试图setter的值绑定时出错 [英] Error when trying to bind the value of a setter

问题描述

我有以下XAML：

 ＆LT; ListBox.ItemsPanel＆GT;
                    ＆LT; ItemsPanelTemplate＆GT;
                        ＆LT;网格和GT;
                            ＆LT; Grid.RowDefinitions＆GT;
                                ...
                            ＆LT; /Grid.RowDefinitions>
                            ＆LT; Grid.ColumnDefinitions＆GT;
                                ...
                            ＆LT; /Grid.ColumnDefinitions>
                        ＆LT; /网格和GT;
                    ＆LT; / ItemsPanelTemplate＆GT;
                ＆LT; /ListBox.ItemsPanel>
                ...
                ＆LT; ListBox.ItemContainerStyle＆GT;
                    ＆LT;风格的TargetType =ListBoxItem的＆GT;
                        ＆LT; setter属性=Grid.RowVALUE ={结合行，模式=单向}/＆GT;
                        ＆LT; setter属性=Grid.ColumnVALUE ={绑定列，模式=单向}/＆GT;
                    ＆LT; /样式和GT;
                ＆LT; /ListBox.ItemContainerStyle>
                ...
 

在页面加载后，我得到了如下的 XamlParseException ：

  

无法分配到财产System.Windows.Setter.Value。 [行：69职位：63]

  
  

    

的InnerException：结果
    NotSupportedException异常：无法设置只读属性

。
  

在错误的行号对应 Grid.Row 制定者;如果我把一个硬codeD值，而不是具有约束力的，它工作正常（但显然这不是我想要的）。

这是怎么回事？内部异常消息是没有意义的;我没有设置任何只读属性，我当然不会设置属性没有名字！

我是新来的Windows Phone，但我pretty一致的肯定code会很好地工作在WPF ......在二传手是绑定不支持WP？

解决方案

您的怀疑似乎是正确的 - 根据<一个href=\"http://blogs.msdn.com/b/delay/archive/2009/05/07/one-more-platform-difference-more-or-less-tamed-settervaluebindinghelper-makes-silverlight-setters-better.aspx?Redirected=true\"相对=nofollow>这篇文章，WP不支持在二传手的值绑定。

也有文章中给出解决办法，<一个href=\"http://blogs.msdn.com/b/delay/archive/2009/11/02/as-the-platform-evolves-so-do-the-workarounds-better-settervaluebindinghelper-makes-silverlight-setters-better-er.aspx?Redirected=true\"相对=nofollow>同时也出现了一个更新和<一个href=\"http://blogs.msdn.com/b/delay/archive/2010/11/10/the-taming-of-the-phone-new-settervaluebindinghelper-sample-demonstrates-its-usefulness-on-windows-phone-7-and-silverlight-4.aspx\"相对=nofollow>另一篇文章。说实话 - 我还没有与这些例子出场，但也许他们会帮助你以某种方式

I have the following XAML:

                <ListBox.ItemsPanel>
                    <ItemsPanelTemplate>
                        <Grid>
                            <Grid.RowDefinitions>
                                ...
                            </Grid.RowDefinitions>
                            <Grid.ColumnDefinitions>
                                ...
                            </Grid.ColumnDefinitions>
                        </Grid>
                    </ItemsPanelTemplate>
                </ListBox.ItemsPanel>
                ...
                <ListBox.ItemContainerStyle>
                    <Style TargetType="ListBoxItem">
                        <Setter Property="Grid.Row" Value="{Binding Row, Mode=OneWay}" />
                        <Setter Property="Grid.Column" Value="{Binding Column, Mode=OneWay}" />
                    </Style>
                </ListBox.ItemContainerStyle>
                ...

When the page loads, I'm getting the following XamlParseException:

Failed to assign to property 'System.Windows.Setter.Value'. [Line: 69 Position: 63]

InnerException:
NotSupportedException: Cannot set read-only property ''.

The line number in the error corresponds to the Grid.Row setter; if I put a hard-coded value instead of a binding, it works fine (but obviously it's not what I want).

What's going on? The inner exception message makes no sense; I'm not setting any read-only property, and I'm certainly not setting a property with no name!

I'm new to Windows Phone, but I'm pretty sure the same code would work fine in WPF... Is binding in a setter not supported on WP?

解决方案

Your suspicions seem to be right - according to this article, WP doesn't support Binding in the Value of a Setter.

There is also a workaround given in the article, there has also been an update and another article. To be honest - I haven't played with those examples, but maybe they will help you somehow.

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