PowerStatus Class
TOC
Collapse the table of content
Expand the table of content

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)

public ref class 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.

#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.dll>

using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::Drawing;
using namespace System::Reflection;
using namespace System::Windows::Forms;

public ref class PowerStatusBrowserForm: public System::Windows::Forms::Form
{
private:
   System::Windows::Forms::ListBox^ listBox1;
   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::typeid;
      array<PropertyInfo^>^pi = t->GetProperties();
      for ( int i = 0; i < pi->Length; i++ )
         listBox1->Items->Add( pi[ i ]->Name );
      textBox1->Text = String::Format( "The PowerStatus class has {0} properties.\r\n", pi->Length );

      // Configure the list item selected handler for the list box to invoke a 
      // method that displays the value of each property.           
      listBox1->SelectedIndexChanged += gcnew EventHandler( this, &PowerStatusBrowserForm::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 = System::Windows::Forms::PowerStatus::typeid;
      array<PropertyInfo^>^pi = t->GetProperties();
      PropertyInfo^ prop = nullptr;
      for ( int i = 0; i < pi->Length; i++ )
         if ( pi[ i ]->Name == propname )
         {
            prop = pi[ i ];
            break;
         }

      Object^ propval = prop->GetValue( SystemInformation::PowerStatus, nullptr );
      textBox1->Text = String::Format( "{0}\r\nThe value of the {1} property is: {2}", textBox1->Text, propname, propval );
   }

   void InitForm()
   {
      // Initialize the form settings
      this->listBox1 = gcnew System::Windows::Forms::ListBox;
      this->textBox1 = gcnew 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 = System::Drawing::Point( 8, 16 );
      this->listBox1->Size = 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 = System::Drawing::Point( 188, 16 );
      this->textBox1->Multiline = true;
      this->textBox1->ScrollBars = System::Windows::Forms::ScrollBars::Vertical;
      this->textBox1->Size = System::Drawing::Size( 420, 496 );
      this->textBox1->TabIndex = 1;
      this->ClientSize = 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]
int main()
{
   Application::Run( gcnew 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

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

Community Additions

ADD
Show:
© 2016 Microsoft