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管理 DataView

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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，例如瀏覽關聯性的方格，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 資料表的檢視設定。 在每個 DataSet 的資料表，DataViewSettingCollection 都包含一個 DataViewSetting 物件。 您可以利用參考資料表的 DataViewSetting，來預設 ApplyDefaultSort、Sort、RowFilter 與 RowStateFilter 屬性。 如需為特定資料表參考 DataViewSetting，可以透過名稱或序數參考，或將參考傳遞給該特定資料表物件。 您還可以使用 DataViewSetting 屬性來存取 DataViewManager 的 DataViewSettings 物件集合。

下列程式碼範例以 SQL Server Northwind 資料庫的 Customers、Orders 與 Order Details 資料表來填入 DataSet，在資料表間建立關聯性，使用 DataViewManager 設定預設 DataView 設定，並將 DataGrid 繫結至 DataViewManager。 如範例設定 DataSet 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");

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