PowerStatus Class
Indicates current system power status information.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
| Name | Description | |
|---|---|---|
![]() | BatteryChargeStatus | Gets the current battery charge status. |
![]() | BatteryFullLifetime | Gets the reported full charge lifetime of the primary battery power source in seconds. |
![]() | BatteryLifePercent | Gets the approximate amount of full battery charge remaining. |
![]() | BatteryLifeRemaining | Gets the approximate number of seconds of battery time remaining. |
![]() | PowerLineStatus | Gets the current system power status. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | 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() 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
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.


