IFeatureSupport.IsPresent Metode

Definisi

Ruang nama:

System.Windows.Forms

Rakitan:

System.Windows.Forms.dll

Menentukan apakah fitur yang ditentukan saat ini tersedia pada sistem.

Overload

IsPresent(Object)	Menentukan apakah versi fitur yang ditentukan saat ini tersedia pada sistem.
IsPresent(Object, Version)	Menentukan apakah versi yang ditentukan atau yang lebih baru dari fitur yang ditentukan saat ini tersedia pada sistem.

IsPresent(Object)

Menentukan apakah versi fitur yang ditentukan saat ini tersedia pada sistem.

public:
 bool IsPresent(System::Object ^ feature);

public bool IsPresent (object feature);

abstract member IsPresent : obj -> bool

Public Function IsPresent (feature As Object) As Boolean

Parameter

feature

Object

Fitur yang harus dicari.

Mengembalikan

Boolean

true jika fitur tersebut ada; jika tidak, false.

Contoh

Contoh berikut menggunakan OSFeature implementasi IFeatureSupport dan kueri untuk fitur tersebut LayeredWindows . Versi diperiksa untuk melihat apakah itu null, untuk menentukan apakah fitur tersebut ada. Hasilnya ditampilkan dalam kotak teks. Kode ini mengasumsikan textBox1 telah dibuat dan ditempatkan pada formulir.

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

Lihat juga

• FeatureSupport
• OSFeature

IsPresent(Object, Version)

Menentukan apakah versi yang ditentukan atau yang lebih baru dari fitur yang ditentukan saat ini tersedia pada sistem.

public:
 bool IsPresent(System::Object ^ feature, Version ^ minimumVersion);

public bool IsPresent (object feature, Version minimumVersion);

abstract member IsPresent : obj * Version -> bool

Public Function IsPresent (feature As Object, minimumVersion As Version) As Boolean

Parameter

feature

Object

Fitur yang harus dicari.

minimumVersion

Version

yang Version mewakili nomor versi minimum fitur yang akan dicari.

Mengembalikan

Boolean

true jika versi fitur yang diminta ada; jika tidak, false.

Contoh

Contoh berikut menggunakan OSFeature implementasi IFeatureSupport dan kueri untuk fitur tersebut LayeredWindows . Versi diperiksa untuk melihat apakah itu null, untuk menentukan apakah fitur tersebut ada. Hasilnya ditampilkan dalam kotak teks. Kode ini mengasumsikan textBox1 telah dibuat dan ditempatkan pada formulir.

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

Lihat juga

• FeatureSupport
• OSFeature