Question

全部 - 尝试做两件事：我有一个简单的应用程序，我正在尝试将我的Viewmodel集合绑定到我的视图。考虑到两种方法，但我两个都陷入困境：

方法1：使用Grid作为容器来绑定textblock属性。

方法2：将对象的属性直接绑定到我视图上的文本块（不使用网格作为容器及其Datacontext属性）

Rule_Model_1.cs

public class Rule_Model_1
{
    public string topMessage { get; set; }
    public List<string> recipients { get; set; }
    public string bottomMessage { get; set; }
    public string hypLink { get; set; }
    public OCCBlock blockType { get; set; }

    public enum OCCBlock
    {
        HardBlock,
        SoftBlock,
        ModifyAndSend
    }
}

Rule_VM_1.cs

class Rule_VM_1
{
    #region Properties
    public List<Rule_Model_1> rule { get; set; }
    #endregion

    #region Constructor
    public Rule_VM_1()
    {
        #region Initializing a Rule
        rule = new List<Rule_Model_1>();

        rule.Add(new Rule_Model_1()
        {
            topMessage = "Lorem ipsum dolor sit amet.",
            recipients = new List<string> {"pr@hotmail.com", "pra@gmail.com"},
            bottomMessage = "Lorem ipsum dolor sit amet",
            hypLink = "http://www.abc.com",
            blockType = Rule_Model_1.OCCBlock.HardBlock
        });
        #endregion
    }
    #endregion
}

Rule_UI.xaml.cs

public partial class Rule_UI_1 : UserControl
{
    Rule_VM_1 rulevm1;
    public Rule_UI_1()
    {
        InitializeComponent();
        rulevm1 = new Rule_VM_1();
        DataContext = rulevm1; 
    }
}

Rule_UI.xaml

  <UserControl x:Class="OCC_WPF_POC.Rule_UI_1"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         mc:Ignorable="d">
<GroupBox Header="Rule Details">
    <Grid HorizontalAlignment="Center" VerticalAlignment="Center">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"></ColumnDefinition>
            <ColumnDefinition Width="*"></ColumnDefinition>
        </Grid.ColumnDefinitions>


        <Grid Grid.Column="1" DataContext="{Binding rule}">
            <Grid.RowDefinitions>
                <RowDefinition Height="50"></RowDefinition>
                <RowDefinition Height="200"></RowDefinition>
                <RowDefinition Height="50"></RowDefinition>
            </Grid.RowDefinitions>
            <TextBlock Grid.Row="0" Text="{Binding topmessage}" />
        </Grid>
    </Grid>
</GroupBox>

该视图仍未显示任何内容。同样如上所述 - 我如何使两种方法都有效？非常感谢任何代码示例

附加图片 Window Image

Answer 1

问题是您需要一个列表视图来绑定到集合属性（rule）。这应该有效：

<ListBox Grid.Column="1" ItemsSource="{Binding rule}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding topmessage}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

要绑定到网格，您可以使用索引器DataContext设置[]：

<Grid Grid.Column="1" DataContext="{Binding rule[0]}">
    <TextBlock Grid.Row="0" Text="{Binding topmessage}" />
</Grid>

没有网格：

<TextBlock Text="{Binding rule[0].topmessage}" />

无法绑定到我的ViewModel的集合

1 个答案: