为什么 UserControl 会导致序列化错误? [英] Why does a UserControl cause a Serialization error?

问题描述

我的 MainWindow.xaml 中有以下 ComboBox:

I have the following ComboBox in my MainWindow.xaml:

<ComboBox ItemsSource="{Binding ComboItemsProperty}" />

在 MainWindow.xaml.cs 中:

In MainWindow.xaml.cs:

ObservableCollection<string> ComboItemsField = 
    new ObservableCollection<string>();
public ObservableCollection<string> ComboItemsProperty
{
    get { return ComboItemsField; }
    set { ComboItemsField = value; }
}

这很好用！我可以将项目添加到属性并成功序列化 ComboBox 元素.

This works perfectly! I can add items to the Property and successfully Serialize the ComboBox Element.

我的问题是，为什么当我在 UserControl.xaml 和 UserControl.xaml.cs 中有这个 EXACT 代码时，在尝试序列化控件时出现以下错误:

My question is, why is it when I have this EXACT code in a UserControl.xaml and UserControl.xaml.cs, I get the following error on attempting to Serialize the control:

无法序列化泛型类型'System.Collections.ObjectModel.ObservaleCollection'1[System.String]'

Cannot serialize a generic type 'System.Collections.ObjectModel.ObservaleCollection'1[System.String]'

有什么想法吗?

推荐答案

你没有说你是如何成功地将 ComboBox 元素序列化"，但错误是 UserControls 的预期行为.

You don't say how you are "successfully Serializ(ing) the ComboBox Element", but the error is the expected behaviour for UserControls.

XamlWriter(我假设您正在使用)无法序列化绑定，这意味着它将尝试序列化绑定的实际值.由于您绑定了泛型集合，它会失败，因为 XamlWriter 无法序列化泛型.

XamlWriter (which I assume you're using) cannot serialise bindings, meaning that it will attempt to serialise the actual values bound instead. Since you have a generic collection bound, it fails because XamlWriter cannot serialise generics.

您有两个选择:告诉 XamlWriter 您不想序列化该属性:

You have two options: Tell XamlWriter that you don't want to serialise the property:

[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public ObservableCollection<string> ComboItemsProperty
{
    get { return ComboItemsField; }
    set { ComboItemsField = value; }
}

或者如果您确实需要绑定项目，那么通过创建您自己的从泛型派生的具体类来消除泛型问题.有关详细信息，请参阅此问题.

or if you do require the items to be bound, then remove the generics problem by creating your own concrete class that derives from the generic. See this question for details.

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