InstallContext Class
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Contains information about the current installation.
public ref class InstallContextpublic class InstallContexttype InstallContext = classPublic Class InstallContext- Inheritance
-
InstallContext
Examples
The following example demonstrates the InstallContext constructors, the Parameters property and the LogMessage and IsParameterTrue methods of the InstallContext class.
When the Install method of the installer is called, it checks for parameters from the command line. Depending on that, it displays the progress messages onto the console and also saves it to the specified log file.
When the program is invoked without any arguments, an empty InstallContext is created. When "/LogFile" and "/LogtoConsole" are specified, the InstallContext is created by passing the respective arguments to InstallContext.
#using <System.dll>
#using <System.Configuration.Install.dll>
using namespace System;
using namespace System::ComponentModel;
using namespace System::Configuration::Install;
using namespace System::Collections;
using namespace System::Collections::Specialized;
[RunInstallerAttribute(true)]
ref class InstallContext_Example: public Installer
{
public:
InstallContext^ myInstallContext;
virtual void Install( IDictionary^ mySavedState ) override
{
StringDictionary^ myStringDictionary = myInstallContext->Parameters;
if ( myStringDictionary->Count == 0 )
{
Console::Write( "No parameters have been entered in the command line " );
Console::WriteLine( "hence, the install will take place in the silent mode" );
}
else
{
// Check whether the "LogtoConsole" parameter has been set.
if ( myInstallContext->IsParameterTrue( "LogtoConsole" ) )
{
// Display the message to the console and add it to the logfile.
myInstallContext->LogMessage( "The 'Install' method has been called" );
}
}
// The 'Install procedure should be added here.
}
virtual void Uninstall( IDictionary^ mySavedState ) override
{
// The 'Uninstall' procedure should be added here.
}
virtual void Rollback( IDictionary^ mySavedState ) override
{
if ( myInstallContext->IsParameterTrue( "LogtoConsole" ) )
{
myInstallContext->LogMessage( "The 'Rollback' method has been called" );
}
// The 'Rollback' procedure should be added here.
}
virtual void Commit( IDictionary^ mySavedState ) override
{
if ( myInstallContext->IsParameterTrue( "LogtoConsole" ) )
{
myInstallContext->LogMessage( "The 'Commit' method has been called" );
}
// The 'Commit' procedure should be added here.
}
};
int main()
{
array<String^>^args = Environment::GetCommandLineArgs();
InstallContext_Example^ myInstallObject = gcnew InstallContext_Example;
IDictionary^ mySavedState = gcnew Hashtable;
if ( args->Length < 2 )
{
// There are no command line arguments, create an empty 'InstallContext'.
myInstallObject->myInstallContext = gcnew InstallContext;
}
else
if ( (args->Length == 2) && (args[ 1 ]->Equals( "/?" )) )
{
// Display the 'Help' for this utility.
Console::WriteLine( "Specify the '/Logfile' and '/LogtoConsole' parameters" );
Console::WriteLine( "Example: " );
Console::WriteLine( "InstallContext_InstallContext.exe /LogFile=example.log /LogtoConsole=true" );
return 0;
}
else
{
// Create an InstallContext object with the given parameters.
array<String^>^commandLine = gcnew array<String^>(args->Length - 1);
for ( int i = 0; i < args->Length - 1; i++ )
{
commandLine[ i ] = args[ i + 1 ];
}
myInstallObject->myInstallContext = gcnew InstallContext( args[ 1 ],commandLine );
}
try
{
// Call the 'Install' method.
myInstallObject->Install( mySavedState );
// Call the 'Commit' method.
myInstallObject->Commit( mySavedState );
}
catch ( Exception^ )
{
// Call the 'Rollback' method.
myInstallObject->Rollback( mySavedState );
}
}
using System;
using System.ComponentModel;
using System.Configuration.Install;
using System.Collections;
using System.Collections.Specialized;
namespace MyInstallContextNamespace
{
[RunInstallerAttribute(true)]
class InstallContext_Example : Installer
{
public InstallContext myInstallContext;
public override void Install( IDictionary mySavedState )
{
base.Install( mySavedState );
StringDictionary myStringDictionary = myInstallContext.Parameters;
if( myStringDictionary.Count == 0 )
{
Console.WriteLine( "No parameters have been entered in the command line "
+"hence, the install will take place in the silent mode" );
}
else
{
// Check whether the "LogtoConsole" parameter has been set.
if( myInstallContext.IsParameterTrue( "LogtoConsole" ) == true )
{
// Display the message to the console and add it to the logfile.
myInstallContext.LogMessage( "The 'Install' method has been called" );
}
}
// The 'Install procedure should be added here.
}
public override void Uninstall( IDictionary mySavedState )
{
base.Uninstall( mySavedState );
// The 'Uninstall' procedure should be added here.
}
public override void Rollback( IDictionary mySavedState )
{
base.Rollback( mySavedState );
if( myInstallContext.IsParameterTrue( "LogtoConsole" ) == true )
{
myInstallContext.LogMessage( "The 'Rollback' method has been called" );
}
// The 'Rollback' procedure should be added here.
}
public override void Commit( IDictionary mySavedState )
{
base.Commit( mySavedState );
if( myInstallContext.IsParameterTrue( "LogtoConsole" ) == true )
{
myInstallContext.LogMessage( "The 'Commit' method has been called" );
}
// The 'Commit' procedure should be added here.
}
static void Main( string[] args )
{
InstallContext_Example myInstallObject = new InstallContext_Example();
IDictionary mySavedState = new Hashtable();
if( args.Length < 1 )
{
// There are no command line arguments, create an empty 'InstallContext'.
myInstallObject.myInstallContext = new InstallContext();
}
else if( ( args.Length == 1 ) && ( args[ 0 ] == "/?" ) )
{
// Display the 'Help' for this utility.
