我在 Silverlight 4 中创建动态控件时遇到问题。
我的要求是：
我在数据库中有问题表，如下所示。
QuestionText、AnswerControl、AnswerDefaultText、IsItmandatory
Question1 TextBox null 是
QuestionText2，单选按钮，是的，是的
问题3，组合框，空，否
………………………………………………………………………………………………………………………………………………
我需要将这些数据转换为对象并将问题文本转换为 TextBlock，并根据 answercontrol 值，需要动态创建控件。
正如您在帖子中提到的那样，我尝试过，但是数据没有绑定，并且无法将默认值作为参数值发送给转换器。
我的转换器没有被调用。下面的代码有什么问题吗？
我的代码是：
1）我的 Xaml 代码：
<UserControl x:Class="SilverlightApplication5.DynamicControls"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:SilverlightApplication5.Converter"
xmlns:question="clr-namespace:SilverlightApplication5"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400">
<Grid x:Name="LayoutRoot" Background="White" Width="400" Height="400">
<Grid.Resources>
<local:UILocatorConverter x:Key="UILocatorConverter" />
<question:Questions x:Key="Questions"/>
</Grid.Resources>
<ListBox ItemsSource="{Binding Questions}" Width="400" Height="400">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
</Grid.ColumnDefinitions>
<ContentControl Content="{Binding Converter={StaticResource UILocatorConverter},ConverterParameter={Binding QuestionText},Path=QuestionControl}" Grid.Column="0" />
<ContentControl Content="{Binding Converter={StaticResource UILocatorConverter},ConverterParameter={Binding DefaultValue},Path=AnswerControl}" Grid.Column="1" />
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</UserControl>
2）文件代码后面的代码是：
namespace SilverlightApplication5
{
public partial class DynamicControls : UserControl
{
ObservableCollection<Questions> Question;
public DynamicControls()
{
InitializeComponent();
Question = new ObservableCollection<Questions>();
Question.Add(new Questions { QuestionControl = "TextBlock", QuestionText = "What is your name?", AnswerControl = "TextBox", AnswerValues = "", DefaultValue = "" });
Question.Add(new Questions { QuestionControl = "TextBlock", QuestionText = "What is your surname?", AnswerControl = "TextBox", AnswerValues = "", DefaultValue = "" });
Question.Add(new Questions { QuestionControl = "TextBlock", QuestionText = "Sex:", AnswerControl = "ComboBox", AnswerValues = "Male,Female,Others", DefaultValue = "Select a Value" });
Question.Add(new Questions { QuestionControl = "TextBlock", QuestionText = "Marital Status", AnswerControl = "RadioButton", AnswerValues = "", DefaultValue = "Not Married" });
this.DataContext = Question;
}
}
}
3）我的转换器是：
namespace SilverlightApplication5.Converter
{
public class UILocatorConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
String param="This is control created dynamically";
if (parameter != null)
{
param = System.Convert.ToString(parameter);
}
switch (value.ToString())
{
case "TextBlock":
return new TextBlock() { Text = param, HorizontalAlignment=HorizontalAlignment.Center,TextWrapping=TextWrapping.NoWrap,Width=200 };
case "Button":
return new Button() { Content = param, Width=150 };
case "TextBox":
return new TextBox() { Text = param };
case "RadioButton":
return new TextBox() { };
case "ComboBox":
return new TextBox() { };
}
return null;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
4）我的问题类是：
namespace SilverlightApplication5
{
public class Questions
{
private string _questionControl;
public string QuestionControl {
get
{
return _questionControl;
}
set
{
_questionControl = value;
}
}
private string _questionText;
public string QuestionText
{
get
{
return _questionText;
}
set
{
_questionText = value;
}
}
private string _answerControl;
public string AnswerControl
{
get
{
return _answerControl;
}
set
{
_answerControl = value;
}
}
private string _answerValues;
public string AnswerValues
{
get
{
return _answerValues;
}
set
{
_answerValues = value;
}
}
private string _defaultValue;
public string DefaultValue
{
get
{
return _defaultValue;
}
set
{
_defaultValue = value;
}
}
}
}
我的转换器没有被调用，这段代码有什么问题吗？