稳扎稳打Silverlight(2) - 1.0实例之支持录音和回放的钢琴(Silverlight+ASP.NET AJAX+DLINQ)
作者：webabcd
介绍
用Silverlight 1.0实现一个可以用鼠标或键盘弹奏，并且支持录音和回放的钢琴。(Silverlight+ASP.NET AJAX+DLINQ)
参考：http://silverlight.net/community/communitygallery.aspx
示例
Piano.xaml（用Expression Blend开发）
<Canvas xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Name="Piano" Width="1024" Height="500"> <Image Source="Image/bg.jpg" Height="500" Width="1024"/> <Image x:Name="imgC" Height="500" Width="1024" Canvas.Top="0" Source="Image/C.jpg" Opacity="0"/> <Image x:Name="imgC2" Height="500" Width="1024" Canvas.Top="0" Source="Image/C2.jpg" Opacity="0"/> <Image x:Name="imgD" Height="500" Width="1024" Canvas.Top="0" Source="Image/D.jpg" Opacity="0"/> <Image x:Name="imgD2" Height="500" Width="1024" Canvas.Top="0" Source="Image/D2.jpg" Opacity="0"/> <Image x:Name="imgE" Height="500" Width="1024" Canvas.Top="0" Source="Image/E.jpg" Opacity="0"/> <Image x:Name="imgF" Height="500" Width="1024" Canvas.Top="0" Source="Image/F.jpg" Opacity="0"/> <Image x:Name="imgF2" Height="500" Width="1024" Canvas.Top="0" Source="Image/F2.jpg" Opacity="0"/> <Image x:Name="imgG" Height="500" Width="1024" Canvas.Top="0" Source="Image/G.jpg" Opacity="0"/> <Image x:Name="imgG2" Height="500" Width="1024" Canvas.Top="0" Source="Image/G2.jpg" Opacity="0"/> <Image x:Name="imgA" Height="500" Width="1024" Canvas.Top="0" Source="Image/A.jpg" Opacity="0"/> <Image x:Name="imgA2" Height="500" Width="1024" Canvas.Top="0" Source="Image/A2.jpg" Opacity="0"/> <Image x:Name="imgB" Height="500" Width="1024" Canvas.Top="0" Source="Image/B.jpg" Opacity="0"/> <MediaElement x:Name="C" AutoPlay="false" Source="Media/C.wma"/> <MediaElement x:Name="C2" AutoPlay="false" Source="Media/C2.wma"/> <MediaElement x:Name="D" AutoPlay="false" Source="Media/D.wma"/> <MediaElement x:Name="D2" AutoPlay="false" Source="Media/D2.wma"/> <MediaElement x:Name="E" AutoPlay="false" Source="Media/E.wma"/> <MediaElement x:Name="F" AutoPlay="false" Source="Media/F.wma"/> <MediaElement x:Name="F2" AutoPlay="false" Source="Media/F2.wma"/> <MediaElement x:Name="G" AutoPlay="false" Source="Media/G.wma"/> <MediaElement x:Name="G2" AutoPlay="false" Source="Media/G2.wma"/> <MediaElement x:Name="A" AutoPlay="false" Source="Media/A.wma"/> <MediaElement x:Name="A2" AutoPlay="false" Source="Media/A2.wma"/> <MediaElement x:Name="B" AutoPlay="false" Source="Media/B.wma"/> <Canvas x:Name="pathCanvas"> <Path x:Name="CPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="161.666656494141" Height="272.333312988281" Canvas.Left="135.5" Canvas.Top="138.83332824707" Data="M272.66667,140 L136,330 147.33333,336 162.66667,410.66667 247.33333,410 234.66667,330.66667 278,248 254,242.66667 258.66667,200.66667 296.66667,139.33333 272.66667,140" /> <Path x:Name="C2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="91" Height="136.333319306374" Canvas.Left="263.5" Canvas.Top="105.500005066396" Data="M325.33333,106.66667 L264,202.66667 266,241.33333 307.33333,238.66667 354,138 351.33333,106.66666 326.66667,106" /> <Path x:Name="DPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="131" Height="274.333297729492" Canvas.Left="247.499999999999" Canvas.Top="137.499984741212" Data="M358,142.66667 L311.33333,243.33333 288.66667,246 248,330.66667 258,338 266.66667,411.33333 354,410.66665 347.33333,330.66668 374,246.66668 350,243.33336 352.66667,202.66669 378,138.00005 360.66667,140.00005" /> <Path x:Name="D2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="70.3333129882813" Height="134.333319425583" Canvas.Left="356.83334350586" Canvas.Top="107.500003457069" Data="M394.66667,108.66667 L357.33333,204 359.33333,241.33333 398,240.66667 426.66667,134.66667 425.33333,108" /> <Path x:Name="EPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="117.666656494141" Height="274.333343505859" Canvas.Left="358.833343505859" Canvas.Top="137.5" Data="M431.33333,140 