管理 DataViews (ADO.NET)

更新： November 2007

您可以使用 DataViewManager 管理 DataView 內所有資料表的檢視設定。如果您想將某個控制項繫結至多個資料表，例如巡覽關聯性的方格，DataViewManager 是理想的選擇。

DataViewManager 包含 DataViewSetting 物件的集合，這些物件可用來設定 DataSet 之資料表的檢視設定。在 DataSet 中，每一個資料表的 DataViewSettingCollection 都會包含一個 DataViewSetting 物件。您可以使用參考資料表的 DataViewSetting，來設定參考資料表的預設 ApplyDefaultSort、Sort、RowFilter 和 RowStateFilter 屬性。您可以參考特定資料表的 DataViewSetting，方法是透過名稱或序數參考，或將參考傳遞給這個特定資料表物件；此外，您還可以使用 DataViewSettings 屬性來存取 DataViewManager 中的 DataViewSetting 物件集合。

下列程式碼範例以 SQL Server Northwind 資料庫的 Customers、Orders 和 Order Details 資料表來填入 DataSet、在資料表之間建立關聯性、使用 DataViewManager 設定預設 DataView 設定，並將 DataGrid 繫結至 DataViewManager。範例中設定 DataSet 內所有資料表的預設 DataView 設定依照資料表的主索引鍵排序 (ApplyDefaultSort = true)，接著將 Customers 資料表的排序順序修改為按照 CompanyName 排序。

' Assumes connection is a valid SqlConnection to Northwind.
' Create a Connection, DataAdapters, and a DataSet.
Dim custDA As SqlDataAdapter = New SqlDataAdapter( _
  "SELECT CustomerID, CompanyName FROM Customers", connection)
Dim orderDA As SqlDataAdapter = New SqlDataAdapter( _
  "SELECT OrderID, CustomerID FROM Orders", connection)
Dim ordDetDA As SqlDataAdapter = New SqlDataAdapter( _
  "SELECT OrderID, ProductID, Quantity FROM [Order Details]", connection)

Dim custDS As DataSet = New DataSet()

' Open the Connection.
connection.Open()

    ' Fill the DataSet with schema information and data.
    custDA.MissingSchemaAction = MissingSchemaAction.AddWithKey
    orderDA.MissingSchemaAction = MissingSchemaAction.AddWithKey
    ordDetDA.MissingSchemaAction = MissingSchemaAction.AddWithKey

    custDA.Fill(custDS, "Customers")
    orderDA.Fill(custDS, "Orders")
    ordDetDA.Fill(custDS, "OrderDetails")

    ' Close the Connection.
    connection.Close()

    ' Create relationships.
    custDS.Relations.Add("CustomerOrders", _
          custDS.Tables("Customers").Columns("CustomerID"), _
          custDS.Tables("Orders").Columns("CustomerID"))

    custDS.Relations.Add("OrderDetails", _
          custDS.Tables("Orders").Columns("OrderID"), _
          custDS.Tables("OrderDetails").Columns("OrderID"))

' Create default DataView settings.
Dim viewManager As DataViewManager = New DataViewManager(custDS)

Dim viewSetting As DataViewSetting
For Each viewSetting In viewManager.DataViewSettings
  viewSetting.ApplyDefaultSort = True
Next

viewManager.DataViewSettings("Customers").Sort = "CompanyName"

' Bind to a DataGrid.
Dim grid As System.Windows.Forms.DataGrid = New System.Windows.Forms.DataGrid()
grid.SetDataBinding(viewManager, "Customers")

// Assumes connection is a valid SqlConnection to Northwind.
// Create a Connection, DataAdapters, and a DataSet.
SqlDataAdapter custDA = new SqlDataAdapter(
  "SELECT CustomerID, CompanyName FROM Customers", connection);
SqlDataAdapter orderDA = new SqlDataAdapter(
  "SELECT OrderID, CustomerID FROM Orders", connection);
SqlDataAdapter ordDetDA = new SqlDataAdapter(
  "SELECT OrderID, ProductID, Quantity FROM [Order Details]", connection);

DataSet custDS = new DataSet();

// Open the Connection.
connection.Open();

    // Fill the DataSet with schema information and data.
    custDA.MissingSchemaAction = MissingSchemaAction.AddWithKey;
    orderDA.MissingSchemaAction = MissingSchemaAction.AddWithKey;
    ordDetDA.MissingSchemaAction = MissingSchemaAction.AddWithKey;

    custDA.Fill(custDS, "Customers");
    orderDA.Fill(custDS, "Orders");
    ordDetDA.Fill(custDS, "OrderDetails");

    // Close the Connection.
    connection.Close();

    // Create relationships.
    custDS.Relations.Add("CustomerOrders",
          custDS.Tables["Customers"].Columns["CustomerID"],
          custDS.Tables["Orders"].Columns["CustomerID"]);

    custDS.Relations.Add("OrderDetails",
          custDS.Tables["Orders"].Columns["OrderID"],
          custDS.Tables["OrderDetails"].Columns["OrderID"]);

// Create default DataView settings.
DataViewManager viewManager = new DataViewManager(custDS);

foreach (DataViewSetting viewSetting in viewManager.DataViewSettings)
  viewSetting.ApplyDefaultSort = true;

viewManager.DataViewSettings["Customers"].Sort = "CompanyName";

// Bind to a DataGrid.
System.Windows.Forms.DataGrid grid = new System.Windows.Forms.DataGrid();
grid.SetDataBinding(viewManager, "Customers");

請參閱

參考

DataSet

DataViewManager

DataViewSetting

DataViewSettingCollection

其他資源

DataView (ADO.NET)