c# Winform同一数据源多个控件保持同步
作者：zhuanghamiao
通过对控件属性设置数据源绑定，利用Windows数据更改通知这一特性，只要订阅(设定绑定)的控件都能接收到数据的变化通知。
通过DataBindings方法实现双向数据绑定
在了解Windows窗体数据绑定直接，对控件数据绑定一般都是直接对控件可接收值的属性赋值，如文本框的Text属性，但在做一些列表数据处理时，同一份数据要多处处理，对各个控件的属性逐一赋值显得比较麻烦。通过对控件属性设置数据源绑定，利用Windows数据更改通知这一特性，只要订阅(设定绑定)的控件都能接收到数据的变化通知。
通过DataBindings方法实现双向数据绑定
textBox1.DataBindings.Add("Text", trackBar1, "Value", true, DataSourceUpdateMode.OnPropertyChanged);
实现 INotifyPropertyChanged 接口，当属性值更改时引发事件通知
private Serial serial;
public Form3()
{
InitializeComponent();
serial = new Serial();
this.textBox1.DataBindings.Add("Text", serial, "Number", true, DataSourceUpdateMode.OnPropertyChanged);
}
private void button1_Click(object sender, EventArgs e)
{
serial.Number += 1;
}
public class Serial : INotifyPropertyChanged
{
private int number;
public int Number
{
get { return number; }
set
{
if (value != number)
{
number = value;
NotifyPropertyChanged();
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
BindingList实现了双向Windows窗体数据绑定所需的主要接口。通过将BindingSource数据源绑定到控件，可以使多个控件保持数据同步
public partial class Form1 : Form
{
private IList<Foo> foos;
private BindingList<Foo> bindingList;
public Form1()
{
InitializeComponent();
dataGridView1.MultiSelect = false;
// 数据源
foos = new List<Foo> {
new Foo(){Id=Guid.NewGuid().ToString(), Field1="张三",Field2="选项一",Field3=DateTime.Now.AddYears(-6),Field4="1918731555X",Field5="云南省昆明市...街道66号"},
new Foo(){Id=Guid.NewGuid().ToString(), Field1="李四",Field2="选项二",Field3=DateTime.Now.AddYears(-7),Field4="1918731556X",Field5="云南省玉溪市...街道56号"},
new Foo(){Id=Guid.NewGuid().ToString(), Field1="王五",Field2="选项一",Field3=DateTime.Now.AddYears(-8),Field4="1918731557X",Field5="云南省红河州...街道46号"},
new Foo(){Id=Guid.NewGuid().ToString(), Field1="赵六",Field2="选项三",Field3=DateTime.Now.AddYears(-9),Field4="1918731558X",Field5="云南省楚雄州...街道36号"},
};
this.Load += Form1_Load;
}
private void Form1_Load(object sender, EventArgs e)
{
bindingList = new BindingList<Foo>(foos);
var source = new BindingSource(bindingList, null);
// 控件数据绑定
dataGridView1.DataSource = source;
textBox1.DataBindings.Add("Text", source, "Field1", true, DataSourceUpdateMode.OnPropertyChanged);
comboBox1.DataBindings.Add("Text", source, "Field2", true, DataSourceUpdateMode.OnPropertyChanged);
dateTimePicker1.DataBindings.Add("Value", source, "Field3", true, DataSourceUpdateMode.OnPropertyChanged);
textBox2.DataBindings.Add("Text", source, "Field4", true, DataSourceUpdateMode.OnPropertyChanged);
textBox3.DataBindings.Add("Text", source, "Field5", true, DataSourceUpdateMode.OnPropertyChanged);
bindingList.AddingNew += BindingList_AddingNew;
}
private void BindingList_AddingNew(object sender, AddingNewEventArgs e)
{
e.NewObject = new Foo() { Id = Guid.NewGuid().ToString() };
}
// 保存
private void button1_Click(object sender, EventArgs e)
{
}
// 新增
private void button2_Click(object sender, EventArgs e)
{
// 方式一
//bindingList.Add(new Foo() { Id = Guid.NewGuid().ToString() });
//int selectIndex = dataGridView1.Rows.Count - 1;
//dataGridView1.Rows[selectIndex].Selected = true;
//dataGridView1.CurrentCell = dataGridView1.Rows[selectIndex].Cells[0];
//方式二
var foo = bindingList.AddNew();
}
// 删除
private void button3_Click(object sender, EventArgs e)
{
bindingList.RemoveAt(dataGridView1.CurrentRow.Index);
dataGridView1.Rows[0].Selected = true;
dataGridView1.CurrentCell = dataGridView1.Rows[0].Cells[0];
}
}
class Foo
{
public string Id { get; set; }
public string Field1 { get; set; }
public string Field2 { get; set; }
public DateTime Field3 { get; set; }
public string Field4 { get; set; }
public string Field5 { get; set; }
}
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