Silverlight DataGrid 列绑定到对象不刷新

发布于 2024-11-09 15:09:45 字数 372 浏览 0 评论 0原文

我已将 DataGrid 绑定到 IEnumerable<对象>。对象具有 EntityCollection<访问>属性，它是名称 Accesses。然后我把这

    <sdk:DataGridTextColumn
                 Binding="{Binding Path=Accesses, Converter={StaticResource AccessesToTextConverter}}"
                 Header="Access"/>

一切工作正常。但是，当我将 Access 对象添加到视图模型中的 Accesses 时，DataGrid 也不会刷新。为什么？ :)

原文

I have bound DataGrid to IEnumerable< Object >. Object has EntityCollection< Access > property and it is name Accesses. Then in I put this

    <sdk:DataGridTextColumn
                 Binding="{Binding Path=Accesses, Converter={StaticResource AccessesToTextConverter}}"
                 Header="Access"/>

All work fine. But when I add Access object to Accesses in my viewmodel DataGrid does nor refresh. Why? :)

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樱花细雨 2024-11-16 15:09:45

您正在将项目添加到 IEnumerable 集合中，数据网格不会对其执行任何操作。绑定到的集合必须实现 INotifyCollectionChanged 才能使数据网格自动更新。

如果您使用的集合将 RIA 服务结果保存为对象集合中的属性，并指定为 ItemsSource，请确保将 CollectionChanged 事件连接到对象的 PropertyChanged 事件，如下所示：

    public EntityCollection accesses;
    public EntityCollection Accesses
    {
        get { return accesses; }
        set
        {
            OnPropertyChanged("Accesses");
            value.CollectionChanged += (sender, e) => { OnPropertyChanged("Accesses"); };
            accesses = value;
        }
    }

You are adding items to a IEnumerable collection which the datagrid will not do anything with. Your collection you bind to must implement INotifyCollectionChanged for the datagrid to automatically update.

If you are using a collection which holds your RIA services results as a property in an object collection that gets assigned as your ItemsSource, make sure you hookup the CollectionChanged event to the PropertyChanged event of your object like so:

    public EntityCollection accesses;
    public EntityCollection Accesses
    {
        get { return accesses; }
        set
        {
            OnPropertyChanged("Accesses");
            value.CollectionChanged += (sender, e) => { OnPropertyChanged("Accesses"); };
            accesses = value;
        }
    }

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冷了相思 2024-11-16 15:09:45

您需要为模式指定 TwoWay，以便从代码更新 UI：

<sdk:DataGridTextColumn                 
    Binding="{Binding Path=Accesses, Mode=TwoWay, Converter={StaticResource AccessesToTextConverter}}"  Header="Access"/>

You need to specify TwoWay for the mode in order to update the UI from the code for one thing:

<sdk:DataGridTextColumn                 
    Binding="{Binding Path=Accesses, Mode=TwoWay, Converter={StaticResource AccessesToTextConverter}}"  Header="Access"/>

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