c# - WPF 获取组合框选择的文本(MVVM)

Question

我有一个组合框，我想将选定的项目文本绑定(bind)到 View 模型中的一个字符串。

现在我有:

Xaml:

<ComboBox DataContext="{Binding AllDataTypes}" SelectedItem="{Binding Type}" />

View 模型:

private String type;

public String Type
{
    get
    {
        return type;
    }
    set
    {
        if (type == value)
        {
            return;
        }

        type = value;
        RaisePropertyChanged(() => Type);
    }
}

当我运行程序时出现异常:

BindingExpression path error: 'Type' property not found on 'object' ''ObservableCollection`1' (HashCode=34166919)'. BindingExpression:Path=Type; DataItem='ObservableCollection`1' (HashCode=34166919); target element is 'ComboBox' (Name=''); target property is 'SelectedItem' (type 'Object')

Answer 1

将 DataContext 更改为 ItemsSource:

<ComboBox ItemsSource="{Binding AllDataTypes}" SelectedItem="{Binding Type}" />