同时写入两个文本框 [英] Writing to two textboxes simultaneously

问题描述

在我的 WPF 应用程序中，我有两个文本框，我正在寻找以下内容:

In my WPF app I have two textboxes, and I am looking for the following:

我希望如果用户在 textbox1 上写一些东西，应用程序会将相同的值放入 textbox2，

I want that if the user writes something on textbox1 the app would put the same value into textbox2,

<TextBox x:Name="textbox1"/>
<TextBox x:Name="textbox2"/>

有没有一种优雅的方法来做到这一点?

Is there an elegant way to do this?

推荐答案

以下内容将起作用:

<TextBox x:Name="textbox1" />
<TextBox x:Name="textbox2" Text="{Binding ElementName=textbox1, Path=Text}"/>

现在这样做的是 Text 属性 textbox2 被绑定到 Text 属性<代码>文本框1.您在 textbox1 中所做的每个更改都会自动反映在 textbox2 中.

Now what this does is that the Text property of textbox2 is bound to the Text property of textbox1. Every change you do in textbox1 will automatically be reflected in textbox2.

根据您的评论，以下是您可能想要做的解决方案:

Based on your comment, here's a solution which might be what you want to do:

<TextBox x:Name="textbox1" Text="{Binding TheText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
<TextBox x:Name="textbox2" Text="{Binding TheText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

并添加这个 C# 类:

and add this C# class:

public class MySimpleViewModel : INotifyPropertyChanged
{
    private string theString = String.Empty;

    public string TheString
    {
        get => this.theString;
        set
        {
            if(this.theString != value)
            {
                this.RaisePropertyChanged();
                this.theString = value;
            }
        }
    }
        
    public event PropertyChangedEventHandler PropertyChanged;

    public virtual void RaisePropertyChanged([CallerMemberName] string propertyName = null)
    {
        this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

我没有展示的是如何将 MySimpleViewModel 与实际视图连接起来.但是，如果您对此有疑问，我当然也可以证明这一点.

What I did not show is how to wire up the MySimpleViewModel with the actual view. However, if you have problems with that, I can certainly show that as well.

希望有帮助.

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