34
private
void
Add(AddObject addObject)
35
{
36
Result = addObject.ArgA +
addObject.ArgB;
37
}
准备一个数据传输类
1 public class AddObject
3 public double ArgA { get; set; }
5 public double ArgB { get; set; }
准备一个多值转换类
1 public class MultiBindingConverter : IMultiValueConverter
3 public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
5 var addObject = new AddObject();
6 var list = new List<double>();
7 for (int i = 0; i < values.Length; i++)
9 //如果返回失败，直接结束
10 var flag = double.TryParse(values[i].ToString(), out double m);
11 if (!flag)
12 {
13 return null;
14 }
15 list.Add(m);
16 }
18 addObject.ArgA = list[0];
19 addObject.ArgB = list[1];
20 return addObject;
21 }
23 public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
24 {
25 throw new NotImplementedException();
26 }
准备一个多值转换类 控制Button的是否可用
1 public class EnableConverter : IMultiValueConverter
3 public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
5 //输入值能否转换为数字
6 return values.All(v => double.TryParse(v.ToString(), out _));
9 public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
10 {
11 throw new NotImplementedException();
12 }
1 <Window
2 x:Class="WpfApp1.MainWindow"
3 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
4 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
5 xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
6 xmlns:local="clr-namespace:WpfApp1"
7 xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
8 Title="MainWindow"
9 Width="800"
10 Height="450"
11 FontSize="20"
12 mc:Ignorable="d">
13 <Window.Resources>
14 <local:MultiBindingConverter x:Key="converter" />
15 <local:EnableConverter x:Key="enableConverter" />
16 </Window.Resources>
17 <Window.DataContext>
18 <local:TestViewModel />
19 </Window.DataContext>
20 <Grid>
21 <StackPanel
22 Width="400"
23 HorizontalAlignment="Center"
24 VerticalAlignment="Center"
25 Orientation="Vertical">
26 <StackPanel Orientation="Horizontal">
27 <TextBlock Margin="5" Text="参数A" />
28 <TextBox
29 x:Name="argA"
30 MinWidth="100"
31 Margin="5"
32 Text="{Binding ArgA}" />
33 </StackPanel>
34 <StackPanel Orientation="Horizontal">
35 <TextBlock Margin="5" Text="参数B" />
36 <TextBox
37 x:Name="argB"
38 MinWidth="100"
39 Margin="5"
40 Text="{Binding ArgB}" />
41 </StackPanel>
42 <StackPanel Orientation="Horizontal">
43 <TextBlock Margin="5" Text="结果:" />
44 <TextBlock
45 MinWidth="100"
46 Margin="5"
47 Text="{Binding Result}" />
48 <Button
49 MinWidth="100"
50 Margin="5"
51 Command="{Binding AddCmd}"
52 Content="计算">
53 <Button.IsEnabled>
54 <MultiBinding Converter="{StaticResource enableConverter}">
55 <Binding ElementName="argA" Path="Text" />
56 <Binding ElementName="argB" Path="Text" />
57 </MultiBinding>
58 </Button.IsEnabled>
59 <Button.CommandParameter>
60 <MultiBinding Converter="{StaticResource converter}">
61 <Binding ElementName="argA" Path="Text" />
62 <Binding ElementName="argB" Path="Text" />
63 </MultiBinding>
64 </Button.CommandParameter>
65 </Button>
66 </StackPanel>
67 </StackPanel>
68 </Grid>
69 </Window>
这个是否可用，应该是配合数据校验来使用 比如IDataErrorInfos ValidationRule等。
