SystemInformation.ComputerName プロパティとは？ わかりやすく解説

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SystemInformation.ComputerName プロパティ

ローカル コンピュータの NetBIOS コンピュータ名を取得します。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文構文

Visual Basic (宣言)
Public Shared ReadOnly Property
 ComputerName As String
Visual Basic (使用法)
Dim value As String

value = SystemInformation.ComputerName
C#
public static string ComputerName
 { get; }
C++
public:
static property String^ ComputerName {
    String^ get ();
}
J#
/** @property */
public static String get_ComputerName ()
JScript
public static function get
 ComputerName () : String

プロパティ値
コンピュータの名前。

解説解説

ComputerName プロパティは、ローカル コンピュータの NetBIOS 名を取得します。この名前は、システムの起動時、この値をシステムがレジストリから読み取る際に設定されます。ローカル コンピュータがクラスタ内のノードの場合、ComputerName は、クラスタ仮想サーバーの名前を返します。

ComputerName メソッドを使用して、ネットワーク上の他のユーザーに表示されるコンピュータの名前を確認できます。

使用例使用例

次のコード例では、SystemInformation クラスのすべてのプロパティを ListBox に一覧表示し、リスト項目が選択されると、TextBox に現在のプロパティ値を表示します。

Visual Basic
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
C#
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;

namespace SystemInfoBrowser
{
    public class SystemInfoBrowserForm : System.Windows.Forms.Form
    {
        private System.Windows.Forms.ListBox listBox1;
        private System.Windows.Forms.TextBox textBox1;       
 
        
        public SystemInfoBrowserForm()
        {
            this.SuspendLayout();
            InitForm();
            
            // Add each property of the SystemInformation class to the
 list box.
            Type t = typeof(System.Windows.Forms.SystemInformation);            
            PropertyInfo[] pi = t.GetProperties();            
            for( int i=0; i<pi.Length; i++
 )
                listBox1.Items.Add( pi[i].Name );            
            textBox1.Text = "The SystemInformation 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 list item is selected.
            if( listBox1.SelectedIndex == -1 ) return;
            // Get the property name from the list item.
            string propname = listBox1.Text;
            
            if( propname == "PowerStatus" )
            {
                // Cycle and display the values of each property of
 the PowerStatus property.
                textBox1.Text += "\r\nThe value of the PowerStatus property
 is:";                                
                Type t = typeof(System.Windows.Forms.PowerStatus);
                PropertyInfo[] pi = t.GetProperties();            
                for( int i=0; i<pi.Length; i++
 )
                {
                    object propval = pi[i].GetValue(SystemInformation.PowerStatus,
 null);            
                    textBox1.Text += "\r\n    PowerStatus."+pi[i].Name+"
 is: "+propval.ToString();
                }
            }
            else
            {
                // Display the value of the selected property of the
 SystemInformation type.
                Type t = typeof(System.Windows.Forms.SystemInformation);
                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(null, 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 SystemInformation property
 to get the value of";                   
        }

        [STAThread]
        static void Main() 
        {
            Application.Run(new SystemInfoBrowserForm());
        }
    }
}
C++
#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 SystemInfoBrowserForm: public
 System::Windows::Forms::Form
{
private:
   System::Windows::Forms::ListBox^ listBox1;
   System::Windows::Forms::TextBox^ textBox1;

public:
   SystemInfoBrowserForm()
   {
      this->SuspendLayout();
      InitForm();
      
      // Add each property of the SystemInformation class to the list
 box.
      Type^ t = System::Windows::Forms::SystemInformation::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 SystemInformation 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,
 &SystemInfoBrowserForm::listBox1_SelectedIndexChanged );
      this->ResumeLayout( false );
   }


private:
   void listBox1_SelectedIndexChanged( Object^ /*sender*/, EventArgs^
 /*e*/ )
   {
      
      // Return if no list item is selected.
      if ( listBox1->SelectedIndex == -1 )
            return;

      
      // Get the property name from the list item.
      String^ propname = listBox1->Text;
      if ( propname->Equals( "PowerStatus" ) )
      {
         
         // Cycle and display the values of each property of the PowerStatus
 property.
         textBox1->Text = String::Concat( textBox1->Text, "\r\nThe value
 of the PowerStatus property is:" );
         Type^ t = System::Windows::Forms::PowerStatus::typeid;
         array<PropertyInfo^>^pi = t->GetProperties();
         for ( int i = 0; i < pi->Length;
 i++ )
         {
            Object^ propval = pi[ i ]->GetValue( SystemInformation::PowerStatus,
 nullptr );
            textBox1->Text = String::Format( "{0}\r\n    PowerStatus.{1}
 is: {2}", textBox1->Text, pi[ i ]->Name, propval );

         }
      }
      else
      {
         
         // Display the value of the selected property of the SystemInformation
 type.
         Type^ t = System::Windows::Forms::SystemInformation::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( nullptr, 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 SystemInformation property
 to get the value of";
   }

};


[STAThread]
int main()
{
   Application::Run( gcnew SystemInfoBrowserForm );
}
J#
package SystemInfoBrowser;

import System.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.Drawing.*;
import System.Reflection.*;
import System.Windows.Forms.*;

public class SystemInfoBrowserForm extends
 System.Windows.Forms.Form
{
    private System.Windows.Forms.ListBox listBox1;
    private System.Windows.Forms.TextBox textBox1;

    public SystemInfoBrowserForm()
    {
        this.SuspendLayout();
        InitForm();
        // Add each property of the SystemInformation class to the list
 box.
        Type t = System.Windows.Forms.SystemInformation.class.ToType();
        PropertyInfo pi[] = t.GetProperties();
        for (int i = 0; i < pi.length; i++)
 {
            listBox1.get_Items().Add(pi[i].get_Name());
        }
        textBox1.set_Text("The SystemInformation class has
 "
            + ((Int32)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.add_SelectedIndexChanged(
            new EventHandler(listBox1_SelectedIndexChanged));
        this.ResumeLayout(false);
    } //SystemInfoBrowserForm

    private void listBox1_SelectedIndexChanged(Object
 sender, EventArgs e)
    {
        // Return if no list item is selected.
        if (listBox1.get_SelectedIndex() == -1) {
            return;
        }
        // Get the property name from the list item.
        String propname = listBox1.get_Text();

        if (propname.Equals("PowerStatus")) {
            // Cycle and display the values of each property of the
            // PowerStatus property.
            textBox1.set_Text(textBox1.get_Text()
                + "\r\nThe value of the PowerStatus property is:");
            Type t = System.Windows.Forms.PowerStatus.class.ToType();
            PropertyInfo pi[] = t.GetProperties();
            for (int i = 0; i < pi.length; i++)
 {
                Object propval = pi[i].GetValue(
                    SystemInformation.get_PowerStatus(), null);
                textBox1.set_Text(textBox1.get_Text()
                    + "\r\n    PowerStatus." + pi[i].get_Name()
                    + " is: " + propval.ToString());
            }
        }
        else {
            // Display the value of the selected property of the
            // SystemInformation type.
            Type t = System.Windows.Forms.SystemInformation.class.ToType();
            PropertyInfo pi[] = t.GetProperties();
            PropertyInfo prop = null;
            for (int i = 0; i < pi.length; i++)
 {
                if (pi[i].get_Name().Equals(propname)) {
                    prop = pi[i];
                    break;
                }
            }
            Object propval = prop.GetValue(null, 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 SystemInformation property
 to get the value of");
    } //InitForm

    /** @attribute STAThread()
     */
    public static void main(String[]
 args)
    {
        Application.Run(new SystemInfoBrowserForm());
    } //main
} //SystemInfoBrowserForm
.NET Framework のセキュリティ.NET Framework のセキュリティ
プラットフォームプラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報バージョン情報
.NET Framework
サポート対象 : 2.0、1.1、1.0
参照参照
関連項目
SystemInformation クラス
SystemInformation メンバ
System.Windows.Forms 名前空間
UserName

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「SystemInformation.ComputerName プロパティ」の関連用語

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