如何在 c # 代码中构建 DataTemplate？

我正在尝试建立一个 winform 互操作下拉列表，我正在创建下拉代码。但是，我在根据我指定的 DataTemplate 绑定数据时遇到了问题。

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;
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最佳答案

Assuming that you've already set up the ItemsSource etc for 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 TextBlocks to set other properties such as margins.

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Well, indeed we still have another way, you will really like it if you dislike those FrameworkElementFactory things.

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.

Simple demo code (in F#):

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)
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The full version

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;

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