<t> t集成inotifypropertychanged
时间: 2023-09-01 07:08:28 浏览: 34
如果您想在您的.NET应用程序中集成INotifyPropertyChanged,您可以遵循以下步骤:
1. 在您的类中实现INotifyPropertyChanged接口
```csharp
public class MyClass : INotifyPropertyChanged
{
// ...
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
```
2. 在您的属性setter中调用NotifyPropertyChanged方法
```csharp
private string _myProperty;
public string MyProperty
{
get { return _myProperty; }
set
{
_myProperty = value;
NotifyPropertyChanged(nameof(MyProperty));
}
}
```
这样,当MyProperty的值发生变化时,PropertyChanged事件将被触发并通知任何订阅它的对象。
相关问题
listbox绑定ObservableCollection<string>,以checkbox的形式展示,当选中checkbox时如何将CheckBox的值传入后台,给出代码
您好,以下是将选中的 CheckBox 的值传入后台的代码示例:
XAML 代码:
<ListBox ItemsSource="{Binding Items}">
<ListBox.ItemTemplate>
<DataTemplate>
<CheckBox Content="{Binding}" IsChecked="{Binding IsChecked}" />
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
C# 代码:
public class ItemViewModel : INotifyPropertyChanged
{
private string _text;
private bool _isChecked;
public string Text
{
get { return _text; }
set
{
_text = value;
OnPropertyChanged(nameof(Text));
}
}
public bool IsChecked
{
get { return _isChecked; }
set
{
_isChecked = value;
OnPropertyChanged(nameof(IsChecked));
}
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public class ViewModel
{
public ObservableCollection<ItemViewModel> Items { get; set; }
public ViewModel()
{
Items = new ObservableCollection<ItemViewModel>
{
new ItemViewModel { Text = "Item 1" },
new ItemViewModel { Text = "Item 2" },
new ItemViewModel { Text = "Item 3" }
};
}
public void Save()
{
var selectedItems = Items.Where(x => x.IsChecked).Select(x => x.Text);
// 将选中的项传入后台进行处理
}
}
在 ViewModel 中,我们可以通过 Items 属性获取 ListBox 中的所有项,并通过 LINQ 查询选中的项。在 Save 方法中,我们可以将选中的项传入后台进行处理。
wpf listbox中添加checkbox实现多选,listbox绑定的数据源是list<string>,并将选中的值传入后台,使用mvvm模型,给出示例代码
可以使用以下代码实现:
在 XAML 中:
<ListBox ItemsSource="{Binding MyList}">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<CheckBox IsChecked="{Binding IsSelected}" />
<TextBlock Text="{Binding}" />
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
在 ViewModel 中:
public class MyViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private List<MyItem> _myList;
public List<MyItem> MyList
{
get { return _myList; }
set
{
_myList = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(MyList)));
}
}
public ICommand SaveCommand { get; }
public MyViewModel()
{
MyList = new List<MyItem>
{
new MyItem { Text = "Item 1" },
new MyItem { Text = "Item 2" },
new MyItem { Text = "Item 3" }
};
SaveCommand = new RelayCommand(Save);
}
private void Save()
{
var selectedItems = MyList.Where(x => x.IsSelected).Select(x => x.Text);
// 将选中的值传入后台
}
}
public class MyItem : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private bool _isSelected;
public bool IsSelected
{
get { return _isSelected; }
set
{
_isSelected = value;
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(nameof(IsSelected)));
}
}
public string Text { get; set; }
}
其中,RelayCommand 是一个实现了 ICommand 接口的类,用于绑定按钮的 Command 属性。