Question

大家好我想绑定我的列表框取决于组合框所选项目这里是我的代码

       <StackPanel Orientation="Horizontal" >
            <ComboBox Name="cmbID" Width="150"  Margin="10" Height="30" SelectedItem="{Binding CmbSelected,Mode=TwoWay}" DisplayMemberPath="ID" ItemsSource="{Binding MyStudent,Mode=TwoWay}"/>
            <Button Name="btnGetDetail"  Margin="10" Command="{Binding getDetails}" Content="Get Details" Height="30" Width="90"/>
            <TextBox Name="tbName1" Width="90" Height="30" Text="{Binding ElementName=cmbID,Path= SelectedItem.Sub}"></TextBox>
        </StackPanel>

在上面的代码我将我的组合框绑定到一个可观察的集合，并希望将我的ListView绑定到下面的组合框的选定项目是我的代码

 <ListView Name="myStudent" ItemsSource="{Binding CmbSelected,UpdateSourceTrigger=PropertyChanged}"  HorizontalAlignment="Left" Width="420"  Height="150">
            <ListView.View >
                <GridView x:Name="grdStudentDetails">
                    <GridViewColumn Header="ID" DisplayMemberBinding="{Binding ElementName=cmbID,Path=SelectedItem.ID}" Width="30"/>
                    <GridViewColumn Header="Name" DisplayMemberBinding="{Binding ElementName=cmbID,Path =SelectedItem.Name}" Width="100"/>
                    <GridViewColumn Header="RollNum" DisplayMemberBinding="{Binding ElementName=cmbID,Path=SelectedItem.RollNum}" Width="100"/>
                    <GridViewColumn Header="Subject" DisplayMemberBinding="{Binding ElementName=cmbID,Path=SelectedItem.Sub}" Width="100"/>
                    <GridViewColumn Header="PhNumber" DisplayMemberBinding="{Binding ElementName=cmbID,Path=SelectedItem.PhNum}" Width="100"/>
                </GridView>


            </ListView.View>
        </ListView>

我无法找到我在做错的地方，即使我用相同的绑定绑定我的文本框它工作正常。请参阅我的组合框的XAML下面的文本框。

我的viewmodle.cs代码如下

private student cmbSelcted;

    public student CmbSelected
    {
        get { return cmbSelcted; }
        set { cmbSelcted = value; OnPropertyChanged("CmbSelected"); }
    }


    public ObservableCollection<student> MyStudent
    {
        get { return myStudent; }
        set { myStudent = value; OnPropertyChanged("MyStudent"); }
    }

Answer 1

看不到ListView的ItemsSource！希望你把它绑定到一个集合。如果不是 - 尝试这种方法。

<ListView Grid.Row="1" ItemsSource="{Binding SelectedStudents, Mode=OneWay}">
            <ListView.View >
                <GridView x:Name="grdStudentDetails">
                    <GridViewColumn Header="ID" DisplayMemberBinding="{Binding Id}" Width="30"/>
                    <GridViewColumn Header="Name" DisplayMemberBinding="{Binding Name}" Width="100"/>
                    <GridViewColumn Header="RollNum" DisplayMemberBinding="{Binding RollNum}" Width="100"/>
                    <GridViewColumn Header="Subject" DisplayMemberBinding="{Binding Sub}" Width="100"/>
                    <GridViewColumn Header="PhNumber" DisplayMemberBinding="{Binding PhNum}" Width="100"/>
                </GridView>
            </ListView.View>
        </ListView>

视图模型

private Student _cmbSelected;
public Student CmbSelected
{
    get { return _cmbSelected; }
    set
    {
        _cmbSelected = value;
        if (_cmbSelected != null)
        {
            SelectedStudents = new List<Student>() { _cmbSelected };
        }
        else
        {
            SelectedStudents = new List<Student>();
        }
        OnPropertyChanged();
    }
}

private List<Student> _selectedStudents;
public List<Student> SelectedStudents
{
    get { return _selectedStudents; }
    set
    {
        _selectedStudents = value;
        OnPropertyChanged();
    }
}

希望您看到在ListView上拥有ItemsSource很重要。

Answer 2

    <Grid>
        <StackPanel>
            <ListView x:Name="usergrid" Margin="100,50,100,0" HorizontalAlignment="Center" FontSize="20" ItemsSource="{Binding Path=user1}">
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="UserId"       DisplayMemberBinding="{Binding UserId,Mode=TwoWay}" Width="100" ></GridViewColumn>
                        <GridViewColumn Header="First Name"   DisplayMemberBinding="{Binding FirstName,Mode=TwoWay}"  Width="150" />
                        <GridViewColumn Header="Last Name"    DisplayMemberBinding="{Binding LastName,Mode=TwoWay}" Width="150" />
                        <GridViewColumn Header="City"         DisplayMemberBinding="{Binding City,Mode=TwoWay}" Width="150" />
                        <GridViewColumn Header="State"        DisplayMemberBinding="{Binding State,Mode=TwoWay}" Width="150" />
                        <GridViewColumn Header="Country"      DisplayMemberBinding="{Binding Country,Mode=TwoWay}" Width="150" />
                    </GridView>
                </ListView.View>
            </ListView>
        </StackPanel>
    </Grid>

如何绑定ListView值取决于组合框选择的项目？

2 个答案: