共用方式為


Roles.Provider 屬性

定義

取得應用程式的預設角色提供者。

public:
 static property System::Web::Security::RoleProvider ^ Provider { System::Web::Security::RoleProvider ^ get(); };
public static System.Web.Security.RoleProvider Provider { get; }
static member Provider : System.Web.Security.RoleProvider
Public Shared ReadOnly Property Provider As RoleProvider

屬性值

應用程式的預設角色提供者,公開為繼承 RoleProvider 抽象類別的類別。

例外狀況

未啟用角色管理。

範例

下列程式代碼範例會將預設角色提供者 WindowsTokenRoleProvider 轉換成,並在允許用戶檢視應用程式的角色設定之前,先檢查目前登入的使用者是否為 Administrators 角色。 如需啟用角色管理的 Web.config 檔案範例,請參閱 WindowsTokenRoleProvider

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Web.Security" %>
<%@ Import Namespace="System.Security.Principal" %>
<!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;

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

  WindowsPrincipal p = (WindowsPrincipal)System.Threading.Thread.CurrentPrincipal;

  if (!p.IsInRole(WindowsBuiltInRole.Administrator))
  {
    Msg.Text = "You are not authorized to view user roles.";
    return;
  }


  // Bind roles to GridView.

  try
  {
    rolesArray = Roles.GetRolesForUser(User.Identity.Name);
  }
  catch (HttpException e)
  {
    Msg.Text = "There is no current logged on user. Role membership cannot be verified.";
    return;
  }

  UserRolesGrid.DataSource = rolesArray;
  UserRolesGrid.DataBind();

  UserRolesGrid.Columns[0].HeaderText = "Roles for " + User.Identity.Name;
}

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

<form runat="server" id="PageForm">

  <h3>View User Roles</h3>

  <asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />

  <table border="0" cellspacing="4">
    <tr>
      <td valign="top"><asp:GridView runat="server" CellPadding="4" id="UserRolesGrid" 
                                     AutoGenerateColumns="false" Gridlines="None" 
                                     CellSpacing="0" >
                         <HeaderStyle BackColor="navy" ForeColor="white" />
                         <Columns>
                           <asp:TemplateField HeaderText="Roles" >
                             <ItemTemplate>
                               <%# Container.DataItem.ToString() %>
                             </ItemTemplate>
                           </asp:TemplateField>
                         </Columns>
                       </asp:GridView></td>
    </tr>
  </table>

</form>

</body>
</html>
<%@ Page Language="VB" %>
<%@ Import Namespace="System.Web.Security" %>
<!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

Public Sub Page_Load()
  Msg.Text = ""

  Dim provider As WindowsTokenRoleProvider = CType(Roles.Provider, WindowsTokenRoleProvider)

  If Not provider.IsUserInRole(User.Identity.Name, _
                               System.Security.Principal.WindowsBuiltInRole.Administrator) Then
    Msg.Text = "You are not authorized to view user roles."
    Return
  End If


  ' Bind roles to GridView.

  Try
    rolesArray = Roles.GetRolesForUser(User.Identity.Name)
  Catch e As HttpException
    Msg.Text = "There is no current logged on user. Role membership cannot be verified."
    Return
  End Try

  UserRolesGrid.DataSource = rolesArray
  UserRolesGrid.DataBind()

  UserRolesGrid.Columns(0).HeaderText = "Roles for " & User.Identity.Name
End Sub

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

<form runat="server" id="PageForm">

  <h3>View User Roles</h3>

  <asp:Label id="Msg" ForeColor="maroon" runat="server" /><br />

  <table border="0" cellspacing="4">
    <tr>
      <td valign="top"><asp:GridView runat="server" CellPadding="4" id="UserRolesGrid" 
                                     AutoGenerateColumns="false" Gridlines="None" 
                                     CellSpacing="0" >
                         <HeaderStyle BackColor="navy" ForeColor="white" />
                         <Columns>
                           <asp:TemplateField HeaderText="Roles" >
                             <ItemTemplate>
                               <%# Container.DataItem.ToString() %>
                             </ItemTemplate>
                           </asp:TemplateField>
                         </Columns>
                       </asp:GridView></td>
    </tr>
  </table>

</form>

</body>
</html>

備註

屬性 Provider 可讓您直接參考應用程式的預設角色提供者。 這通常用來存取不屬於抽象類之角色提供者的 RoleProvider 自定義成員。

例如,類別 WindowsTokenRoleProvider 包含方法的多 IsUserInRole 載,可讓您使用 WindowsBuiltInRole 列舉值來判斷使用者是否為通用 Windows 角色。 您可以使用 屬性取得應用程式類別WindowsTokenRoleProvider的參考,而且可以轉換成 WindowsTokenRoleProvider ,以便參考IsUserInRoleProvider載。

如果為應用程式設定多個角色提供者,您可以使用 集合來存取不同的角色提供者 Providers

適用於

另請參閱