无法从Xaml中的类调用sub [英] Cannot call sub from class in Xaml

问题描述

============================================ ========

MainWindow.xaml

================= ===================================

解决方案

您好OldeEnglishD，

INotifyPropertyChanged接口用于通知视图或ViewModel哪个属性绑定无关紧要;它已更新。

但我没有看到你在View或ViewModel中定义ServerID，也没有在窗口UI中绑定ServerID属性。

例如，我做了一个你可以采取措施的样本：

< StackPanel> 
< StackPanel> 
< TextBlock 
 Width =" 200" 
高度="30" 
 Text =" {Binding Name}" /> 
< TextBlock 
 Width =" 200" 
高度="30" 
 Margin =" 10" 
 Text =" {Binding Age}" /> 
< / StackPanel> 
< Button 
 Name =" btn1" 
 Width =" 200" 
高度="30" 
 Click =" btn1_Click" 
 Content =" btn1" /> 
< / StackPanel> 

 public partial class Window22：Window 
 {
 public viewmodel1 model {get;组; } 
 public Window22（）
 {
 InitializeComponent（）; 
 model = new viewmodel1（）; 
 this.DataContext = model; 
} 
 
 private void btn1_Click（object sender，RoutedEventArgs e）
 {
 model.Name =" Cherry" ;; 
 model.Age = 26; 
} 
} 
 
公共类viewmodel1：ViewModelBase 
 {
 private string _Name; 
公共字符串名称
 {
 get {return _Name; } 
设置
 {
 _Name = value; 
 RaisePropertyChanged（" Name"）; 
} 
} 
 
 private Int32 _Age; 
 public Int32年龄
 {
 get {return _Age; } 
设置
 {
 _Age = value; 
 RaisePropertyChanged（" Age"）; 
} 
} 
 
 public viewmodel1（）
 {
 Name =" Mattew" ;; 
年龄= 24; 
} 
} 

公共类ViewModelBase：INotifyPropertyChanged 
 {
 
公共事件PropertyChangedEventHandler的PropertyChanged; 
 
 
 public void RaisePropertyChanged（string propertyName）
 {
 PropertyChangedEventHandler handler = PropertyChanged; 
 if（handler！= null）
 {
 handler（this，new PropertyChangedEventArgs（propertyName））; 
} 
} 
} 

最好的问候，

Cherry

====================================================

MainWindow.xaml

====================================================

解决方案

Hi OldeEnglishD,

INotifyPropertyChanged interface is used to notify the view or ViewModel that it does not matter which property is binding; it is updated.

But I don't see you define ServerID in View or ViewModel, and you don't bind ServerID property in window UI.

For example, I do one sample that you can take a lo0k:

 <StackPanel>
        <StackPanel>
            <TextBlock
                Width="200"
                Height="30"
                Text="{Binding Name}" />
            <TextBlock
                Width="200"
                Height="30"
                Margin="10"
                Text="{Binding Age}" />
        </StackPanel>
        <Button
            Name="btn1"
            Width="200"
            Height="30"
            Click="btn1_Click"
            Content="btn1" />
    </StackPanel>

public partial class Window22 : Window
    {
        public viewmodel1 model { get; set; }
        public Window22()
        {
            InitializeComponent();
            model = new viewmodel1();
            this.DataContext = model;
        }

        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            model.Name = "Cherry";
            model.Age = 26;
        }
    }

    public class viewmodel1:ViewModelBase
    {
        private string _Name;
        public string Name
        {
            get { return _Name; }
            set
            {
                _Name = value;
                RaisePropertyChanged("Name");
            }
        }

        private Int32 _Age;
        public Int32 Age
        {
            get { return _Age; }
            set
            {
                _Age = value;
                RaisePropertyChanged("Age");
            }
        }

        public viewmodel1()
        {
            Name = "Mattew";
            Age = 24;
        }
    }

public class ViewModelBase:INotifyPropertyChanged
    {
          
        public event PropertyChangedEventHandler PropertyChanged;

        
        public void RaisePropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

Best Regards,

Cherry

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