Question

我正在创建一个WPF应用程序。

我有一个View，它实现了两个不同的User-Controls。每个控件的数据上下文需要相同，因为当我在一个控件中更改值时，它应该影响另一个控件。只要在视图中选择日期，就应该为每个控件设置DataContext（这是一个信息列表）。我已经尝试将List绑定到Control。什么样的工作。列表框显示有元素，但内容不可见。

<ListView x:Name="ListViewEmployees" ItemsSource="{Binding Employees}">
    <ListView.Items>
        <Label x:Name="EmployeeId" Content="{Binding Path=EmployeeId}" Visibility="Collapsed" />
        <Label x:Name="ShortForm" Content="{Binding Path=ShortForm}" Width="40"/>
        <Label x:Name="Degree" Content="{Binding Path=Degree}" Width="90"/>
        <Label x:Name="WorkingHours" Content="{Binding Path=WorkingHours}" Width="30"/>
    </ListView.Items>
</ListView>

所以我的问题是，只要我将日期传递给我的控制器，他就会从数据库中获取所需的信息，以便将List传递给我的用户控件。我是否需要创建一个由UserControls实现的接口？

我经常使用MVVM模式。但对于这所大学的事情，我们必须使用mvc。一点建议会很棒。

欢呼声

Answer 1

<ListView x:Name="ListViewEmployees" ItemsSource="{Binding Employees}">
    <ListView.Items>
        <Label ...

您已将ListView的ItemsSource绑定到Employee对象的集合，然后立即尝试使用Label对象填充它。这不起作用 - 如果您的ItemsSource绑定到集合，您只需在VM /控制器中填充该集合，不手动指定XAML项目。最接近我认为您尝试做的事情是使用DataTemplate显示每个Employee对象的属性：

<ListView x:Name="ListViewEmployees" ItemsSource="{Binding Employees}">
    <ListView.ItemTemplate>
        <DataTemplate>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>

                <Label Grid.Column="0" x:Name="EmployeeId" Content="{Binding Path=EmployeeId}" Visibility="Collapsed" />
                <Label Grid.Column="1" x:Name="ShortForm" Content="{Binding Path=ShortForm}" Width="40"/>
                <Label Grid.Column="2" x:Name="Degree" Content="{Binding Path=Degree}" Width="90"/>
                <Label Grid.Column="3" x:Name="WorkingHours" Content="{Binding Path=WorkingHours}" Width="30"/>
            </Grid>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

对于我的测试用例，我创建了一个名为Employee的垃圾类，其属性名称与您的属性相匹配，然后创建了一个ObservableCollection，然后用测试值填充它。绑定照顾其余部分。

/// <summary>
/// The <see cref="Employees" /> property's name.
/// </summary>
public const string EmployeesPropertyName = "Employees";

private ObservableCollection<Employee> _employees = null;

/// <summary>
/// Sets and gets the Employees property.
/// Changes to that property's value raise the PropertyChanged event. 
/// </summary>
public ObservableCollection<Employee> Employees
{
    get
    {
        return _employees;
    }

    set
    {
        if (_employees == value)
        {
            return;
        }

        _employees = value;
        RaisePropertyChanged(EmployeesPropertyName);
    }
}


/// <summary>
/// Initializes a new instance of the MainViewModel class.
/// </summary>
public MainViewModel()
{
    Employees = new ObservableCollection<Employee>();

    Employees.Add(new Employee { EmployeeId = 1, Degree = "TestDegree1", ShortForm = "TestShortForm1", WorkingHours = 8 });
    Employees.Add(new Employee { EmployeeId = 2, Degree = "TestDegree2", ShortForm = "TestShortForm2", WorkingHours = 7 });
    Employees.Add(new Employee { EmployeeId = 3, Degree = "TestDegree3", ShortForm = "TestShortForm3", WorkingHours = 6 });
    Employees.Add(new Employee { EmployeeId = 4, Degree = "TestDegree4", ShortForm = "TestShortForm4", WorkingHours = 5 });
    Employees.Add(new Employee { EmployeeId = 5, Degree = "TestDegree5", ShortForm = "TestShortForm5", WorkingHours = 4 });
}

用于两个UserControl的MVC WPF DataContext

1 个答案: