TextBlock绑定属性
绑定单个属性及转换器
<UserControl.Resources>
<cvt:StateConv x:Key="stateConv"/>
</UserControl.Resources>
...
<TextBlock Text="{Binding Name, StringFormat={}{0:F2}, Converter="{StaticResource stateConv}"}"/>
using System;
using System.Globalization;
using System.Windows.Data;
public class StateConv: IValueConverter
{
// 此文本将显示在控件中（比如：TextBox）
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
int type = 0;
string rslt = string.Empty;
if (int.TryParse(value.ToString(), out type))
{
if (type == 1) { rslt = "正常"; }
else { rslt = "异常"; }
}
return rslt;
}
// 目标数据格式转换为原数据格式（正常->1）
// 当您更改控件TextBox的值时，ConvertBack方法将在绑定再次触发时调用(默认OnFocusLost)
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
if (string.IsNullOrEmpty(value?.ToString()))
return -1;
var item = TypeResource.FirstOrDefault(x => x.DisplayText == value.ToString());
if (item == null)
{
return -1;
}
return item.Key;
}
}
转换器2
数值转换，显示指定枚举类型的文本描述
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value != null && int.TryParse(value.ToString(), out int type))
{
if (Enum.IsDefined(typeof(PropertyNameEnumType), type))
{
var @enum = (PropertyNameEnumType)type;
return @enum.GetEnumDescription();
}
}
return "未知状态";
}
多重绑定1
<Label.Content>
<TextBlock>
<TextBlock.Text>
<MultiBinding StringFormat="{}{0}({1})">
<Binding Path="Name1" TargetNullValue="用默认值来显示为空的字段" />
<Binding Path="Name2" />
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</Label.Content>
StringFormat要求它的目标是string类型。 可在指定控件内嵌套TextBlock进行自定义格式转换。
若要体现动态数据，属性所属类需要实现INotificationPropertyChanged接口，绑定的属性可以响应属性更改事件。
多重绑定2
<UserControl.Resources>
<cvt:MultiStateConv x:Key="multiStateConverter"/>
<cvt:MultiVersionTypeConv x:Key="multiVersionTypeConverter"/>
</UserControl.Resources>
...
<TextBlock>
<TextBlock.Content>
<MultiBinding Converter="{StaticResource multiStateConverter}">
<Binding Path="Name"/>
<Binding Path="Name2"/>
</MultiBinding>
</TextBlock.Content>
</TextBlock>
<DataGridTextColumn Header="版本类型" Width="*">
<DataGridTextColumn.Binding>
<MultiBinding Converter="{StaticResource multiVersionTypeConverter}" ConverterParameter="{StaticResource multiStateConverter}">
<Binding Path="Type1"/>
<Binding Path="Type2"/>
</MultiBinding>
</DataGridTextColumn.Binding>
</DataGridTextColumn>
using System;
using System.Globalization;
using System.Windows.Data;
[ValueConversion(typeof(object[]), typeof(string))]
class MultiStateConv : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
var cvt = parameter as MultiStateConv;
string rslt = string.Empty;
if (int.TryParse(values[0].ToString(), out int type))
{
//...
}
if (int.TryParse(values[1].ToString(), out int type2))
{
//...
}
return rslt;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
可直接调用资源词典
Converter.xaml
{Binding Converter={StaticResource Boolean2VisibilityConverter}}
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:converter="clr-namespace:XXX.Converters">
<BooleanToVisibilityConverter x:Key="Boolean2VisibilityConverter"/>
......
</ResourceDictionary>
DataGrid中，编辑状态下触发事件
<DataGridTextColumn Width="auto" IsReadOnly="False" MinWidth="110" Binding="{Binding Name}" Header="名称">
<DataGridTextColumn.EditingElementStyle>
<Style TargetType="TextBox">
<EventSetter Event="TextChanged" Handler="DataGridTextColumn_Name_TextChanged"/>
<EventSetter Event="LostFocus" Handler="DataGridTextColumn_Name_LostFocus"/>
</Style>
</DataGridTextColumn.EditingElementStyle>
</DataGridTextColumn>
RadioButton绑定属性
<UserControl.Resources>
<cvt:RadioCheckConv x:Key="radioCheckConverter"/>
</UserControl.Resources>
<RadioButton Content="XXX" HorizontalAlignment="Center" GroupName="GroupName1"
IsChecked="{Binding PropertyName1, Converter={StaticResource radioCheckConverter}, ConverterParameter=1}"/>
其中，属性PropertyName1是可通知的；
using System;
using System.Windows.Data;
public class RadioCheckConv : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null || parameter == null)
{
return false;
}
if (value.ToString().Equals(parameter.ToString()))
{
return true;
}
return false;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null || parameter == null)
{
return null;
}
if ((bool)value)
{
return parameter.ToString();
}
return null;
}
}
TextBox绑定属性
<TextBox x:name="txt" Text="{Binding PropertName, Mode=TwoWay, UpdateSourceTrigger=Default}" />
控件绑定属性时，UpdateSourceTrigger默认为Default。源PropertName不会随着Text属性的改变而立即更新；TextBox中的变化并不是立即传递到源，而是在TextBox失去焦点后，源才更新。
| UpdateSourceTrigger枚举 | 说明 | 备注 |
|---|---|---|
| Default | 默认值 | 默认为LostFocuse |
| Explicit | 当应用程序调用 UpdateSource 方法时生效 | 通过代码手动推送来更新 |
| LostFocus | 失去焦点的时候触发 | |
| PropertyChanged | 属性改变的时候触发 | 源会立即更新 |
using System.Windows.Data;
private void btnUpdateSource_Click(object sender, RoutedEventArgs e)
{
// Explicit时，手动更新绑定的属性
BindingExpression binding = txt.GetBindingExpression(TextBox.TextProperty);
binding.UpdateSource();
}
后台绑定
<cvt:IntToBoolConv x:Key="intToBoolConverter"/>
<CheckBox Content="启用" x:Name="CheckBox1"
IsChecked="{Binding IsEnable, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, Converter={StaticResource intToBoolConverter}}" />
this.DataContext = this; // Prism可省略此步；此时IsEnable可通知客户端即可，不要求是依赖属性propdp
相当于后台实现
<CheckBox Content="启用" x:Name="CheckBox1" />
using System.Windows.Data;
BindingOperations.SetBinding(CheckBox1, // 控件名称
CheckBox.IsCheckedProperty, // 控件属性
new Binding // 绑定内容
{
Path = new PropertyPath("IsEnable"), // 依赖属性 IsEnable
Mode = BindingMode.TwoWay,
UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
Converter = new IntToBoolConv(),
Source = this, // 属性所属对象
});