DataSourceRemovedEventArgs.IsDataSourceInternal Property

Gets whether the data source is internal (loaded with the document template or added in the UI using the Data Source Wizard) or external (added manually or used in other parts of the application).

Namespace: DevExpress.Snap

Assembly: DevExpress.Snap.v21.2.Core.dll

NuGet Package: DevExpress.Snap.Core

Declaration

C#

public bool IsDataSourceInternal { get; }

VB.NET

Public ReadOnly Property IsDataSourceInternal As Boolean

Property Value

Type	Description
Boolean	true if the data source was loaded with the document template or added in the UI using the Data Source Wizard; otherwise, false.

Remarks

The IsDataSourceInternal property indicates whether the data source can be safely removed.

If the property returns true, the data source can be disposed of using the IDisposable.Dispose method. If false, additional examination is required.

The example below shows how to use this property to safely dispose of the data source.

Example

C#

public Form1()
{
  InitializeComponent();
  this.snapControl1.Document.DataSources.DataSourceRemoved += OnDataSourceRemoved;
}     


void OnDataSourceRemoved(object sender, DevExpress.Snap.DataSourceRemovedEventArgs e)
{
  if (e.IsDataSourceInternal)
    {
     IDisposable disposable = e.DataSourceInfo.DataSource as IDisposable;
     if (disposable != null) { disposable.Dispose(); }
    }
 }

VB.NET

Public Sub New()
  InitializeComponent()
  AddHandler Me.snapControl1.Document.DataSources.DataSourceRemoved, AddressOf OnDataSourceRemoved
End Sub


   Private Sub OnDataSourceRemoved(ByVal sender As Object, ByVal e As DevExpress.Snap.DataSourceRemovedEventArgs)
   If e.IsDataSourceInternal Then
    Dim disposable As IDisposable = TryCast(e.DataSourceInfo.DataSource, IDisposable)
      If disposable IsNot Nothing Then  disposable.Dispose()
      End If
     End If
 End Sub