Question

我偶然发现了一个问题，并希望有人能够帮我解决问题。

我有一个带有一些UserControls的程序集。我希望在运行时从该外部程序集加载UserControl（稍后将其截屏，而不在屏幕上显示）。

UserControl xaml

<UserControl x:Class="MyAssembly.Test"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Grid>
        <Button x:Name="TD1"
                Height="30"
                Width="100"
                Content="{Binding ABC}"/>
    </Grid>
</UserControl>

＆＃34;查看模型＆＃34;

public class TestClass : INotifyPropertyChanged
{
    private string _abc = "Initial value";

    public event PropertyChangedEventHandler PropertyChanged;

    public string ABC
    {
        get
        {
            return _abc;
        }
        set
        {
            if (value == _abc)
            {
                return;
            }
            _abc = value;
            OnPropertyChanged1("ABC");
        }
    }

    protected virtual void OnPropertyChanged1(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

导致头痛的代码

Assembly.LoadFrom("MyAssembly.dll");
var uri = new Uri(@"/MyAssembly;component/Test.xaml"), UriKind.Relative);
var view = (Control)Application.LoadComponent(uri);
view.Width = 800;
view.Height = 600;
view.RenderSize = new Size(800, 600);
view.Background = Brushes.White;

var viewModel = new TestClass();
view.DataContext = viewModel;
viewModel.ABC = "7";

然而，在设置DataContext和改变ABC属性时，TD1内容都没有改变。它始终保持为空（如果我用调试器查看它）。

如何根据从外部程序集加载的xaml强制.Net进行绑定（在本例中为ABC）？

Answer 1

好吧，我找到了make bindings的工作方式。所有人需要做的就是在视图上调用UpdateLayout。

Assembly.LoadFrom("MyAssembly.dll");
var uri = new Uri(@"/MyAssembly;component/Test.xaml"), UriKind.Relative);
var view = (Control)Application.LoadComponent(uri);
view.Width = 800;
view.Height = 600;
view.RenderSize = new Size(800, 600);
view.Background = Brushes.White;

var viewModel = new TestClass();
view.DataContext = viewModel;
viewModel.ABC = "7";

view.UpdateLayout();

WPF UserControl绑定失败

1 个答案: