c# - 如何在绑定(bind)到 ObjectDataProvider 时删除 ListView 中的所有项目

Question

我将一个 ListView 绑定(bind)到 ObjectDataProvider。我从用户那里获取了一些值并在运行时更改了我的 ObjectDataProvider，但是当我的 ObjectDataProvider 更新了它的所有 Item 添加到 ListView 并替换它们时。我使用这个语句:

lstUsers.Items.Clear();

但是我得到这个错误:

Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead.

当它绑定(bind)到 ObjectDataProvider 时，如何从 ListView 中删除所有数据？

谢谢

编辑 1):这是我的代码:

public partial class Page_ObjectDataProvider : Window
{
    public Page_ObjectDataProvider()
    {
        InitializeComponent();
    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {

    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        int myValue =10;
        ((ObjectDataProvider)this.FindResource("ADUsers")).MethodParameters.Clear(); 
        ((ObjectDataProvider)this.FindResource("ADUsers")).MethodParameters.Add(myValue);
        ((ObjectDataProvider)this.FindResource("ADUsers")).Refresh(); 
    }
}

public class CustomData
{
    public int F1 { get; set; }
    public int F2 { get; set; }
    public string F3 { get; set; }
}

public class RetrievCustomData : List<CustomData>
{
    public RetrievCustomData GetSome(int i)
    {
        for (int j = 0; j < i; j++)
        {
            CustomData cd = new CustomData();
            Random rnd = new Random();
            cd.F1 = j;
            cd.F2 = rnd.Next(i);
            cd.F3 = "nima";
            this.Add(cd);
        }

        return this;
    }
}

和 XAML:

<Window x:Class="TestWPF.Page_ObjectDataProvider"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:src="clr-namespace:TestWPF"
    xmlns:sys="clr-namespace:System;assembly=mscorlib"
    Title="ObjectDataProvider" Height="362" Width="360" Loaded="Window_Loaded">
<Window.Resources>
    <ObjectDataProvider x:Key="ADUsers" ObjectType="{x:Type src:RetrievCustomData}"
                MethodName="GetSome">
        <ObjectDataProvider.MethodParameters>
            <sys:Int32>20</sys:Int32>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
</Window.Resources>
<Grid>
    <ListView x:Name="lstUsers"
            ItemsSource="{Binding Source={StaticResource ADUsers}}" Margin="0,0,0,106">
        <ListView.View>
            <GridView>
                <GridViewColumn Header="User Name"
                        Width="80"
                        DisplayMemberBinding="{Binding Path=F1}" />
                <GridViewColumn Header="Group Distinguished Name"
                        Width="80"
                        DisplayMemberBinding="{Binding Path=F3}" />
                <GridViewColumn Header="Group Distinguished Name"
                        Width="80"
                        DisplayMemberBinding="{Binding Path=F2}" />
            </GridView>
        </ListView.View>
    </ListView>
    <Button Content="Get" Height="58" HorizontalAlignment="Left" Margin="64,253,0,0" Name="button1" VerticalAlignment="Top" Width="179" Click="button1_Click" />
</Grid>

如果我将 DataContext 或我的 ObjectDataProvider 设置为空，那么它不会再次绑定(bind)。只是我想更新 ObjectDataProvider 并将新值绑定(bind)到我的 ListView

Answer 1

您可以清除 ListView 的 ItemsSource 属性以清除项目。

lstUsers.ClearValue(ListView.ItemsSourceProperty);