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 679.33333,206.66667 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 = {} ;

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" >

</ div >

</ Progresstemplate >

</ asp:UpdateProgress >

< asp:UpdatePanel ID ="UpdatePanel1" runat ="server" >

< ContentTemplate >

< asp:GridView ID ="GridView1" runat ="server" Style ="position: absolute; top: 0px;

width: 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; width: 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; width: 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: {

width: "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()

@H_617_4040@

@H_291_4043@

@H_607_4048@{

}

Webabcd.Piano.prototype =

{

handleLoad: function(control, 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", this.resetPiano));

this.rootElement.addEventListener("KeyDown", this.handleKeyDown));

this.rootElement.addEventListener("KeyUp", 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", this.handleStartRecord));

// 停止录制按钮

this.stopRecord = rootElement.findName("stopRecord");

this.stopRecord.addEventListener("MouseLeftButtonDown", 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", 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", this.handleMouseDown));

this.pathCanvas.children.getItem(i).addEventListener("MouseLeftButtonUp", 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]

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)

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