wpf 如何使用 MVVM 和 MVVM 工具包将属性绑定到文本框？
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How To Bind a Property to Textbox using MVVM and MVVM toolkit?
提问by niknowj
I am new to MVVM. to learn I created a sample application to show a message in a text box while clicking on button. In my code the button command is working properly but the property is not binding to the Textbox. How to bind Property to Textbox using MVVM?
我是 MVVM 的新手。为了学习，我创建了一个示例应用程序，用于在单击按钮时在文本框中显示一条消息。在我的代码中，按钮命令工作正常，但该属性未绑定到文本框。如何使用 MVVM 将属性绑定到文本框？
My code is similar like given below.
我的代码类似于下面给出的代码。
View
看法
<TextBox Name="MessageTextBox" Text="{Binding TestMessage}"/>
<Button Content="Show" Name="button1" Command="{Binding ShowCommand}">
<!-- Command Handler -->
</Button>
View Model
查看模型
MyMessage myMessage;
public MainViewModel()
{
myMessage=new MyMessage();
}
//inside the ShowCommand Handler
TestMessage="Hello World";
// A Property to set TextBox Value.
Model
模型
public class MyMessage: INotifyPropertyChanged
{
private string testMessage;
public string TestMessage
{
get { return testMessage; }
set
{
testMessage= value;
OnPropertyChanged("TestName");
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
回答by emybob
- in your model you have the textMessage as being an int rather than string?
- 在您的模型中，您将 textMessage 作为 int 而不是字符串？
try something like this:
尝试这样的事情：
VIEWMODEL
视图模型
private MyMessage message;
public MainViewModel()
{
message = new MyMessage();
}
public MyMessage Message
{
get { return message;}
set { message = value;}
}
//in your command:
this.Message.TestMessage = "Hello World!";
MODEL
模型
public class MyMessage: INotifyPropertyChanged
{
private string testMessage
public string TestMessage;
{
get{ return testMessage; }
set
{
testMessage = value;
this.OnPropertyChanged("TestMessage");
}
}
//INotifyChanged Events
}
XAML
XAML
<TextBox Text="{Binding Message.TestMessage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
回答by Nagg
I don't understand your code but I guess you should fix your binding with this:
我不明白你的代码，但我想你应该用这个修复你的绑定：
<TextBox Name="MessageTextBox" Text="{Binding MyMessage.TestMessage}"/>
Where MyMessageshould be a public property of MainViewModel
哪里MyMessage应该是公共财产MainViewModel
