Question

我们假设我有以下ListView：

<ListView Name="listView">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="IsTrue" DisplayMemberBinding="{Binding Path=IsTrue}"/>
            <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Path=name}" />
        </GridView>
    </ListView.View>
</ListView>

以下我要绑定的Test类：

public class Test
{
    public Test(Boolean IsTrue, string name)
    {
        this.IsTrue = IsTrue;
        this.name = name;
    }

    public Boolean IsTrue { get; set; }
    public string name { get; private set; }
}

这是我用来添加ListViewItem的命令：

Test a = new Test(false, "a");
listView.Items.Add(a);

现在，当我尝试更改对象IsTrue值时，ListView上的值IsTrue将不会更新。为什么会这样？

Answer 1

您必须为类Test实现INotifyPropertyChanged接口，因此当您更改属性时，将通知用户界面。

Answer 2

public class Test : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(PropertyChangedEventArgs args)
    {
        var e = PropertyChanged;
        if (e != null)
            e(this, args);
    }

    private bool isTrue;
    public Boolean IsTrue
    {
        get { return isTrue; }
        set
        {
            if (isTrue == value)
                return;
            isTrue = value;
            OnPropertyChanged(new PropertyChangedEventArgs("IsTrue"));
        }
    }

    public string Name { get; private set; }

    public Test(Boolean isTrue, string name)
    {
        this.isTrue = isTrue;
        Name = name;
    }
}

ListView - 将listviewitem数据绑定到对象

2 个答案: