Roles.DeleteRole 方法

参考

定义

命名空间:: System.Web.Security

程序集:: System.Web.dll

重要

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从数据源移除一个角色。

重载

DeleteRole(String, Boolean)	从数据源移除一个角色。
DeleteRole(String)	从数据源移除一个角色。

DeleteRole(String, Boolean)

从数据源移除一个角色。

public:
 static bool DeleteRole(System::String ^ roleName, bool throwOnPopulatedRole);

public static bool DeleteRole (string roleName, bool throwOnPopulatedRole);

static member DeleteRole : string * bool -> bool

Public Shared 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。

Boolean

如果从数据源中删除 roleName，则为 true；否则为 false。

例外

ArgumentNullException

roleName 为 null。

ArgumentException

roleName 是一个空字符串。

ProviderException

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

或 -

未启用角色管理。

示例

下面的代码示例从数据源中删除角色。有关启用角色管理的Web.config文件的示例，请参阅 Roles。


<%@ 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

该方法 DeleteRole 从数据源中删除角色名称。 DeleteRole DeleteRole调用默认角色提供程序的方法，以从数据源中删除指定的角色。

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。

另请参阅

了解 ASP.NET 角色管理

适用于

DeleteRole(String)

从数据源移除一个角色。

public:
 static bool DeleteRole(System::String ^ roleName);

public static bool DeleteRole (string roleName);

static member DeleteRole : string -> bool

Public Shared Function DeleteRole (roleName As String) As Boolean

参数

roleName: String

要删除的角色的名称。

Boolean

如果从数据源中删除 roleName，则为 true；否则为 false。

例外

ArgumentNullException

roleName 为 null。

ArgumentException

roleName 为空字符串或者包含逗号 (,)。

ProviderException

roleName 具有一个或多个成员。

或 -

未启用角色管理。

示例

下面的代码示例从数据源中删除角色。有关启用角色管理的Web.config文件的示例，请参阅 Roles。


<%@ 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

该方法 DeleteRole 从数据源中删除角色名称。 DeleteRole DeleteRole调用默认角色提供程序的方法，以从数据源中删除指定的角色。

如果参数标识的角色 roleName 具有一个或多个成员，则会引发异常，并且不会删除该角色。

另请参阅

了解 ASP.NET 角色管理

适用于

Roles.DeleteRole 方法

定义

重载

DeleteRole(String, Boolean)

参数

返回

例外

示例

注解

另请参阅

适用于

DeleteRole(String)

参数

返回

例外

示例

注解

另请参阅

适用于

其他资源