Item(Int32) Property

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overloads ReadOnly Property Item( _
   ByVal index As Integer _
) As Device

'Usage
 
Dim instance As Devices
Dim index As Integer
Dim value As Device
 
value = instance.Item(index)

public Device Item( 
   int index
) {get;}

public:
property Device^ Item {
   Device^ get(int index);
}

Parameters

index: The zero-based index of the item to get.

Property Value

The Device item at the specified index.

Exception	Description
System.ArgumentOutOfRangeException	The exception that is thrown when the value of an argument is outside the allowable range of values as defined by the invoked method.

This property provides the ability to access a specific item in the collection by using the following syntax: myCollection[index] The C# language uses the this keyword to define the indexers instead of implementing the Item property. Visual Basic implements Item as a default property, which provides the same indexing functionality.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.MediaFoundation
Imports LeadtoolsMediaFoundationExamples.Fixtures

Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public Sub IndexContainsExample()
   ' reference the capture control
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

   Try
      ' select a video device, use your device name here instead of Analog
      If capturectrl.VideoDevices("Analog") Is Nothing Then
         Throw New Exception("No Analog video tuner device available")
      End If

      capturectrl.VideoDevices("Analog").Selected = True

      ' reference the video devices object
      Dim devices As Devices = capturectrl.VideoDevices

      ' check the index of a USB video device
      Dim i As Integer = devices.IndexOf("USB")

      Dim dev As Device = Nothing
      If i > -1 Then
         ' access the input via the collection indexer
         dev = devices(i)
      End If

      ' check if the collection contains this input 
      ' (it should we just got it with IndexOf above)
      If devices.Contains(dev) Then
         ' set the result to what we expect
         _result = True
      End If
   Catch e1 As Exception
      _result = False
   End Try
End Sub

using Leadtools;
using Leadtools.MediaFoundation;
using LeadtoolsMediaFoundationExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public void IndexContainsExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   try
   {
      // select a video device, use your device name here instead of Analog
      if (capturectrl.VideoDevices["Analog"] == null)
         throw new Exception("No Analog video tuner device available");

      capturectrl.VideoDevices["Analog"].Selected = true;

      // reference the video devices object
      Devices devices = capturectrl.VideoDevices;

      // check the index of a USB video device
      int i = devices.IndexOf("USB");

      Device dev = null;
      if (i > -1)
         // access the input via the collection indexer
         dev = devices[i];

      // check if the collection contains this input 
      // (it should we just got it with IndexOf above)
      if (devices.Contains(dev))
      {
         // set the result to what we expect
         _result = true;
      }
   }
   catch (Exception)
   {
      _result = false;
   }
}

Target Platforms

Reference

Devices Class
Devices Members
Overload List