L403.33333,245.33333 381.33333,248 359.33333,330 368.66667,339.33333 372,411.33333 458,411.33333 455.33333,331.33333 476,138 433.33333,138.66667" /> <Path x:Name="FPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="99.6666564941406" Height="273.666680037975" Canvas.Left="470.83334350586" Canvas.Top="138.833345949649" Data="M486.66667,140.66667 L471.33333,332 477.33333,334 476.66667,412 563.33333,411.33335 564,339.33334 570,328 560,246.66665 535.33333,243.33331 530,139.3333 486.66667,139.33329" /> <Path x:Name="F2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="51" Height="133.666656494141" Canvas.Left="534.166687011719" Canvas.Top="108.16665649414" Data="M538.66667,109.33333 L534.66667,137.33333 542,241.33333 584,240.66666 584.66667,205.33334 568,108.66667 540.66667,108.66668" /> <Path x:Name="GPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="111" Height="274.333343505859" Canvas.Left="570.166687011719" Canvas.Top="137.5" Data="M570.66667,248 L582.66667,336 582,411.33333 669.33333,410.66667 672.66667,332.66667 680.66667,330 655.33333,245.33333 631.33333,244 601.33333,138 578.66667,138 594.66667,244.66667 571.33333,248" /> <Path x:Name="G2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="76.3333129882813" Height="131.666656494141" Canvas.Left="603.5" Canvas.Top="110.166664123534" Data="M612,111.33333 L604,136.66667 636,238.66667 636.66667,241.33333 679.33333,241.33333 679.33333,206.66667 641.33333,111.33334 612.66667,110.66668" /> <Path x:Name="APath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="138.333312988281" Height="274.333343505859" Canvas.Left="655.5" Canvas.Top="137.5" Data="M665.33333,246 L694.66667,336.66667 686,411.33333 774.66667,410 785.33333,335.33333 793.33333,328.66667 750.66667,246.66667 722,243.33333 673.33333,138 656,138.66667 688.66667,216.66667 685.33333,245.33333 666,246" /> <Path x:Name="A2Path" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="95" Height="131" Canvas.Left="676.166687011719" Canvas.Top="110.833320617675" Data="M682,111.33333 L676.66667,138.66667 730.66667,240.66667 768.66667,241.33333 770.66667,204.00001 713.33333,111.33334 683.33333,111.33335" /> <Path x:Name="BPath" Opacity="0.01" Fill="#FFFFFFFF" Stretch="Fill" Stroke="#FF000000" Width="172.333312988281" Height="275.666687011719" Canvas.Left="733.5" Canvas.Top="136.833320051431" Data="M758,247.33333 L806,333.33333 790,412 878,412 894.66667,334 905.33333,327.33333 764.66667,138.66667 734,137.33333 776.66667,207.33334 778.66667,246.66668 758.66667,248" /> </Canvas> <Ellipse x:Name="stopRecord" Height="30" Width="30" Canvas.Left="40" Canvas.Top="430" Stroke="Black" StrokeThickness="3" Fill="Red"/> <Ellipse x:Name="startRecord" Height="30" Width="30" Canvas.Left="80" Canvas.Top="430" Stroke="Black" StrokeThickness="3" Fill="Green"/> <Canvas Width="60" Height="30" Canvas.Left="760" Canvas.Top="422" Cursor="Hand"> <TextBlock x:Name="play" TextWrapping="Wrap" FontSize="28" Foreground="#FF4C7185" Text="Play"> </TextBlock> </Canvas> <TextBlock x:Name="lblMussicBook" TextWrapping="Wrap" Canvas.Left="120" Canvas.Top="434" FontSize="14" Foreground="#FFFFFFFF" Text="MusicBook:"> </TextBlock> <TextBlock x:Name="lblName" TextWrapping="Wrap" Canvas.Left="520" Canvas.Top="434" FontSize="14" Foreground="#FFFFFFFF" Text="Name:"> </TextBlock></Canvas>Piano.xaml.js
if (!window.Piano)
window.Piano = {};
window.Piano Piano.Page = function() {
}Piano.Page.prototype ={
handleLoad: function(control, userContext, rootElement) 
{
this.control = control; // Sample event hookup: rootElement.addEventListener("MouseLeftButtonDown", Silverlight.createDelegate(this, this.handleMouseDown));
