如何在 c# 代码中构建 DataTemplate?
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How do I build a DataTemplate in c# code?
提问by
I am trying to build a dropdown list for a winform interop, and I am creating the dropdown in code. However, I have a problem getting the data to bind based on the DataTemplate I specify.
我正在尝试为 winform 互操作构建下拉列表,并且我正在代码中创建下拉列表。但是,我在根据我指定的 DataTemplate 获取要绑定的数据时遇到问题。
What am I missing?
我错过了什么?
drpCreditCardNumberWpf = new ComboBox();
DataTemplate cardLayout = new DataTemplate {DataType = typeof (CreditCardPayment)};
StackPanel sp = new StackPanel
{
Orientation = System.Windows.Controls.Orientation.Vertical
};
TextBlock cardHolder = new TextBlock {ToolTip = "Card Holder Name"};
cardHolder.SetBinding(TextBlock.TextProperty, "BillToName");
sp.Children.Add(cardHolder);
TextBlock cardNumber = new TextBlock {ToolTip = "Credit Card Number"};
cardNumber.SetBinding(TextBlock.TextProperty, "SafeNumber");
sp.Children.Add(cardNumber);
TextBlock notes = new TextBlock {ToolTip = "Notes"};
notes.SetBinding(TextBlock.TextProperty, "Notes");
sp.Children.Add(notes);
cardLayout.Resources.Add(sp, null);
drpCreditCardNumberWpf.ItemTemplate = cardLayout;
采纳答案by Donnelle
Assuming that you've already set up the ItemsSource
etc for drpCreditCardNumberWpf
...
假设您已经ItemsSource
为drpCreditCardNumberWpf
...
//create the data template
DataTemplate cardLayout = new DataTemplate();
cardLayout.DataType = typeof(CreditCardPayment);
//set up the stack panel
FrameworkElementFactory spFactory = new FrameworkElementFactory(typeof(StackPanel));
spFactory.Name = "myComboFactory";
spFactory.SetValue(StackPanel.OrientationProperty, Orientation.Horizontal);
//set up the card holder textblock
FrameworkElementFactory cardHolder = new FrameworkElementFactory(typeof(TextBlock));
cardHolder.SetBinding(TextBlock.TextProperty, new Binding("BillToName"));
cardHolder.SetValue(TextBlock.ToolTipProperty, "Card Holder Name");
spFactory.AppendChild(cardHolder);
//set up the card number textblock
FrameworkElementFactory cardNumber = new FrameworkElementFactory(typeof(TextBlock));
cardNumber.SetBinding(TextBlock.TextProperty, new Binding("SafeNumber"));
cardNumber.SetValue(TextBlock.ToolTipProperty, "Credit Card Number");
spFactory.AppendChild(cardNumber);
//set up the notes textblock
FrameworkElementFactory notes = new FrameworkElementFactory(typeof(TextBlock));
notes.SetBinding(TextBlock.TextProperty, new Binding("Notes"));
notes.SetValue(TextBlock.ToolTipProperty, "Notes");
spFactory.AppendChild(notes);
//set the visual tree of the data template
cardLayout.VisualTree = spFactory;
//set the item template to be our shiny new data template
drpCreditCardNumberWpf.ItemTemplate = cardLayout;
You can use the same way I have set the ToolTip
on the TextBlock
s to set other properties such as margins.
您可以使用我ToolTip
在TextBlock
s 上设置的相同方式来设置其他属性,例如边距。
回答by a_a
Well, indeed we still have another way, you will really like it if you dislike those FrameworkElementFactory
things.
嗯,确实我们还有另外一种方式,如果你不喜欢那些FrameworkElementFactory
东西,你会真的喜欢它。
And I think it just makes minor changes to the natural code, that is, declare a UserControl
and put your control into it, and then, use just one FrameworkElementFactory
to call the UserControl
.
而且我认为它只是对自然代码进行了微小的更改,即声明 aUserControl
并将您的控制权放入其中,然后仅使用一个FrameworkElementFactory
来调用UserControl
.
Simple demo code (in F#):
简单的演示代码(在 F# 中):
let buildView()=StackPanel()
//Build it with natural code
type MyView()=inherit UserControl(Content=buildView())
let factory=FrameworkElementFactory(typeof<MyView>)
let template=DataTemplate(VisualTree=factory)
let list=ItemsControl(ItemsSource=makeData(),ItemTemplate=template)
回答by Pavlo Datsiuk
The full version
完整版
var ms = new MemoryStream(Encoding.UTF8.GetBytes(@"<DataTemplate xmlns=""http://schemas.microsoft.com/winfx/2006/xaml/presentation""
xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml""
xmlns:c=""clr-namespace:MyApp.Converters;assembly=MyApp"">
<DataTemplate.Resources>
<c:MyConverter x:Key=""MyConverter""/>
</DataTemplate.Resources>
<TextBlock Text=""{Binding ., Converter={StaticResource MyConverter}}""/>
</DataTemplate>"));
var template = (DataTemplate)XamlReader.Load(ms);
var cb = new ComboBox { };
//Set the data template
cb.ItemTemplate = template;