AuthorizationStoreRoleProvider.RoleExists Method (String)
Gets a value indicating whether the specified role name already exists in the authorization-manager policy store.
Assembly: System.Web (in System.Web.dll)
Parameters
- roleName
-
Type:
System.String
The name of the role to search for in the authorization-manager policy store.
Return Value
Type: System.Booleantrue if the role name already exists in the authorization-manager policy store; otherwise, false.
| Exception | Condition |
|---|---|
| ArgumentNullException | roleName is null. |
| ArgumentException | roleName is an empty string. -or- roleName contains a comma. |
| ProviderException | The configured applicationName was not found. -or- The configured scopeName was not found. -or- The authorization-manager runtime is not installed on the server. |
| FileNotFoundException | The connectionStringName attribute references a connection string to a file that does not exist. |
| HttpException | The AuthorizationStoreRoleProvider instance is configured with a file-based policy store, and read access to the file is not allowed at the current trust level. |
The RoleExists method is called by the Roles class to determine whether a role name exists in the authorization-manager data store specified in the ASP.NET application's configuration file (Web.config).
The following code example uses the RoleExists method to determine whether a role name already exists before creating the role. For an example of a Web.config file that enables role management, see AuthorizationStoreRoleProvider.
Available since 2.0