如何：访问绑定到 Windows 窗体 DataGridView 行的对象
有时，显示业务对象集合中存储的信息的表很有用。 将 DataGridView 控件绑定到此类集合时，每个公共属性都将在它自己的列中显示，除非该属性已用 BrowsableAttribute 标记为不可浏览。 例如，Customer 对象的集合将具有如**“姓名”和“地址”**等列。
如果这些对象包含您希望访问的附加信息和代码，则可以通过行对象来实现。 在下面的代码示例中，用户可以选择多行并单击一个按钮将发票发送给每个对应客户。
访问行绑定对象
使用 DataGridViewRow.DataBoundItem 属性。
Private Sub InvoiceButton_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles InvoiceButton.Click For Each row As DataGridViewRow In Me.DataGridView1.SelectedRows Dim cust As Customer = TryCast(row.DataBoundItem, Customer) If cust IsNot Nothing Then cust.SendInvoice() End If Next End Subvoid invoiceButton_Click(object sender, EventArgs e) { foreach (DataGridViewRow row in this.dataGridView1.SelectedRows) { Customer cust = row.DataBoundItem as Customer; if (cust != null) { cust.SendInvoice(); } } }
示例
完整的代码示例包括一个简单的 Customer 实现，并将 DataGridView 绑定到一个包含几个 Customer 对象的 ArrayList。 因为在 Form.Load 事件处理程序之外无法访问客户集合，所以 System.Windows.Forms.Button 的 Click 事件处理程序必须通过行访问 Customer 对象。
Imports System
Imports System.Windows.Forms
Public Class DataGridViewObjectBinding
Inherits Form
' These declarations and the Main() and New() methods
' below can be replaced with designer-generated code.
Private WithEvents InvoiceButton As New Button()
Private WithEvents DataGridView1 As New DataGridView()
' Entry point code.
<STAThreadAttribute()> _
Public Shared Sub Main()
Application.Run(New DataGridViewObjectBinding())
End Sub
' Sets up the form.
Public Sub New()
Me.DataGridView1.Dock = DockStyle.Fill
Me.Controls.Add(Me.DataGridView1)
Me.InvoiceButton.Text = "invoice the selected customers"
Me.InvoiceButton.Dock = DockStyle.Top
Me.Controls.Add(Me.InvoiceButton)
Me.Text = "DataGridView collection-binding demo"
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
' Set up a collection of objects for binding.
Dim customers As New System.Collections.ArrayList()
customers.Add(New Customer("Harry"))
customers.Add(New Customer("Sally"))
customers.Add(New Customer("Roy"))
customers.Add(New Customer("Pris"))
' Initialize and bind the DataGridView.
Me.DataGridView1.SelectionMode = _
DataGridViewSelectionMode.FullRowSelect
Me.DataGridView1.AutoGenerateColumns = True
Me.DataGridView1.DataSource = customers
End Sub
' Calls the SendInvoice() method for the Customer
' object bound to each selected row.
Private Sub InvoiceButton_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles InvoiceButton.Click
For Each row As DataGridViewRow In Me.DataGridView1.SelectedRows
Dim cust As Customer = TryCast(row.DataBoundItem, Customer)
If cust IsNot Nothing Then
cust.SendInvoice()
End If
Next
End Sub
End Class
Public Class Customer
Private nameValue As String
Public Sub New(ByVal name As String)
nameValue = name
End Sub
Public Property Name() As String
Get
Return nameValue
End Get
Set(ByVal value As String)
nameValue = value
End Set
End Property
Public Sub SendInvoice()
MsgBox(nameValue & " has been billed.")
End Sub
End Class
using System;
using System.Windows.Forms;
public class DataGridViewObjectBinding : Form
{
// These declarations and the Main() and New() methods
// below can be replaced with designer-generated code.
private Button invoiceButton = new Button();
private DataGridView dataGridView1 = new DataGridView();
// Entry point code.
[STAThreadAttribute()]
public static void Main()
{
Application.Run(new DataGridViewObjectBinding());
}
// Sets up the form.
public DataGridViewObjectBinding()
{
this.dataGridView1.Dock = DockStyle.Fill;
this.Controls.Add(this.dataGridView1);
this.invoiceButton.Text = "invoice the selected customers";
this.invoiceButton.Dock = DockStyle.Top;
this.invoiceButton.Click += new EventHandler(invoiceButton_Click);
this.Controls.Add(this.invoiceButton);
this.Load += new EventHandler(DataGridViewObjectBinding_Load);
this.Text = "DataGridView collection-binding demo";
}
void DataGridViewObjectBinding_Load(object sender, EventArgs e)
{
// Set up a collection of objects for binding.
System.Collections.ArrayList customers = new System.Collections.ArrayList();
customers.Add(new Customer("Harry"));
customers.Add(new Customer("Sally"));
customers.Add(new Customer("Roy"));
customers.Add(new Customer("Pris"));
// Initialize and bind the DataGridView.
this.dataGridView1.SelectionMode =
DataGridViewSelectionMode.FullRowSelect;
this.dataGridView1.AutoGenerateColumns = true;
this.dataGridView1.DataSource = customers;
}
// Calls the SendInvoice() method for the Customer
// object bound to each selected row.
void invoiceButton_Click(object sender, EventArgs e)
{
foreach (DataGridViewRow row in this.dataGridView1.SelectedRows)
{
Customer cust = row.DataBoundItem as Customer;
if (cust != null)
{
cust.SendInvoice();
}
}
}
}
public class Customer
{
private String nameValue;
public Customer(String name)
{
nameValue = name;
}
public String Name
{
get
{
return nameValue;
}
set
{
nameValue = value;
}
}
public void SendInvoice()
{
MessageBox.Show(nameValue + " has been billed.");
}
}
编译代码
此示例需要：
- 对 System 和 System.Windows.Forms 程序集的引用。
有关从 Visual Basic 或 Visual C# 的命令行生成此示例的信息，请参见从命令行生成 (Visual Basic) 或在命令行上使用 csc.exe 生成。 也可以通过将代码粘贴到新项目，在 Visual Studio 中生成此示例。 有关更多信息，请参见 如何：使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和 如何：使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和 如何：使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和 如何：使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例 和 如何：使用 Visual Studio 编译和运行完整的 Windows 窗体代码示例.
请参见
任务
如何：将对象绑定到 Windows 窗体 DataGridView 控件