SystemInformation Class
Provides information about the current system environment.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The SystemInformation class provides static properties that can be used to get information about the current system environment. The class provides access to information such as Windows display element sizes, operating system settings, network availability, and the capabilities of hardware installed on the system. This class cannot be instantiated.
For more information about system-wide parameters, see "SystemParametersInfo" in the Platform SDK documentation at http://msdn.microsoft.com.
The following code example lists all properties of the SystemInformation class in a ListBox and displays the current value of the property in a TextBox 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 SystemInfoBrowserForm 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 SystemInformation class to the list box. Dim t As Type = GetType(System.Windows.Forms.SystemInformation) 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 SystemInformation 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 list 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 If propname = "PowerStatus" Then ' Cycle and display the values of each property of the PowerStatus property. textBox1.Text += ControlChars.CrLf + "The value of the PowerStatus property is:" 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 Dim propval As Object = pi(i).GetValue(SystemInformation.PowerStatus, Nothing) textBox1.Text += ControlChars.CrLf + " PowerStatus." + pi(i).Name + " is: " + propval.ToString() Next i Else ' Display the value of the selected property of the SystemInformation type. Dim t As Type = GetType(System.Windows.Forms.SystemInformation) 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(Nothing, Nothing) textBox1.Text += ControlChars.CrLf + "The value of the " + propname + " property is: " + propval.ToString() End If 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 SystemInformation property to get the value of" End Sub <STAThread()> _ Shared Sub Main() Application.Run(New SystemInfoBrowserForm()) End Sub End Class
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.