Linux 开机启动服务

开机启动服务：

chkconfig --add test
chkconfig test on

查看开启的服务列表：

chkconfig --list

参考：https://www.thegeekstuff.com/2011/06/chkconfig-examples/
 

WPF 问题记录之 Window (宽/高)大小自动适配内容尺寸

使用属性 Window.SizeToContent

参考：
https://stackoverflow.com/questions/3177138/how-can-i-get-a-wpf-window-to-expand-to-fit-the-contents-of-a-dynamically-changi
https://docs.microsoft.com/en-us/dotnet/api/system.windows.window.sizetocontent

C3850-48P-L Switch 升级固件

Cisco IOS-XE 3.x

1. 下载 IOS-XE .bin 文件，链接https://software.cisco.com/download/home/284455380/type/282046477/release/3.6.9E（须先登录 Cisco 账户）

2. 通过 TFTP 传输 .bin 文件到交换机 flash

copy tftp://192.168.1.10/cat3k_caa-universalk9.SPA.03.06.09.E.152-2.E9.bin cat3k_caa-universalk9.SPA.03.06.09.E.152-2.E9.bin

3.  Install 模式升级

software install file flash:cat3k_caa-universalk9.SPA.03.06.09.E.152-2.E9.bin

4. 清理

software clean

若要升级到 Cisco IOS-XE 16.x 版本，遇到兼容性检测提示未满足包依赖

Candidate package compatibility checks failed because the following
package dependencies were not satisfied. Operation aborted.

则可尝试在安装命令后添加 new force

software install file flash:cat3k_caa-universalk9.16.06.04a.SPA.bin new force

Cisco IOS-XE 16.x

1. Install 模式升级 

request platform software package install switch all file flash:cat3k_caa-universalk9.16.06.04a.SPA.bin

2. 清理

request platform software package clean switch all file flash:

    或者

request platform software package clean 

注:  16.x 版本无 software install / software clean 命令，这里 switch all 指的是所有 switch

参考：
https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/117552-technote-cat3850-00.html
https://www.booches.nl/2016/03/cisco-ios-xe-16-x/
https://community.cisco.com/t5/switching/unable-to-use-quot-software-quot-command-on-cisco-catalyst-3850/td-p/2978615
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/16-3/release_notes/ol-16-3-3850.html

WPF 问题记录之 DataGridCell 的 TextBlock.Padding 属性不生效

修改 DataGridCell 的 TextBlock.Padding 属性或者 Padding 属性不生效


方案1，修改ControlTemplate
参考：
https://stackoverflow.com/questions/5246745/set-a-padding-on-datagridcells-in-wpf


方案2 ，修改 DataGridTextColumn 的 ElementStyle 属性
参考同一个贴子最上面的楼主回复

1  ok, I accepted your answer though I found an other way (a bit more of a hack, but easier in my case): Set up the margin property on the cell's content by using the ElementStyle property. Your solution is nicer though.

ElementStyle 属性用法参考：
https://blogs.msdn.microsoft.com/vinsibal/2008/08/19/wpf-datagrid-stock-and-template-columns/

激活 Windows Server 2016 虚拟机里的系统

1. 查看当前系统（评估版本）可以升级到的版本

DISM /online /Get-TargetEditions

2.升级

DISM /online /Set-Edition:<edition ID> /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula

Guest Operating System	Key
Windows Server 2012 R2 Essentials	K2XGM-NMBT3-2R6Q8-WF2FK-P36R2
Windows Server 2012 R2 Standard	DBGBW-NPF86-BJVTX-K3WKJ-MTB6V
Windows Server 2012 R2 Datacenter	Y4TGP-NPTV9-HTC2H-7MGQ3-DV4TW
Windows Server 2016 Essentials	B4YNW-62DX9-W8V6M-82649-MHBKQ
Windows Server 2016 Standard	C3RCX-M6NRP-6CXC9-TW2F2-4RHYD
Windows Server 2016 Datacenter	TMJ3Y-NTRTM-FJYXT-T22BY-CWG3J

ProductKey 参考：https://www.altaro.com/hyper-v/hyper-v-automatic-virtual-machine-activation-windows-server-2016/

参考：
https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-R2-and-2012/jj574204(v=ws.11)
https://social.technet.microsoft.com/Forums/windows/en-US/7e10693b-4317-4a48-b3a5-80744b96a816/windows-2012-r2-standard-evaluation-to-licenced-version?forum=winserver8setup

查看FortiGate防火墙硬件参数

查看FortiGate防火墙硬件参数：CPU, RAM, Flash, Hard Disk

Dashboard -> CLI Console:

get hardware status

.NET 冷知识之 System.Timers.Timer

对于定时器 System.Timers.Timer
启动后，即使定时器处于如下状态：

Timer.AutoReset = false;
Timer.Enabled = false;

改变 Timer.Interval 仍会引起定时器重新启动计时

参考：
https://social.msdn.microsoft.com/Forums/en-US/6b2181e0-94c5-499f-a9ae-cbabd4d016da/changing-interval-of-timer-while-enabled?forum=csharpgeneral
https://stackoverflow.com/questions/5478442/system-timers-timer-interval-resetting-causing-restart