DataTable.ColumnChanging Événement

  • Référence

Définition

Espace de noms:
System.Data
Assembly:
System.Data.Common.dll
Assembly:
System.Data.dll
Assembly:
netstandard.dll
Source:
DataTable.cs
Source:
DataTable.cs
Source:
DataTable.cs

Se produit lors de la modification d'une valeur du DataColumn spécifié dans un DataRow.

public:
 event System::Data::DataColumnChangeEventHandler ^ ColumnChanging;
public event System.Data.DataColumnChangeEventHandler? ColumnChanging;
public event System.Data.DataColumnChangeEventHandler ColumnChanging;
[System.Data.DataSysDescription("DataTableColumnChangingDescr")]
public event System.Data.DataColumnChangeEventHandler ColumnChanging;
member this.ColumnChanging : System.Data.DataColumnChangeEventHandler 
[<System.Data.DataSysDescription("DataTableColumnChangingDescr")>]
member this.ColumnChanging : System.Data.DataColumnChangeEventHandler 
Public Custom Event ColumnChanging As DataColumnChangeEventHandler

Type d'événement

DataColumnChangeEventHandler
Attributs
DataSysDescriptionAttribute

Exemples

private static void DataTableColumnChanging()
{
    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 ColumnChanging event handler for the table.
    custTable.ColumnChanging += new
        DataColumnChangeEventHandler(Column_Changing );

    // 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_Changing(object sender,
    DataColumnChangeEventArgs e )
{
    Console.WriteLine(
        "Column_Changing Event: name={0}; Column={1}; proposed name={2}",
        e.Row["name"], e.Column.ColumnName, e.ProposedValue );
}

Private Shared Sub DataTableColumnChanging()
    Dim custTable As 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 ColumnChanging event handler for the table.
    AddHandler custTable.ColumnChanging, New _
        DataColumnChangeEventHandler(AddressOf Column_Changing )

    ' 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_Changing(sender As Object, _
    e As DataColumnChangeEventArgs)
    Console.WriteLine( _
        "Column_Changing Event: name={0}; Column={1}; proposed name={2}", _
        e.Row("name"), e.Column.ColumnName, e.ProposedValue) 
End Sub

Remarques

Pour plus d’informations, consultez Gestion des événements DataTable.

S’applique à

Voir aussi