SequentialGuid Class
The SequentialGuid class is used for generating unique sequential GUIDs.
This can be particularly useful for databases where GUIDs are used as primary keys do facilitate row insert speed reducing fragmentation and overhead on indexing maintenance.
Namespace:
WalterAssembly: Walter (in Walter.dll)
Remarks
Examples
Introduction to Sequential GUID Tests
These tests are designed to verify the behavior of GUIDs generated using our custom SequentialGuid.NewGuid() method. This method is intended to create globally unique identifiers (GUIDs) that are sequential, which can be beneficial for database indexing and retrieval performance. We have two specific tests to validate the essential characteristics of our GUID generation method:
- Test for Uniqueness with the Same Timestamp (SequentialGuidTest):
- Test for Sequential Order (SortOrderFirstIsBeforeSecond):
Test for Uniqueness with the Same Timestamp
[TestMethod()] public void SequentialGuidTest() { // Arrange var time = DateTime.UtcNow; // Act var guid1 =SequentialGuid.NewGuid(time); var guid2 = SequentialGuid.NewGuid(time); // Assert Assert.AreNotEqual(guid1, guid2); }
Test for Sequential Order
[TestMethod] public void SortOrderFirstIsBeforeSecond() { // Arrange var first = SequentialGuid.NewGuid(); var second = SequentialGuid.NewGuid(); // Act var result = first.CompareTo(second); // Assert Assert.IsTrue(result< 0); }