本文整理汇总了C#中System.Data.DataTableCollection.CollectionChanging事件的典型用法代码示例。如果您正苦于以下问题：C# DataTableCollection.CollectionChanging事件的具体用法？C# DataTableCollection.CollectionChanging怎么用？C# DataTableCollection.CollectionChanging使用的例子？那么, 这里精选的事件代码示例或许可以为您提供帮助。您也可以进一步了解该事件所在类System.Data.DataTableCollection的用法示例。
在下文中一共展示了DataTableCollection.CollectionChanging事件的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: TableCollectionCollectionChanging
public static void TableCollectionCollectionChanging()
{
// Create a DataSet with two tables
DataSet dataSet = new DataSet();
// Assign the event-handler function for the
// CollectionChangeEvent.
dataSet.Tables.CollectionChanging +=
new System.ComponentModel.CollectionChangeEventHandler(
Collection_Changing);
// create Customer table
DataTable customersTable = new DataTable("Customers");
customersTable.Columns.Add("customerId",
typeof(int)).AutoIncrement = true;
customersTable.Columns.Add("name",
typeof(string));
customersTable.PrimaryKey = new DataColumn[] { customersTable.Columns["customerId"] };
// create Orders table
DataTable ordersTable = new DataTable("Orders");
ordersTable.Columns.Add("orderId",
typeof(int)).AutoIncrement = true;
ordersTable.Columns.Add("customerId",
typeof(int));
ordersTable.Columns.Add("amount",
typeof(double));
ordersTable.PrimaryKey = new DataColumn[] { ordersTable.Columns["orderId"] };
dataSet.Tables.AddRange(new DataTable[] { customersTable, ordersTable });
// Check to see if each table can be removed and then
// remove it.
while (dataSet.Tables.Count > 0)
{
DataTable table = dataSet.Tables[0];
if (dataSet.Tables.CanRemove(table))
{
dataSet.Tables.RemoveAt(0);
}
}
Console.WriteLine("dataSet has {0} tables",
dataSet.Tables.Count);
}
private static void Collection_Changing(object sender,
System.ComponentModel.CollectionChangeEventArgs e)
{
// Implementing this event allows you to abort a change
// to the collection by raising an exception which you can
// catch.
Console.WriteLine("Collection_Changing Event: '{0}'\table element={1}",
e.Action.ToString(), e.Element.ToString());
}