我是 MVVM 新手。为了学习,我创建了一个示例应用程序,以便在单击按钮时在文本框中显示消息。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?
我的代码类似于下面给出的。
View
<TextBox Name="MessageTextBox" Text="{Binding TestMessage}"/>
<Button Content="Show" Name="button1" Command="{Binding ShowCommand}">
<!-- Command Handler -->
</Button>
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
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));
}
}
}
- 在你的模型中,你的 textMessage 是一个 int 而不是字符串?
尝试这样的事情:
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
public class MyMessage: INotifyPropertyChanged
{
private string testMessage
public string TestMessage;
{
get{ return testMessage; }
set
{
testMessage = value;
this.OnPropertyChanged("TestMessage");
}
}
//INotifyChanged Events
}
XAML
<TextBox Text="{Binding Message.TestMessage, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
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