如何将我的2路数据从$ C $绑定C-背后XAML [英] How to move my 2-way Data Binding from Code-Behind to XAML
问题描述
相对较新的世界粮食计划署和C＃（长期PHP程序员）...
我成功地建立了2-WAY数据一个文本框和一个对象的属性之间的绑定。我是能够建立在code-后面的约束力，但不这样做在XAML来代替。
我想学习如何做绑定在XAML来代替。也就是说，在下面的例子中，如何招行 myTestPanel.DataContext = CURRENT_NETWORK; 从code-背后的XAML
我看了看教程，范例等，但没有帮助......他们好像要我到文本框（或父对象）绑定到一个类，而不是一个对象。一些例子建议结合与合适的构造一类。但我并不想这样做。我要绑定可能已存在一段时间的现有对象。我所能做的只是在code-背后...但如何做到这一点的XAML呢？
罚款下面是我的code背后：
命名空间网
{
公共类网络
{
公众诠释ID {搞定;组; } //属性必然的TextBox
} 公共部分类主窗口：窗口
{
网络CURRENT_NETWORK =新的网络（）; //我的目标（这本来是一段时间了） 公共主窗口（）
{
的InitializeComponent（）; CURRENT_NETWORK.ID = 123; //该对象被设置... // **下面是我要学习如何移动到XAML行**
myTestPanel.DataContext = CURRENT_NETWORK; //＆LT; - 临界线
}
}
}
和这里的XAML的一个片段：
＆LT;窗口x：类=net.MainWindow
//一些行省略
XMLNS：地方=CLR的命名空间：网
＆GT;＆LT; DockPanel中NAME =myTestPanel＆GT;
＆LT;文本框的文本={绑定路径= ID，模式=双向}＆GT;＆LT; /文本框＆GT;
＆LT; / DockPanel中＆GT;
2路绑定工作，像一个梦:)我可以在文本框中看到该对象的ID属性值，反之如果我在TextBox编辑号码，对象正确修改。 （我观察到一个按钮带来了一个消息框，而不是在我的code片段所示）。
但我怎么动关键TextBox和现有的对象之间的结合（即行 myTestPanel.DataContext = CURRENT_NETWORK; ）从code-背后的XAML？ 谢谢！
PS：为什么我想要做的XAML的约束力？部分的只是为了学习的，部分是因为我觉得这是更优雅/可读性，因为XAML已经包含了属性的名称。即，我想这样做在XAML中的所有绑定，而不是一些有有的在code-落后。
很抱歉我不能添加评论，所以张贴的答案。
我的建议，你只是有单独的类作为您的视图模型例如 NetWorkViewModel 和您的视图模型中创建您的现有对象类型的属性并更改XAML绑定为好。
公共类NetworkViewModel：INotifyPropertyChanged的
{
公共事件PropertyChangedEventHandler的PropertyChanged;
专用网络_model;
公共网络模型
{
{返回_model; }
组
{
_model =价值;
OnPropertyChanged（模式）;
}
} 私人无效OnPropertyChanged（字符串propertyName的）
{}
}公共类网络：INotifyPropertyChanged的
{
公共事件PropertyChangedEventHandler的PropertyChanged;
私人诠释_id;
公众诠释标识
{
{返回_id; }
组
{
_id =价值;
OnPropertyChanged（ID）;
}
} 私人无效OnPropertyChanged（字符串propertyName的）
{}
}
在XAML中
的xmlns：VM =CLR的命名空间：网
...
＆LT; Window.DataContext＆GT;
＆LT; VM：NetworkViewModel /＆GT;
＆LT; /Window.DataContext>
...
＆LT; DockPanel中NAME =myTestPanel＆GT;
＆LT;文本框的文本={绑定路径= Model.Id，模式=双向}＆GT;＆LT; /文本框＆GT;
＆LT; / DockPanel中＆GT;
这是做的一种方式。看了一些MVVM教程中，你会得到一些其他的想法。
Relatively new to WFP and C# (longtime PHP programmer)...
I successfully set up 2-WAY data binding between a TextBox and a Property of an Object. I was able to establish the binding in the Code-Behind, but not do it in the XAML instead.
I would like to learn how to do the BINDING in the XAML instead. That is, in the example below, how to move the line myTestPanel.DataContext = CURRENT_NETWORK; from the Code-Behind to the XAML?
I looked at tutorials, examples, etc., but none helped... They seem to want me to bind the TextBox (or parent object) to a CLASS, not to an OBJECT. Some examples suggest binding to a class with suitable constructors. But I do not want to do that. I want to bind to an EXISTING OBJECT that may have existed for some time. I can do it just fine in the Code-Behind... But how to do it in the XAML instead?
Here's my Code Behind:
namespace net
{
public class network
{
public int ID { get; set; } // Property bound to TextBox
}
public partial class MainWindow : Window
{
network CURRENT_NETWORK = new network(); // My OBJECT (which could have been around for a while)
public MainWindow()
{
InitializeComponent();
CURRENT_NETWORK.ID = 123; // The object gets set up...
// ** Below is the line I want to learn how to move to XAML **
myTestPanel.DataContext = CURRENT_NETWORK; // <- CRITICAL LINE
}
}
}
and here's a snippet of the XAML:
<Window x:Class="net.MainWindow"
// some lines omitted
xmlns:local="clr-namespace:net"
>
<DockPanel Name="myTestPanel" >
<TextBox Text="{Binding Path=ID, Mode=TwoWay}"></TextBox>
</DockPanel>
The 2-way binding works like a dream :) I can see in the TextBox the value in the object's ID Property, and conversely if I edit the number in the TextBox, the object is correctly modified. (I observed that with a button bringing up a message box, not shown in my code snippet.)
BUT how do I move that critical binding between TextBox and EXISTING OBJECT (i.e. the line myTestPanel.DataContext = CURRENT_NETWORK;) from the Code-Behind to the XAML? THANKS!
PS: why do I want to do the binding in the XAML? Partially just for learning, and partially because I think it'd be more elegant/readable, since the XAML already contains the name of the Property. I.e., I'd like to do all the bindings in the XAML rather than some there and some in the Code-Behind.
Sorry I could not able to add comment, so posting it as answer.
What I am suggesting you is just have separate class as your ViewModel e.g. NetWorkViewModel and inside your ViewModel create a property of your EXISTING OBJECT type and change the bindings in XAML as well.
public class NetworkViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private Network _model;
public Network Model
{
get { return _model; }
set
{
_model = value;
OnPropertyChanged("Model");
}
}
private void OnPropertyChanged(string propertyName)
{ }
}
public class Network : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private int _id;
public int Id
{
get { return _id; }
set
{
_id = value;
OnPropertyChanged("Id");
}
}
private void OnPropertyChanged(string propertyName)
{ }
}
In your Xaml
xmlns:vm="clr-namespace:net"
...
<Window.DataContext>
<vm:NetworkViewModel />
</Window.DataContext>
...
<DockPanel Name="myTestPanel" >
<TextBox Text="{Binding Path=Model.Id, Mode=TwoWay}"></TextBox>
</DockPanel>
This is one way of doing. Read some MVVM tutorial you will get some other ideas.
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