}, // Sample event handler handleMouseDown: function(sender, eventArgs) { // The following line of code shows how to find an element by name and call a method on it. // this.control.content.findName("Timeline1").Begin(); }}Default.aspx
<%@ Page Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_10_Piano_Default" Title="支持录音和回放的钢琴" %><asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server"> <script type="text/javascript" src="../Silverlight.js"></script> <script type="text/javascript" src="Default.aspx.js"></script> <script type="text/javascript" src="Piano.xaml.js"></script> <script type="text/javascript" src="Piano.js"></script> <style type="text/css"> .silverlightHost { height: 500px; width: 1024px; } </style></asp:Content><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server"> <asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager> <div id="SilverlightControlHost" class="silverlightHost"> <script type="text/javascript"> var txtInput = '<%= txtInput.ClientID %>'; var txtName = '<%= txtName.ClientID %>'; createSilverlight(); </script> <asp:UpdateProgress ID="UpdateProgress1" runat="server"> <ProgressTemplate> <div style="position: absolute; top: 0px; background-color: Red; color: White; z-index: 999"> Loading
</div> </ProgressTemplate> </asp:UpdateProgress> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <asp:GridView ID="GridView1" runat="server" Style="position: absolute; top: 0px; 1024px" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="LinqDataSource1" RowStyle-HorizontalAlign="Center" PageSize="2" OnSelectedIndexChanged="GridView1_SelectedIndexChanged"> <Columns> <asp:CommandField ShowSelectButton="True" HeaderText="选择" ItemStyle-Width="40px"></asp:CommandField> <asp:CommandField ShowDeleteButton="True" HeaderText="删除" ItemStyle-Width="40px"></asp:CommandField> <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" ItemStyle-Width="40px"></asp:BoundField> <asp:BoundField DataField="Name" HeaderText="名称" SortExpression="Name"></asp:BoundField> <asp:TemplateField HeaderText="乐谱" SortExpression="Details" ItemStyle-Width="700px"> <ItemTemplate> <div style="overflow: hidden; 666px"> <asp:Label ID="lblDetails" runat="server" Text='<%# Bind("Details") %>'></asp:Label> </div> </ItemTemplate> </asp:TemplateField> </Columns> </asp:GridView> <asp:TextBox ID="txtInput" runat="server" Style="position: absolute; left: 200px; top: 434px; 300px" /> <asp:TextBox ID="txtName" runat="server" Style="position: absolute; left: 566px; top: 434px;" /> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="btnAdd" /> </Triggers> </asp:UpdatePanel> <asp:LinqDataSource ID="LinqDataSource1" runat="server" ContextTypeName="Data.MusicBookDataContext" EnableDelete="True" TableName="MusicBook"> </asp:LinqDataSource> <asp:Button ID="btnAdd" runat="server" Text="添加" Style="position: absolute; left: 710px; top: 434px;" OnClick="btnAdd_Click" /> </div></asp:Content>Default.aspx.cs
using System;using System.Data;using System.Configuration;using System.Collections;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Xml.Linq;public partial class _10_Piano_Default : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { } protected void btnAdd_Click(object sender, EventArgs e) { Data.MusicBookDataContext mbdc = new Data.MusicBookDataContext(); Data.MusicBook mb = new Data.MusicBook(); mb.Name = txtName.Text; mb.Details = txtInput.Text; mbdc.MusicBook.Add(mb); mbdc.SubmitChanges(); txtName.Text = ""; txtInput.Text = ""; GridView1.DataBind(); } protected void GridView1_SelectedIndexChanged(object sender, EventArgs e) { txtName.Text = GridView1.Rows[GridView1.SelectedIndex].Cells[3].Text; txtInput.Text = ((Label)GridView1.Rows[GridView1.SelectedIndex].Cells[4].FindControl("lblDetails")).Text; }}Default.aspx.js
