注意：此方法在 .NET Framework 2.0 版中是新增的。
获取一个值，指示指定用户是否属于已配置的
applicationName 的指定角色。
命名空间:System.Web.Security
程序集:System.Web（在 system.web.dll 中）
Public MustOverride Function IsUserInRole ( _
username As String, _
roleName As String _
) As Boolean
Dim instance As RoleProvider
Dim username As String
Dim roleName As String
Dim returnValue As Boolean
returnValue = instance.IsUserInRole(username, roleName)
public abstract bool IsUserInRole (
string username,
string roleName
)
public:
virtual bool IsUserInRole (
String^ username,
String^ roleName
) abstract
public abstract boolean IsUserInRole (
String username,
String roleName
)
public abstract function IsUserInRole (
username : String,
roleName : String
) : boolean
参数
- username
要搜索的用户名。
- roleName
作为搜索范围的角色。
返回值
如果指定用户属于已配置的 applicationName 的指定角色，则为 true；否则为 false。
IsUserInRole 方法由 Roles 类的 IsUserInRole 方法和 RolePrincipal 类的 IsInRole 方法调用，以确定当前登录用户是否与数据源中已配置的 ApplicationName 的某个角色相关联。
如果指定的用户名为 空引用（在 Visual Basic 中为 Nothing） 或是空字符串，则建议提供程序引发异常。
如果指定的角色名为 空引用（在 Visual Basic 中为 Nothing） 或是空字符串，则建议提供程序引发异常。
下面的代码示例演示 IsUserInRole 方法的示例实现。
Public Overrides Function IsUserInRole(username As String, rolename As String) As Boolean
If username Is Nothing OrElse username = "" Then _
Throw New ProviderException("User name cannot be empty or null.")
If rolename Is Nothing OrElse rolename = "" Then _
Throw New ProviderException("Role name cannot be empty or null.")
Dim userIsInRole As Boolean = False
Dim conn As OdbcConnection = New OdbcConnection(connectionString)
Dim cmd As OdbcCommand = New OdbcCommand("SELECT COUNT(*) FROM [" & usersInRolesTable & "]" & _
" WHERE Username = ? AND Rolename = ? AND ApplicationName = ?", conn)
cmd.Parameters.Add("@Username", OdbcType.VarChar, 255).Value = username
cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename
cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName
Try
conn.Open()
Dim numRecs As Integer = CType(cmd.ExecuteScalar(), Integer)
If numRecs > 0 Then
userIsInRole = True
End If
Catch e As OdbcException
' Handle exception.
Finally
conn.Close()
End Try
Return userIsInRole
End Function
public override bool IsUserInRole(string username, string rolename)
{
if (username == null || username == "")
throw new ProviderException("User name cannot be empty or null.");
if (rolename == null || rolename == "")
throw new ProviderException("Role name cannot be empty or null.");
bool userIsInRole = false;
OdbcConnection conn = new OdbcConnection(connectionString);
OdbcCommand cmd = new OdbcCommand("SELECT COUNT(*) FROM [" + usersInRolesTable + "]" +
" WHERE Username = ? AND Rolename = ? AND ApplicationName = ?", conn);
cmd.Parameters.Add("@Username", OdbcType.VarChar, 255).Value = username;
cmd.Parameters.Add("@Rolename", OdbcType.VarChar, 255).Value = rolename;
cmd.Parameters.Add("@ApplicationName", OdbcType.VarChar, 255).Value = ApplicationName;
try
{
conn.Open();
int numRecs = (int)cmd.ExecuteScalar();
if (numRecs > 0)
{
userIsInRole = true;
}
}
catch (OdbcException)
{
// Handle exception.
}
finally
{
conn.Close();
}
return userIsInRole;
}
Windows 98、Windows 2000 SP4、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
.NET Framework
受以下版本支持：2.0