注意：此方法在 .NET Framework 2.0 版中是新增的。
从数据源中移除已配置的
applicationName 的角色。
命名空间:System.Web.Security
程序集:System.Web（在 system.web.dll 中）
Public MustOverride Function DeleteRole ( _
roleName As String, _
throwOnPopulatedRole As Boolean _
) As Boolean
Dim instance As RoleProvider
Dim roleName As String
Dim throwOnPopulatedRole As Boolean
Dim returnValue As Boolean
returnValue = instance.DeleteRole(roleName, throwOnPopulatedRole)
public abstract bool DeleteRole (
string roleName,
bool throwOnPopulatedRole
)
public:
virtual bool DeleteRole (
String^ roleName,
bool throwOnPopulatedRole
) abstract
public abstract boolean DeleteRole (
String roleName,
boolean throwOnPopulatedRole
)
public abstract function DeleteRole (
roleName : String,
throwOnPopulatedRole : boolean
) : boolean
参数
- roleName
要删除的角色的名称。
- throwOnPopulatedRole
如果为 true，则在 roleName 具有一个或多个成员时引发异常，并且不删除 roleName。
返回值
如果成功删除角色，则为 true；否则为 false。
DeleteRole 由 Roles 类的 DeleteRole 和 DeleteRole 方法调用，以从数据源中删除已配置的 ApplicationName 的指定角色。
从数据源删除角色时，确保也删除用户名与已配置的 applicationName 的已删除角色之间的任何关联。
如果 throwOnPopulatedRole 为 true，且由 roleName 参数标识的角色具有一个或多个成员，则引发 ProviderException，并且不删除该角色。如果 throwOnPopulatedRole 为 false，则不论角色是否为空，都会删除该角色。
如果指定角色名不存在，或者如果指定角色名为 空引用（在 Visual Basic 中为 Nothing） 或空字符串，则建议提供程序引发异常。
下面的代码示例演示 DeleteRole 方法的示例实现。
Public Overrides Function DeleteRole(rolename As String, throwOnPopulatedRole As Boolean) As Boolean
If Not RoleExists(rolename) Then
Throw New ProviderException("Role does not exist.")
End If
If throwOnPopulatedRole AndAlso GetUsersInRole(rolename).Length > 0 Then
Throw New ProviderException("Cannot delete a populated role.")
End If
Dim conn As OdbcConnection = New OdbcConnection(connectionString)
Dim cmd As OdbcCommand = New OdbcCommand("DELETE FROM [" & rolesTable & "]" & _
" WHERE Rolename = ? AND ApplicationName = ?", conn)
cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename
cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName
Dim cmd2 As OdbcCommand = New OdbcCommand("DELETE FROM [" & usersInRolesTable & "]" & _
" WHERE Rolename = ? AND ApplicationName = ?", conn)
cmd2.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename
cmd2.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName
Try
conn.Open()
cmd2.ExecuteNonQuery()
cmd.ExecuteNonQuery()
Catch e As OdbcException
' Handle exception.
Return False
Finally
conn.Close()
End Try
Return True
End Function
public override bool DeleteRole(string rolename, bool throwOnPopulatedRole)
{
if (!RoleExists(rolename))
{
throw new ProviderException("Role does not exist.");
}
if (throwOnPopulatedRole && GetUsersInRole(rolename).Length > 0)
{
throw new ProviderException("Cannot delete a populated role.");
}
OdbcConnection conn = new OdbcConnection(connectionString);
OdbcCommand cmd = new OdbcCommand("DELETE FROM [" + rolesTable + "]" +
" WHERE Rolename = ? AND ApplicationName = ?", conn);
cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename;
cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName;
OdbcCommand cmd2 = new OdbcCommand("DELETE FROM [" + usersInRolesTable + "]" +
" WHERE Rolename = ? AND ApplicationName = ?", conn);
cmd2.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename;
cmd2.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName;
try
{
conn.Open();
cmd2.ExecuteNonQuery();
cmd.ExecuteNonQuery();
}
catch (OdbcException)
{
// Handle exception.
return false;
}
finally
{
conn.Close();
}
return true;
}
Windows 98、Windows 2000 SP4、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
.NET Framework
受以下版本支持：2.0