語言

RoleProvider.DeleteRole(String, Boolean) 方法

定義

命名空間:
System.Web.Security
組件:
System.Web.dll
組件:
System.Web.ApplicationServices.dll

從設定 applicationName的 .

public:
 abstract bool DeleteRole(System::String ^ roleName, bool throwOnPopulatedRole);
public abstract bool DeleteRole(string roleName, bool throwOnPopulatedRole);
abstract member DeleteRole : string * bool -> bool
Public MustOverride Function DeleteRole (roleName As String, throwOnPopulatedRole As Boolean) As Boolean

參數

roleName
String

要刪除的角色名稱。

throwOnPopulatedRole
Boolean

如果 true，若 有一名或多名成員，則拋出例外 roleName 且不刪除 roleName。

傳回

Boolean

true若角色成功刪除;否則，。 false

範例

以下程式碼範例展示了該 DeleteRole 方法的範例實作。

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 Roles "  +
                                    " 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 UsersInRoles "  +
                                     " 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;
}

Public Overrides Function DeleteRole(ByVal rolename As String, ByVal 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 Roles " & _
                                             " 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 UsersInRoles " & _
                                              " 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

備註

DeleteRole由 和 該類別的方法DeleteRole呼叫DeleteRoleRoles，以從設定ApplicationName的 。

當你從資料來源刪除角色時，務必同時刪除使用者名稱與已 applicationName刪除角色之間的關聯。

若 throwOnPopulatedRole 是 true，且參數 roleName 所識別的角色包含一個或多個成員，則拋出 a ProviderException 且不刪除該角色。 若 throwOnPopulatedRole 是 false，則無論該角色是否空，都將其刪除。

如果指定的角色名稱不存在、是 null、 或是空字串，我們建議你的提供者拋出例外。

適用於

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