c# Winform同一數(shù)據(jù)源多個控件保持同步

更新時間：2021年06月16日 08:58:47 作者：zhuanghamiao

通過對控件屬性設(shè)置數(shù)據(jù)源綁定，利用Windows數(shù)據(jù)更改通知這一特性，只要訂閱(設(shè)定綁定)的控件都能接收到數(shù)據(jù)的變化通知。通過DataBindings方法實(shí)現(xiàn)雙向數(shù)據(jù)綁定

在了解Windows窗體數(shù)據(jù)綁定直接，對控件數(shù)據(jù)綁定一般都是直接對控件可接收值的屬性賦值，如文本框的Text屬性，但在做一些列表數(shù)據(jù)處理時，同一份數(shù)據(jù)要多處處理，對各個控件的屬性逐一賦值顯得比較麻煩。通過對控件屬性設(shè)置數(shù)據(jù)源綁定，利用Windows數(shù)據(jù)更改通知這一特性，只要訂閱(設(shè)定綁定)的控件都能接收到數(shù)據(jù)的變化通知。
通過DataBindings方法實(shí)現(xiàn)雙向數(shù)據(jù)綁定

textBox1.DataBindings.Add("Text", trackBar1, "Value", true, DataSourceUpdateMode.OnPropertyChanged);

實(shí)現(xiàn) INotifyPropertyChanged 接口，當(dāng)屬性值更改時引發(fā)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實(shí)現(xiàn)了雙向Windows窗體數(shù)據(jù)綁定所需的主要接口。通過將BindingSource數(shù)據(jù)源綁定到控件，可以使多個控件保持?jǐn)?shù)據(jù)同步

public partial class Form1 : Form
{
    private IList<Foo> foos;
    private BindingList<Foo> bindingList;

    public Form1()
    {
        InitializeComponent();
        dataGridView1.MultiSelect = false;
        // 數(shù)據(jù)源
        foos = new List<Foo> {
            new Foo(){Id=Guid.NewGuid().ToString(), Field1="張三",Field2="選項(xiàng)一",Field3=DateTime.Now.AddYears(-6),Field4="1918731555X",Field5="云南省昆明市...街道66號"},
            new Foo(){Id=Guid.NewGuid().ToString(), Field1="李四",Field2="選項(xiàng)二",Field3=DateTime.Now.AddYears(-7),Field4="1918731556X",Field5="云南省玉溪市...街道56號"},
            new Foo(){Id=Guid.NewGuid().ToString(), Field1="王五",Field2="選項(xiàng)一",Field3=DateTime.Now.AddYears(-8),Field4="1918731557X",Field5="云南省紅河州...街道46號"},
            new Foo(){Id=Guid.NewGuid().ToString(), Field1="趙六",Field2="選項(xiàng)三",Field3=DateTime.Now.AddYears(-9),Field4="1918731558X",Field5="云南省楚雄州...街道36號"},
        };

        this.Load += Form1_Load;
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        bindingList = new BindingList<Foo>(foos);
        var source = new BindingSource(bindingList, null);
        // 控件數(shù)據(jù)綁定
        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();
    }

    // 刪除
    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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