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在此示例中，自定义进度栏控件被添加到启动屏幕。 该示例显示如何通过从启动画面管理器发送命令来动态更新此进度栏控件。启动画面由启动画面管理器在单独的线程中显示，可以通过命令机制执行与启动画面的交互。 您通过SplashScreenManager.SendCommand方法发送命令，并通过覆盖SplashScreen.ProcessCommand方法来处理此命令。 在该示例中，自定义命令被发送到启动画面，以推进启动画面的进度条控件的进度。

注意：完整的示例项目位于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

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