逐步解說：連接至物件中的資料 (Windows Form)
本逐步解說將建立物件來保存客戶和訂單資料，以及每個物件的物件資料來源。 物件資料來源會出現在 [資料來源] 視窗中：項目是從這個視窗拖曳到表單上，以建立繫結至每個物件之公用屬性資料的控制項。 此逐步解說也將示範如何使用 TableAdapter，以便從資料庫擷取資料，並填入物件。
物件資料來源的建立方式，可以透過執行資料來源組態精靈並選取 [物件] 做為資料來源之型別。 完成 [資料來源組態精靈] 之後，您就可以從資料來源視窗將可用物件的公用屬性拖曳至表單上。
本逐步解說所述的工作包括下列各項：
建立新的 [Windows Form 應用程式] 專案。
建立表示客戶和訂單的自訂物件。
使用 [資料來源組態精靈]，根據自訂物件建立及設定物件資料來源。
將控制項加入到繫結至自訂物件中之資料的表單。
使用 TableAdapter 建立資料集，在物件和資料庫之間移動資料。
編輯 TableAdapter 的主查詢。
將查詢加入到 TableAdapter。
將資料庫的資料填入物件中。
建立專案
若要建立新的 Windows Form 應用程式專案
從 [檔案] 功能表中，建立 [新增專案]。
在 [專案類型] 窗格中，按一下您想要使用之語言節點下的 [Windows]。
按一下 [範本] 窗格中的 [Windows Form 應用程式]。
在 [名稱] 方塊中輸入 ObjectBindingWalkthrough，再按一下 [確定]。
隨即建立 ObjectBindingWalkthrough 專案，並將其加入至 [方案總管]。
這個逐步解說需要繫結一些物件。 第一個步驟是建立表示客戶和訂單的一些範例物件。 若要表示客戶，將會建立一個表示單一客戶的 Customer 物件。 若要表示訂單，將會建立一個表示單一訂單的 Order 物件以及一個表示 Order 物件集合的 Orders 物件。 而 Customer 物件的集合則將使用 BindingSource 類別中的內建集合 (本逐步解說稍後會加以說明)。
建立 Customer 物件
若要建立 Customer 物件
在 [專案] 功能表上按一下 [加入類別]。
將新類別命名為 Customer，再按一下 [加入]。
將 Customer 類別檔中的程式碼替換成下列程式碼：
.gif "注意事項")
注意事項Customer 物件包含型別 Orders 的 ordersCollection 屬性。編輯器將顯示指出 [型別 'Orders' 未定義] 的訊息。這是預期的錯誤訊息，當您在下節建立 Order 和 Orders 類別時，它就會消失。
''' <summary> ''' A single customer ''' </summary> Public Class Customer Public Sub New() End Sub ''' <summary> ''' Creates a new customer ''' </summary> ''' <param name="customerId">The ID that uniquely identifies this customer</param> ''' <param name="companyName">The name for this customer</param> ''' <param name="contactName">The name for this customer's contact</param> ''' <param name="contactTitle">The title for this contact</param> ''' <param name="address">The address for this customer</param> ''' <param name="city">The city for this customer</param> ''' <param name="region">The region for this customer</param> ''' <param name="postalCode">The postal code for this customer</param> ''' <param name="country">The country for this customer</param> ''' <param name="phone">The phone number for this customer</param> ''' <param name="fax">The fax number for this customer</param> Public Sub New(ByVal customerId As String, ByVal companyName As String, ByVal contactName As String, ByVal contactTitle As String, ByVal address As String, ByVal city As String, ByVal region As String, ByVal postalCode As String, ByVal country As String, ByVal phone As String, ByVal fax As String) customerIDValue = customerId companyNameValue = companyName contactNameValue = contactName contactTitleValue = contactTitle addressValue = address cityValue = city regionValue = region postalCodeValue = postalCode countryValue = country phoneValue = phone faxValue = fax End Sub Private customerIDValue As String ''' <summary> ''' The ID that uniquely identifies this customer ''' </summary> Public Property CustomerID() As String Get Return customerIDValue End Get Set(ByVal value As String) customerIDValue = value End Set End Property Private companyNameValue As String ''' <summary> ''' The name for this customer ''' </summary> Public Property CompanyName() As String Get Return companyNameValue End Get Set(ByVal Value As String) companyNameValue = Value End Set End Property Private contactNameValue As String ''' <summary> ''' The name for this customer's contact ''' </summary> Public Property ContactName() As String Get Return contactNameValue End Get Set(ByVal Value As String) contactNameValue = Value End Set End Property Private contactTitleValue As String ''' <summary> ''' The title for this contact ''' </summary> Public Property ContactTitle() As String Get Return contactTitleValue End Get Set(ByVal