用文本框绑定不断更新的字符串 [英] Binding constantly updated string with textbox

问题描述

我希望将字符串与文本框绑定.该字符串在一个线程中不断更新:

I wish to bind a String with a textbox. The string is constantly being updated in a thread:

String inputread;

    public event PropertyChangedEventHandler PropertyChanged;

    public string InputRead
    {
        get { return inputread; }
        set
        {
            if (Equals(inputread, value) == true) return;
            inputread = value;
            this.OnPropertyChanged(nameof(this.inputread));
        }


    }
    void threadFunc()
    {
        try
        {
            while (threadRunning)
            {
                plc.Read();
                InputRead =plc.InputImage[1].ToString();
                MessageBox.Show(InputRead);
            }
        }
        catch (ThreadAbortException)
        {
        }
    }
    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }

后面的绑定声明:

Binding bind = new Binding("InputRead");
bind.Mode = BindingMode.OneWay;
BindingOperations.SetBinding(newtextbox, TextBox.TextProperty, bind);

我理解为什么这不起作用(文本框完全为空)的部分问题是因为我没有在线程每次运行时刷新它.我该怎么做?此外，我怀疑 Binding 声明有缺陷，我不确定如何.

I understand that part of the problem why this is not working (the textbox is completely empty) is because I do not refresh it every time the thread runs. How do I do it? Also I suspect the Binding declaration is flawed I am not sure how.

我阅读了关于数据绑定的 MSDN 文章，它帮助我走到了这一步.
我在谷歌上搜索了它，这就是我如何做到这一点，同样在早期的 Stackoverflow 的帮助下，仍然没有成功.

I read the MSDN article about data binding, it helped me get this far.
I googled it that is how i got this far, also with the help of Stackoverflow earlier, still no success.

我稍微编辑了代码，文本框仍然是空的(甚至不是 0).我正在使用 wpf！如果更容易，有人可以指导我使用 dispatcher.invoke 吗?

I edited the code a bit, still textbox is empty (not even 0). I am using wpf! If it is easier, could someone guide me to use dispatcher.invoke ?

谢谢！

推荐答案

您需要创建一个属性并将TextBox绑定到该属性

You need create a property and bind TextBox to the property

private string _Inputed;
public string Inputed
{
    get { return _Inputed; }
    set 
    {
        if(Equals(_Inputed, value) == true) return;
        _Inputed = value;
        this.OnPropertyChanged(nameof(this.Inputed));
    }
}

void threadFunc()
{
    try
    {
        while (threadRunning)
        {
            plc.Read();
            this.Inputed = plc.InputImage[1].ToString();
        }
    }
    catch (ThreadAbortException)
    {
    }
}

public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
    {
        handler(this, new PropertyChangedEventArgs(name));
    }
}

XAML

<TextBlock Text="{Binding Path=Inputed}"/>

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