SplashScreenManager.SendCommand(Enum, Object) Method

Sends a command to the currently active splash form.

Namespace: DevExpress.XtraSplashScreen

Assembly: DevExpress.XtraEditors.v18.2.dll

Declaration

C#

public void SendCommand(
    Enum cmd,
    object arg
)

VB.NET

Public Sub SendCommand(
    cmd As  Enum,
    arg As Object
)

Parameters

Name	Type	Description
cmd	Enum	An enumeration value that identifies the command to be sent to the currently active splash form.
arg	Object	The command’s parameter.

Remarks

A splash form is displayed in a separate thread. To interact with a splash form via code, you can send commands to it via the SendCommand method. To respond to the commands, override the SplashFormBase.ProcessCommand method for your splash form and implement the required functionality.

Example

In this example a custom Progress Bar Control is added to a Splash Screen. The example shows how to update this Progress Bar Control dynamically by sending commands from a Splash Screen Manager.Splash Screens are displayed by a Splash Screen Manager in a separate thread. Interaction with Splash Screens can be performed via the command mechanism. You send a command via the SplashScreenManager.SendCommand method and process this command by overriding the SplashScreen.ProcessCommand method. In the example, custom commands are sent to the Splash Screen to advance the progress of the Splash Screen's Progress Bar Control.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-interact-with-a-splash-screen-by-sending-commands-e3576

SplashScreen1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraSplashScreen;

namespace SplashScreen_ProcessCommand {
    public partial class SplashScreen1 : SplashScreen {
        public SplashScreen1() {
            InitializeComponent();
        }

        #region Overrides

        public override void ProcessCommand(Enum cmd, object arg) {
            base.ProcessCommand(cmd, arg);
            SplashScreenCommand command = (SplashScreenCommand)cmd;
            if (command == SplashScreenCommand.SetProgress) {
                int pos = (int)arg;
                progressBarControl1.Position = pos;
            }
        }

        #endregion

        public enum SplashScreenCommand {
            SetProgress,
            Command2,
            Command3
        }
    }
}

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraSplashScreen;
using System.Threading;


namespace SplashScreen_ProcessCommand {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void btnShowSplashScreen_Click(object sender, EventArgs e) {
            // Open a Splash Screen
            SplashScreenManager.ShowForm(this, typeof(SplashScreen1), true, true, false);

            // The splash screen will be opened in a separate thread. To interact with it, use the SendCommand method.
            for (int i = 1; i <= 100; i++) {
                SplashScreenManager.Default.SendCommand(SplashScreen1.SplashScreenCommand.SetProgress, i);
                //To process commands, override the SplashScreen.ProcessCommand method.
                Thread.Sleep(25);
            }

            // Close the Splash Screen.
            SplashScreenManager.CloseForm(false);
        }
    }
}

Form1.vb

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Linq
Imports System.Text
Imports System.Windows.Forms
Imports DevExpress.XtraSplashScreen
Imports System.Threading


Namespace SplashScreen_ProcessCommand
    Partial Public Class Form1
        Inherits Form
        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub btnShowSplashScreen_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnShowSplashScreen.Click
            ' Open a Splash Screen
            SplashScreenManager.ShowForm(Me, GetType(SplashScreen1), True, True, False)

            ' The splash screen will be opened in a separate thread. To interact with it, use the SendCommand method.
            For i As Integer = 1 To 100
                SplashScreenManager.Default.SendCommand(SplashScreen1.SplashScreenCommand.SetProgress, i)
                'To process commands, override the SplashScreen.ProcessCommand method.
                Thread.Sleep(25)
            Next i

            ' Close the Splash Screen.
            SplashScreenManager.CloseForm(False)
        End Sub
    End Class
End Namespace

SplashScreen1.vb

Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Text
Imports System.Windows.Forms
Imports DevExpress.XtraSplashScreen

Namespace SplashScreen_ProcessCommand
    Partial Public Class SplashScreen1
        Inherits SplashScreen
        Public Sub New()
            InitializeComponent()
        End Sub

        #Region "Overrides"

        Public Overrides Sub ProcessCommand(ByVal cmd As System.Enum, ByVal arg As Object)
            MyBase.ProcessCommand(cmd, arg)
            Dim command As SplashScreenCommand = CType(cmd, SplashScreenCommand)
            If command = SplashScreenCommand.SetProgress Then
                Dim pos As Integer = CInt(Fix(arg))
                progressBarControl1.Position = pos
            End If
        End Sub

        #End Region

        Public Enum SplashScreenCommand
            SetProgress
            Command2
            Command3
        End Enum
    End Class
End Namespace

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the SendCommand(Enum, Object) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

how-to-show-waitform-above-usercontrol-e3892/CS/WaitFormExample/WaitForm/WaitFormHelper.cs#L16

    manager.ShowWaitForm();
    manager.SendCommand(UserControlWaitFormCommand.SetSize, owner.Size);
}

how-to-cancel-time-consuming-operation-from-the-waitform-e4524/CS/WaitFormCanceling/Form1.cs#L78

    splashScreenManager1.ShowWaitForm();
    splashScreenManager1.SendCommand(WaitForm1.WaitFormCommand.SendObject, locker1);
}

how-to-interact-with-a-splash-screen-by-sending-commands-e3576/CS/Form1.cs#L25

for (int i = 1; i <= 100; i++) {
    SplashScreenManager.Default.SendCommand(SplashScreen1.SplashScreenCommand.SetProgress, i);
    //To process commands, override the SplashScreen.ProcessCommand method.

VB.NET

how-to-show-waitform-above-usercontrol-e3892/VB/WaitFormExample/WaitForm/WaitFormHelper.vb#L18

    manager.ShowWaitForm()
    manager.SendCommand(UserControlWaitFormCommand.SetSize, owner.Size)
End Sub

how-to-cancel-time-consuming-operation-from-the-waitform-e4524/VB/WaitFormCanceling/Form1.vb#L69

    splashScreenManager1.ShowWaitForm()
    splashScreenManager1.SendCommand(WaitForm1.WaitFormCommand.SendObject, locker1)
End Sub

how-to-interact-with-a-splash-screen-by-sending-commands-e3576/VB/Form1.vb#L22

For i As Integer = 1 To 100
    SplashScreenManager.Default.SendCommand(SplashScreen1.SplashScreenCommand.SetProgress, i)
    'To process commands, override the SplashScreen.ProcessCommand method.