Value As String) contactTitleValue = Value End Set End Property Private addressValue As String ''' <summary> ''' The address for this customer ''' </summary> Public Property Address() As String Get Return addressValue End Get Set(ByVal Value As String) addressValue = Value End Set End Property Private cityValue As String ''' <summary> ''' The city for this customer ''' </summary> Public Property City() As String Get Return cityValue End Get Set(ByVal Value As String) cityValue = Value End Set End Property Private regionValue As String ''' <summary> ''' The region for this customer ''' </summary> Public Property Region() As String Get Return regionValue End Get Set(ByVal Value As String) regionValue = Value End Set End Property Private postalCodeValue As String ''' <summary> ''' The postal code for this customer ''' </summary> Public Property PostalCode() As String Get Return postalCodeValue End Get Set(ByVal Value As String) postalCodeValue = Value End Set End Property Private countryValue As String ''' <summary> ''' The country for this customer ''' </summary> Public Property Country() As String Get Return countryValue End Get Set(ByVal Value As String) countryValue = Value End Set End Property Private phoneValue As String ''' <summary> ''' The phone number for this customer ''' </summary> Public Property Phone() As String Get Return phoneValue End Get Set(ByVal Value As String) phoneValue = Value End Set End Property Private faxValue As String ''' <summary> ''' The fax number for this customer ''' </summary> Public Property Fax() As String Get Return faxValue End Get Set(ByVal Value As String) faxValue = Value End Set End Property Private ordersCollection As New System.ComponentModel.BindingList(Of Order) ''' <summary> ''' The orders for this customer ''' </summary> Public Property Orders() As System.ComponentModel.BindingList(Of Order) Get Return ordersCollection End Get Set(ByVal value As System.ComponentModel.BindingList(Of Order)) ordersCollection = value End Set End Property Public Overrides Function ToString() As String Return Me.CompanyName & " (" & Me.CustomerID & ")" End Function End Classnamespace ObjectBindingWalkthrough { /// <summary> /// A single customer /// </summary> public class Customer { /// <summary> /// Creates a new customer /// </summary> public Customer() { } /// <summary> /// Creates a new customer /// </summary> /// <param name="customerID"></param> /// <param name="companyName"></param> /// <param name="contactName"></param> /// <param name="contactTitle"></param> /// <param name="address"></param> /// <param name="city"></param> /// <param name="region"></param> /// <param name="postalCode"></param> /// <param name="country"></param> /// <param name="phone"></param> /// <param name="fax"></param> public Customer(string customerID, string companyName, string contactName, string contactTitle, string address, string city, string region, string postalCode, string country, string phone, string fax) { customerIDValue = customerID; } private string customerIDValue; /// <summary> /// The ID that uniquely identifies this customer /// </summary> public string CustomerID { get { return customerIDValue; } set { customerIDValue = value; } } private string companyNameValue; /// <summary> /// The name for this customer /// </summary> public string CompanyName { get { return companyNameValue; } set { companyNameValue = value; } } private string contactNameValue; /// <summary> /// The name for this customer's contact /// </summary> public string ContactName { get { return