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如何：在 Windows Forms 中以非同步方式載入音效

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下列程式碼範例會以非同步方式從 URL 載入音效，然後在新的執行緒上播放。

範例

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Media;
using System.Windows.Forms;

namespace SoundPlayerLoadAsyncExample
{
    public class Form1 : Form
    {
        private SoundPlayer Player = new SoundPlayer();

        public Form1()
        {
            InitializeComponent();

            this.Player.LoadCompleted += new AsyncCompletedEventHandler(Player_LoadCompleted);
        }

        private void playSoundButton_Click(object sender, EventArgs e)
        {
            this.LoadAsyncSound();
        }

        public void LoadAsyncSound()
        {
            try
            {
                // Replace this file name with a valid file name.
                this.Player.SoundLocation = "http://www.tailspintoys.com/sounds/stop.wav";
                this.Player.LoadAsync();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error loading sound");
            }
        }

        // This is the event handler for the LoadCompleted event.
        void Player_LoadCompleted(object sender, AsyncCompletedEventArgs e)
        {
            if (Player.IsLoadCompleted)
            {
                try
                {
                    this.Player.Play();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "Error playing sound");
                }
            }
        }

        private Button playSoundButton;

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.playSoundButton = new System.Windows.Forms.Button();
            this.SuspendLayout();
            //
            // playSoundButton
            //
            this.playSoundButton.Location = new System.Drawing.Point(106, 112);
            this.playSoundButton.Name = "playSoundButton";
            this.playSoundButton.Size = new System.Drawing.Size(75, 23);
            this.playSoundButton.TabIndex = 0;
            this.playSoundButton.Text = "Play Sound";
            this.playSoundButton.Click += new System.EventHandler(this.playSoundButton_Click);
            //
            // Form1
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 273);
            this.Controls.Add(this.playSoundButton);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);
        }

        #endregion

    }

    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }
    }
}

Imports System.Media
Imports System.Windows.Forms

Public Class Form1
    Inherits System.Windows.Forms.Form

    Friend WithEvents playSoundButton As System.Windows.Forms.Button
    Private WithEvents Player As New SoundPlayer

    Sub New()

        Me.InitializeComponent()

    End Sub

    Private Sub playSoundButton_Click( _
        ByVal sender As System.Object, _
        ByVal e As System.EventArgs) _
        Handles playSoundButton.Click

        ' Replace this file name with a valid file name.
        Me.Player.SoundLocation = "http://www.tailspintoys.com/sounds/stop.wav"
        Me.Player.LoadAsync()

    End Sub

    Private Sub Player_LoadCompleted( _
        ByVal sender As Object, _
        ByVal e As _
        System.ComponentModel.AsyncCompletedEventArgs) _
        Handles Player.LoadCompleted

        If Me.Player.IsLoadCompleted Then
            Me.Player.Play()
        End If

    End Sub

    'Form overrides dispose to clean up the component list.
    <System.Diagnostics.DebuggerNonUserCode()> _
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing AndAlso components IsNot Nothing Then
            components.Dispose()
        End If
        MyBase.Dispose(disposing)
    End Sub

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.IContainer

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> _
    Private Sub InitializeComponent()
        Me.playSoundButton = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'playSoundButton
        '
        Me.playSoundButton.Location = New System.Drawing.Point(105, 107)
        Me.playSoundButton.Name = "playSoundButton"
        Me.playSoundButton.Size = New System.Drawing.Size(75, 23)
        Me.playSoundButton.TabIndex = 0
        Me.playSoundButton.Text = "Play Sound"
        Me.playSoundButton.UseVisualStyleBackColor = True
        '
        'Form1
        '
        Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
        Me.ClientSize = New System.Drawing.Size(292, 273)
        Me.Controls.Add(Me.playSoundButton)
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

    <STAThread()> _
    Shared Sub Main()
        Application.EnableVisualStyles()
        Application.Run(New Form1())
    End Sub

End Class

編譯程式碼

這個範例需要：

  • 本系統和 System.Windows.Forms 組件的參考。

  • 您將檔案名稱 "http://www.tailspintoys.com/sounds/stop.wav" 取代為有效的檔案名稱。

穩固程式設計

檔案作業應含括在適當的例外狀況處理區塊內。

以下條件可能會造成例外狀況：

.NET Framework 安全性

請勿根據檔案名稱來判斷檔案內容。 例如，Form1.vb 檔案可能不是 Visual Basic 來源檔案。 在應用程式中使用這些資料之前，請先驗證所有輸入值。

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