Description: 默认情况下，.NET的随机数是根据系统时间来生成的，如果电脑速度很快的话，生成的随机数就会一样。
Random rnd = new Random()
int rndNum = rnd.Next() //int 取值范围内的随机数
int rndNum = rnd.Next(10) //得0~9的随机数
int rndNum = rnd.Next(10,20) //得10~19的随机数
int rndNum = rnd.NextDouble() //得0~1的随机数
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File list (Check if you may need any files):
4444\51Aspx源码必读 .txt
....\App.xaml
....\App.xaml.cs
....\bin\Debug\Sounds\alarm_1.mp3
....\...\.....\......\siren_1.mp3
....\...\.....\WpfTimer.application
....\...\.....\WpfTimer.exe
....\...\.....\WpfTimer.exe.manifest
....\...\.....\WpfTimer.pdb
....\...\.....\WpfTimer.vshost.application
....\...\.....\WpfTimer.vshost.exe
....\...\.....\WpfTimer.vshost.exe.manifest
....\Images\TIO_Timer-150x150.png
....\MainWindow.xaml
....\MainWindow.xaml.cs
....\obj\x86\Debug\App.g.cs
....\...\...\.....\App.g.i.cs
....\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
....\...\...\.....\GenerateResource.read.1.tlog
....\...\...\.....\GenerateResource.write.1.tlog
....\...\...\.....\MainWindow.baml
....\...\...\.....\MainWindow.g.cs
....\...\...\.....\MainWindow.g.i.cs
....\...\...\.....\WpfTimer.application
....\...\...\.....\WpfTimer.csproj.FileListAbsolute.txt
....\...\...\.....\WpfTimer.exe
....\...\...\.....\WpfTimer.exe.manifest
....\...\...\.....\WpfTimer.g.resources
....\...\...\.....\WpfTimer.pdb
....\...\...\.....\WpfTimer.Properties.Resources.resources
....\...\...\.....\WpfTimer.TrustInfo.xml
....\...\...\.....\WpfTimer_Content.g.cs
....\...\...\.....\WpfTimer_Content.g.i.cs
....\...\...\.....\WpfTimer_MarkupCompile.cache
....\...\...\.....\WpfTimer_MarkupCompile.i.cache
....\Properties\app.manifest
....\..........\AssemblyInfo.cs
....\..........\Resources.Designer.cs
....\..........\Resources.resx
....\..........\Settings.Designer.cs
....\..........\Settings.settings
....\Sounds\alarm_1.mp3
....\......\siren_1.mp3
....\timer.ico
....\WpfTimer.csproj
....\WpfTimer.csproj.vspscc
....\WpfTimer.sln
....\WpfTimer.suo
....\WpfTimer_TemporaryKey.pfx
....\bin\Debug\Sounds
....\obj\x86\Debug
....\bin\Debug
....\obj\x86
....\bin
....\Images
....\obj
....\Properties
....\Sounds
4444
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