通过

SqlRoleProvider.DeleteRole(String, Boolean) 方法

  • 参考

定义

命名空间:
System.Web.Security
程序集:
System.Web.dll

从角色数据库移除一个角色。

public:
 override bool DeleteRole(System::String ^ roleName, bool throwOnPopulatedRole);
public override bool DeleteRole (string roleName, bool throwOnPopulatedRole);
override this.DeleteRole : string * bool -> bool
Public Overrides Function DeleteRole (roleName As String, throwOnPopulatedRole As Boolean) As Boolean

参数

roleName
String

要删除的角色的名称。

throwOnPopulatedRole
Boolean

如果为 true，则当 roleName 包含一个或多个成员时将引发异常。

返回

Boolean

若已成功删除此角色，则为 true；否则为 false。

例外

ArgumentNullException

roleName 为 null（在 Visual Basic 中为 Nothing）。

ArgumentException

roleName 为空字符串或者包含逗号。

  • 或 -

roleName 的长度超过 256 个字符。

ProviderException

roleName 具有一个或多个成员且 throwOnPopulatedRole 为 true。

  • 或 -

与数据库进行通信时发生未知错误。

示例

以下示例从数据库中删除角色。 有关启用角色管理的Web.config文件的示例，请参阅 SqlRoleProvider。


<%@ Page Language="C#" %>

<%@ 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">

  string[] rolesArray;

  public void Page_Load(object sender, EventArgs args)
  {
    if (!IsPostBack)
    {
      // Bind roles to ListBox.

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


  public void DeleteRole_OnClick(object sender, EventArgs args)
  {
    string delRole = "";

    try
    {
      delRole = RolesListBox.SelectedItem.Value;

      Roles.DeleteRole(delRole);

      Msg.Text = "Role '" + Server.HtmlEncode(delRole) + "' deleted.";


      // Re-bind roles to ListBox.

      rolesArray = Roles.GetAllRoles();
      RolesListBox.DataSource = rolesArray;
      RolesListBox.DataBind();
    }
    catch
    {
      Msg.Text = "Role '" + Server.HtmlEncode(delRole) + "' <u>not</u> deleted.";
    }

  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
  <title>Sample: Delete Role</title>
</head>
<body>
  <form runat="server" id="PageForm">
    <h3>
      Delete Role</h3>
    <asp:Label ID="Msg" ForeColor="maroon" runat="server" /><br />
    <table border="0">
      <tr>
        <td valign="top">
          Delete Role:</td>
        <td valign="top">
          <asp:ListBox ID="RolesListBox" runat="server" Rows="8" /></td>
        <td valign="top">
          <asp:Button Text="Delete Role" ID="DeleteRoleButton" runat="server" OnClick="DeleteRole_OnClick" /></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(ByVal sender As Object, ByVal args As EventArgs)

    If Not IsPostBack Then
      ' Bind roles to ListBox.

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

  End Sub


  Public Sub DeleteRole_OnClick(ByVal sender As Object, ByVal args As EventArgs)

    Dim delRole As String

    Try
      delRole = RolesListBox.SelectedItem.Value

      Roles.DeleteRole(delRole)

      Msg.Text = "Role '" & Server.HtmlEncode(delRole) & "' deleted."

      ' Re-bind roles to ListBox.

      rolesArray = Roles.GetAllRoles()
      RolesListBox.DataSource = rolesArray
      RolesListBox.DataBind()
    Catch
      Msg.Text = "Role '" & Server.HtmlEncode(delRole) & "' <u>not</u> deleted."
    End Try

  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
  <title>Sample: Delete Role</title>
</head>
<body>
  <form runat="server" id="PageForm">
    <h3>
      Delete Role</h3>
    <asp:Label ID="Msg" ForeColor="maroon" runat="server" /><br />
    <table border="0">
      <tr>
        <td valign="top">
          Delete Role:</td>
        <td valign="top">
          <asp:ListBox ID="RolesListBox" runat="server" Rows="8" /></td>
        <td valign="top">
          <asp:Button Text="Delete Role" ID="DeleteRoleButton" runat="server" OnClick="DeleteRole_OnClick" /></td>
      </tr>
    </table>
  </form>
</body>
</html>

注解

类调用Roles该方法DeleteRole，从 ASP.NET 应用程序的配置文件 (Web.config) 中指定的SQL Server数据库中删除角色。 删除角色后，也会从数据库中删除与该角色关联的用户列表。 数据库中的用户信息不受影响。

true如果是throwOnPopulatedRole，则会引发异常，如果参数标识roleName的角色具有一个或多个成员，则不会删除该角色。 false如果是throwOnPopulatedRole，则无论角色是否为空，都将删除该角色。

适用于

另请参阅