CodeGo.net>用户控件作为带有绑定的数据模板

我有一个ItemsControl,并将ItemsSource绑定到SystemModels列表.它必须为列表中的每个系统生成一个用户控件.在这些用户控件中,它具有一些文本框,显示系统的名称,名称和位置.

我的代码创建了用户控件,但没有填充用户控件中的文本框.

视图：

<UserControl x:Name="SystemListScreen">
        <ScrollViewer Grid.Row="1">
                <ItemsControl x:Name="SystemList" ItemsSource="{Binding Path=Systems}">
                    <ItemsControl.ItemsPanel>
                        <ItemsPanelTemplate>
                            <UniformGrid Columns="4"/>
                        </ItemsPanelTemplate>
                    </ItemsControl.ItemsPanel>
                    <ItemsControl.ItemTemplate>
                        <DataTemplate DataType="SystemModel">
                        <Widgets:MultiLineButton partID="{Binding ID}"
                                                    company="{Binding ItemsSource.Company}"
                                                    typeSorter="{Binding ItemsSource.Name, ElementName=SystemList}"
                                                    typeLocation="{Binding ItemsSource.Location, ElementName=SystemList}"
                                                    buttonCommand="{Binding DataContext.navigateInspectList, ElementName=SystemListScreen}"
                                                    buttonCommandParameter="{Binding ItemsSource.ID, ElementName=SystemList}"/>
                        <!--<Button Content="{Binding ID}"/>-->
                    </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
        </ScrollViewer>
</UserControl>

ViewModel：

private List<SystemModel> systems;

public SystemListViewModel()
{
    Systems = new List<SystemModel>();
    Systems = SystemAPI.Instance.GetSystems();
}

public string App { get; set; }

public List<SystemModel> Systems 
{ 
    get { return systems; }
    private set 
    {
        systems = value;
        NotifyChanged("systems");
        NotifyChanged("NoResultsFound");
    } 
}

多行按钮代码：

        public static readonly DependencyProperty buttonCommandProperty = DependencyProperty.Register("buttonCommand", typeof(ICommand), typeof(MultiLineButton));
    public static readonly DependencyProperty buttonCommandParameterProperty = DependencyProperty.Register("buttonCommandParameter", typeof(Object), typeof(MultiLineButton));
    public static readonly DependencyProperty partIDProperty = DependencyProperty.Register("partID", typeof(String), typeof(MultiLineButton));
    public static readonly DependencyProperty companyProperty = DependencyProperty.Register("company", typeof(String), typeof(MultiLineButton));
    public static readonly DependencyProperty typeSorterProperty = DependencyProperty.Register("typeSorter", typeof(String), typeof(MultiLineButton));
    public static readonly DependencyProperty typeLocationProperty = DependencyProperty.Register("typeLocation", typeof(String), typeof(MultiLineButton));

    public MultiLineButton()
    { 
        this.DataContext = this;

        InitializeComponent();
    }

    public String partID
    {
        get { return (String)GetValue(partIDProperty); }
        set { SetValue(partIDProperty, value); }
    }

    public String company
    {
        get { return (String)GetValue(companyProperty); }
        set { SetValue(companyProperty, value); }
    }

    public String typeSorter
    {
        get { return (String)GetValue(typeSorterProperty); }
        set { SetValue(typeSorterProperty, value); }
    }

    public String typeLocation
    {
        get { return (String)GetValue(typeLocationProperty); }
        set { SetValue(typeLocationProperty, value); }
    }

    public ICommand buttonCommand
    {
        get { return (ICommand)GetValue(buttonCommandProperty); }
        set { SetValue(buttonCommandProperty, value); }
    }
    public Object buttonCommandParameter
    {
        get { return (Object)GetValue(buttonCommandParameterProperty); }
        set { SetValue(buttonCommandParameterProperty, value); }
    }

什么不起作用：partID =“ {Binding ID}”,company =“ {Binding ItemsSource.Company}”,typeSorter =“ {Binding ItemsSource.Name,ElementName = SystemList}”,typeLocation =“ {Binding ItemsSource.Location,ElementName = SystemList}”和buttonCommandParameter =“ {Binding ItemsSource.ID,ElementName = SystemList}”.

但是,如果我仅使用一个按钮作为带有Content =“ {Binding ID}”的数据模板,则效果很好,如果我在数据模板之外使用usercontrol,它也可以工作.但是它在数据模板内部不起作用.

我得到的错误是这样的：“ BindingExpression路径错误：在’object’“MultiLineButton'(Name =”)’上找不到’Company’属性.BindingExpression：Path = Company; DataItem =’MultiLineButton'(Name =” );目标元素是’MultiLineButton'(Name =”);目标属性是’company'(类型’String’)“

我该如何解决这些绑定问题？

解决方法:

>不确定,也许您应该从DateTemplate中删除DataType =“ SystemModel”.
>或尝试使用简单的文本框(绑定ID)作为DataTemplate,看看是否仍然为空.
>如果上述方法没有帮助您,请尝试Snoop(snoopwpf.codeplex.com)看看发生了什么.

标签：user-controls,datatemplate,wpf,c,mvvm
来源： https://codeday.me/bug/20191030/1966145.html