function createSilverlight(){ var scene = new Webabcd.Piano(); Silverlight.createObjectEx({ source: "Piano.xaml", parentElement: document.getElementById("SilverlightControlHost"), id: "SilverlightControl", properties: { "100%", height: "100%", version: "1.0", isWindowless: "true" }, events: { onLoad: Silverlight.createDelegate(scene, scene.handleLoad) } });}if (!window.Silverlight) window.Silverlight = {};Silverlight.createDelegate = function(instance, method) { return function() { return method.apply(instance, arguments); }}Piano.js
if (!window.Webabcd) window.Webabcd = {};Webabcd.Piano = function() {}Webabcd.Piano.prototype ={ handleLoad: function(control, userContext, rootElement) { // plugin（插件） this.control = control; // 根Canvas元素 this.rootElement = rootElement; // object.addEventListener(eventName, functionReference)为对象添加一个事件监听器（事件名称，函数名称） // Silverlight.createDelegate用来创建一个调用“this”上下文下的特定函数的委托，其被定义在runtime // Silverlight.createDelegate = function(instance, method) // { // return function() // { // return method.apply(instance, arguments); // } // } this.rootElement.addEventListener("GotFocus", Silverlight.createDelegate(this, this.resetPiano)); this.rootElement.addEventListener("KeyDown", Silverlight.createDelegate(this, this.handleKeyDown)); this.rootElement.addEventListener("KeyUp", Silverlight.createDelegate(this, this.handleKeyUp)); // 鼠标热区的Canvas // object.findName(name) this.pathCanvas = rootElement.findName("pathCanvas"); // 开始录制按钮 this.startRecord = rootElement.findName("startRecord"); this.startRecord.addEventListener("MouseLeftButtonDown", Silverlight.createDelegate(this, this.handleStartRecord)); // 停止录制按钮 this.stopRecord = rootElement.findName("stopRecord"); this.stopRecord.addEventListener("MouseLeftButtonDown", Silverlight.createDelegate(this, this.handleStopRecord)); // 默认为选中停止录制按钮 // plugin.content.findName(objectName) document.getElementById('SilverlightControl').content.findName("stopRecord").Stroke = "LightBlue"; document.getElementById('SilverlightControl').content.findName("stopRecord").StrokeThickness = 6; // 播放按钮 this.play = rootElement.findName("play"); this.play.addEventListener("MouseLeftButtonDown", Silverlight.createDelegate(this, this.handlePlay)); // object.children对应<Canvas>一个或多个子元素</Canvas> // object.getItem(index)获取集合内指定的对象 // object.count集合内的成员数量 for(var i = 0; i<this.pathCanvas.children.count; ++i) { // 为所有鼠标热区添加相关的事件监听器 this.pathCanvas.children.getItem(i).addEventListener("MouseLeftButtonDown", Silverlight.createDelegate(this, this.handleMouseDown)); this.pathCanvas.children.getItem(i).addEventListener("MouseLeftButtonUp", Silverlight.createDelegate(this, this.handleMouseUp)); } // 是否启用录制 this._enableRecord = false; // 上一次按键的时间 this._prevTime = new Date().getTime(); }, // 单击开始录制按钮 handleStartRecord: function(sender, eventArgs) { // 设置开始录制按钮样式 sender.Stroke = 'LightBlue'; sender.StrokeThickness = 6; // 设置停止录制按钮样式 document.getElementById('SilverlightControl').content.findName("stopRecord").Stroke = "Black"; document.getElementById('SilverlightControl').content.findName("stopRecord").StrokeThickness = 3; // 启用录音 this._enableRecord = true; // 记录时间 this._prevTime = new Date().getTime(); }, // 单击停止录制按钮 handleStopRecord: function(sender, eventArgs) { // 设置停止录制按钮样式 sender.Stroke = 'LightBlue'; sender.StrokeThickness = 6; // 设置开始录制按钮样式 document.getElementById('SilverlightControl').content.findName("startRecord").Stroke = "Black"; document.getElementById('SilverlightControl').content.findName("startRecord").StrokeThickness = 3; // 清空乐谱名称和乐谱内容 document.getElementById(txtInput).value = ''; document.getElementById(txtName).value = ''; // 停止录音 this._enableRecord = false; }, // 单击播放按钮 handlePlay: function(sender, eventArgs) { // 根据乐谱自动播放 autoPlay(this, 0); }, // 记录乐谱 handleRecord: function(currentPianoKeyID) { if (this._enableRecord) { // 插入乐谱 document.getElementById(txtInput).value += new Date().getTime() - this._prevTime + ','; document.getElementById(txtInput).value += currentPianoKeyID + ';'; // 更新时间 this._prevTime = new Date().getTime(); } }, handleMouseDown: function(sender, eventArgs) { // object.captureMouse()为对象启用鼠标捕捉（鼠标离开热区也可触发相关事件，如MouseLeftButtonUp） sender.captureMouse(); var currentPianoKeyID = sender.name.substr(0, sender.name.indexOf("Path")); var currentImage = sender.findName("img" + currentPianoKeyID); currentImage.opacity = 1; var currentMediaElement = sender.findName(currentPianoKeyID); currentMediaElement.stop(); currentMediaElement.play(); this.handleRecord(currentPianoKeyID); }, handleMouseUp: function(sender, eventArgs) { // object.releaseMouseCapture()释放对象的鼠标捕捉 sender.releaseMouseCapture(); var currentPianoKeyID = sender.name.substr(0, sender.name.indexOf("Path")); var currentImage = sender.findName("img" + currentPianoKeyID); currentImage.opacity = 0; }, pressKey: function (currentPianoKeyID) { var currentImage = this.control.content.findName("img" + currentPianoKeyID); currentImage.opacity = 1; var currentMediaElement = this.control.content.findName(currentPianoKeyID); // object.play()播放，object.pause()暂停，object.stop()停止 currentMediaElement.stop(); currentMediaElement.play(); }, depressKey: function (currentPianoKeyID) { var currentImage = this.control.content.findName("img" + currentPianoKeyID); currentImage.opacity = 0; }, handleKeyDown: function (sender, eventArgs) { switch (eventArgs.Key) { // eventArgs.Key - 获取与该事件相关的键盘按键 case 55: this.pressKey("C"); this.handleRecord("C"); break; case 48: this.pressKey("C2"); this.handleRecord("C2"); break; case 53: this.pressKey("D"); this.handleRecord("D"); break; case 33: this.pressKey("D2"); this.handleRecord("D2"); break; case 32: this.pressKey("E"); this.handleRecord("E"); break; case 51: this.pressKey("F"); this.handleRecord("F"); break; case 36: this.pressKey("F2"); this.handleRecord("F2"); break; case 31: this.pressKey("G"); this.handleRecord("G"); break; case 37: this.pressKey("G2"); this.handleRecord("G2"); break; case 43: this.pressKey("A"); this.handleRecord("A"); break; case 39: this.pressKey("A2"); this.handleRecord("A2"); break; case 42: this.pressKey("B"); this.handleRecord("B"); break; } }, handleKeyUp: function (sender, eventArgs) { switch (eventArgs.Key) { // eventArgs.Key - 获取与该事件相关的键盘按键 case 55: this.depressKey("C"); break; case 48: this.depressKey("C2"); break; case 53: this.depressKey("D"); break; case 33: this.depressKey("D2"); break; case 32: this.depressKey("E"); break; case 51: this.depressKey("F"); break; case 36: this.depressKey("F2"); break; case 31: this.depressKey("G"); break; case 37: this.depressKey("G2"); break; case 43: this.depressKey("A"); break; case 39: this.depressKey("A2"); break; case 42: this.depressKey("B"); break; } }, resetPiano: function(sender, eventArgs) { this.depressKey("C"); this.depressKey("C2"); this.depressKey("D"); this.depressKey("D2"); this.depressKey("E"); this.depressKey("F"); this.depressKey("F2"); this.depressKey("G"); this.depressKey("G2"); this.depressKey("A"); this.depressKey("A2"); this.depressKey("B"); }}var _obj; // Webabcd.Piano对象var _index; // 乐谱索引function autoPlay(obj, index){ _obj = obj; _index = index; execAutoPlay();}function execAutoPlay(){ _obj.resetPiano(); var str = document.getElementById(txtInput).value; // 乐谱 var ary = str.split(';'); // 间隔时间，按键名称 if (_index != 0 && typeof(ary[_index-1]) != 'undefined' && ary[_index-1] != '') { // 按下当前乐谱索引的上一个索引的按键 _obj.pressKey(ary[_index-1].split(',')[1]); } var currentIndex = _index; _index++; if (typeof(ary[currentIndex]) != 'undefined') { setTimeout("_obj.resetPiano();", 100) // 经过当前乐谱索引的间隔时间则调用execAutoPlay() setTimeout("execAutoPlay();", parseInt(ary[currentIndex].split(',')[0], 10)); }}OK
[源码下载]