DataTable.ColumnChanged 이벤트
DataRow에 있는 지정된 DataColumn의 값이 변경된 후 발생합니다.
네임스페이스: System.Data
어셈블리: System.Data(system.data.dll)
구문
‘선언
Public Event ColumnChanged As DataColumnChangeEventHandler
‘사용 방법
Dim instance As DataTable
Dim handler As DataColumnChangeEventHandler
AddHandler instance.ColumnChanged, handler
public event DataColumnChangeEventHandler ColumnChanged
public:
event DataColumnChangeEventHandler^ ColumnChanged {
void add (DataColumnChangeEventHandler^ value);
void remove (DataColumnChangeEventHandler^ value);
}
/** @event */
public void add_ColumnChanged (DataColumnChangeEventHandler value)
/** @event */
public void remove_ColumnChanged (DataColumnChangeEventHandler value)
JScript에서는 이벤트를 사용할 수 있지만 새로 선언할 수는 없습니다.
설명
자세한 내용은 DataTable 이벤트 사용을 참조하십시오.
예제
Private Shared Sub DataTableColumnChanged()
Dim custTable As DataTable = New DataTable("Customers")
' add columns
custTable.Columns.Add("id", Type.GetType("System.Int32"))
custTable.Columns.Add("name", Type.GetType("System.String"))
custTable.Columns.Add("address", Type.GetType("System.String"))
' set PrimaryKey
custTable.Columns("id").Unique = true
custTable.PrimaryKey = New DataColumn() { custTable.Columns("id") }
' add a ColumnChanged event handler for the table.
AddHandler custTable.ColumnChanged, _
New DataColumnChangeEventHandler(AddressOf Column_Changed )
' add ten rows
Dim id As Integer
For id = 1 To 10
custTable.Rows.Add( _
New Object() { id, string.Format("customer{0}", id), _
string.Format("address{0}", id) })
Next
custTable.AcceptChanges()
' change the name column in all the rows
Dim row As DataRow
For Each row In custTable.Rows
row("name") = string.Format("vip{0}", row("id"))
Next
End Sub
Private Shared Sub Column_Changed(sender As Object, _
e As DataColumnChangeEventArgs)
Console.WriteLine("Column_Changed Event: name={0}; Column={1}; original name={2}", _
e.Row("name"), e.Column.ColumnName, e.Row("name", DataRowVersion.Original))
End Sub
private static void DataTableColumnChanged()
{
DataTable custTable = new DataTable("Customers");
// add columns
custTable.Columns.Add("id", typeof(int));
custTable.Columns.Add("name", typeof(string));
custTable.Columns.Add("address", typeof(string));
// set PrimaryKey
custTable.Columns["id"].Unique = true;
custTable.PrimaryKey = new DataColumn[] { custTable.Columns["id"] };
// add a ColumnChanged event handler for the table.
custTable.ColumnChanged += new
DataColumnChangeEventHandler(Column_Changed );
// add ten rows
for(int id=1; id<=10; id++)
{
custTable.Rows.Add(
new object[] { id, string.Format("customer{0}", id),
string.Format("address{0}", id) });
}
custTable.AcceptChanges();
// change the name column in all the rows
foreach(DataRow row in custTable.Rows )
{
row["name"] = string.Format("vip{0}", row["id"]);
}
}
private static void Column_Changed(object sender, DataColumnChangeEventArgs e )
{
Console.WriteLine("Column_Changed Event: name={0}; Column={1}; original name={2}",
e.Row["name"], e.Column.ColumnName, e.Row["name", DataRowVersion.Original]);
}
플랫폼
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework에서 모든 플래폼의 모든 버전을 지원하지는 않습니다. 지원되는 버전의 목록은 시스템 요구 사항을 참조하십시오.
버전 정보
.NET Framework
2.0, 1.1, 1.0에서 지원
.NET Compact Framework
2.0, 1.0에서 지원
참고 항목
참조
DataTable 클래스
DataTable 멤버
System.Data 네임스페이스