FeatureSupport.GetVersionPresent 方法

Source:

FeatureSupport.cs

Source:

FeatureSupport.cs

Source:

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

参数

返回

Version，表示系统中可用的指定功能的版本号；如果未安装此功能，则为 null。

实现

示例

下面的代码示例使用 OSFeature 功能的 和 查询的LayeredWindows实现FeatureSupport。 检查版本以查看它是否为 null，以确定功能是否存在。 结果显示在文本框中。 此代码要求 textBox1 已创建并放置在窗体上。

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

注解

版本号由三个部分组成：主要、次要和内部版本。 通常，版本号显示为“major number.minor number.build number”。

实施者说明

从 FeatureSupport继承时，必须重写此方法。 重写此方法时，检查用于参数的feature类与方法中用于此参数的IsPresent(String, String)类相同。 如果两个 feature 参数不同，则还必须重写 IsPresent(String, String)。

有关此方法的实现，请参阅 GetVersionPresent(Object) 。

另请参阅

• GetVersionPresent(Object)

Source:

FeatureSupport.cs

Source:

FeatureSupport.cs

Source:

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

参数

返回

如果系统上有可用的指定功能的版本号，则为 Version；如果未安装该功能，则为 null。

注解

版本号由三个部分组成：主要、次要和内部版本。 通常，版本号显示为“major number.minor number.build number”。

请参阅包含该功能的产品的文档，以确定要传递给 featureClassName 和 featureConstName 参数的名称。

另请参阅

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