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C#Wpf编辑数据网格不更新其项源

propertychanged datagrid wpf

Trax · 技术社区 · 11 年前

我有一个这样的ObservableCollection,

ObservableCollection<Item> Found_Items = new ObservableCollection<Item>();

public struct Item
        {
            public bool Enabled { get; set; }
            public BitmapImage ItemIcon { get; set; }
            public string Path { get; set; }
            public string Size { get; set; }
        }

我正在这样设置Datagrid的itemsource,

FoundItemsDatagrid.ItemsSource = Found_Items;

我在Datagrid中有一个这样的复选框,

<DataGridTemplateColumn Header="Path" Width="*" >
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DockPanel> 
                            <CheckBox IsChecked="{Binding Path=Enabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>                         
                        </DockPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>

我希望,每当我选中或取消选中数据网格上的复选框时,它就会更新我的ObservableCollection。

最简单的方法是什么?

谢谢

2 回复 | 直到 11 年前

Kelly 11 年前

问题是如何绑定到集合。您正在显式设置ItemsSource,因此ObservableCollection将无法按您希望的方式工作。

而是像这样使用绑定:

<DataGridTemplateColumn Header="Path" Width="*" ItemsSource="{Binding Found_Items}" >
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <DockPanel> 
                            <CheckBox IsChecked="{Binding Path=Enabled, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>                         
                        </DockPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>

然后确保在后台执行此操作:

public ObservableCollection<Item> Found_Items {get; set;}

为了反映每个项目的更改,您需要使用INotifyPropertyChanged,如下所示:

public class Item : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private bool enabled;
        private BitmapImage itemIcon;
        private string path;
        private string size;


        public string Size
        {
            get { return size; }
            set
            {
                size = value;
                if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Size"));
            }
        }


        public string Path
        {
            get { return path; }
            set
            {
                path = value;
                if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("Path"));
            }
        }


        public BitmapImage ItemIcon
        {
            get { return itemIcon; }
            set
            {
                itemIcon = value;
                if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("ItemIcon"));
            }
        }



        public bool Enabled
        {
            get { return enabled; }
            set
            {
                enabled = value;
                if(PropertyChanged!=null) PropertyChanged(this,new PropertyChangedEventArgs("Enabled"));
            }
        }

    }

现在,当用户更改项目时,可以在ObservableCollection中看到更改。这要归功于INotifyPropertyChanged。

Trax 11 年前

我遵守了指示 HERE .

我像这样将“Item”结构更改为“Item”类;

 public class Item : INotifyPropertyChanged
{
    private bool _Enabled;
    private BitmapImage _ItemIcon;
    private string _Path;
    private string _Size;

    public event PropertyChangedEventHandler PropertyChanged;

    public Item(bool enabled, BitmapImage itemIcon, string path, string size)
    {
        _Enabled = enabled;
        _ItemIcon = itemIcon;
        _Path = path;
        _Size = size;
    }

    public bool Enabled
    {
        get { return _Enabled; }
        set
        {
            _Enabled = value;
            this.NotifyPropertyChanged("Enabled");
        }
    }

    public BitmapImage ItemIcon
    {
        get { return _ItemIcon; }
        set
        {
            _ItemIcon = value;
            this.NotifyPropertyChanged("ItemIcon");
        }
    }

    public string Path
    {
        get { return _Path; }
        set
        {
            _Path = value;
            this.NotifyPropertyChanged("Path");
        }
    }

    public string Size
    {
        get { return _Size; }
        set
        {
            _Size = value;
            this.NotifyPropertyChanged("Size");
        }
    }



    private void NotifyPropertyChanged(string name)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(name));
    }
}

现在一切都很完美。