命名并声明在运行时使用 C# XamlReader 创建的按钮的事件处理程序 [英] Give a name and declare event handler of a button Created at run time with C# XamlReader

问题描述

我正在使用 C# 和 WPF 开发一个项目，该项目动态创建包含一些文本、图像和按钮的网格布局.我创建了许多这样的网格，并将它们添加到堆栈面板中.我使用 XamlReader.Create() 函数创建了这个网格.这是整个代码，我很抱歉 Xaml 代码太长

I am working on a project in C# and WPF that dynamically creates a grid layout that has some text, an image, and a button. I create many of these grids, and add them to a stack panel. I create this grid using the XamlReader.Create() function. Here is the whole code, and i apologize that the Xaml code is so long

string xaml = "<Grid Height='92' Margin='0,10,0,0' xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'>"+
            "<Grid.Background>"+
                "<LinearGradientBrush EndPoint='0.5,1' StartPoint='0.5,0'>"+
                    "<GradientStop Color='#FFACD7FF' Offset='0.172'/>"+
                    "<GradientStop Color='#FFACD7FF' Offset='0.508'/>"+
                    "<GradientStop Color='#FF69B5FF' Offset='0.996'/>"+
                    "<GradientStop Color='#FF79BEFB' Offset='0.017'/>"+
                    "<GradientStop Color='#FFACD7FF' Offset='0.877'/>"+
                "</LinearGradientBrush>"+
            "</Grid.Background>"+
            "<Grid.RowDefinitions>"+
                "<RowDefinition Height='0.522*'/>"+
                "<RowDefinition Height='0.478*'/>"+
            "</Grid.RowDefinitions>"+
            "<Grid.ColumnDefinitions>"+
                "<ColumnDefinition Width='133'/>"+
                "<ColumnDefinition Width='73.5'/>"+
                "<ColumnDefinition Width='0.833*'/>"+
                "<ColumnDefinition Width='0.167*'/>"+
                "<ColumnDefinition Width='108.775'/>"+
            "</Grid.ColumnDefinitions>"+
            "<Image Source='stockHome.jpg' Margin='8' Grid.Column='4' Grid.RowSpan='2'/>"+
            "<TextBlock TextWrapping='Wrap' Text='Details: "+
            addHouse.description+
            "' Margin='8' Grid.Column='2' HorizontalAlignment='Center'/>"+
            "<Button Content='View Full Description' Grid.Column='2' HorizontalAlignment='Center' Margin='4,8,0,8' Grid.Row='1' Width='134.667'/>"+
            "<Label Content='$"+
            addHouse.cost+
            "' Margin='8,8,0,0' FontSize='21.333' FontFamily='Segoe UI Semibold' HorizontalAlignment='Left' RenderTransformOrigin='0.53,1.474'/>"+
            "<Label Content='"+
            addHouse.neighborhood+
            "' Margin='8,0,0,8' Grid.Row='1' HorizontalAlignment='Left' Width='117' FontSize='18.667'/>"+
            "<TextBlock Grid.Column='1' Margin='8,15,8,8' Grid.RowSpan='2' TextWrapping='Wrap'><Run Text='"+
            addHouse.type+
            "'/><LineBreak/><Run Text='"+
            addHouse.bedrooms+
            " Bed'/><LineBreak/><Run Text='"+
            addHouse.bathrooms+
            " Bath'/><LineBreak/><Run Text='ID: "+
            addHouse.ID+
            "'/></TextBlock>"+
            "<Image Grid.Column='3' Margin='8,23.667,8,20.251' Grid.RowSpan='2' Source='HeartPop.png'/>"+
            "</Grid>";  


            // Load the panel
        StringReader stringReader = new StringReader(xaml);
        XmlReader xmlReader = XmlReader.Create(stringReader);
        Grid readerLoadGrid = (Grid)XamlReader.Load(xmlReader);

这对我来说效果很好，我认为这将是在运行时生成网格布局的正确方法，但是现在我需要命名按钮并定义一个事件处理程序，这会崩溃.当我尝试将按钮描述更改为

This has worked fine for me, and i thought this would be the correct way to generate a grid layout at runtime, but now that i need to name the button, and define an event handler, this falls apart. when i try to change the button description to

 <Button x:Name = 'houseButton' Click = 'descriptionButtonClick' ...

我收到 XAMLParse 异常.读完之后，我不太确定您是否可以在运行时在 xaml 中声明这些东西.所以现在，我对如何做到这一点感到非常困惑.我不能在创建网格后更改名称，因为它没有名称可供调用.有没有办法访问 UIElement 的子元素，即使它没有名字?或者有没有办法在运行时在 XAML 中声明名称而我只是做错了?

I get a XAMLParse exception. After reading about this, i am not so sure that you can declare these things in xaml at runtime. So now, I am very confused on how else to do this. I cant just change the name after i have created the grid, as it has no name to be called by. is there a way to access a child of a UIElement even if it has no name? or is there a way to declare the name in XAML at runtime and im just doing it wrong?

推荐答案

您可以像使用大多数其他控件一样在运行时定义网格.这是一个显示示例的页面:

You can define the Grid on runtime like you can do it with most other controls. here is a page showing an example how:

http://sullivan.net/blog/2009/09/creating-a-wpf-grid-programmatically-code-behind/

您将能够使用按钮对象并使用 c# 访问它们，例如:

than you'll be able to use button objects and access them using c# like:

按钮 myBtn = new Button();Button.Click += new ....

Button myBtn = new Button(); Button.Click += new ....

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