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Roles.RemoveUserFromRole(String, String) Method

  • Reference

Definition

Namespace:
System.Web.Security
Assembly:
System.Web.dll

Removes the specified user from the specified role.

C# 
public static void RemoveUserFromRole(string username, string roleName);

Parameters

username
String

The user to remove from the specified role.

roleName
String

The role to remove the specified user from.

Exceptions

ArgumentNullException

roleName is null.

-or-

username is null.

ArgumentException

roleName is an empty string or contains a comma (,)

username is an empty string or contains a comma (,).

ProviderException

Role management is not enabled.

Examples

The following code example removes a user from a role. For an example of a Web.config file that enables role management, see Roles.

ASP.NET (C#) 

<%@ 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;
  MembershipUserCollection users;
  string[] usersInRole;

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

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

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

      // Bind users to ListBox.

      users = Membership.GetAllUsers();
      UsersListBox.DataSource = users;
      UsersListBox.DataBind();
    }

    if (RolesListBox.SelectedItem != null)
    {
      // Show users in role. Bind user list to GridView.

      usersInRole = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value);
      UsersInRoleGrid.DataSource = usersInRole;
      UsersInRoleGrid.DataBind();
    }
  }


  public void AddUsers_OnClick(object sender, EventArgs args)
  {
    // Verify that a role is selected.

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


    // Verify that at least one user is selected.

    if (UsersListBox.SelectedItem == null)
    {
      Msg.Text = "Please select one or more users.";
      return;
    }


    // Create list of users to be added to the selected role.

    string[] newusers = new string[UsersListBox.GetSelectedIndices().Length];

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


    // Add the users to the selected role.

    try
    {
      Roles.AddUsersToRole(newusers, RolesListBox.SelectedItem.Value);

      // Re-bind users in role to GridView.

      usersInRole = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value);
      UsersInRoleGrid.DataSource = usersInRole;
      UsersInRoleGrid.DataBind();
    }
    catch (Exception e)
    {
      Msg.Text = e.Message;
    }
  }


  public void UsersInRoleGrid_RemoveFromRole(object sender, GridViewCommandEventArgs args)
  {
    // Get the selected user name to remove.

    int index = Convert.ToInt32(args.CommandArgument);

    string username = ((DataBoundLiteralControl)UsersInRoleGrid.Rows[index].Cells[0].Controls[0]).Text;


    // Remove the user from the selected role.

    try
    {
      Roles.RemoveUserFromRole(username, RolesListBox.SelectedItem.Value);
    }
    catch (Exception e)
    {
      Msg.Text = "An exception of type " + e.GetType().ToString() +
                 " was encountered removing the user from the role.";
    }


    // Re-bind users in role to GridView.

    usersInRole = Roles.GetUsersInRole(RolesListBox.SelectedItem.Value);
    UsersInRoleGrid.DataSource = usersInRole;
    UsersInRoleGrid.DataBind();
  }



</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" runat="server" Rows="8" AutoPostBack="true" /></td>
        <td valign="top">
          Users:</td>
        <td valign="top">
          <asp:ListBox ID="UsersListBox" DataTextField="Username" Rows="8" SelectionMode="Multiple"
            runat="server" /></td>
        <td valign="top">
          <asp:Button Text="Add User(s) to Role" ID="AddUsersButton" runat="server" OnClick="AddUsers_OnClick" /></td>
      </tr>
      <tr>
        <td valign="top">
          Users In Role:</td>
        <td valign="top">
          <asp:GridView runat="server" CellPadding="4" ID="UsersInRoleGrid" AutoGenerateColumns="false"
            GridLines="None" CellSpacing="0" OnRowCommand="UsersInRoleGrid_RemoveFromRole">
            <HeaderStyle BackColor="navy" ForeColor="white" />
            <Columns>
              <asp:TemplateField HeaderText="User Name" >
                <ItemTemplate>
                  <%# Container.DataItem.ToString() %>
                </ItemTemplate>
              </asp:TemplateField>
              <asp:ButtonField Text="Remove From Role" ButtonType="Link" />
            </Columns>
          </asp:GridView>
        </td>
      </tr>
    </table>
  </form>
</body>
</html>

Remarks

The RemoveUserFromRole method calls the default role provider to remove the specified user from the specified role at the data source.

Applies to

Product Versions
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

See also