C# - 将 TextBox 绑定(bind)到整数

Question

如何将 TextBox 绑定(bind)到整数？例如，将单元绑定(bind)到 textBox1。

public partial class Form1 : Form
{
    int unit;

    public Form1()
    {
        InitializeComponent();


    }

    private void Form1_Load(object sender, EventArgs e)
    {
        textBox1.DataBindings.Add("Text", unit, "???");
    }

Answer 1

它需要是实例的公共(public)属性；在这种情况下，“this”就足够了:

public int Unit {get;set;}
private void Form1_Load(object sender, EventArgs e)
{
    textBox1.DataBindings.Add("Text", this, "Unit");
}

对于双向通知，您需要 UnitChanged 或 INotifyPropertyChanged:

private int unit;
public event EventHandler UnitChanged; // or via the "Events" list
public int Unit {
    get {return unit;}
    set {
        if(value!=unit) {
            unit = value;
            EventHandler handler = UnitChanged;
            if(handler!=null) handler(this,EventArgs.Empty);
        }
    }
}

如果您不想在公共(public) API 上使用它，您可以将它包装在某处的隐藏类型中:

class UnitWrapper {
    public int Unit {get;set;}
}
private UnitWrapper unit = new UnitWrapper();
private void Form1_Load(object sender, EventArgs e)
{
    textBox1.DataBindings.Add("Text", unit, "Unit");
}

有关信息，“事件列表”的内容类似于:

    private static readonly object UnitChangedKey = new object();
    public event EventHandler UnitChanged
    {
        add {Events.AddHandler(UnitChangedKey, value);}
        remove {Events.AddHandler(UnitChangedKey, value);}
    }
    ...
    EventHandler handler = (EventHandler)Events[UnitChangedKey];
    if (handler != null) handler(this, EventArgs.Empty);