在代码隐藏中多次绑定到 TextBlock - 我在哪里弄错了？

Question

案例很简单，我在代码后面对 TextBlock 控件进行了多次绑定，如下所示：

TextBlock tb = new TextBlock();
tb.VerticalAlignment = VerticalAlignment.Center;
tb.HorizontalAlignment = HorizontalAlignment.Center;

MultiBinding multiTbBinding = new MultiBinding();
multiTbBinding.StringFormat = "{}{0} + {1}";
multiTbBinding.Bindings.Add(new Binding()
{
    Path = new PropertyPath("PraceLamania[" + vm.PraceLamania.IndexOf(dpl) + "].DPL_Temperatura"),
    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
    Mode = BindingMode.OneWay,
    Source = vm
});
multiTbBinding.Bindings.Add(new Binding()
{
    Path = new PropertyPath("PraceLamania[" + vm.PraceLamania.IndexOf(dpl) + "].DPL_Wynik"),
    UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
    Mode = BindingMode.OneWay,
    Source = vm
});

BindingOperations.SetBinding(tb, TextBlock.TextProperty, multiTbBinding);

当我进行单值绑定时，一切正常，但在这种情况下我不知道我哪里做错了。

请问有什么建议吗？

Answer 1

错误很简单StringFormat。尝试一下：

multiTbBinding.StringFormat = "{0} + {1}";

如果添加到您的原始代码中：

multiTbBinding.FallbackValue = "Fallback";

然后您将在 Text 属性.

中获得 Fallback

在代码隐藏中多次绑定到 TextBlock - 我在哪里弄错了？

Multiple binding to TextBlock in code behind - where did I mistake?

c#

wpf

text

mvvm

multibinding