数据绑定 TextBlock.Inlines
我的 WPF 应用程序从后端服务接收消息流,我需要将其显示在 UI 中。这些消息差异很大,我希望每条消息都有不同的视觉布局(字符串格式、颜色、字体、图标等)。
我希望能够为每条消息创建一个内联(Run、TextBlock、Italic 等),然后以某种方式将它们全部放入 ObservableCollection<> 中,并在我的设备上使用 WPF 数据绑定的魔力。 UI 中的 TextBlock.Inlines。我找不到如何做到这一点,这可能吗?
My WPF App receives a stream of messages from a backend service that I need to display in the UI. These messages vary widely and I want to have different visual layout (string formats, colors, Fonts, icons, whatever etc.) for each message.
I was hoping to just be able to create an inline (Run, TextBlock, Italic etc) for each message then somehow put them all in a ObservableCollection<>
and using he magic of WPF Data Binding on my TextBlock.Inlines in the UI. I couldn't find how to do this, is this possible?
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您可以将依赖属性添加到 TextBlock 子类
You could add a Dependency Property to a TextBlock Subclass
这是不可能的,因为
TextBlock.Inlines
属性不是依赖属性。只有依赖属性才能成为数据绑定的目标。根据您的具体布局要求,您可以使用
ItemsControl
来完成此操作,将其ItemsPanel
设置为WrapPanel
并将其ItemsSource
设置为您的集合。 (这里可能需要进行一些实验,因为Inline
不是UIElement
,因此它的默认渲染可能会使用ToString()
而不是)或者,您可能需要构建一个新控件,例如
MultipartTextBlock
,并使用可绑定的PartsSource
属性和TextBlock
作为其默认值模板。设置PartsSource
后,您的控件将附加一个CollectionChanged
事件处理程序(直接或通过 CollectionChangedEventManager),并从代码更新TextBlock.Inlines
集合随着PartsSource
集合的更改。无论哪种情况,如果您的代码直接生成
Inline
元素(因为Inline
不能同时在两个地方使用),则可能需要小心。或者,您可能需要考虑公开文本、字体等的抽象模型(即视图模型)并通过DataTemplate
创建实际的Inline
对象。这也可以提高可测试性,但显然会增加复杂性和工作量。This is not possible because the
TextBlock.Inlines
property is not a dependency property. Only dependency properties can be the target of a data binding.Depending on your exact layout requirements you may be able to do this using an
ItemsControl
, with itsItemsPanel
set to aWrapPanel
and itsItemsSource
set to your collection. (Some experimentation may be required here because anInline
is not aUIElement
, so its default rendering will probably be done usingToString()
rather than being displayed.)Alternatively, you may need to build a new control, e.g.
MultipartTextBlock
, with a bindablePartsSource
property and aTextBlock
as its default template. When thePartsSource
was set your control would attach aCollectionChanged
event handler (directly or via CollectionChangedEventManager), and update theTextBlock.Inlines
collection from code as thePartsSource
collection changed.In either case, caution may be required if your code is generating
Inline
elements directly (because anInline
can't be used in two places at the same time). You may alternatively want to consider exposing an abstract model of text, font, etc. (i.e. a view model) and creating the actualInline
objects via aDataTemplate
. This may also improve testability, but obviously adds complexity and effort.这是利用 WPF 行为/附加属性的替代解决方案:
在 XAML 中,按如下方式使用它:
这使您不必从 TextBlock 继承。它也可以使用 ObservableCollection 而不是 IEnumerable 来工作,在这种情况下,您需要订阅集合更改。
This is an alternative solution which utilizes WPF behaviors/attached properties:
In your XAML, use it like this:
This saves you from having to inherit from TextBlock. It could just as well work using an ObservableCollection instead of IEnumerable, in that case you'd need to subscribe to collection changes.
在 WPF 版本 4 中,您将能够绑定到 Run 对象,这可能会解决您的问题。
我过去通过重写 ItemsControl 并将文本显示为 ItemsControl 中的项目解决了这个问题。查看 WPF 博士针对此类内容所做的一些教程:http://www.drwpf.com
In version 4 of WPF you will be be able to bind to a Run object, which may solve your problem.
I have solved this problem in the past by overriding an ItemsControl and displaying the text as items in the ItemsControl. Look at some of the tutorials that Dr. WPF has done on this kind of stuff: http://www.drwpf.com
感谢弗兰克提供的解决方案。我必须做一些小的改变才能使它适合我。
Thanks Frank for your solution. I had to make a couple of minor changes to make it work for me.
