public async Task <IdentityResult> UpdateRolesAsync(User user, List <string> roles)
{
if (user == null)
{
throw new ArgumentNullException(nameof(user));
}
if (roles == null)
{
throw new ArgumentNullException(nameof(roles));
}
// 移除旧的角色数据
var oldRoles = await GetRolesAsync(user);
if (oldRoles != null)
{
foreach (var role in oldRoles)
{
await _userStore.RemoveFromRoleAsync(user, role, CancellationToken);
}
}
// 增加指定的角色数据
foreach (var role in roles)
{
await _userStore.AddToRoleAsync(user, role, CancellationToken);
}
return(await UpdateUserAsync(user));
}