C＃DataBinding - 自动将更改的属性写入标签或文本框 [英] C# DataBinding - automatically writing changed property to label or textbox

问题描述

我读了一些关于DataBinding，大部分复杂的东西，比如SQL或者是什么XAML和东西。
所有我想我的程序要做的是，如果变量的值只是将它写入文本框或标签。 （使用WindowsForms）

到目前为止我有：

 命名空间DataBinding_Test 
 {
 public partial class Form1：Form 
 {
 
 BindingSource bs = new BindingSource（）; 
 Class1 test = new Class1（）; 
 
 public Form1（）
 {
 InitializeComponent（）; 
 
 test.name =Hello; 
 bs.DataSource = test; 
 
 label1.DataBindings.Add（new Binding（Text，bs，name，false，DataSourceUpdateMode.OnPropertyChanged））; 
 
} 
 
 private void button1_Click（object sender，EventArgs e）
 {
 test.name = textBox1.Text; 
} 
} 
} 
  

Class1只有一个公共属性名称。启动时lable1会显示我的Hello字符串。然后在按钮上单击名称属性将更改。在调试中，我看到bs的实际数据源包含新的属性值，但标签不会显示任何内容...

有没有任何真实的简单方法这个？

Backround是：周期性地会有RS232的传感器数据轮询。如果一个传感器的值更改，我想在标签或文本框中显示。现在一个backroundthreaded定时器将需要调用和东西来访问GUI线程;认为这将更容易与数据绑定，但似乎没有：P

感谢所有，伟大的网站，伟大的工作！ ：

解决方案

另一种让事情工作而不实现 INotifyPropertyChanged / p>

  class Class1 
 {
 private string name; 
 
 public string Name 
 {
 get {return name; } 
 set 
 {
 //检查是否分配相同的值。取决于你的业务逻辑
 //这里是最简单的检查
 if（Equals（name，value））
 return; 
 name = value; 
 OnNameChanged（）; 
} 
 
 public event EventHandler NameChanged; 
 
 protected virtual void OnNameChanged（）
 {
 var handler = NameChanged; 
 if（handler！= null）
 handler（this，EventArgs.Empty）; 
} 
} 
} 
  

诀窍是让事件其名称与财产名称相结合，更改后缀，并在属性值更改时提高

I read some about DataBinding, mostly complicated things like SQL or whatever XAML and stuff. All I want my programm to do is, if the "value" of a variable changes just write it in a textbox or label. (using WindowsForms)

So far what I have:

namespace DataBinding_Test
{
    public partial class Form1 : Form
    {

    BindingSource bs = new BindingSource();
    Class1 test = new Class1();

    public Form1()
    {
        InitializeComponent();

        test.name = "Hello";
        bs.DataSource = test;

        label1.DataBindings.Add(new Binding("Text", bs, "name", false, DataSourceUpdateMode.OnPropertyChanged));

    }

    private void button1_Click(object sender, EventArgs e)
    {
        test.name = textBox1.Text;
    }
  }
}

Class1 just has a public property name. On startup lable1 will show my "Hello" string. Then on button click the name property will change. On debug I saw the actual DataSource of "bs" contains the new property value, but the label will not show anything...

Is there any realtivly easy way to do this?

The Backround is: periodically there will be a polling of sensor data throug RS232. If the value of one sensor changes I want to show this in label or textbox. Now a backroundthreaded timer will need invokes and stuff to access the GUI thread; thought this would be easier with databinding but seems not :P

Thanks to all, great site, great work! :)

解决方案

Another way to make things work without implementing INotifyPropertyChanged

class Class1
{
    private string name;

    public string Name
    {
        get { return name; }
        set
        {
            //Check if you are assigning the same value. Depends on your business logic
            //here is the simplest check
            if (Equals(name, value))
                return;
            name = value;
            OnNameChanged();
        }

        public event EventHandler NameChanged;

        protected virtual void OnNameChanged()
        {
            var handler = NameChanged;
            if (handler != null)
                handler(this, EventArgs.Empty);
        }
    }
}

The trick is to have event with the name combined by name of property and Changed suffix and to raise it whenever value of your property is changed

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