通过

IFeatureSupport 接口

  • 参考

定义

命名空间:
System.Windows.Forms
程序集:
System.Windows.Forms.dll

指定一个标准接口，用于从当前系统检索功能信息。

public interface class IFeatureSupport
public interface IFeatureSupport
type IFeatureSupport = interface
Public Interface IFeatureSupport
派生

示例

以下示例对功能使用 OSFeature 和 查询的LayeredWindows实现IFeatureSupport。 检查版本以查看它是否为 null，以确定是否存在该功能。 结果显示在文本框中。 此代码假定 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

在类中实现时， IFeatureSupport 提供可用于确定系统当前是否安装了功能以及获取功能版本号的方法。 调用 IsPresent 以确定当前是否安装了某个功能或特定版本的功能。 调用 GetVersionPresent 以确定已安装功能的版本号。

有关此接口的实现， FeatureSupport 请参阅 和 OSFeature 类。

方法

GetVersionPresent(Object)

检索指定功能的版本。
IsPresent(Object)

确定系统当前是否有指定功能的任意版本。
IsPresent(Object, Version)

确定系统当前是否有指定功能的指定版本或更新版本。

适用于

另请参阅