选择。您可以将 更改AccountSelectedAndBankFileSelected为依赖属性，也可以实现INotifyPropertyChanged接口。第二个可能是最简单的。你要做的是实现这个接口。然后，当任何决定结果的属性AccountSelectedAndBankFileSelected发生变化时（因此SelectedAccount和SelectedAccount.BankFileSelected属性），您将引发INotifyPropertyChanged接口定义的事件。

Answer 2

View不知道该属性是否已更改。您应该在setter中调用RaisePropertyChanged("AccountSelectedAndBankFileSelected")（或NotifyPropertyChanged("AccountSelectedAndBankFileSelected")） ：SelectedAccount.BankFileSelected

    public bool BankFileSelected
    {
        get
        {
            return bankFileSelected;
        }
        set
        {
            bankFileSelected= value;
            yourViewModel.RaisePropertyChanged("AccountSelectedAndBankFileSelected");
        }
    }