contactNameValue; } set { contactNameValue = value; } } private string contactTitleValue; /// <summary> /// The title for this contact /// </summary> public string ContactTitle { get { return contactTitleValue; } set { contactTitleValue = value; } } private string addressValue; /// <summary> /// The address for this customer /// </summary> public string Address { get { return addressValue; } set { addressValue = value; } } private string cityValue; /// <summary> /// The city for this customer /// </summary> public string City { get { return cityValue; } set { cityValue = value; } } private string regionValue; /// <summary> /// The region for this customer /// </summary> public string Region { get { return regionValue; } set { regionValue = value; } } private string postalCodeValue; /// <summary> /// The postal code for this customer /// </summary> public string PostalCode { get { return postalCodeValue; } set { postalCodeValue = value; } } private string countryValue; /// <summary> /// The country for this customer /// </summary> public string Country { get { return countryValue; } set { countryValue = value; } } private string phoneValue; /// <summary> /// The phone number for this customer /// </summary> public string Phone { get { return phoneValue; } set { phoneValue = value; } } private string faxValue; /// <summary> /// The fax number for this customer /// </summary> public string Fax { get { return faxValue; } set { faxValue = value; } } private System.ComponentModel.BindingList<Order> ordersCollection = new System.ComponentModel.BindingList<Order>(); public System.ComponentModel.BindingList<Order> Orders { get { return ordersCollection; } set { ordersCollection = value; } } public override string ToString() { return this.CompanyName + " (" + this.CustomerID + ")"; } } }
建立 Order 物件
建立 Order 物件和 Orders 集合
選取 [專案] 功能表上的 [加入類別]。
將新類別命名為 Order，再按一下 [加入]。
將 Order 類別檔中的程式碼替換成下列程式碼：
''' <summary> ''' A single order ''' </summary> Public Class Order Public Sub New() End Sub ''' <summary> ''' Creates a new order ''' </summary> ''' <param name="orderid">The identifier for this order</param> ''' <param name="customerID">The customer who placed this order</param> ''' <param name="employeeID">The ID of the employee who took this order</param> ''' <param name="orderDate">The date this order was placed</param> ''' <param name="requiredDate">The date this order is required</param> ''' <param name="shippedDate">The date the order was shipped</param> ''' <param name="shipVia">The shipping method for this order</param> ''' <param name="freight">The freight charge for this order</param> ''' <param name="shipName">The name of the recipient for this order</param> ''' <param name="shipAddress">The address to ship this order to</param> ''' <param name="shipCity">The city to ship this order to</param> ''' <param name="shipRegion">The region to ship this order to</param> ''' <param name="shipPostalCode">The postal code to ship this order to</param> ''' <param name="shipCountry">The country to ship this order to</param> Public Sub New(ByVal orderid As Integer, ByVal customerID As String, ByVal employeeID As Nullable(Of Integer), ByVal orderDate As Nullable(Of DateTime), ByVal requiredDate As Nullable(Of DateTime), ByVal shippedDate As Nullable(Of DateTime), ByVal shipVia As Nullable(Of Integer), ByVal freight As Nullable(Of Decimal), ByVal shipName As String, ByVal shipAddress As String, ByVal shipCity As String, ByVal shipRegion As String, ByVal shipPostalCode As String, ByVal shipCountry As String) orderIDValue = orderid customerIDValue = customerID employeeIDValue = employeeID orderDateValue = orderDate requiredDateValue = requiredDate shippedDateValue = shippedDate shipViaValue = shipVia freightValue = freight shipAddressValue = shipAddress shipCityValue = shipCity shipRegionValue = shipRegion shipPostalCodeValue = shipPostalCode shipCountryValue = shipCountry End Sub Private orderIDValue As Integer ''' <summary> ''' Identifier for this order ''' </summary> Public Property OrderID() As Integer Get Return orderIDValue End Get Set(ByVal value As Integer) orderIDValue = value End Set End Property Private customerIDValue As String ''' <summary> ''' The customer who placed this order ''' </summary> Public Property CustomerID() As String Get Return customerIDValue End Get Set(ByVal Value As String) customerIDValue = Value End Set End Property Private employeeIDValue As Nullable(Of Integer) ''' <summary> ''' The ID of the employee who took this order ''' </summary> Public Property EmployeeID() As Nullable(Of Integer) Get Return employeeIDValue End Get Set(ByVal Value As Nullable(Of Integer)) employeeIDValue = Value End Set End Property Private orderDateValue As Nullable(Of DateTime) ''' <summary> ''' The date this order was placed ''' </summary> Public Property OrderDate() As Nullable(Of DateTime) Get Return orderDateValue End Get Set(ByVal Value As Nullable(Of DateTime)) orderDateValue = Value End Set End Property Private requiredDateValue As Nullable(Of DateTime) ''' <summary> ''' The date this order is required ''' </summary> Public Property RequiredDate() As Nullable(Of DateTime) Get Return requiredDateValue End Get Set(ByVal Value As Nullable(Of DateTime)) requiredDateValue = Value End Set End Property Private shippedDateValue As Nullable(Of DateTime) ''' <summary> ''' The date this order was shipped ''' </summary> Public Property ShippedDate() As Nullable(Of DateTime) Get Return shippedDateValue End Get Set(ByVal Value As Nullable(Of DateTime)) shippedDateValue = Value End Set End Property Private shipViaValue As Nullable(Of Integer) ''' <summary> ''' The shipping method for this order ''' </summary> Public Property ShipVia() As Nullable(Of Integer) Get Return shipViaValue End Get Set(ByVal Value As Nullable(Of Integer)) shipViaValue = Value End Set End Property Private freightValue As Nullable(Of Decimal) ''' <summary> ''' The freight charge for this order ''' </summary> Public Property Freight() As Nullable(Of Decimal) Get Return freightValue End Get Set(ByVal Value As Nullable(Of Decimal)) freightValue = Value End Set End Property Private shipNameValue As String ''' <summary> ''' The name of the recipient for this order ''' </summary> Public Property ShipName() As String Get Return shipNameValue End Get Set(ByVal Value As String) shipNameValue = Value End Set End Property Private shipAddressValue As String ''' <summary> ''' The address to ship this order to ''' </summary> Public Property ShipAddress() As String Get Return shipAddressValue End Get Set(ByVal Value As String) shipAddressValue = Value End Set End Property Private shipCityValue As String ''' <summary> ''' The city to ship this order to ''' </summary> Public Property ShipCity() As String Get Return shipCityValue End Get Set(ByVal Value As String) shipCityValue = Value End Set End Property Private shipRegionValue As String ''' <summary> ''' The region to ship this order to ''' </summary> Public Property ShipRegion() As String Get Return shipRegionValue End Get Set(ByVal Value As String) shipRegionValue = Value End Set End Property Private