DataSourceView.CanUpdate Property
Definition
Important
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Gets a value indicating whether the DataSourceView object associated with the current DataSourceControl object supports the ExecuteUpdate(IDictionary, IDictionary, IDictionary) operation.
public:
virtual property bool CanUpdate { bool get(); };public virtual bool CanUpdate { get; }member this.CanUpdate : boolPublic Overridable ReadOnly Property CanUpdate As BooleanProperty Value
true if the operation is supported; otherwise, false. The default implementation returns false.
Examples
The following code example demonstrates how to override the CanUpdate property and the ExecuteUpdate method in a class that extends the DataSourceView class. This code example is part of a larger example provided for the DataSourceView class.
// The CsvDataSourceView does not currently
// permit update operations. You can modify or
// extend this sample to do so.
public override bool CanUpdate {
get {
return false;
}
}
protected override int ExecuteUpdate(IDictionary keys, IDictionary values, IDictionary oldValues)
{
throw new NotSupportedException();
}
' The CsvDataSourceView does not currently
' permit update operations. You can modify or
' extend this sample to do so.
Public Overrides ReadOnly Property CanUpdate() As Boolean
Get
Return False
End Get
End Property
Protected Overrides Function ExecuteUpdate(keys As IDictionary, _
values As IDictionary, _
oldValues As IDictionary) As Integer
Throw New NotSupportedException()
End Function 'ExecuteUpdate
End Class
Remarks
The CanUpdate property reflects not only a capability of the data source control, but also whether it is currently appropriate to perform an operation. For example, even though a data-bound control supports the ExecuteUpdate operation, if a required update command or some other data is not set, the CanUpdate property returns false, as an update operation would fail.
