### Asynchronous programming in .NET by Gerardo Lijs Twitter @GerardoLijs April 2019 ## Content What is Asynchronous Programming CPU-bound vs IO-bound Obsolete patterns Tasks and async/await Practical Responsive user interfaces ## Demo of a WPF desktop application • Targets .NET Core 3 Preview4 but works exactly the same with .NET 4.7.2 or earlier • The behaviour is the same in WinForms You will need need https://dotnet.microsoft.com/download/dotnet-core/3.0 and VS 2019 enabled for .NET Core https://visualstudiomagazine.com/articles/2019/03/08/vs-2019-core-tip.aspx ## Responsive user interfaces ##

### .NET Conf China 2022  扫码下载代码示例和PPT  群名称：C#/.NET计算机视觉技术交流 群号：579060605 群名称：C#/.NET计算机视觉技术交流 群号：579060605  ### .NET玩转音视频操作 FFmpeg 周杰 (来自长沙) Handshakes [Image](/uploads/documents/1/3/e/9/13e92ac3d6e07c98233b42038cf0b537/p1_4.jpg) ### .NET使用FFmpeg两类方法和相关库 ## 命令行 FFmpeg.NET • MediaToolkit • Xabe.Ffmpeg · 自己写 ## C API平台调用 FFmpeg.AutoGen • EmguFFmpeg

controls 5 Board layers 5 The appearance panel 5 Selection and the selection filter 7 Net highlighting 8 Cross-probing from the schematic 8 Left toolbar display controls 8 Creating a PCB 10 Measurement tool 54 Design rule checking 54 Find tool 58 Search panel 59 3D Viewer 59 Net inspector 62 Generating outputs 64 Fabrication outputs and plotting ..... 64 Drill files ..... ## Net and net class controls The Nets tab of the appearance panel shows a list of all nets and net classes in the board. Each net has a visibility control that controls the visibility of that net in

- 面向 RPC 场景的网络库 应用层 RPC 框架 KiteX HTTP 框架 Hertz 网络层 Netpoll Go net ## Netpoll - 性能表现 ||Thrift (echo 1KB)|RPC|Netpoll|Go net| |---|---|---|---|---| ||QPS|2.5x|1.0x|| |Environment|TP99|0.34x|1.0x|| 249e4a795ffb5d846c99e052/p6_1.jpg) 设计实现 01 性能亮点 02 高级特性 03 展望未来 04 ## Go net 在 RPC 场景下的问题 ### 1. Conn 难以探活，维护连接池成本高  // Is conn active ? conn.Write(request) // Is conn active ? connpool.Put(conn) ## Go net 在 RPC 场景下的问题 1. Conn 难以探活，维护连接池成本高 2. BIO 式编程， 连接量大时，调度开销大 go func() { for { conn,

controls 5 Board layers 5 The appearance panel 5 Selection and the selection filter 7 Net highlighting 8 Cross-probing from the schematic 8 Left toolbar display controls 8 Creating a PCB 10 Inspecting a board 43 Measurement tool 43 Design rule checking 43 Find tool 46 3D Viewer 47 Net inspector 50 Generating outputs 52 Fabrication outputs and plotting ..... 52 Drill files ..... ## Net and net class controls The Nets tab of the appearance panel shows a list of all nets and net classes in the board. Each net has a visibility control that controls the visibility of that net in

controls … 6 Board layers … 6 The appearance panel … 6 Selection and the selection filter … 8 Net highlighting … 9 Cross-probing from the schematic … 10 Left toolbar display controls … 10 Creating a PCB 121 Board Statistics … 137 Measurement tool … 139 Find tool … 139 Search panel … 140 3D Viewer … 141 Net inspector … 144 Generating outputs … 147 Fabrication outputs and plotting … 147 Drill files … 150 IPC-2581 list. Net and net class controls The Nets tab of the appearance panel shows a list of all nets and net classes in the board. Each net has a visibility control that controls the visibility of that net in the

controls 5 Board layers 5 The appearance panel 5 Selection and the selection filter 7 Net highlighting 8 Cross-probing from the schematic 9 Left toolbar display controls 9 Creating a PCB 11 83 Board Statistics ..... 87 Find tool ..... 88 Search panel ..... 89 3D ビューア ..... 90 Net inspector ..... 92 Generating outputs ..... 95 Fabrication outputs and plotting ..... 95 Drill ## Net and net class controls The Nets tab of the appearance panel shows a list of all nets and net classes in the board. Each net has a visibility control that controls the visibility of that net in

controls 5 Board layers 5 The appearance panel 5 Selection and the selection filter 7 Net highlighting 8 Cross-probing from the schematic 9 Left toolbar display controls 9 Creating a PCB 11 83 Board Statistics ..... 87 Find tool ..... 88 Search panel ..... 89 3D Viewer ..... 90 Net inspector ..... 92 Generating outputs ..... 95 Fabrication outputs and plotting ..... 95 Drill ## Net and net class controls The Nets tab of the appearance panel shows a list of all nets and net classes in the board. Each net has a visibility control that controls the visibility of that net in

Hierarchical design examples ..... 34 Inspecting a schematic ..... 37 Find tool ..... 37 Net highlighting ..... 38 Cross-probing from the PCB ..... 38 Design verification with Electrical Rules Check click or Alt|long click or Option|Clarify selection from a pop-up menu.| |Ctrl|Ctrl|Cmd|Highlight the net of the selected copper item.| The following modifier keys apply when dragging to perform a box selection: |A+|Highlight a net by marking its wires and net labels with a different color. If the PCB Editor is also open then copper corresponding to the selected net will be highlighted as well. Net highlighting can be

Hierarchical design examples ..... 34 Inspecting a schematic ..... 37 Find tool ..... 37 Net highlighting ..... 38 Cross-probing from the PCB ..... 38 使用电气规则检查进行设计验证 ..... 38 Assigning Footprints click or Alt|long click or Option|Clarify selection from a pop-up menu.| |Ctrl|Ctrl|Cmd|Highlight the net of the selected copper item.| The following modifier keys apply when dragging to perform a box selection: |A+|Highlight a net by marking its wires and net labels with a different color. If the PCB Editor is also open then copper corresponding to the selected net will be highlighted as well. Net highlighting can be