Roles.RemoveUsersFromRole(String[], String) 方法

參考

定義

命名空間:: System.Web.Security

組件:: System.Web.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

從指定角色中移除指定的使用者。

public:
 static void RemoveUsersFromRole(cli::array <System::String ^> ^ usernames, System::String ^ roleName);

public static void RemoveUsersFromRole (string[] usernames, string roleName);

static member RemoveUsersFromRole : string[] * string -> unit

Public Shared Sub RemoveUsersFromRole (usernames As String(), roleName As String)

參數

usernames: String[]

要從指定角色中移除之使用者名稱的字串陣列。

roleName: String

要移除指定使用者之角色的名稱。

例外狀況

ArgumentNullException

roleName 為 null。

-或-

usernames 的其中一個使用者名稱為 null。

ArgumentException

roleName 是空字串，或包含逗號 (,)。

-或-

usernames 的其中一個使用者名稱是空字串，或包含逗號 (,)。

-或-

usernames 包含重複的項目。

ProviderException

未啟用角色管理。

範例

下列程式代碼範例會 RemoveUsersFromRole 使用方法來移除角色中的一或多個使用者。如需啟用角色管理的 Web.config 檔案範例，請參閱 Roles。

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Web.UI" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

string[] rolesArray;
string[] users;

public void Page_Load()
{
  Msg.Text = "";

  if (!IsPostBack)
  {
    // Bind roles to ListBox.

    rolesArray = Roles.GetAllRoles();
    RolesListBox.DataSource = rolesArray;
    RolesListBox.DataBind();
  }
}

public void RolesListBox_OnSelectedIndexChanged(object sender, EventArgs args)
{
  // Bind users to ListBox.

  users = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value);
  UsersListBox.DataSource = users;
  UsersListBox.DataBind();
}

public void RemoveUsers_OnClick(object sender, EventArgs args)
{
  // Verify that at least one user and a role are selected.

  int[] user_indices = UsersListBox.GetSelectedIndices();

  if (user_indices.Length == 0)
  {
    Msg.Text = "Please select one or more users.";
    return;
  }

  if (RolesListBox.SelectedItem == null)
  {
    Msg.Text = "Please select a role.";
    return;
  }


  // Create list of users to be removed from the selected role.

  string[] usersList = new string[user_indices.Length];

  for (int i = 0; i < usersList.Length; i++)
  {
    usersList[i] = UsersListBox.Items[user_indices[i]].Value;
  }


  // Remove the users from the selected role.

  try
  {
    Roles.RemoveUsersFromRole(usersList, RolesListBox.SelectedItem.Value);  
    Msg.Text = "User(s) removed from Role.";

    // Rebind users to ListBox.

    users = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value);
    UsersListBox.DataSource = users;
    UsersListBox.DataBind();
  }
  catch (HttpException e)
  {
    Msg.Text = e.Message;
  } 
}

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Role Membership</title>
</head>
<body>

<form runat="server" id="PageForm">
  <h3>Role Membership</h3>
  <asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
  <table cellpadding="3" border="0">
    <tr>
      <td valign="top">Roles:</td>
      <td valign="top"><asp:ListBox id="RolesListBox" AutoPostBack="true" 
                                    OnSelectedIndexChanged="RolesListBox_OnSelectedIndexChanged" 
                                    runat="server" Rows="8" /></td>
      <td valign="top">Users:</td>
      <td valign="top"><asp:ListBox id="UsersListBox" Rows="8" 
                                    SelectionMode="Multiple" runat="server" /></td>
      <td valign="top"><asp:Button Text="Remove User(s) from Role" id="RemoveUsersButton"
                                   runat="server" OnClick="RemoveUsers_OnClick" /></td>
    </tr>
  </table>
</form>

</body>
</html>

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Web.UI" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

Dim rolesArray() As String
Dim users() As String

Public Sub Page_Load()
  Msg.Text = ""

  If Not IsPostBack Then
    ' Bind roles to ListBox.

    rolesArray = Roles.GetAllRoles()
    RolesListBox.DataSource = rolesArray
    RolesListBox.DataBind()
  End If
End Sub

Public Sub RolesListBox_OnSelectedIndexChanged(sender As Object, args As EventArgs)
  ' Bind users to ListBox.

  users = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value)
  UsersListBox.DataSource = users
  UsersListBox.DataBind()
End Sub

Public Sub RemoveUsers_OnClick(sender As Object, args As EventArgs)
  ' Verify that at least one user and a role are selected.

  Dim user_indices() As Integer = UsersListBox.GetSelectedIndices()

  If user_indices.Length = 0 Then
    Msg.Text = "Please select one or more users."
    Return
  End If

  If RolesListBox.SelectedItem Is Nothing Then
    Msg.Text = "Please select a role."
    Return
  End If


  ' Create list of users to be removed from the selected role.

  Dim usersList(user_indices.Length - 1) As String

  For i As Integer = 0 To usersList.Length - 1
    usersList(i) = UsersListBox.Items(user_indices(i)).Value
  Next


  ' Remove the users from the selected role.

  Try
    Roles.RemoveUsersFromRole(usersList, RolesListBox.SelectedItem.Value)  
    Msg.Text = "User(s) removed from Role."

    ' Rebind users to ListBox.

    users = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value)
    UsersListBox.DataSource = users
    UsersListBox.DataBind()
  Catch e As HttpException
    Msg.Text = e.Message
  End Try
End Sub

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Sample: Role Membership</title>
</head>
<body>

<form runat="server" id="PageForm">
  <h3>Role Membership</h3>
  <asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />
  <table cellpadding="3" border="0">
    <tr>
      <td valign="top">Roles:</td>
      <td valign="top"><asp:ListBox id="RolesListBox" AutoPostBack="true" 
                                    OnSelectedIndexChanged="RolesListBox_OnSelectedIndexChanged" 
                                    runat="server" Rows="8" /></td>
      <td valign="top">Users:</td>
      <td valign="top"><asp:ListBox id="UsersListBox" Rows="8" 
                                    SelectionMode="Multiple" runat="server" /></td>
      <td valign="top"><asp:Button Text="Remove User(s) from Role" id="RemoveUsersButton"
                                   runat="server" OnClick="RemoveUsers_OnClick" /></td>
    </tr>
  </table>
</form>

</body>
</html>

備註

方法 RemoveUsersFromRole 會呼叫預設角色提供者，以從數據源的指定角色中移除指定的使用者。

如果應用程式使用 SqlRoleProvider 類別，則會在交易內呼叫 RemoveUsersFromRoles 方法期間執行的資料庫更新。如果遇到錯誤，例如不在指定角色的用戶名稱，則會回復交易，而且不會執行任何更新。

適用於

另請參閱

瞭解角色管理 ASP.NET

共用方式為

Roles.RemoveUsersFromRole(String[], String) 方法

定義

參數

例外狀況

範例

備註

適用於

另請參閱

其他資源