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Increment Guid in C#

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I have an application that has a guid variable which needs to be unique (of course). I know that statistically any guid should just be assumed to be unique, but due to dev/test environment reasons, the same value may be seen multiple times. So when that happens, I want to "increment" the value of the Guid, rather than just creating a whole new one. There does not seem to be a simple way to do this. I found a hack, which I will post as a possible answer, but want a cleaner solution. You can get the byte components of the guid, so you can just work on that: static class GuidExtensions { private

Could this cause multiple identical GUIDs?

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问题 As GUID generation is time-dependent, if System.Guid.NewGuid() is called multiple times at the exact same instant on different threads, could it return identical GUIDs? 回答1: On Windows, GUIDs (UUIDs) are created from a cryptographic random number generator with UuidCreate. They are version 4 UUIDs in terms of RFC 4122. No timestamps or ethernet cards are involved, unless you're using old school version 1 GUIDs created with UuidCreateSequential. See also How Random is System.Guid.NewGuid()?

TextWriterTraceListener and trace filenames with GUIDs

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I use TextWriterTraceListener ( System.Diagnostics ) in my application to trace several things like exceptions,... The application is running on a terminal server and if there are many users using it simultaneously the listener starts to create many tracefiles with random GUIDs in the filename. Are there possibilities or workarounds to avoid this behaviour ? I've just taken a look at the documentation for TextWriterTraceListener and there's a note about 1/3 of the way down the page If an attempt is made to write to a file that is in use or unavailable, the file name is automatically prefixed

C++ MFC create IShellItem from CLSID (GUID)

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I have to create a ShellItem to Windows Help and Windows Run... I have this Help and Support {2559a1f1-21d7-11d4-bdaf-00c04f60b9f0} Run {2559a1f3-21d7-11d4-bdaf-00c04f60b9f0} from http://www.sevenforums.com/tutorials/110919-clsid-key-list-windows-7-a.html I've tried IShellFolder* desk = NULL; HRESULT hr =SHGetDesktopFolder(&desk); LPITEMIDLIST pidl2=NULL; ULONG cbEaten; DWORD dwAttribs = 0 ; hr = desk->ParseDisplayName(NULL, NULL, L"::{2559A1F1-21D7-11D4-BDAF-00C04F60B9F0}", &cbEaten, // This can be NULL &pidl2, &dwAttribs); It returns OK but Null as pidl2 could you guys give me some help?

Get Window handle (IntPtr) from Selenium webdriver's current window GUID

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问题 I'm trying to capture a screenshot of whole browser screen (e.g. with any toolbars, panels and so on) not only an entire page, so I'm got this code: using (FirefoxDriver driver = new FirefoxDriver()) { driver.Navigate().GoToUrl(url); ScreenCapture sc = new ScreenCapture(); // How can I find natural IntPtr handle of window here, using GUID-like identifier returning by driver.currentWindowHandle? Image img = sc.CaptureWindow(...); MemoryStream ms = new MemoryStream(); img.Save(ms, ImageFormat

C++ MFC create IShellItem from CLSID (GUID)

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问题 I have to create a ShellItem to Windows Help and Windows Run... I have this Help and Support {2559a1f1-21d7-11d4-bdaf-00c04f60b9f0} Run {2559a1f3-21d7-11d4-bdaf-00c04f60b9f0} from http://www.sevenforums.com/tutorials/110919-clsid-key-list-windows-7-a.html I've tried IShellFolder* desk = NULL; HRESULT hr =SHGetDesktopFolder(&desk); LPITEMIDLIST pidl2=NULL; ULONG cbEaten; DWORD dwAttribs = 0 ; hr = desk->ParseDisplayName(NULL, NULL, L"::{2559A1F1-21D7-11D4-BDAF-00C04F60B9F0}", &cbEaten, // This

ID生成算法(二)

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上一篇文章介绍了一种用雪花算法生成GUID的方法，下面介绍里外一种生成GUID并导出为.txt文件的方法：话不多少 show you the code ! <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>GUID</title> </head> <body> <button id="save" type="button">保存GUID文件</button> <script type="text/javascript"> var GUID_ALPHABET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_"; var GUID_LENGTH = 20,res = []; var guid = function(a) { // 改变参数i,想要多少个给多少 for (var i = 0; i < 10; i++) { a = null != a ? a :

Understanding Dean Edwards' addevent JavaScript

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I need help understanding this piece of code. What is the point of handler.guid ? Why is there a need for a hash table? What is the point of: if ( element["on" + type]) { handlers[0] = element["on" + type]; } What does the "this" refer to in handleEvent , the element or the the addEvent function? function addEvent(element, type, handler) { // assign each event handler a unique ID if (!handler.$$guid) handler.$$guid = addEvent.guid++; // create a hash table of event types for the element if (!element.events) element.events = {}; // create a hash table of event handlers for each element/event

How to extract a GUID from a Win32 DLL or OCX

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We have a .NET app that needs to examine a folder that may contain COM libraries (DLL and OCX.) When we do encounter a COM library one thing we need to accomplish is to extract the GUID from the COM DLL or OCX. Is there a straightforward way to do this with .NET without using 3rd party libraries? JohnFx This should work for you. It requires a reference to c:\windows\system32\tlbinf32.dll , but I'm assuming that is okay because it isn't a third party component. Imports TLI 'from c:\windows\system32\tlbinf32.dll Dim reglib As TLI.TLIApplication = New TLI.TLIApplicationClass() Dim DLLPath As

什么是GUID？

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什么是 GUID？全球唯一标识符 (GUID) 是一个字母数字标识符，用于指示产品的唯一性安装。在许多流行软件应用程序（例如 Web 浏览器和媒体播放器）中，都使用 GUID。 GUID 的格式为“xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”，其中每个 x 是 0-9 或 a-f 范围内的一个十六进制的数字。例如：6F9619FF-8B86-D011-B42D-00C04FC964FF 即为有效的 GUID 值。为什么要用GUID？世界上的任何两台计算机都不会生成重复的 GUID 值。GUID 主要用于在拥有多个节点、多台计算机的网络或系统中，分配必须具有唯一性的标识符。在 Windows 平台上，GUID 应用非常广泛：注册表、类及接口标识、数据库、甚至自动生成的机器名、目录名等。 guid 在线生成 http://www.guidgen.com 一次生成一条稳定高效 http://www.guidgenerator.com/online-guid-generator.aspx 一次可以生成多条 https://blog.csdn.net/diyu122222/article/details/79791073 定义及格式 1、全局唯一标识符（GUID，Globally Unique Identifier