Defines the role definitions that are bound to a role assignment object.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
If a user has both the Full Control and Contribute roles, the role assignment for the user includes these two role definitions in the role definition binding collection.
To get the collection of role definitions that are bound to a role assignment, use the RoleDefinitionBindings property of the SPRoleAssignment class. Use the Add method to add a role definition to the collection.
Use an indexer to return a single item from the collection. For example, if the collection is assigned to a variable named myRoleDefinitionBindings, use myRoleDefinitionBindings[index] in C# or myRoleDefinitionBindings(index) in Visual Basic, where index is either the index number of the item in the collection or a string that contains the name of the role definition.