如果我正确地得到您的要求,您可以手动检查即将到来的消息,并且对于每条消息,您可以向 TextBlock.Inlines 属性添加一个元素。它不需要任何数据绑定。
我已经通过以下方式完成了此操作:
If i am getting your requirement correctly, you can manually check for the coming messages and for each message you can add an element to TextBlock.Inlines property. It will not take any DataBinding.
I have done this with the following:
帕维尔·安希库斯基 (Pavel Anhikouski) 的建议非常有效。这里缺少 MVVM 中数据绑定的部分。使用视图模型中的 AddTrace 属性将内容添加到窗口中的 OutputBlock。
不需要窗口中的支持属性 MyBindingPath。
视图模型:
TraceWindow.xaml:
TraceWindow.xaml.cs:
The Suggestion from Pavel Anhikouski works perfectly. Here the missing part with databinding in MVVM. Use the AddTrace property in the viewmodel to add content to the OutputBlock in the window.
The backing property MyBindingPath in the window is not needed.
ViewModel:
TraceWindow.xaml:
TraceWindow.xaml.cs:
最近我有一个类似的任务需要解决,即;可以将无限数量的 url 链接插入到自定义消息框文本内容中,并且具有此文本的绑定路径。
我决定在这里发布我的实现,因为这个线程有一些不同伟大想法的演变...这是我的解决方案:
概念:
xaml TextBlock 内容的流程:
"...这里有一些文本...[链接-text|url-link]...此处还有一些其他文本...等。”
示例:
“请访问 Microsoft [site|https://www. microsoft.com/en-us/windows/windows-7-end-of-life-support-information],并下载 Windows 7 SP1,完成 SP1 安装,然后再次重新运行安装程序。 [roblox|https://www.roblox.com] 网站,像我儿子 \u263A 一样放松。”
xaml 部分:定义绑定路径 (MixedText)。
...
ViewModel 部分:定义绑定路径属性。
MultipartTextHandler 类,我在其中实现 MixedText 解析和动态 xaml 注入模型准备。
代码隐藏的东西。
在视图构造函数内部:
this.DataContextChanged += MessageBoxView_DataContextChanged;
MessageBoxView_DataContextChanged 实现。
来自我的控制台应用程序的用法。
实际的对话框显示视图:
Most recently I had a similar task to solve, namely; having unlimited number of url links inserted to a custom message box text content, and have a binding path to this text.
I decided to post my implementation here seeing that this thread had some evolution of different great ideas... Here is my solution:
The concept:
The flow of xaml TextBlock content:
"...some text here...[link-text|url-link]...some other text here... etc."
Sample:
"Please visit the Microsoft [site|https://www.microsoft.com/en-us/windows/windows-7-end-of-life-support-information], and download the Windows 7 SP1, complete the SP1 installation then re-run the installer again. Go to [roblox|https://www.roblox.com] site to relax a bit like my son \u263A."
The xaml part: Defining the binding path (MixedText).
...
The ViewModel part: Defining the binding path property.
The MultipartTextHandler class where I implement the MixedText parsing and dynamic xaml injection model preparation.
The Code-behind stuff.
Inside the view constructor:
this.DataContextChanged += MessageBoxView_DataContextChanged;
The MessageBoxView_DataContextChanged implementation.
The usage, from my console application.
The actual dialog display view:
我认为您可能需要在 PropertyChanged 处理程序上添加一些额外的代码,以便在绑定集合已包含内容时初始化 textBlock.Inlines,并清除任何现有上下文。
I think you may need some additional code on the PropertyChanged handler, so to initialise the textBlock.Inlines if the bound collection already has content, and to clear any existing context.
每个人都给出了很好的解决方案,但我遇到了类似的问题,在寻找解决方案后,我决定尝试直接绑定到默认内容。没有依赖属性。
抱歉,我的英语已经过时了...呵呵呵呵
好吧,让我们在您的 xaml 文件上使用它...
瞧!
这是因为它们绑定内联是不必要的,您可以修改另一个控件内容中的文本部分而无需绑定,这个解决方案对我有帮助。
Everyone given good solutions, but I had a similar problem and after hours looking for solutions I decide try directly bind to default content. Without Dependency Properties.
Sorry my obsolete english... hehehehe
Ok, lets use this on your xaml file...
And voila!
It's because they bind inlines is unnecessary, you can modify de parts of a text from another control contents without a binding, this solution help-me.