shipPostalCodeValue As String ''' <summary> ''' The postal code to ship this order to ''' </summary> Public Property ShipPostalCode() As String Get Return shipPostalCodeValue End Get Set(ByVal Value As String) shipPostalCodeValue = Value End Set End Property Private shipCountryValue As String ''' <summary> ''' The country to ship this order to ''' </summary> Public Property ShipCountry() As String Get Return shipCountryValue End Get Set(ByVal Value As String) shipCountryValue = Value End Set End Property Private customerValue As Customer ''' <summary> ''' The customer this order belongs to ''' </summary> Public Property Customer() As Customer Get Return customerValue End Get Set(ByVal Value As Customer) customerValue = Value End Set End Property End Class ''' <summary> ''' A collection of Orders ''' </summary> Public Class Orders Inherits System.ComponentModel.BindingList(Of Order) End Classusing System; namespace ObjectBindingWalkthrough { /// <summary> /// A single order /// </summary> public class Order { /// <summary> /// Creates a new order /// </summary> public Order() { } /// <summary> /// Creates a new order /// </summary> /// <param name="orderid"></param> /// <param name="customerID"></param> /// <param name="employeeID"></param> /// <param name="orderDate"></param> /// <param name="requiredDate"></param> /// <param name="shippedDate"></param> /// <param name="shipVia"></param> /// <param name="freight"></param> /// <param name="shipName"></param> /// <param name="shipAddress"></param> /// <param name="shipCity"></param> /// <param name="shipRegion"></param> /// <param name="shipPostalCode"></param> /// <param name="shipCountry"></param> public Order(int orderid, string customerID, Nullable<int> employeeID, Nullable<DateTime> orderDate, Nullable<DateTime> requiredDate, Nullable<DateTime> shippedDate, Nullable<int> shipVia, Nullable<decimal> freight, string shipName, string shipAddress, string shipCity, string shipRegion, string shipPostalCode, string shipCountry) { } private int orderIDValue; /// <summary> /// The ID that uniquely identifies this order /// </summary> public int OrderID { get { return orderIDValue; } set { orderIDValue = value; } } private string customerIDValue; /// <summary> /// The customer who placed this order /// </summary> public string CustomerID { get { return customerIDValue; } set { customerIDValue = value; } } private Nullable<int> employeeIDValue; /// <summary> /// The ID of the employee who took this order /// </summary> public Nullable<int> EmployeeID { get { return employeeIDValue; } set { employeeIDValue = value; } } private Nullable<DateTime> orderDateValue; /// <summary> /// The date this order was placed /// </summary> public Nullable<DateTime> OrderDate { get { return orderDateValue; } set { orderDateValue = value; } } private Nullable<DateTime> requiredDateValue; /// <summary> /// The date this order is required /// </summary> public Nullable<DateTime> RequiredDate { get { return requiredDateValue; } set { requiredDateValue = value; } } private Nullable<DateTime> shippedDateValue; /// <summary> /// The date this order was shipped /// </summary> public Nullable<DateTime> ShippedDate { get { return shippedDateValue; } set { shippedDateValue = value; } } private Nullable<int> shipViaValue; /// <summary> /// The shipping method of this order /// </summary> public Nullable<int> ShipVia { get { return shipViaValue; } set { shipViaValue = value; } } private Nullable<decimal> freightValue; /// <summary> /// The freight charge for this order /// </summary> public