WPF / XAML：绑定到字典 <object, object> 按键输入

Question

I am programming a MVVM-application and in the ViewModel I created a property of the type Dictionary<Geschäftsjahr, object> .

The Geschäftsjahr -object has 2 properties and holds two different years (fe: 2017/18). The ToString()-Method returns the data in exactly this format.

Now I want to bind a certain entry of the dictionary with XAML to a TextBox. Is it possible, to access the dictionary in the following way:

<TextBox Text={Binding Path=ViewModelProperty[2017/18]} ... /> 

It's very important to access the dictionary over the key. Actually it doesn't work this way...

Thanks, Nicolas

Answer 1

Instead of overriding the ToString() method of the class, create a new property that returns the formatted dates. Please see below.

New property that returns the correct formatted dates :

public string DatesDisplayText => "(Do your formatting here)";

Then your xaml can look like this :

<TextBox Text={Binding Path=ViewModelProperty[Key].DatesDisplayText} ... />

Answer 2

Is it possible, to access the dictionary in the following way ...?

Only if the key of the dictionary is a compile-time constant like for example the int 1 or the string "abc".

It's not possible if the key is a Geschäftsjahr . Then you would better bind to a property that performs the lookup for you, eg:

public string Text => ViewModelProperty[new Geschäftsjahr(2017, 2018)];

XAML:

<TextBlock Text="{Binding Text}" />