本文整理汇总了C#中System.Data.ConstraintCollection.CollectionChanged事件的典型用法代码示例。如果您正苦于以下问题：C# ConstraintCollection.CollectionChanged事件的具体用法？C# ConstraintCollection.CollectionChanged怎么用？C# ConstraintCollection.CollectionChanged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.ConstraintCollection的用法示例。
在下文中一共展示了ConstraintCollection.CollectionChanged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: ConstraintCollectionChanged
private static void ConstraintCollectionChanged()
{
// Demonstrate ConstraintCollection.CollectionChanged event.
try
{
// Create Customers table.
DataTable customersTable = new DataTable("Customers");
customersTable.Columns.Add("id", typeof(int));
customersTable.Columns.Add("Name", typeof(string));
customersTable.Constraints.CollectionChanged +=
new System.ComponentModel.CollectionChangeEventHandler(
Collection_Changed);
// Create Orders table.
DataTable ordersTable = new DataTable("Orders");
ordersTable.Columns.Add("CustID", typeof(int));
ordersTable.Columns.Add("CustName", typeof(string));
ordersTable.Constraints.CollectionChanged +=
new System.ComponentModel.CollectionChangeEventHandler(
Collection_Changed);
// Create unique constraint.
UniqueConstraint constraint = new UniqueConstraint(
customersTable.Columns["id"]);
customersTable.Constraints.Add(constraint);
// Create unique constraint and specify as primary key.
ordersTable.Constraints.Add(
"pKey", ordersTable.Columns["CustID"], true);
// Remove constraints.
customersTable.Constraints.RemoveAt(0);
// Results in an Exception. You can't remove
// a primary key constraint.
ordersTable.Constraints.RemoveAt(0);
}
catch(Exception ex)
{
// Process exception and return.
Console.WriteLine("Exception of type {0} occurred.",
ex.GetType());
}
}
private static void Collection_Changed(object sender,
System.ComponentModel.CollectionChangeEventArgs ex)
{
Console.WriteLine("List_Changed Event: '{0}'\t element={1}",
ex.Action, ex.Element);
}