guid

I know the standard GUIDs. Can they be made shorter? What is the theory behind it? Greg Dean's answer is correct but in order to understand how a GUID is generated and why it ought not to be shortened I would highly suggest you read the article below. The Old New Thing : GUIDs are globally unique, but substrings of GUIDs aren't : A customer needed to generate an 8-byte unique value, and their initial idea was to generate a GUID and throw away the second half, keeping the first eight bytes. They wanted to know if this was a good idea. No, it's not a good idea. The GUID generation algorithm

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: How to enumerate all the process' domains without referencing mscoree . Is it possible? I found some solution from 2007 year somewhere in the Internet. But it enumerates and empty collection. Here's the code: public static class DomainHelper { public static AppDomain[] LoadedDomains { get { var loadedDomains = new List<AppDomain>(); var runtimeHost = new CorRuntimeHost() as ICorRuntimeHost; try { var enumeration = IntPtr.Zero; runtimeHost.EnumDomains(out enumeration); try { object nextDomain = null; runtimeHost.NextDomain(enumeration, ref

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm working with a legacy database that stores GUID values as a varchar(36) data type: CREATE TABLE T_Rows ( RowID VARCHAR(36) NOT NULL PRIMARY KEY, RowValue INT NOT NULL ) INSERT T_Rows (RowID, RowValue) VALUES (NEWID(), 1) I would assume that storing a GUID as a uniqueidentifier would be preferable since it's only 16 bytes in size as opposed to 36. Are there any advantages to storing a GUID as a varchar? 回答1: Perhaps only the fact that you can 'read' them from a SELECT statement (although I don't think that's particularly useful as you can

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I assigned some value to object data type like, object objData =dc.GetDirectoryEntry().Properties["objectGUID"].Value; this object retun the value like {byte[16]} [0]: 145 [1]: 104 [2]: 117 [3]: 139 [4]: 124 [5]: 15 [6]: 255 [7]: 68 [8]: 142 [9]: 159 [10]: 208 [11]: 102 [12]: 148 [13]: 157 [14]: 179 [15]: 75 Then i casting this object to byte[], like byte[] binaryData = objData as byte[]; It will also return like, {byte[16]} [0]: 145 [1]: 104 [2]: 117 [3]: 139 [4]: 124 [5]: 15 [6]: 255 [7]: 68 [8]: 142 [9]: 159 [10]: 208 [11]: 102 [12]: 148

I am coming from a nhibernate background and I am wondering how can I generate the Guid automatically on the serer side and not make a round trip to make it on the database side? In fluent nhibernate it is simple just Id(x => x.Id).GeneratedBy.GuidComb(); Richard If you want to generate the key on the server, simply do this in code: public class TestObject { public TestObject() { Id = Guid.NewGuid(); } public Guid Id { get; set; } } If you want the database to generate the key, then use the DatabaseGenerated attribute: public class TestObject { [DatabaseGenerated(DatabaseGeneratedOption

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is it possible to create a code snippet or something similar to automate the process of generating and inserting GUIDs in to the text editor in Visual Studio 2012? I frequently need to generate new GUIDs (WiX installer for example, as well as our own internal framework). I used to use a macro to perform this job, creating a new GUID and then inserting it in to the current ActiveDocument. I would the bind the macro to Shift-Ctrl G so I could rapidly insert a new ID without having to launch the Create Guid tool and copy from there. Macro

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm developing an ASP .Net MVC application. One of my actions requires id as a parameter. For example: public actionresult Detail(Guid id){ return View(); } As you can see, I'm using Guid instead of Int . The issue is more cosmetic. The url can be very long, such as localhost/Detail/0c157b42-379d-41d5-b9ba-83e9df9985b2 . Is it safe to take only parts of the Guid like localhost/Detail/0c157b42 ? 回答1: GUID is designed in such a way that it is intended to be unique, but any part of it is not. See this blog post for details. If you need to