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C#：确保绑定到同一数据源的多个控件保持同步

2024-07-09 21:48:44   221人阅读

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();}


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