IFeatureSupport.GetVersionPresent(Object) Metoda

  • Reference

Definice

Obor názvů:
System.Windows.Forms
Sestavení:
System.Windows.Forms.dll

Načte verzi zadané funkce.

public:
 Version ^ GetVersionPresent(System::Object ^ feature);
public Version GetVersionPresent (object feature);
public Version? GetVersionPresent (object feature);
abstract member GetVersionPresent : obj -> Version
Public Function GetVersionPresent (feature As Object) As Version

Parametry

feature
Object

Funkce, jejíž verze je požadována.

Návraty

Version

A Version představující číslo verze zadané funkce nebo null pokud funkce není nainstalovaná.

Příklady

Následující příklad používá implementaci OSFeatureIFeatureSupport a dotazů pro LayeredWindows funkci. Zkontroluje se, jestli je nullverze , aby se zjistilo, jestli je funkce k dispozici. Výsledek se zobrazí v textovém poli. Tento kód předpokládá, že textBox1 byl vytvořen a umístěn ve formuláři.

private:
   void LayeredWindows()
   {
      // Gets the version of the layered windows feature.
      Version^ myVersion = OSFeature::Feature->GetVersionPresent(
         OSFeature::LayeredWindows );
      
      // Prints whether the feature is available.
      if ( myVersion != nullptr )
      {
         textBox1->Text = "Layered windows feature is installed.\n";
      }
      else
      {
         textBox1->Text = "Layered windows feature is not installed.\n";
      }

      
      // This is an alternate way to check whether a feature is present.
      if ( OSFeature::Feature->IsPresent( OSFeature::LayeredWindows ) )
      {
         textBox1->Text = String::Concat( textBox1->Text,
            "Again, layered windows feature is installed." );
      }
      else
      {
         textBox1->Text = String::Concat( textBox1->Text,
            "Again, layered windows feature is not installed." );
      }
   }

private void LayeredWindows() {
   // Gets the version of the layered windows feature.
   Version myVersion = OSFeature.Feature.GetVersionPresent(OSFeature.LayeredWindows);

   // Prints whether the feature is available.
   if (myVersion != null)
      textBox1.Text = "Layered windows feature is installed." + '\n';
   else
      textBox1.Text = "Layered windows feature is not installed." + '\n';

   // This is an alternate way to check whether a feature is present.
   if (OSFeature.Feature.IsPresent(OSFeature.LayeredWindows))
      textBox1.Text += "Again, layered windows feature is installed.";
   else
      textBox1.Text += "Again, layered windows feature is not installed.";
}

Private Sub LayeredWindows()
    ' Gets the version of the layered windows feature.
    Dim myVersion As Version = _
       OSFeature.Feature.GetVersionPresent(OSFeature.LayeredWindows)
       
    ' Prints whether the feature is available.
    If (myVersion IsNot Nothing) Then
        textBox1.Text = "Layered windows feature is installed." & _
           ControlChars.CrLf
    Else
        textBox1.Text = "Layered windows feature is not installed." & _
           ControlChars.CrLf
    End If 
    'This is an alternate way to check whether a feature is present.
    If OSFeature.Feature.IsPresent(OSFeature.LayeredWindows) Then
        textBox1.Text &= "Again, layered windows feature is installed."
    Else
        textBox1.Text &= "Again, layered windows feature is not installed."
    End If
End Sub

Poznámky

Implementaci této metody najdete v tématu GetVersionPresent.

Platí pro

Viz také