Console.WriteLine( "Specify the '/Logfile' and '/LogtoConsole' parameters" );
Console.WriteLine( "Example: " );
Console.WriteLine( "InstallContext_InstallContext.exe /LogFile=example.log"
+" /LogtoConsole=true" );
return;
}
else
{
// Create an InstallContext object with the given parameters.
String[] commandLine = new string[ args.Length ];
for( int i = 0; i < args.Length; i++ )
{
commandLine[ i ] = args[ i ];
}
myInstallObject.myInstallContext = new InstallContext( args[ 0 ], commandLine);
}
try
{
// Call the 'Install' method.
myInstallObject.Install( mySavedState );
// Call the 'Commit' method.
myInstallObject.Commit( mySavedState );
}
catch( Exception )
{
// Call the 'Rollback' method.
myInstallObject.Rollback( mySavedState );
}
}
}
}
Imports System.ComponentModel
Imports System.Configuration.Install
Imports System.Collections
Imports System.Collections.Specialized
Namespace MyInstallContextNamespace
<RunInstallerAttribute(True)> Class InstallContext_Example
Inherits Installer
Public myInstallContext As InstallContext
Public Overrides Sub Install(mySavedState As IDictionary)
Dim myStringDictionary As StringDictionary = myInstallContext.Parameters
If myStringDictionary.Count = 0 Then
Console.WriteLine("No parameters have been entered in the command line" + _
"hence, the install will take place in the silent mode")
Else
' Check wether the "LogtoConsole" parameter has been set.
If myInstallContext.IsParameterTrue("LogtoConsole") = True Then
' Display the message to the console and add it to the logfile.
myInstallContext.LogMessage("The 'Install' method has been called")
End If
End If
' The 'Install procedure should be added here.
End Sub
Public Overrides Sub Uninstall(mySavedState As IDictionary)
' The 'Uninstall' procedure should be added here.
End Sub
Public Overrides Sub Rollback(mySavedState As IDictionary)
If myInstallContext.IsParameterTrue("LogtoConsole") = True Then
myInstallContext.LogMessage("The 'Rollback' method has been called")
End If
' The 'Rollback' procedure should be added here.
End Sub
Public Overrides Sub Commit(mySavedState As IDictionary)
If myInstallContext.IsParameterTrue("LogtoConsole") = True Then
myInstallContext.LogMessage("The 'Commit' method has been called")
End If
' The 'Commit' procedure should be added here.
End Sub
' Entry point which delegates to C-style main Private Function
Public Overloads Shared Sub Main()
Main(System.Environment.GetCommandLineArgs())
End Sub
Overloads Shared Sub Main(args() As String)
Dim myInstallObject As New InstallContext_Example()
Dim mySavedState = New Hashtable()
If args.Length < 2 Then
' There are no command line arguments, create an empty 'InstallContext'.
myInstallObject.myInstallContext = New InstallContext()
ElseIf args.Length = 2 And args(1) = "/?" Then
' Display the 'Help' for this utility.
Console.WriteLine("Specify the '/Logfile' and '/LogtoConsole' parameters")
Console.WriteLine("Example: ")
Console.WriteLine("InstallContext_InstallContext.exe /LogFile=example.log" + _
" /LogtoConsole=true")
Return
Else
' Create an InstallContext object with the given parameters.
Dim commandLine() As String = New String(args.Length - 2) {}
Dim i As Integer
For i = 1 To args.Length - 1
commandLine(i-1) = args(i)
Next i
myInstallObject.myInstallContext = _
New InstallContext("/LogFile:example.log", commandLine)
End If
Try
' Call the 'Install' method.
myInstallObject.Install(mySavedState)
' Call the 'Commit' method.
myInstallObject.Commit(mySavedState)
Catch
' Call the 'Rollback' method.
myInstallObject.Rollback( mySavedState )
End Try
End Sub
End Class
End Namespace 'MyInstallContextNamespace
Remarks
Typically, an InstallContext is created by an installation executable, such as InstallUtil.exe, that installs assemblies. The installation program invokes the InstallContext constructor, passing it the default log-file path and command-line parameters.
Prior to calling its Install, Commit, Rollback, or Uninstall methods, the installation program sets the Context property of an Installer to the instance of InstallContext. Before calling these methods, an Installer that contains an installer collection in the Installers property sets the Context property of each contained installer.
The Parameters property contains a parsed version of the command line that is entered to run the installation executable. The property contains information such as the path to a log file, whether to display log information on the console, and whether to show a user interface during the installation. Call the IsParameterTrue method to find out whether a command-line parameter is true.
Use the LogMessage method to write status messages to the installation log file and the console.
Constructors
| InstallContext() |
Initializes a new instance of the InstallContext class. |
| InstallContext(String, String[]) |
Initializes a new instance of the InstallContext class, and creates a log file for the installation. |
Properties
| Parameters |
Gets the command-line parameters that were entered when InstallUtil.exe was run. |
Methods
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetHashCode() |
Serves as the default hash function. (Inherited from Object) |
| GetType() |
Gets the Type of the current instance. (Inherited from Object) |
| IsParameterTrue(String) |
Determines whether the specified command-line parameter is |
| LogMessage(String) |
Writes a message to the console and to the log file for the installation. |
| MemberwiseClone() |
Creates a shallow copy of the current Object. (Inherited from Object) |
| ParseCommandLine(String[]) |
Parses the command-line parameters into a string dictionary. |
| ToString() |
Returns a string that represents the current object. (Inherited from Object) |
