Export (0) Print
Expand All

DataTableCollection.CollectionChanged Event

Occurs after the DataTableCollection is changed because of DataTable objects being added or removed.

Namespace:  System.Data
Assembly:  System.Data (in System.Data.dll)

public event CollectionChangeEventHandler CollectionChanged

For more information about handling events, see Consuming Events.

The following example demonstrates how to use the CollectionChanged event.

public static void TableCollectionCollectionChanged()
{
    // create a DataSet with two tables
    DataSet dataSet = new DataSet();

    dataSet.Tables.CollectionChanged +=
        new System.ComponentModel.CollectionChangeEventHandler(
        Collection_Changed);

    // create Customer table
    DataTable custTable = new DataTable("Customers");
    custTable.Columns.Add("customerId",
        typeof(int)).AutoIncrement = true;
    custTable.Columns.Add("name",
        typeof(string));
    custTable.PrimaryKey = new DataColumn[] { custTable.Columns["customerId"] };

    // create Orders table
    DataTable orderTable = new DataTable("Orders");
    orderTable.Columns.Add("orderId",
        typeof(int)).AutoIncrement = true;
    orderTable.Columns.Add("customerId", typeof(int));
    orderTable.Columns.Add("amount", typeof(double));
    orderTable.PrimaryKey = new DataColumn[] { orderTable.Columns["orderId"] };

    dataSet.Tables.AddRange(new DataTable[] { custTable, orderTable });

    // remove all tables 
    // check if table can be removed and then 
    // remove it, cannot use a foreach when 
    // removing items from a collection 
    // equivalent to dataSet.Tables.Clear() 
    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_Changed(object sender,
    System.ComponentModel.CollectionChangeEventArgs e)
{
    Console.WriteLine("Collection_Changed Event: '{0}'\table element={1}",
        e.Action.ToString(), e.Element.ToString());
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
Show:
© 2015 Microsoft