C#：确保绑定到同一数据源的多个控件保持同步

下面的代码示例演示如何使用 BindingSource 组件，将三个控件（两个文本框控件和一个 DataGridView 控件）绑定到 DataSet 中的同一列。该示例演示如何处理BindingComplete 事件，并确保当一个文本框的文本值更改时，会用正确的值更新其他文本框和 DataGridView 控件。

该示例使用 BindingSource 来绑定数据源和控件。或者，可以直接将控件绑定到数据源，并从窗体的 BindingContext 检索用于绑定的 BindingManagerBase，然后为BindingManagerBase 处理 BindingComplete 事件。有关如何进行此操作的示例，请参见 BindingManagerBase 的 BindingComplete 事件的相关帮助页。

// Declare the controls to be used.
private BindingSource bindingSource1;
private TextBox textBox1;
private TextBox textBox2;
private DataGridView dataGridView1;

private void InitializeControlsAndDataSource()
{
    // Initialize the controls and set location, size and 
    // other basic properties.
    this.dataGridView1 = new DataGridView();
    this.bindingSource1 = new BindingSource();
    this.textBox1 = new TextBox();
    this.textBox2 = new TextBox();
    this.dataGridView1.ColumnHeadersHeightSizeMode =
        DataGridViewColumnHeadersHeightSizeMode.AutoSize;
    this.dataGridView1.Dock = DockStyle.Top;
    this.dataGridView1.Location = new Point(0, 0);
    this.dataGridView1.Size = new Size(292, 150);
    this.textBox1.Location = new Point(132, 156);
    this.textBox1.Size = new Size(100, 20);
    this.textBox2.Location = new Point(12, 156);
    this.textBox2.Size = new Size(100, 20);
    this.ClientSize = new Size(292, 266);
    this.Controls.Add(this.textBox2);
    this.Controls.Add(this.textBox1);
    this.Controls.Add(this.dataGridView1);

    // Declare the DataSet and add a table and column.
    DataSet set1 = new DataSet();
    set1.Tables.Add("Menu");
    set1.Tables[0].Columns.Add("Beverages");

    // Add some rows to the table.
    set1.Tables[0].Rows.Add("coffee");
    set1.Tables[0].Rows.Add("tea");
    set1.Tables[0].Rows.Add("hot chocolate");
    set1.Tables[0].Rows.Add("milk");
    set1.Tables[0].Rows.Add("orange juice");

    // Set the data source to the DataSet.
    bindingSource1.DataSource = set1;

    //Set the DataMember to the Menu table.
    bindingSource1.DataMember = "Menu";

    // Add the control data bindings.
    dataGridView1.DataSource = bindingSource1;
    textBox1.DataBindings.Add("Text", bindingSource1, 
        "Beverages", true, DataSourceUpdateMode.OnPropertyChanged);
    textBox2.DataBindings.Add("Text", bindingSource1, 
        "Beverages", true, DataSourceUpdateMode.OnPropertyChanged);
    bindingSource1.BindingComplete += 
        new BindingCompleteEventHandler(bindingSource1_BindingComplete);
}

private void bindingSource1_BindingComplete(object sender, BindingCompleteEventArgs e)
{
    // Check if the data source has been updated, and that no error has occured.
    if (e.BindingCompleteContext == 
        BindingCompleteContext.DataSourceUpdate && e.Exception == null)

        // If not, end the current edit.
        e.Binding.BindingManagerBase.EndCurrentEdit();
}