Public Property BasePermissions As SPBasePermissions

Dim instance As SPRoleDefinition
Dim value As SPBasePermissions

value = instance.BasePermissions

instance.BasePermissions = value

public SPBasePermissions BasePermissions { get; set; }

Property Value

When assigning permissions to the BasePermissions property, you can use the following operators:

• & - bitwise AND

• ^ - exclusive OR

• | - inclusive OR

For Windows SharePoint Services permissions, you often work with each permission individually, so it is common to use ^ or | as operators.

The following three lines illustrate operator usage:

1) oRoleDefinition.BasePermissions |= SPBasePermissions.ManageSubwebs;

Retains the current permissions mask but adds ManageSubwebs to the mask.

2) oRoleDefinition.BasePermissions ^= SPBasePermissions.CreateSSCSite;

Retains the current permissions mask but removes CreateSSCSite from the mask.

3) oRoleDefinition.BasePermissions &= SPBasePermissions.CreateAlerts;

Reduces the permissions mask so that it only contains CreateAlerts.

The following code example shows how to modify the base permissions of a role definition that originally has full permissions to a Web site by excluding ManagePermissions.

using (SPWeb oWebsite = SPContext.Current.Site.AllWebs["Subsite_Name"])
{
    SPRoleDefinitionCollection collRoles = oWebsite.RoleDefinitions;
    SPRoleDefinition oRoleDefinition = collRoles["Definition_Name"];
    oRoleDefinition.BasePermissions = SPBasePermissions.FullMask ^ 
        SPBasePermissions.ManagePermissions;

    oRoleDefinition.Update();
}

Note:
Certain objects implement the IDisposable interface, and you must avoid retaining these objects in memory after they are no longer needed. For information about good coding practices, see Best Practices: Using Disposable Windows SharePoint Services Objects.