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