PowerStatus Class

Note: This class is new in the .NET Framework version 2.0.

Indicates current system power status information.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

'Declaration
Public Class PowerStatus
'Usage
Dim instance As PowerStatus

public class PowerStatus
public class PowerStatus

The PowerStatus class represents information about the current AC line power status, battery charging status, and battery charge status.

This class is used by the PowerStatus property of the SystemInformation class to indicate current system power information.

The following example lists all properties of the PowerStatus class in a ListBox control and displays the current value of the associated property in a TextBox control when a list item selected.

Imports Microsoft.VisualBasic
Imports System
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

package PowerStatusBrowser;

import System.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.Drawing.*;
import System.Reflection.*;
import System.Windows.Forms.*;

public class PowerStatusBrowserForm extends 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 = System.Windows.Forms.PowerStatus.class.ToType();
        PropertyInfo pi[] = t.GetProperties();
        for (int i = 0; i < pi.get_Length(); i++) {
            listBox1.get_Items().Add(pi[i].get_Name());
        }
        textBox1.set_Text("The PowerStatus class has " 
            + System.Convert.ToString(pi.get_Length()) + " 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.add_SelectedIndexChanged(
            new EventHandler(listBox1_SelectedIndexChanged));
        this.ResumeLayout(false);
    } //PowerStatusBrowserForm

    private void listBox1_SelectedIndexChanged(Object sender, EventArgs e)
    {
        // Return if no item is selected.
        if (listBox1.get_SelectedIndex() == -1) {
            return;
        }
        // Get the property name from the list item
        String propName = listBox1.get_Text();

        // Display the value of the selected property of the PowerStatus type.
        Type t = System.Windows.Forms.PowerStatus.class.ToType();
        PropertyInfo pi[] = t.GetProperties();
        PropertyInfo prop = null;
        for (int i = 0; i < pi.get_Length(); i++) {
            if (pi[i].get_Name().Equals(propName)) {
                prop = pi[i];
                break;
            }
        }

        Object propVal = prop.GetValue(SystemInformation.get_PowerStatus(),
            null);
        textBox1.set_Text(textBox1.get_Text() + "\r\nThe value of the " 
            + propName + " property is: " + propVal.ToString());
    } //listBox1_SelectedIndexChanged

    private void InitForm()
    {
        // Initialize the form settings
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.textBox1 = new System.Windows.Forms.TextBox();
        this.listBox1.set_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.set_Location(new System.Drawing.Point(8, 16));
        this.listBox1.set_Size(new System.Drawing.Size(172, 496));
        this.listBox1.set_TabIndex(0);
        this.textBox1.set_Anchor((System.Windows.Forms.AnchorStyles)(
            System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.
            AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right));
        this.textBox1.set_Location(new System.Drawing.Point(188, 16));
        this.textBox1.set_Multiline(true);
        this.textBox1.set_ScrollBars(System.Windows.Forms.ScrollBars.Vertical);
        this.textBox1.set_Size(new System.Drawing.Size(420, 496));
        this.textBox1.set_TabIndex(1);
        this.set_ClientSize(new System.Drawing.Size(616, 525));
        this.get_Controls().Add(this.textBox1);
        this.get_Controls().Add(this.listBox1);
        this.set_Text("Select a PowerStatus property to get the value of");
    } //InitForm

    /** @attribute STAThread()
     */
    public static void main(String[] args)
    {
        Application.Run(new PowerStatusBrowserForm());
    } //main
} //PowerStatusBrowserForm

System.Object
  System.Windows.Forms.PowerStatus

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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