PowerStatus Class


Indicates current system power status information.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)


Public Class PowerStatus


Gets the current battery charge status.


Gets the reported full charge lifetime of the primary battery power source in seconds.


Gets the approximate amount of full battery charge remaining.


Gets the approximate number of seconds of battery time remaining.


Gets the current system power status.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

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()

        '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
        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
    End Sub

    Private Sub listBox1_SelectedIndexChanged(sender As Object, e As EventArgs)
        ' Return if no item is selected.
        If listBox1.SelectedIndex = - 1 Then
        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.Text = "Select a PowerStatus property to get the value of"
    End Sub    

    <STAThread()>  _
    Shared Sub Main()
        Application.Run(New PowerStatusBrowserForm())
    End Sub

End Class

.NET Framework
Available since 2.0

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

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