FeatureSupport.GetVersionPresent 方法

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

public:
 abstract Version ^ GetVersionPresent(System::Object ^ feature);

public abstract Version GetVersionPresent(object feature);

public abstract Version? GetVersionPresent(object feature);

abstract member GetVersionPresent : obj -> Version

Public MustOverride Function GetVersionPresent (feature As Object) As Version

參數

傳回

A Version 代表系統上指定功能的版本號;或 null 是該功能未安裝。

實作

範例

以下程式碼範例使用 OSFeature 了該特性的 FeatureSupport 實作與查詢 LayeredWindows 。 會檢查該版本是否為 null，以判斷該特徵是否存在。 結果會顯示在文字框中。 此代碼要求已 textBox1 建立並放入表單。

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

備註

版本號分為三個部分：主版本、次要版本與組裝版本。 通常，版本號會顯示為「主要號.次要號.建號號」。

給實施者的注意事項

當你從 繼承 FeatureSupport時，必須覆蓋此方法。 當你覆寫這個方法時，檢查你用來做參數 feature 的類別，是否和方法中 IsPresent(String, String) 該參數的類別是同一類。 如果兩個 feature 參數不同，你也必須覆蓋 IsPresent(String, String)。

請參閱 GetVersionPresent(Object) 此方法的實作。

另請參閱

• GetVersionPresent(Object)

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

來源:

FeatureSupport.cs

public:
 static Version ^ GetVersionPresent(System::String ^ featureClassName, System::String ^ featureConstName);

public static Version GetVersionPresent(string featureClassName, string featureConstName);

public static Version? GetVersionPresent(string featureClassName, string featureConstName);

static member GetVersionPresent : string * string -> Version

Public Shared Function GetVersionPresent (featureClassName As String, featureConstName As String) As Version

參數

傳回

Version A，並標示系統上指定功能的版本號;或者null如果該功能尚未安裝。

備註

版本號分為三個部分：主版本、次要版本與組裝版本。 通常，版本號會顯示為「主要號.次要號.建號號」。

請參閱包含該功能的產品文件，以決定要傳遞給 和featureClassNamefeatureConstName參數的名稱。

另請參閱

• GetVersionPresent(Object)
• IsPresent(String, String)