The `HierarchyId` type can be used for properties of an entity type. For example, assume we want to model personnel in an organization. Each person has a name and a manager. The manager is also a person. We can model this using the following entity type:
The `HierarchyId` type can be used for properties of an entity type. For example, assume we want to model the personnel in an organization. Each person has a name and a manager. The manager is also a person. We can model this using the following entity type:
```csharp
public class Person
@ -27,7 +27,7 @@ public class Person
}
```
Each person can be traced from the patriarch down the tree using its `Manager` property. SQL Server uses a compact binary format for these paths, but it is common to parse to and from a human-readable string representation when when working with code. In this representation, the position at each level is separated by a `/` character.
Each person can be traced from the patriarch down the tree using its `Manager` property. SQL Server uses a compact binary format for these paths, but it is common to parse to and from a human-readable string representation when working with code. In this representation, the position at each level is separated by a `/` character.
var parent = await context.Persons.Where(x => x.Manager.GetAncestor(1) == manager).SingleAsync();
```
For example, your company may want to change manager for an organizational unit. To do this, you can use the `GetReparentedValue` method to update the manager for all descendants of the organizational unit.
For example, your company may want to change the manager of an organizational unit. To do this, you can use the `GetReparentedValue` method to update the manager for all descendants of the organizational unit.
```csharp
var newManager = await context.Persons.SingleAsync(x => x.Id == newManagerId);
Hamza Albreem
2 years ago
GitHub