我有一个Silverlight应用程序,我在其中使用RadDataFilter。此RadDataFilter使用自定义对象列表作为testComboBox的数据源。当用户单击“测试”按钮时,过滤器值始终设置为“未设置”。例如,如果我使用下面的代码,我总是看到“Priority IsEqualTo”。但是,如果我使用一个字符串值列表作为testComboBox的数据源,一切正常。这是我的代码:
<UserControl.Resources>
<DataTemplate x:Key="priorityTemplate">
<telerik:RadComboBox x:Name="testComboBox" MinWidth="100" DisplayMemberPath="Title" SelectedValue="{Binding Path=Value, Mode=TwoWay, FallbackValue=null}" SelectionChanged="testComboBox_SelectionChanged">
<telerik:RadComboBox.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel MinWidth="320" />
</ItemsPanelTemplate>
</telerik:RadComboBox.ItemsPanel>
</telerik:RadComboBox>
</DataTemplate>
<DataTemplate x:Key="locationTemplate"></DataTemplate>
<DataTemplate x:Key="typeTemplate"></DataTemplate>
<code:MyEditorTemplateSelector x:Key="myEditorTemplate">
<code:MyEditorTemplateSelector.EditorTemplateRules>
<code:MyEditorTemplateRule PropertyName="Priority" DataTemplate="{StaticResource priorityTemplate}" />
<code:MyEditorTemplateRule PropertyName="Location" DataTemplate="{StaticResource locationTemplate}" />
<code:MyEditorTemplateRule PropertyName="TypeName" DataTemplate="{StaticResource typeTemplate}" />
</code:MyEditorTemplateSelector.EditorTemplateRules>
</code:MyEditorTemplateSelector>
</UserControl.Resources>
<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition />
</Grid.RowDefinitions>
<Button Content="Test" Height="30" Width="90" Margin="0,0,0,8" HorizontalAlignment="Left" Click="Button_Click" />
<telerik:RadDataFilter x:Name="filter" Grid.Row="1" EditorCreated="filter_EditorCreated" AutoGenerateItemPropertyDefinitions="False" EditorTemplateSelector="{StaticResource myEditorTemplate}" Loaded="filter_Loaded" />
</Grid>
以下是我的代码隐藏的相关部分:
private void filter_Loaded(object sender, RoutedEventArgs e)
{
ItemPropertyDefinition priorityDefinition = new ItemPropertyDefinition("Priority", typeof(string), "Priority");
filter.ItemPropertyDefinitions.Add(priorityDefinition);
}
private void Button_Click(object sender, RoutedEventArgs e)
{
string rules = string.Empty;
foreach (FilterDescriptor description in filter.FilterDescriptors)
rules += description.ToString() + "\n";
MessageBox.Show(rules);
}
private void filter_EditorCreated(object sender, EditorCreatedEventArgs e)
{
switch (e.ItemPropertyDefinition.PropertyName)
{
case "Priority":
// This works
List<string> options = new List<string>() { "High", "Low" };
//(RadComboBox)(e.Editor)).ItemsSource = options;
// This doesn't
List<Priority> priorities = new List<Priority>();
priorities.Add(new Priority("High", true));
priorities.Add(new Priority("Low", false));
((RadComboBox)(e.Editor)).ItemsSource = priorities;
break;
}
}
以下是Priority.cs的定义:
public class Priority
{
public string Title { get; set; }
public bool Val { get; set; }
public Priority(string title, bool val)
{
this.Title = title;
this.Val = val;
}
}
最后,这是模板选择器代码:
public class MyEditorTemplateSelector : DataTemplateSelector
{
private List<MyEditorTemplateRule> templateRules = new List<MyEditorTemplateRule>();
public List<MyEditorTemplateRule> EditorTemplateRules
{
get { return templateRules; }
}
public override DataTemplate SelectTemplate(object item, DependencyObject container)
{
ItemPropertyDefinition propertyDefinition = (ItemPropertyDefinition)item;
foreach (MyEditorTemplateRule rule in templateRules)
{
// Select the appropriate template for each property.
if (rule.PropertyName == propertyDefinition.PropertyName)
{
return rule.DataTemplate;
}
}
return base.SelectTemplate(item, container);
}
}
public class MyEditorTemplateRule
{
private string propertyName;
public string PropertyName
{
get
{
return this.propertyName;
}
set
{
this.propertyName = value;
}
}
private DataTemplate dataTemplate;
public DataTemplate DataTemplate
{
get
{
return this.dataTemplate;
}
set
{
this.dataTemplate = value;
}
}
}
如何在编辑器模板中为过滤器选项使用自定义类型?
谢谢!
答案 0 :(得分:1)
实际上,我认为当你使用字符串列表时,你会使用以下代码:
<telerik:RadComboBox x:Name="testComboBox" MinWidth="100" DisplayMemberPath="Title"
SelectedValue="{Binding Path=Value, Mode=TwoWay, FallbackValue=null}"
SelectionChanged="testComboBox_SelectionChanged">
但是,当您更改DataSource
时,您使用的是对象集合,那么您可能会更改DisplayMemberPath
和SelectedValue
。
对于DadDataFilter
,您不应该更改
selectValue={Binding Path=Value, Mode=TwoWay, FallbackValue=null};
此处path=Value
必须与所有绑定相同。
尝试使用以下内容:
<telerik:RadComboBox x:Name="testComboBox" MinWidth="100" DisplayMemberPath="Title"
SelectedValue="{Binding Value, Mode=TwoWay, FallbackValue=null}"
SelectionChanged="testComboBox_SelectionChanged">
答案 1 :(得分:0)
我在WPF中遇到了完全相同的问题,在google搜索我最终想出的解决方案时发现了你的问题:
您将ItemPropertyDefinition
的属性类型设置为字符串,但在RadComboBox
的{{1}}的绑定中,绑定对象值的类型为“优先级”。因此,解决方案是在绑定中使用SelectedValue
对象,Converter
类必须实现Converter
。
IValueConverter
这是我的xaml:
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Data;
using QUPS.Data;
using QUPS.Data.QUPSModel;
namespace QUPS.Helpers
{
public class EntityObjectToDecimalConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter,
CultureInfo culture)
{
if (value is IQUPSEntityObject)
{
var rec = (IQUPSEntityObject)value;
return rec.ID;
}
return value;
}
public object ConvertBack(object value, Type targetType, object parameter,
CultureInfo culture)
{
if (value is IQUPSEntityObject)
{
var rec = (IQUPSEntityObject)value;
return rec.ID;
}
return value;
}
}
}