PowerStatus 类

参考

定义

命名空间:: System.Windows.Forms

程序集:: System.Windows.Forms.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

指示当前的系统电源状态信息。

public ref class PowerStatus

public class PowerStatus

type PowerStatus = class

Public Class PowerStatus

继承: Object
PowerStatus

示例

以下示例列出控件中 ListBox 类的所有属性PowerStatus，并在选定列表项时显示控件中TextBox关联属性的当前值。

#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.dll>

using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::Drawing;
using namespace System::Reflection;
using namespace System::Windows::Forms;

public ref class PowerStatusBrowserForm: public System::Windows::Forms::Form
{
private:
   System::Windows::Forms::ListBox^ listBox1;
   System::Windows::Forms::TextBox^ textBox1;

public:
   PowerStatusBrowserForm()
   {
      this->SuspendLayout();
      InitForm();

      //Add each property of the PowerStatus class to the list box.
      Type^ t = System::Windows::Forms::PowerStatus::typeid;
      array<PropertyInfo^>^pi = t->GetProperties();
      for ( int i = 0; i < pi->Length; i++ )
         listBox1->Items->Add( pi[ i ]->Name );
      textBox1->Text = String::Format( "The PowerStatus class has {0} properties.\r\n", pi->Length );

      // Configure the list item selected handler for the list box to invoke a 
      // method that displays the value of each property.           
      listBox1->SelectedIndexChanged += gcnew EventHandler( this, &PowerStatusBrowserForm::listBox1_SelectedIndexChanged );
      this->ResumeLayout( false );
   }

private:
   void listBox1_SelectedIndexChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
   {
      // Return if no item is selected.
      if ( listBox1->SelectedIndex == -1 )
            return;

      // Get the property name from the list item
      String^ propname = listBox1->Text;

      // Display the value of the selected property of the PowerStatus type.
      Type^ t = System::Windows::Forms::PowerStatus::typeid;
      array<PropertyInfo^>^pi = t->GetProperties();
      PropertyInfo^ prop = nullptr;
      for ( int i = 0; i < pi->Length; i++ )
         if ( pi[ i ]->Name == propname )
         {
            prop = pi[ i ];
            break;
         }

      Object^ propval = prop->GetValue( SystemInformation::PowerStatus, nullptr );
      textBox1->Text = String::Format( "{0}\r\nThe value of the {1} property is: {2}", textBox1->Text, propname, propval );
   }

   void InitForm()
   {
      // Initialize the form settings
      this->listBox1 = gcnew System::Windows::Forms::ListBox;
      this->textBox1 = gcnew System::Windows::Forms::TextBox;
      this->listBox1->Anchor = (System::Windows::Forms::AnchorStyles)(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom | System::Windows::Forms::AnchorStyles::Left | System::Windows::Forms::AnchorStyles::Right);
      this->listBox1->Location = System::Drawing::Point( 8, 16 );
      this->listBox1->Size = System::Drawing::Size( 172, 496 );
      this->listBox1->TabIndex = 0;
      this->textBox1->Anchor = (System::Windows::Forms::AnchorStyles)(System::Windows::Forms::AnchorStyles::Top | System::Windows::Forms::AnchorStyles::Bottom | System::Windows::Forms::AnchorStyles::Right);
      this->textBox1->Location = System::Drawing::Point( 188, 16 );
      this->textBox1->Multiline = true;
      this->textBox1->ScrollBars = System::Windows::Forms::ScrollBars::Vertical;
      this->textBox1->Size = System::Drawing::Size( 420, 496 );
      this->textBox1->TabIndex = 1;
      this->ClientSize = System::Drawing::Size( 616, 525 );
      this->Controls->Add( this->textBox1 );
      this->Controls->Add( this->listBox1 );
      this->Text = "Select a PowerStatus property to get the value of";
   }
};

[STAThread]
int main()
{
   Application::Run( gcnew PowerStatusBrowserForm );
}

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;

namespace PowerStatusBrowser
{
    public class PowerStatusBrowserForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.TextBox textBox1;        
        
        public PowerStatusBrowserForm()
        {
            this.SuspendLayout();
            InitForm();
            
            //Add each property of the PowerStatus class to the list box.
            Type t = typeof(System.Windows.Forms.PowerStatus);            
            PropertyInfo[] pi = t.GetProperties();            
            for( int i=0; i<pi.Length; i++ )
                listBox1.Items.Add( pi[i].Name );            
            textBox1.Text = "The PowerStatus class has "+pi.Length.ToString()+" properties.\r\n";

            // Configure the list item selected handler for the list box to invoke a 
            // method that displays the value of each property.           
            listBox1.SelectedIndexChanged += new EventHandler(listBox1_SelectedIndexChanged);
            this.ResumeLayout(false);
        }
        
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            // Return if no item is selected.
            if( listBox1.SelectedIndex == -1 ) return;
            // Get the property name from the list item
            string propname = listBox1.Text;
            
