我尝试实现DataTrigger,根据视图中哪个切换按钮被切换来执行动态绑定。但在搜索问题后,WinRT中的DataTrigger?似乎在Windows通用应用程序中不可用,应改用VisualStateManager代替。
我的问题是,如何使用VisualStateManager实现与下面代码等效的内容?或者使用其他任何方法从View Model的代码后台设置动态绑定。
这是我原打算使用的XAML,直到遇到这个问题,其中默认绑定是
以下是一个精简版的虚拟机,显示正在绑定的属性:
(请注意,保留了HTML标签)
我的问题是,如何使用VisualStateManager实现与下面代码等效的内容?或者使用其他任何方法从View Model的代码后台设置动态绑定。
这是我原打算使用的XAML,直到遇到这个问题,其中默认绑定是
OrdinaryGradePointKV
,当切换按钮切换时,绑定会更改为HigherGradePointKV
:<ComboBox
Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="2"
Width="60"
HorizontalAlignment="Right"
DisplayMemberPath="Key">
<ComboBox.Style>
<Style>
<Setter Property="ComboBox.ItemsSource" Value="{Binding OrdinaryGradePointKV}"></Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding IsHigherToggled}" Value="True">
<Setter Property="ComboBox.ItemsSource"
Value="{Binding HigherGradePointKV}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ComboBox.Style>
</ComboBox>
以下是一个精简版的虚拟机,显示正在绑定的属性:
(请注意,保留了HTML标签)
namespace LC_Points.ViewModel
{
public class MainViewModel : ViewModelBase
{
/// <summary>
/// Initializes a new instance of the MainViewModel class.
/// </summary>
public MainViewModel()
{
//call methods to initialize list data
GetSubjectTypes();
GetOrdinaryGradePairs();
GetHigherGradePairs();
}
public List<Score> Subjects { get; set; }
public List<StringKeyValue> HigherGradePointKV { get; set; }
public List<StringKeyValue> OrdinaryGradePointKV { get; set; }
//ordinary toggle button bool
private bool _isOrdinaryToggled;
public bool IsOrdinaryToggled
{
get
{
return _isOrdinaryToggled;
}
set
{
_isOrdinaryToggled = value;
RaisePropertyChanged("IsOrdinaryToggled");
}
}
//Higher toggle button bool property
private bool _isHigherToggled;
public bool IsHigherToggled
{
get
{
return _isHigherToggled;
}
set
{
_isHigherToggled = value;
RaisePropertyChanged("IsHigherToggled");
}
}
public class StringKeyValue
{
public string Key { get; set; }
public int Value { get; set; }
}
public void GetOrdinaryGradePairs()
{
List<StringKeyValue> ordianryGradePointKVTemp = new List<StringKeyValue>();
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "A1", Value = 60 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "A2", Value = 50 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "B1", Value = 45 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "B2", Value = 40 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "B3", Value = 35 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "C1", Value = 30 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "C2", Value = 25 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "C3", Value = 20 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "D1", Value = 15 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "D2", Value = 10 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "D3", Value = 5 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "E,F,NG", Value = 0 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "Pass", Value = 30 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "Merit", Value = 50 });
ordianryGradePointKVTemp.Add(new StringKeyValue { Key = "Distinction", Value = 70 });
OrdinaryGradePointKV = ordianryGradePointKVTemp;
}
public void GetHigherGradePairs()
{
List<StringKeyValue> higherGradePointKVTemp = new List<StringKeyValue>();
higherGradePointKVTemp.Add(new StringKeyValue { Key = "A1", Value = 100 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "A2", Value = 90 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "B1", Value = 85 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "B2", Value = 80 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "B3", Value = 75 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "C1", Value = 70 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "C2", Value = 65 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "C3", Value = 60 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "D1", Value = 55 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "D2", Value = 50 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "D3", Value = 45 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "E,F,NG", Value = 0 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "Pass", Value = 30 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "Merit", Value = 50 });
higherGradePointKVTemp.Add(new StringKeyValue { Key = "Distinction", Value = 70 });
HigherGradePointKV = higherGradePointKVTemp;
}
public void GetSubjectTypes()
{
List<Score> subjectList = new List<Score>();
// Adding Subjects to List
subjectList.Add(new Score { Subject = "Biology" });
subjectList.Add(new Score { Subject = "Business" });
subjectList.Add(new Score { Subject = "Business Group" });
subjectList.Add(new Score { Subject = "Chemistry" });
subjectList.Add(new Score { Subject = "Classical Studies" });
Subjects = subjectList;
}
}
}