asp.net-core – userManager.FindByName不返回角色

我试图加载角色,等待userManager.GetRolesAsync(user);我得到数量为3的数组.这意味着用户有角色.

我不知道改变了什么,但是如何使用FindByNameAsync函数加载具有角色的用户？

完整代码：

[HttpPost("token"),Produces("application/json")]
public async Task<IActionResult> Exchange(OpenIdConnectRequest request)
{
    Debug.Assert(request.IsTokenRequest(),"The OpenIddict binder for ASP.NET Core MVC is not registered. " +
        "Make sure services.AddOpenIddict().AddMvcBinders() is correctly called.");

    if (request.IsPasswordGrantType())
    {
        var user = await userManager.FindByNameAsync(request.Username);  //roles count is 0
        if (user == null)
        {
            return BadRequest(new OpenIdConnectResponse
            {
                Error = OpenIdConnectConstants.Errors.InvalidGrant,ErrorDescription = "The email/password couple is invalid."
            });
        }
        var roles = await userManager.GetRolesAsync(user);  //roles count is 3