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PowerStatus-Klasse

Aktualisiert: November 2007

Gibt Informationen über den aktuellen Systemenergiezustand an.

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

public class PowerStatus
public class PowerStatus
public class PowerStatus

Die PowerStatus-Klasse stellt Informationen über den aktuellen Zustand der Netzstromversorgung, der Akkuladung und und des Akkuladevorgangs dar.

Die PowerStatus-Eigenschaft der SystemInformation-Klasse gibt mithilfe dieser Klasse Informationen über den aktuellen Systemenergiezustand an.

Im folgenden Beispiel werden alle Eigenschaften der PowerStatus-Klasse in einem ListBox-Steuerelement aufgeführt, und bei der Auswahl eines Listenelements wird der aktuelle Wert der zugeordneten Eigenschaft in einem TextBox-Steuerelement angezeigt.

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());
        }
    }
}


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

Alle öffentlichen static (Shared in Visual Basic)-Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework und .NET Compact Framework unterstützen nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen für .NET Framework.

.NET Framework

Unterstützt in: 3.5, 3.0, 2.0

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