Nullable<decimal> Freight { get { return freightValue; } set { freightValue = value; } } private string shipNameValue; /// <summary> /// The name of the recipient for this order /// </summary> public string ShipName { get { return shipNameValue; } set { shipNameValue = value; } } private string shipAddressValue; /// <summary> /// The address to ship this order to /// </summary> public string ShipAddress { get { return shipAddressValue; } set { shipAddressValue = value; } } private string shipCityValue; /// <summary> /// The city to ship this order to /// </summary> public string ShipCity { get { return shipCityValue; } set { shipCityValue = value; } } private string shipRegionValue; /// <summary> /// The region to ship this order to /// </summary> public string ShipRegion { get { return shipRegionValue; } set { shipRegionValue = value; } } private string shipPostalCodeValue; /// <summary> /// The postal code to ship this order to /// </summary> public string ShipPostalCode { get { return shipPostalCodeValue; } set { shipPostalCodeValue = value; } } private string shipCountryValue; /// <summary> /// The country to ship this order to /// </summary> public string ShipCountry { get { return shipCountryValue; } set { shipCountryValue = value; } } } /// <summary> /// A collection of Order objects /// </summary> class Orders : System.ComponentModel.BindingList<Order> { } }從 [檔案] 功能表上，選擇 [全部儲存]。
建立物件資料來源
執行 [資料來源組態精靈]，以便根據前一步驟建立的物件來建立資料來源。
建立物件資料來源
建置您的專案。
注意事項您必須建置專案，才能在 [資料來源組態精靈] 選取專案中的物件。
按一下 [資料] 功能表，並選取 [顯示資料來源]，即可開啟 [資料來源] 視窗。
按一下 [資料來源] 視窗中的 [加入新資料來源]。
[資料來源組態精靈] 隨即開啟。
選取 [選擇資料來源類型] 頁面上的 [物件]，再按 [下一步]。
展開 [選取資料物件] 頁面上的 [ObjectBindingWalkthrough] 節點，然後選取 [Customer] 物件旁邊的核取方塊。
按一下 [完成]。
[Customer] 物件隨即出現在 [資料來源] 視窗中。
建立資料繫結表單
繫結至 Customer 物件的控制項建立方式，是從 [資料來源] 視窗將項目拖曳到表單上。
若要建立繫結至物件屬性之控制項的表單
從 [方案總管] 中，選取 [Form1]，再按一下 [檢視表設計工具]。
將 [Customer] 節點從 [資料來源] 視窗拖曳至 [Form1]。
展開 [Customer] 節點，並從 [資料來源] 視窗將 [Orders] 節點拖曳到 [Form1] 上。
建立 TableAdapter，將資料庫中的資料載入到自訂物件中
若要在物件和資料庫之間移動資料，將會使用 TableAdapter。 您可以使用資料來源組態精靈來建立客戶和訂單資料表的 TableAdapter。
若要建立 TableAdapter
選擇 [資料] 功能表上的 [加入新資料來源]。
在 [選擇資料來源類型] 頁面上，選取 [資料庫]，再按 [下一步]。
在 [選擇資料庫模型] 頁面上，選取 [資料集]，再按 [下一步]。
在 [選擇資料連接] 頁面上，使用下列其中一個程序：
如果下拉式清單中有提供 Northwind 範例資料庫的資料連接，請選取這個資料連接。
-或-
選取 [新增連接]，設定與 Northwind 資料庫之間的新資料連接。 如需詳細資訊，請參閱 HOW TO：連接至資料庫中的資料。
在選取資料連接後，請按 [下一步]。
按一下 [將連接字串儲存到應用程式組態檔] 頁面上的 [下一步]。
在 [選擇您的資料庫物件] 頁面上，展開 [資料表] 節點。
選取 [Customers] 和 [Orders] 資料表，再按一下 [完成]。
[NorthwindDataSet] 會加入專案中，且 [Customers] 和 [Orders] 資料表會出現在 [NorthwindDataSet] 節點下方的 [資料來源] 視窗中。
將資料集和 TableAdapter 加入到 Form1
您可以從 [工具箱] 拖曳 CustomersTableAdapter、OrdersTableAdapter 和 NorthwindDataSet 的代表性元件，將它們的執行個體加入到表單上。
若要將 Customers 資料表中的資料填入 Customer 物件
從 [建置] 功能表中，選取 [建置方案]。
從 [工具箱] 將 [NorthwindDataSet] 拖曳至 [Form1] 上。
從 [工具箱] 將 [CustomersTableAdapter] 拖曳至 [Form1] 上。
從 [工具箱] 將 [OrdersTableAdapter] 拖曳至 [Form1] 上。
將查詢加入到 CustomersTableAdapter，以便只傳回少數客戶
在實際的應用程式中，您可能永遠都不會傳回整個資料表。 在此逐步解說中，將會傳回前五名客戶。
| 注意事項 |
|---|
您通常會傳入參數，以選取想要傳回的客戶；但是為了簡潔起見，此逐步解說中會以硬式編碼方式來編碼查詢，以便僅傳回五名客戶，而且不需要建立使用者介面來輸入參數值。 |
若要將其他查詢加入至 CustomersTableAdapter
在 [方案總管] 中，按兩下 NorthwindDataSet.xsd 檔。
NorthwindDataSet 隨即在 [DataSet 設計工具] 中開啟。
以滑鼠右鍵按一下 [CustomersTableAdapter]，並選取 [加入查詢]。
TableAdapter 查詢組態精靈隨即開啟。
保留 [使用 SQL 陳述式] 的預設值，再按一下 [下一步]。
保留 [傳回資料列的 SELECT] 的預設值，再按一下 [下一步]。
以下列項目取代 SQL 陳述式，再按一下 [下一步]：
SELECT Top 5 CustomerID, CompanyName, ContactName, ContactTitle, Address, City, Region, PostalCode, Country, Phone, Fax FROM Customers清除 [填入 DataTable] 核取方塊。
將 [傳回 DataTable] 方法命名為 GetTop5Customers，然後按一下 [完成]。
