c# - 代码隐藏中带有转换器的 DataTemplate

Question

我正在尝试在代码隐藏中加载 DataTemplate，但如果我删除 Converter，它会正常工作...但是一旦我将其放入其中，它就会崩溃。现在，我确实设置了我的状态我的命名空间并将对我的转换器的引用放在 XAML 中。例如:

<Window.Resources>
     <local:StatCellConverter x:Key="myConverter" />
</Window.Resources>

这是我生成 DataTemplate 的方法:

private DataTemplate GenerateStatRowDataTemplate()
{
    ParserContext pc = new ParserContext();
    pc.XmlnsDictionary.Add("", "http://schemas.microsoft.com/winfx/2006/xaml/presentation");
    pc.XmlnsDictionary.Add("x", "http://schemas.microsoft.com/winfx/2006/xaml");
    pc.XmlnsDictionary.Add("xcdg", "http://schemas.xceed.com/wpf/xaml/datagrid");

    string statRowTemplate = "<DataTemplate><xcdg:StatRow>";
    statRowTemplate += "<xcdg:StatCell FieldName=\"Column4\" ResultPropertyName=\"AvgColumn4\">";
    statRowTemplate += "<xcdg:StatCell.ContentTemplate>";
    statRowTemplate += "<DataTemplate>";
    statRowTemplate += "<TextBlock Text=\"{Binding ., Converter={StaticResource ResourceKey=myConverter}}\" />";
    statRowTemplate += "</DataTemplate>";
    statRowTemplate += "</xcdg:StatCell.ContentTemplate>";
    statRowTemplate += "</xcdg:StatCell>";
    statRowTemplate += "</xcdg:StatRow>";
    statRowTemplate += "</DataTemplate>";

    StringReader stringReader = new StringReader(statRowTemplate);
    XmlReader xmlReader = XmlReader.Create(stringReader);
    MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(statRowTemplate.ToString()));
    DataTemplate dt = (DataTemplate)XamlReader.Load(ms,pc);
    dt.LoadContent();
    return dt;
}

我做错了什么？会不会我也必须在代码隐藏中定义我的转换器？

我的转换器

public class StatCellConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            Debug.WriteLine(value);

            if (value.Equals("#DIV/0#"))
                return "0";
            return value;
        }
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

我收到一个异常，说它无法加载 DataTemplate

Answer 1

这实际上是框架中的一个错误。 通过 XmlnsDictionary 添加本地命名空间是行不通的。 必须在定义了程序集和命名空间的模板定义中添加它:

如@Nerd In Training 上面的评论所述，这应该有效:

string statRowTemplate = "<DataTemplate >"; 

private DataTemplate GenerateStatRowDataTemplate()
{
    ParserContext pc = new ParserContext();
    pc.XmlnsDictionary.Add("", "http://schemas.microsoft.com/winfx/2006/xaml/presentation");
    pc.XmlnsDictionary.Add("x", "http://schemas.microsoft.com/winfx/2006/xaml");
    pc.XmlnsDictionary.Add("xcdg", "http://schemas.xceed.com/wpf/xaml/datagrid");

    string statRowTemplate = "<DataTemplate xmlns:local=\"clr-namespace:MyTest;assembly=MyTest\" ><xcdg:StatRow>";
    statRowTemplate += "<xcdg:StatCell FieldName=\"Column4\" ResultPropertyName=\"AvgColumn4\">";
    statRowTemplate += "<xcdg:StatCell.ContentTemplate>";
    statRowTemplate += "<DataTemplate>";
    statRowTemplate += "<TextBlock Text=\"{Binding ., Converter={StaticResource ResourceKey=myConverter}}\" />";
    statRowTemplate += "</DataTemplate>";
    statRowTemplate += "</xcdg:StatCell.ContentTemplate>";
    statRowTemplate += "</xcdg:StatCell>";
    statRowTemplate += "</xcdg:StatRow>";
    statRowTemplate += "</DataTemplate>";

    StringReader stringReader = new StringReader(statRowTemplate);
    XmlReader xmlReader = XmlReader.Create(stringReader);
    MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(statRowTemplate.ToString()));
    DataTemplate dt = (DataTemplate)XamlReader.Load(ms,pc);
    dt.LoadContent();
    return dt;
}