Generate UUID (GUID) in C#

which is a 128-bit UUID fully compatible with the RFC 4122 standard. Is Guid.NewGuid() thread-safe in C#? Yes. Guid.NewGuid() is thread-safe and can be called concurrently from multiple threads without synchronization. How do I use a GUID as a primary key in Entity Framework Core? Set the entity's Id property type to Guid. EF Core will automatically generate a new GUID when a new entity is inserted. For SQL Server， "N" for 32 hex digits without hyphens。

What is the difference between UUID and GUID in C#? They are the same thing. GUID (Globally Unique Identifier) is Microsoft's name for a UUID. C# uses the System.Guid type，。

and "P" for parentheses format. For most interoperability (e.g. sending to a REST API or storing in a database)， "B" for braces format， the default hyphenated "D" format is correct. ， configure .HasDefaultValueSql("newsequentialid()") in OnModelCreating for index-friendly sequential GUIDs. What format string should I use with Guid.ToString() in C#? Use "D" (default) for the standard hyphenated format。