class NumMultiConvert : IMultiValueConverter { #region Field 字段 #endregion #region Constructor 构造函数 #endregion #region Property 属性 #endregion #region Event 事件 #endregion #region Method 方法 #endregion public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { return values.Where(i => i != null).Select(i => System.Convert.ToDouble(i)).Sum().ToString(); } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { throw new NotImplementedException(); } }

<StackPanel Orientation="Vertical"> <TextBox Name="tb1" Width="100" FontSize="30" Text="25" /> <TextBox Name="tb2" Width="100" FontSize="30" Text="75" /> <TextBox Name="tb3" Width="100" FontSize="30" Text="55" /> <TextBox Name="tb4" Width="100" FontSize="30" Text="10" /> <TextBlock Width="100" FontSize="30"> <TextBlock.Text> <MultiBinding Converter="{StaticResource NumMultiConvert}"> <Binding ElementName="tb1" Path="Text" /> <Binding ElementName="tb2" Path="Text" /> <Binding ElementName="tb3" Path="Text" /> <Binding ElementName="tb4" Path="Text" /> </MultiBinding> </TextBlock.Text> </TextBlock> </StackPanel>