如何动态更新添加到Splash表单的自定义控件

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在这个例子中，一个自定义的进度条控件被添加到启动界面，该示例展示了如何通过从启动界面管理器发送命令来动态更新此进度条控件。启动界面由启动界面管理器在单独的线程中显示，与启动界面的交互可以通过命令机制执行，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界面来推进启动界面的进度条控件的进度。

注意：完整的示例项目位于。

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