Question

我如何在<条码>ComboBox和<条码>之间工作具有基本约束力。 ObservableCollection? 我只能拿错误的信息。

VB:

Class MainWindow
    Dim Units As New ObservableCollection(Of String)

    Private Sub Window_Loaded(sender As System.Object, e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
        Units.Clear()
        Units.Add("in")
        Units.Add("mm")
        Units.Add("cm")
    End Sub
End Class

XAML:

<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
    <ComboBox Height="59" HorizontalAlignment="Left" Margin="136,96,0,0" Name="ComboBox1" VerticalAlignment="Top" Width="319"
              ItemsSource="{Binding Units}"/>
</Grid>

不管我做什么,<条码>ComboBox似乎总是空洞的,在座标上有一个错误的信息:

系统。视窗。数据错误:40 不动产单位,未在标的Maindow(Name= )上找到。约束性表达: Path=Units; DataItem= MainWindow(Name= );具体目标要素是ComboBox(Name=ComboBox1);目标财产是项目来源(类型IE

Answer 1

在XAML中,改名为{具有约束力的},或等同,{具有约束力的路径=}:

<ComboBox Height="59" HorizontalAlignment="Left" Margin="136,96,0,0" Name="ComboBox1" VerticalAlignment="Top" Width="319" ItemsSource="{Binding}"/>

根据背书的代码,将数据背景明确表述给标人。

ComboBox1.DataContext = Units;

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