C# 文本块'；在ViewModel中更改时，s文本值在视图中不更新

我用命令创建了一个提交按钮，根据用户是否在文本框中输入了正确的数字来更改文本块中的文本

    public string txtResults { get; set; }
    public string txtInput { get; set; }

        // Method to execute when submit command is processed
    public void submit() 
    {
        if (txtInput == number.ToString())
            txtResults = "Correct!";
        else
            txtResults = "Wrong!";
    }

“txtInput”是绑定到文本框并包含用户输入的成员txtResults'应该显示在文本块中。现在，当我在调试模式下单击submit按钮时，txtResults值被指定为“Correct！”字符串，但它不会在视图中更新

XAML：

<Window x:Class="WpfMVVP.WindowView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfMVVP"
    Title="Window View" Height="350" Width="525" Background="White">
<Grid>
    <Canvas>
        <Label Canvas.Left="153" Canvas.Top="89" Content="Guess a number between 1 and 5" Height="28" Name="label1" />
        <TextBox   Text="{Binding txtInput, UpdateSourceTrigger=PropertyChanged}" Canvas.Left="168" Canvas.Top="142" Height="23" Name="textBox1" Width="38" />
        <TextBlock Text="{Binding txtResults}" Canvas.Left="257" Canvas.Top="142" Height="23" Name="textBlock1" />
        <Button Command="{Binding Submit}" Canvas.Left="209" Canvas.Top="197" Content="Submit" Height="23" Name="button1" Width="75" />
    </Canvas>
</Grid>

---

现在它开始工作了！谢谢

请确保您的txtResults属性继承自INotifyPropertyChanged。您的视图模型也应该从中继承。让视图模型类继承INotifyPropertyChanged，并实现接口。然后将TxtResults属性替换为以下内容：

    private string _txtResults = string.Empty;
    public string TxtResults
    {
        get { return this._txtResults; }

       set
       {
            this._txtResults= value;
             this.RaisePropertyChangedEvent("TxtResults");
        }
    }

---

发布XAML和这些属性（txtResults和txtInput）的定义\

    private string _txtResults = string.Empty;
    public string TxtResults
    {
        get { return this._txtResults; }

       set
       {
            this._txtResults= value;
             this.RaisePropertyChangedEvent("TxtResults");
        }
    }