            // Display the value of the selected property of the PowerStatus type.
            Type t = typeof(System.Windows.Forms.PowerStatus);
            PropertyInfo[] pi = t.GetProperties();            
            PropertyInfo prop = null;
            for( int i=0; i<pi.Length; i++ )
                if( pi[i].Name == propname )
                {
                    prop = pi[i];
                    break;           
                }

            object propval = prop.GetValue(SystemInformation.PowerStatus, null);            
            textBox1.Text += "\r\nThe value of the "+propname+" property is: "+propval.ToString();
        }

        private void InitForm()
        {
            // Initialize the form settings
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.textBox1 = new System.Windows.Forms.TextBox();            
            this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right)));
            this.listBox1.Location = new System.Drawing.Point(8, 16);
            this.listBox1.Size = new System.Drawing.Size(172, 496);
            this.listBox1.TabIndex = 0;            
            this.textBox1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
                | System.Windows.Forms.AnchorStyles.Right)));
            this.textBox1.Location = new System.Drawing.Point(188, 16);
            this.textBox1.Multiline = true;
            this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical;           
            this.textBox1.Size = new System.Drawing.Size(420, 496);
            this.textBox1.TabIndex = 1;            
            this.ClientSize = new System.Drawing.Size(616, 525);            
            this.Controls.Add(this.textBox1);
            this.Controls.Add(this.listBox1);            
            this.Text = "Select a PowerStatus property to get the value of";                   
        }

        [STAThread]
        static void Main() 
        {
            Application.Run(new PowerStatusBrowserForm());
        }
    }
}

Imports System.Collections
Imports System.ComponentModel
Imports System.Drawing
Imports System.Reflection
Imports System.Windows.Forms

Public Class PowerStatusBrowserForm
    Inherits System.Windows.Forms.Form
    Private listBox1 As System.Windows.Forms.ListBox
    Private textBox1 As System.Windows.Forms.TextBox  
    
    Public Sub New()
        Me.SuspendLayout()
        InitForm()
        
        'Add each property of the PowerStatus class to the list box.
        Dim t As Type = GetType(System.Windows.Forms.PowerStatus)
        Dim pi As PropertyInfo() = t.GetProperties()
        Dim i As Integer
        For i = 0 To pi.Length - 1
            listBox1.Items.Add(pi(i).Name)
        Next i
        textBox1.Text = "The PowerStatus class has " + pi.Length.ToString() + " properties." + ControlChars.CrLf
        
        ' Configure the list item selected handler for the list box to invoke a 
        ' method that displays the value of each property.           
        AddHandler listBox1.SelectedIndexChanged, AddressOf listBox1_SelectedIndexChanged
        Me.ResumeLayout(False)
    End Sub
        
    Private Sub listBox1_SelectedIndexChanged(sender As Object, e As EventArgs)
        ' Return if no item is selected.
        If listBox1.SelectedIndex = - 1 Then
            Return
        End If 
        ' Get the property name from the list item
        Dim propname As String = listBox1.Text
        
        ' Display the value of the selected property of the PowerStatus type.
        Dim t As Type = GetType(System.Windows.Forms.PowerStatus)
        Dim pi As PropertyInfo() = t.GetProperties()
        Dim prop As PropertyInfo = Nothing
        Dim i As Integer
        For i = 0 To pi.Length - 1
            If pi(i).Name = propname Then
                prop = pi(i)
                Exit For
            End If
        Next i 
        Dim propval As Object = prop.GetValue(SystemInformation.PowerStatus, Nothing)
        textBox1.Text += ControlChars.CrLf + "The value of the " + propname + " property is: " + propval.ToString()
    End Sub
    
    Private Sub InitForm()
        ' Initialize the form settings
        Me.listBox1 = New System.Windows.Forms.ListBox()
        Me.textBox1 = New System.Windows.Forms.TextBox()
        Me.listBox1.Anchor = CType(System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Left Or System.Windows.Forms.AnchorStyles.Right, System.Windows.Forms.AnchorStyles)
        Me.listBox1.Location = New System.Drawing.Point(8, 16)
        Me.listBox1.Size = New System.Drawing.Size(172, 496)
        Me.listBox1.TabIndex = 0
        Me.textBox1.Anchor = CType(System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom Or System.Windows.Forms.AnchorStyles.Right, System.Windows.Forms.AnchorStyles)
        Me.textBox1.Location = New System.Drawing.Point(188, 16)
        Me.textBox1.Multiline = True
        Me.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Vertical
        Me.textBox1.Size = New System.Drawing.Size(420, 496)
        Me.textBox1.TabIndex = 1
        Me.ClientSize = New System.Drawing.Size(616, 525)
        Me.Controls.Add(Me.textBox1)
        Me.Controls.Add(Me.listBox1)
        Me.Text = "Select a PowerStatus property to get the value of"
    End Sub    
    
    <STAThread()>  _
    Shared Sub Main()
        Application.Run(New PowerStatusBrowserForm())
    End Sub

End Class

注解

类 PowerStatus 表示有关当前交流线路电源状态、电池充电状态和电池充电状态的信息。

类的 SystemInformation 属性使用PowerStatus此类来指示当前系统电源信息。

属性

BatteryChargeStatus	获取当前的电池电量状态。
BatteryFullLifetime	获取报告的主电池电源的完全充电寿命（以秒为单位）。
BatteryLifePercent	获取电池剩余电量的近似量。
BatteryLifeRemaining	获取电池的剩余使用时间的近似秒数。
PowerLineStatus	获取当前的系统电源状态。

方法

Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回表示当前对象的字符串。 (继承自 Object)

适用于

通过

PowerStatus 类

定义

示例

注解

属性

方法

适用于

另请参阅

其他资源