C#Wpf编辑Datagrid不会更新它的itemsource [英] C# Wpf Editing Datagrid does not update it's itemsource

问题描述

我有一个像这样的ObservableCollection，

I have an ObservableCollection like this,

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，

I'm setting Datagrid's itemsource like this,

FoundItemsDatagrid.ItemsSource = Found_Items;

我在Datagrid中有一个这样的复选框，

I have a checkbox in Datagrid like this,

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

我想要，每当我选中或取消选中datagrid上的复选框时，它都应该更新我的ObservableCollection.

I want, whenever i check or uncheck the checkbox on datagrid it should update my ObservableCollection.

最简单的方法是什么?

谢谢..

推荐答案

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

The problem is how you are binding to your collection. You are setting the ItemsSource explicitly therefore the ObservableCollection will not work the way you want it to.

而不是像这样使用绑定:

Instead use binding like so:

<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>

然后确保您在后台执行此操作:

Then ensure you do this in the background:

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

要反映每个项目的更改，您需要像这样使用INotifyPropertyChanged:

For the changes of each item to be reflected you need to use INotifyPropertyChanged like so:

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.

Now when an item is changed by the users the change can be seen in the ObservableCollection. This is thanks to that INotifyPropertyChanged.

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