[GetTop5Customers] 查詢即會加入到 [CustomersTableAdapter]。
修改 OrdersTableAdapter 上的查詢，以便只傳回所需客戶的訂單
從資料庫擷取訂單時，您可能不會想要傳回訂單的整個資料表，而只需要特定客戶的訂單。 下列程序將詳述如何重新設定具有新查詢的 TableAdapter (與上一個步驟中，將其他查詢加入 [CustomersTableAdapter] 剛好相反)。
若要重新設定 TableAdapter 的主要查詢來傳回單一客戶的訂單
以滑鼠右鍵按一下 [OrdersTableAdapter]，並選擇 [設定]。
TableAdapter 查詢組態精靈隨即開啟。
以下列項目取代 SQL 陳述式，再按一下 [下一步]：
SELECT OrderID, CustomerID, EmployeeID, OrderDate, RequiredDate, ShippedDate, ShipVia, Freight, ShipName, ShipAddress, ShipCity, ShipRegion, ShipPostalCode, ShipCountry FROM Orders WHERE CustomerID = @CustomerID清除 [填入 DataTable] 核取方塊。
將 [傳回 DataTable] 方法命名為 GetDataByCustomerID，然後按一下 [完成]。
OrdersTableAdapter 的主要 Fill 查詢即會替換為 [GetDataByCustomerID] 查詢。
選取 [建置] 功能表中的 [建置方案]，以建置專案。
加入程式碼，以便將資料載入到 Customer 和 Order 物件中
若要將資料載入到自訂物件中，您可執行將傳回新資料表的 TableAdapter 查詢 (而不是使用填入現有資料表的 TableAdapter 查詢)。 然後，程式碼在資料表中執行迴圈，除了填入每一個 Customer.Orders 集合中的所有訂單之外，還會將客戶資訊填入每一個 Customer 物件。 請注意每個 Customer 物件加入至 CustomerBindingSource 的內部集合 (CustomerBindingSource.Add(currentCustomer)) 的方式。 BindingSource 會提供可透過 List 屬性存取的 Customers 內建強型別集合。
若要載入具有資料的物件
從 [方案總管] 中，選取 [Form1]，再按一下 [檢視程式碼]。
將 [Form1] 中的程式碼取代成下列程式碼：
Public Class Form1 Private Sub LoadCustomers() Dim customerData As NorthwindDataSet.CustomersDataTable = CustomersTableAdapter1.GetTop5Customers() Dim customerRow As NorthwindDataSet.CustomersRow For Each customerRow In customerData Dim currentCustomer As New Customer() With currentCustomer .CustomerID = customerRow.CustomerID .CompanyName = customerRow.CompanyName If Not customerRow.IsAddressNull Then .Address = customerRow.Address End If If Not customerRow.IsCityNull Then .City = customerRow.City End If If Not customerRow.IsContactNameNull Then .ContactName = customerRow.ContactName End If If Not customerRow.IsContactTitleNull Then .ContactTitle = customerRow.ContactTitle End If If Not customerRow.IsCountryNull Then .Country = customerRow.Country End If If Not customerRow.IsFaxNull Then .Fax = customerRow.Fax End If If Not customerRow.IsPhoneNull Then .Phone = customerRow.Phone End If If Not customerRow.IsPostalCodeNull Then .PostalCode = customerRow.PostalCode End If If Not customerRow.Is_RegionNull Then .Region = customerRow._Region End If End With LoadOrders(currentCustomer) CustomerBindingSource.Add(currentCustomer) Next End Sub Private Sub LoadOrders(ByRef currentCustomer As Customer) Dim orderData As NorthwindDataSet.OrdersDataTable = OrdersTableAdapter1.GetDataByCustomerID(currentCustomer.CustomerID) Dim orderRow As NorthwindDataSet.OrdersRow For Each orderRow In orderData Dim currentOrder As New Order() With currentOrder .OrderID = orderRow.OrderID .Customer = currentCustomer If Not orderRow.IsCustomerIDNull Then .CustomerID = orderRow.CustomerID End If If Not orderRow.IsEmployeeIDNull Then .EmployeeID = orderRow.EmployeeID End If If Not orderRow.IsFreightNull Then .Freight = orderRow.Freight End If If Not orderRow.IsOrderDateNull Then .OrderDate = orderRow.OrderDate End If If Not orderRow.IsRequiredDateNull Then .RequiredDate = orderRow.RequiredDate End If If Not orderRow.IsShipAddressNull Then .ShipAddress = orderRow.ShipAddress End If If Not orderRow.IsShipCityNull Then .ShipCity = orderRow.ShipCity End If If Not orderRow.IsShipCountryNull Then .ShipCountry = orderRow.ShipCountry End If If Not orderRow.IsShipNameNull Then .ShipName = orderRow.ShipName End If If Not orderRow.IsShippedDateNull Then .ShippedDate = orderRow.ShippedDate End If If Not orderRow.IsShipPostalCodeNull Then .ShipPostalCode = orderRow.ShipPostalCode End If If Not orderRow.IsShipRegionNull Then .ShipRegion = orderRow.ShipRegion End If If Not orderRow.IsShipViaNull Then .ShipVia = orderRow.ShipVia End If End With currentCustomer.Orders.Add(currentOrder) Next End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load LoadCustomers() End Sub End Classusing System; using System.Windows.Forms; namespace ObjectBindingWalkthrough { public partial class Form1 : Form { public Form1() { InitializeComponent(); this.Load += Form1_Load; } private void LoadCustomers() { NorthwindDataSet.CustomersDataTable customerData = customersTableAdapter1.GetTop5Customers(); foreach (NorthwindDataSet.CustomersRow customerRow in customerData) { Customer currentCustomer = new Customer(); currentCustomer.CustomerID = customerRow.CustomerID; currentCustomer.CompanyName = customerRow.CompanyName; if (customerRow.IsAddressNull() == false) { currentCustomer.Address = customerRow.Address; } if (customerRow.IsCityNull() == false) { currentCustomer.City = customerRow.City; } if (customerRow.IsContactNameNull() == false) { currentCustomer.ContactName = customerRow.ContactName; } if (customerRow.IsContactTitleNull() == false) { currentCustomer.ContactTitle = customerRow.ContactTitle; } if (customerRow.IsCountryNull() == false) { currentCustomer.Country = customerRow.Country; } if (customerRow.IsFaxNull() == false) { currentCustomer.Fax = customerRow.Fax; } if (customerRow.IsPhoneNull() == false) { currentCustomer.Phone = customerRow.Phone; } if (customerRow.IsPostalCodeNull() == false) { currentCustomer.PostalCode = customerRow.PostalCode; } if (customerRow.IsRegionNull() == false) { currentCustomer.Region = customerRow.Region; } LoadOrders(currentCustomer); customerBindingSource.Add(currentCustomer); } } private void LoadOrders(Customer currentCustomer) { NorthwindDataSet.OrdersDataTable orderData = ordersTableAdapter1.GetDataByCustomerID(currentCustomer.CustomerID); foreach (NorthwindDataSet.OrdersRow orderRow in orderData) { Order currentOrder = new Order(); currentOrder.OrderID = orderRow.OrderID; if (orderRow.IsCustomerIDNull() == false) { currentOrder.CustomerID = orderRow.CustomerID; } if (orderRow.IsEmployeeIDNull() == false) { currentOrder.EmployeeID = orderRow.EmployeeID; } if (orderRow.IsFreightNull() == false) { currentOrder.Freight = orderRow.Freight; } if (orderRow.IsOrderDateNull() == false) { currentOrder.OrderDate = orderRow.OrderDate; } if (orderRow.IsRequiredDateNull() == false) { currentOrder.RequiredDate = orderRow.RequiredDate; } if (orderRow.IsShipAddressNull() == false) { currentOrder.ShipAddress = orderRow.ShipAddress; } if (orderRow.IsShipCityNull() == false) { currentOrder.ShipCity = orderRow.ShipCity; } if (orderRow.IsShipCountryNull() == false) { currentOrder.ShipCountry = orderRow.ShipCountry; } if (orderRow.IsShipNameNull() == false) { currentOrder.ShipName = orderRow.ShipName; } if (orderRow.IsShippedDateNull() == false) { currentOrder.ShippedDate = orderRow.ShippedDate; } if (orderRow.IsShipPostalCodeNull() == false) { currentOrder.ShipPostalCode = orderRow.ShipPostalCode; } if (orderRow.IsShipRegionNull() == false) { currentOrder.ShipRegion = orderRow.ShipRegion; } if (orderRow.IsShipViaNull() == false) { currentOrder.ShipVia = orderRow.ShipVia; } currentCustomer.Orders.Add(currentOrder); } } private void Form1_Load(object sender, EventArgs e) { LoadCustomers(); } } }
測試應用程式
若要測試應用程式
按下 F5 執行應用程式。
表單隨即開啟，且會將範例資料填入 DataGridView 控制項。
巡覽 DataGridView 中的客戶，以顯示其關聯的訂單。
後續步驟
若要在應用程式中加入功能
加入程式碼，將自訂物件中的資料傳回資料庫。 如需詳細資訊，請參閱 HOW TO：以 TableAdapter 直接存取資料庫。
選取 DataGridView 智慧標籤上的 [編輯資料行]，重新排列 [DataGridView] 中的資料行。