为什么 silverlight 中的双向绑定不起作用？
根据 Silverlight TwoWay 绑定的工作原理，当我更改 FirstName 字段中的数据时，它应该更改 CheckFirstName 字段中的值。
为什么情况并非如此？
回答：
谢谢 Jeff，就是这样，对于其他人来说：这里是 带有可下载代码的完整解决方案。
XAML：
<StackPanel>
<Grid x:Name="GridCustomerDetails">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="300"/>
</Grid.ColumnDefinitions>
<TextBlock VerticalAlignment="Center" Margin="10" Grid.Row="0" Grid.Column="0">First Name:</TextBlock>
<TextBox Margin="10" Grid.Row="0" Grid.Column="1" Text="{Binding FirstName, Mode=TwoWay}"/>
<TextBlock VerticalAlignment="Center" Margin="10" Grid.Row="1" Grid.Column="0">Last Name:</TextBlock>
<TextBox Margin="10" Grid.Row="1" Grid.Column="1" Text="{Binding LastName}"/>
<TextBlock VerticalAlignment="Center" Margin="10" Grid.Row="2" Grid.Column="0">Address:</TextBlock>
<TextBox Margin="10" Grid.Row="2" Grid.Column="1" Text="{Binding Address}"/>
</Grid>
<Border Background="Tan" Margin="10">
<TextBlock x:Name="CheckFirstName"/>
</Border>
</StackPanel>
隐藏代码：
public Page()
{
InitializeComponent();
Customer customer = new Customer();
customer.FirstName = "Jim";
customer.LastName = "Taylor";
customer.Address = "72384 South Northern Blvd.";
GridCustomerDetails.DataContext = customer;
Customer customerOutput = (Customer)GridCustomerDetails.DataContext;
CheckFirstName.Text = customer.FirstName;
}
According to how Silverlight TwoWay binding works, when I change the data in the FirstName field, it should change the value in CheckFirstName field.
Why is this not the case?
ANSWER:
Thank you Jeff, that was it, for others: here is the full solution with downloadable code.
XAML:
<StackPanel>
<Grid x:Name="GridCustomerDetails">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="300"/>
</Grid.ColumnDefinitions>
<TextBlock VerticalAlignment="Center" Margin="10" Grid.Row="0" Grid.Column="0">First Name:</TextBlock>
<TextBox Margin="10" Grid.Row="0" Grid.Column="1" Text="{Binding FirstName, Mode=TwoWay}"/>
<TextBlock VerticalAlignment="Center" Margin="10" Grid.Row="1" Grid.Column="0">Last Name:</TextBlock>
<TextBox Margin="10" Grid.Row="1" Grid.Column="1" Text="{Binding LastName}"/>
<TextBlock VerticalAlignment="Center" Margin="10" Grid.Row="2" Grid.Column="0">Address:</TextBlock>
<TextBox Margin="10" Grid.Row="2" Grid.Column="1" Text="{Binding Address}"/>
</Grid>
<Border Background="Tan" Margin="10">
<TextBlock x:Name="CheckFirstName"/>
</Border>
</StackPanel>
Code behind:
public Page()
{
InitializeComponent();
Customer customer = new Customer();
customer.FirstName = "Jim";
customer.LastName = "Taylor";
customer.Address = "72384 South Northern Blvd.";
GridCustomerDetails.DataContext = customer;
Customer customerOutput = (Customer)GridCustomerDetails.DataContext;
CheckFirstName.Text = customer.FirstName;
}
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评论（3）
您的
Customer类型必须支持INotifyPropertyChanged以便绑定知道您的FirstName属性值何时发生更改。此教程可能会帮助您将代码工作。
Your
Customertype has to supportINotifyPropertyChangedin order for the binding to know when yourFirstNameproperty value has changed.This tutorial may help you in getting your code to work.
网格容器内的控件不知道 FirstName、LastName 和 Address 是什么。 我认为您需要将网格绑定到代码隐藏中的对象：
现在该容器内的每个控件都可以绑定到 Customer 的属性。 您可以像这样绑定它：
在后面的代码中，确保“Customer”是一个类对象，并且是公开声明的。
如果这不起作用，请尝试将 x:Name="" 添加到顶部的页面声明和命名空间。
我希望这有帮助！
Your controls inside of the Grid container have no idea what FirstName, LastName, and Address are. I think that you need to bind your grid to the object in the codebehind:
Now every control inside of that container can be bound to a property of Customer. You bind it like so:
In your code behind, make sure that "Customer" is a class object, and is declared publicly.
If this doesn't work, try adding an x:Name="" to the page declarations and namespaces at the top.
I hope this helps!
解决方案是使用
CheckFirstName的元素绑定solution is use element binding for
CheckFirstName