Question

我正在使用WPFLocalizationExtension（在CodePlex上可用）来本地化我的WPF应用程序中的字符串。这个简单的MarkupExtension在这样的简单场景中运行良好：

<Button Content="{lex:LocText MyApp:Resources:buttonTitle}" />

但是，一旦我尝试了一些更复杂的事情，我就会陷入困境：

<Window Title="{lex:LocText MyApp:Resources:windowTitle, FormatSegment1={Binding Version}}" />

（使用资源windowTitle = "MyApp v{0}"）。

由于FormatSegment1是一个简单的INotifyPropertyChange属性，我无法绑定任何内容。如果FormatSegment1是DependencyProperty，那么我可以下载源代码并尝试补丁。

我修改了

[MarkupExtensionReturnType(typeof(string))]
public class LocTextExtension : BaseLocalizeExtension<string>
{

    // ---- OLD property

    //public string FormatSegment1
    //{
    //    get { return this.formatSegments[0]; }
    //    set
    //    {
    //        this.formatSegments[0] = value;
    //        this.HandleNewValue();
    //    }
    //}

    // ---- NEW DependencyProperty

    /// <summary>
    /// The <see cref="FormatSegment1" /> dependency property's name.
    /// </summary>
    public const string FormatSegment1PropertyName = "FormatSegment1";

    /// <summary>
    /// Gets or sets the value of the <see cref="FormatSegment1" />
    /// property. This is a dependency property.
    /// </summary>
    public string FormatSegment1
    {
        get
        {
            return (string)GetValue(FormatSegment1Property);
        }
        set
        {
            SetValue(FormatSegment1Property, value);
        }
    }

    /// <summary>
    /// Identifies the <see cref="FormatSegment1" /> dependency property.
    /// </summary>
    public static readonly DependencyProperty FormatSegment1Property = DependencyProperty.Register(
        FormatSegment1PropertyName,
        typeof(string),
        typeof(LocTextExtension),
        new UIPropertyMetadata(null));

    // ...
}

BaseLocalizeExtension类继承自MarkupExtension：

public abstract class BaseLocalizeExtension<TValue> : MarkupExtension, IWeakEventListener, INotifyPropertyChanged

当我构建时，我得到通常的"GetValue/SetValue does not exist in current context"错误。我尝试让BaseLocalizeExtension类继承自DependencyObject，但我遇到了大量错误。

有没有办法在MarkupExtension中使用xaml可绑定的DependencyProperty（或者也可绑定的东西）？

谢谢你的提示

Answer 1

你可以选择附属物，这是你看到的唯一选择。

e.g。

public static readonly DependencyProperty FormatSegment1Property = DependencyProperty.RegisterAttached(
        "FormatSegment1", typeof(string), typeof(LocTextExtension), new PropertyMetadata(default(string)));

public static void SetFormatSegment1(DependencyObject element, string value)
{
    element.SetValue(FormatSegment1Property, value);
}

public static string GetFormatSegment1(DependencyObject element)
{
    return (string)element.GetValue(FormatSegment1Property);
}

<Window Title="{lex:LocText MyApp:Resources:windowTitle}" lex:LocText.FormatSegment1="{Binding Version}" />

MarkupExtension：将简单属性转换为DependencyProperty

1 个答案: