ConsoleApplicationBase.CommandLineArgs Property


Gets a collection containing the command-line arguments as strings for the current application.

 property System::Collections::ObjectModel::ReadOnlyCollection<System::String ^> ^ CommandLineArgs { System::Collections::ObjectModel::ReadOnlyCollection<System::String ^> ^ get(); };
public System.Collections.ObjectModel.ReadOnlyCollection<string> CommandLineArgs { get; }
member this.CommandLineArgs : System.Collections.ObjectModel.ReadOnlyCollection<string>
Public ReadOnly Property CommandLineArgs As ReadOnlyCollection(Of String)

Property Value

A ReadOnlyCollection<T> of String, containing the command-line arguments as strings for the current application.


This example uses the My.Application.CommandLineArgs property to examine the application's command-line arguments. If an argument is found that starts with /input=, the rest of that argument is displayed.

Private Sub ParseCommandLineArgs()
    Dim inputArgument As String = "/input="
    Dim inputName As String = ""

    For Each s As String In My.Application.CommandLineArgs
        If s.ToLower.StartsWith(inputArgument) Then
            inputName = s.Remove(0, inputArgument.Length)
        End If

    If inputName = "" Then
        MsgBox("No input name")
        MsgBox("Input name: " & inputName)
    End If
End Sub


The My.Application.CommandLineArgs property provides read-only access to the current application's command-line arguments for applications that are not ClickOnce deployed.

For a single-instance application, the My.Application.CommandLineArgs property returns the command-line arguments for the first instance of an application. To access the arguments for subsequent attempts to start a single-instance application, you must handle the StartupNextInstance event and examine the CommandLine property of the StartupEventArgs argument.


The My.Application.CommandLineArgs property returns only the command-line arguments. This is different from the behavior of the CommandLine property, which returns the application name in addition to the arguments.


In an application that is ClickOnce deployed, use the ActivationUri property of the My.Application.Deployment object to get the command-line arguments. For more information, see Deployment.

The following table lists examples of tasks involving the My.Application.CommandLineArgs property.

To See
Check the command-line arguments of subsequent attempts to start a single-instance application StartupNextInstance

Availability by Project Type

Project type Available
Windows Application Yes
Class Library No
Console Application Yes
Windows Control Library No
Web Control Library No
Windows Service Yes
Web Site No

Applies to

See also