C# 控件之数据绑定

时间:2022-09-07 03:58:00

增加一个委托方法,可以实现后台多线程直接更新UI界面的值,利用了控件的DataBindings,以及 INotifyPropertyChanged接口和事件委托机制。

如果只是通过INotifyPropertyChanged,可在前台单独更新界面,无法通过多线程进行界面值更新。 这可以利用委托和事件的机制,在UI加入事件,通过invoke进行委托调用 ,从而可以实现 。

另外一种方法是设置窗体的CheckForIllegalCrossThreadCalls =false,但该操作方法不是微软建议使用的多线程界面更新的方法。

新建一个winform程序,然后添加两个textbox 和一个button ,写入以下代码 。

using System;
using System.ComponentModel;
using System.Threading;
using System.Windows.Forms; namespace TestFrom
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
} private TestBind model = new TestBind();
private void Form1_Load(object sender, EventArgs e)
{
// CheckForIllegalCrossThreadCalls = false;
model.NoticeHandler += new PropertyNoticeHandler(PropertyNoticeHandler);
Binding bind1 = new Binding("Text", model, "Value");
Binding bind2 = new Binding("Text", model, "Name");
textBox1.DataBindings.Add(bind1);
textBox2.DataBindings.Add(bind2);
} private void PropertyNoticeHandler(object handle, string proName)
{
try
{
BeginInvoke(
new Action(() => model.Bind(proName)));
}
catch
{
}
} private void button1_Click(object sender, EventArgs e)
{
new Thread(() =>
{
while (true)
{
model.Value++;
model.Name = Guid.NewGuid().ToString(); Thread.Sleep(1000);
}
})
{
IsBackground = true
}.Start();
}
public event PropertyChangedEventHandler PropertyChanged;
} public class TestBind : INotifyPropertyChanged
{
private string name; public string Name
{
get { return name; }
set
{
name = value;
SendChangeInfo("Name");
}
} private int value; public int Value
{
get { return value; }
set
{
this.value = value;
SendChangeInfo("Value");
}
} private void SendChangeInfo(string propertyName)
{
if (NoticeHandler != null)
{
NoticeHandler(this, propertyName);
}
} public void Bind(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
} }
public event PropertyNoticeHandler NoticeHandler;
public event PropertyChangedEventHandler PropertyChanged;
} public delegate void PropertyNoticeHandler(object handle, string proName);
}