Question

我有几个包含Classes的类，需要在WPF Forms中访问它们的属性。我试图绑定＆＃34; ppl＆＃34;的属性。控制。使用Path = ppl.wife显然是不正确的。（显然我是WPF的新手）

    public MainWindow()
    {
        InitializeComponent();

        department = "Rock Truck Drivers";

        emp = new employee();
        emp.first = "Fred";
        emp.last = "Flintsone";
        emp.address = "Bedrock";
        emp.ppl.kid = "Pebbles";
        emp.ppl.wife = "Wilma";

        DataContext = emp;
    }
}
public class employee
{
    public string first { get; set; }
    public string last { get; set; }
    public string address { get; set; }
    public other ppl = new other(); 
}
public class other
{
    public string kid { get; set; }
    public string wife { get; set; }
}

XAML

    <TextBox
        Width="120"
        Height="23"
        Margin="222,119,0,0"
        HorizontalAlignment="Left"
        VerticalAlignment="Top"
        Text="{Binding first, Mode=TwoWay}"
        TextWrapping="Wrap" />
    <TextBox
        Width="120"
        Height="23"
        Margin="222,155,0,0"
        HorizontalAlignment="Left"
        VerticalAlignment="Top"
        Text="{Binding Path=last, Mode=TwoWay}"
        TextWrapping="Wrap" />
    <TextBox
        Name="TextWife"
        Width="120"
        Height="23"
        Margin="222,196,0,0"
        Text="{Binding XPath=ppl.wife, Mode=TwoWay}"
        HorizontalAlignment="Left"
        VerticalAlignment="Top"
        TextWrapping="Wrap" />

Answer 1

这里有两个问题。首先，您的绑定使用XPath=ppl.wife。它应该是Path=ppl.wife。您也可以省略Path=部分（就像您绑定到first一样）。

第二个问题是WPF中的绑定通常不适用于字段（请参阅the Binding Source overview）。

公共语言运行时（CLR）对象

您可以绑定到任何公共语言运行时（CLR）对象的公共属性，子属性以及索引器。绑定引擎使用CLR反射来获取属性的值。或者，实现ICustomTypeDescriptor或具有已注册的TypeDescriptionProvider的对象也可以使用绑定引擎。

如果您将ppl字段更改为属性，则绑定将起作用。

public class Employee
{
    public string First { get; set; }
    public string Last { get; set; }
    public string Address { get; set; }
    public Other Ppl { get; } = new Other(); // Ppl is now a property rather than a field
}
public class Other
{
    public string Kid { get; set; }
    public string Wife { get; set; }
}

WPF XAML绑定嵌套对象属性

1 个答案: