C# 在代码隐藏中多次绑定到TextBlock-我哪里出错了？

情况很简单，我在code behind中对TextBlock控件进行了多重绑定，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，我不知道哪里出错了

---

我能请教你一些建议吗？

这个错误在

StringFormat

中很简单。试试看：

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

如果向原始代码中添加：

multiTbBinding.FallbackValue = "Fallback";

然后，您将在

文本
属性中得到回退