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Asp.net MVC5為什么Html.ValidationSummary(false)不顯示異常錯誤?

[英]Asp.net MVC5 Why won't Html.ValidationSummary(false) display exception errors?

我正在嘗試讓我正在建立的asp.net mvc5網站上的用戶帳戶管理工作。 新用戶的創建基本上可以正常工作,但是在創建用戶期間引發異常時,顯示錯誤會出現問題。 捕獲/處理了異常,並且在我的AdminController的Create()操作中向ModelState對象添加了錯誤消息,但是當我返回到Create視圖時,不會顯示該錯誤。

不會導致引發異常的其他類型的用戶創建錯誤可以正確顯示。 附帶說明,發生問題時,瀏覽器上的“旋轉器”永遠不會停止,這表明發起create動作的帖子從未完成。 如果單擊瀏覽器中的菜單,則導航到新頁面,微調框消失。

在以下情況下會出現正確顯示且與異常無關的Create()錯誤:

var newUserCreateResult = UserManager.Create(newUser, password)

返回:

newUserCreateResult.Succeeded == false

與異常相關聯且無法正確顯示的create()錯誤在以下情況下發生:

await UserManager.SendEmailAsync(newUser.Id, "Reset Password", "Please confirm your account and reset your password by clicking <a href=\"" + callbackUrl + "\">here</a>");

引發異常。 我使用的是SmtpMailService,當無法訪問電子郵件服務器或smtp帳戶配置不正確時,將引發異常。

我嘗試過的一些事情:

  1. @ Html.ValidationSummary(true)
  2. 通過遍歷“創建”視圖中的ModelState錯誤來手動創建錯誤列表。 調試器指示代碼已執行,但仍不顯示。

我的Create()動作:

        // PUT: /Admin/Create
    [Authorize(Roles = "Admin")]
    [HttpPost]
    [ValidateAntiForgeryToken]
    #region public ActionResult Create(CreateUserDTO createUserDTO)
    public async Task<ActionResult> Create(CreateUserDTO createUserDTO) {
        ApplicationUser newUser = null;
        try {
            if (createUserDTO == null) {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }

            var Email = createUserDTO.Email.Trim();
            if (Email == "") {
                throw new Exception("No Email");
            }
            // Create user
            newUser = new ApplicationUser { UserName = Email, Email = Email };
            var password = Membership.GeneratePassword(8, 3) + "aaZZ09";
            var newUserCreateResult = UserManager.Create(newUser, password);

            if (newUserCreateResult.Succeeded == true) {
                UserManager.AddToRole(newUser.Id, createUserDTO.SelectedRole);
                string code = await UserManager.GeneratePasswordResetTokenAsync(newUser.Id);
                code = HttpUtility.UrlEncode(code);
                var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = newUser.Id, code = code }, protocol: Request.Url.Scheme);
                await UserManager.SendEmailAsync(newUser.Id, "Reset Password", "Please confirm your account and reset your password by clicking <a href=\"" + callbackUrl + "\">here</a>");

                return Redirect("~/Admin");
            } else {
                // Html.ValidationSummary displays these errors correctly
                foreach (string msg in newUserCreateResult.Errors) {
                    ModelState.AddModelError(string.Empty, msg);
                }
            }
        } catch (Exception ex) {
            // Html.ValidationSummary DOESN NOT display these errors
            ModelState.AddModelError(string.Empty, ex.Message);
        }
        if (newUser != null) {
            UserManager.Delete(newUser);
        }
        createUserDTO.Roles = GetAllRolesAsSelectList();
        return View("Create", createUserDTO);
    }

我的Create.cshtml視圖:

    @model Nissan.Models.CreateUserDTO
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
@using (Html.BeginForm("Create", "Admin", FormMethod.Post, new { @class = "form-horizontal", role = "form" })) {
    @Html.AntiForgeryToken()
    <div class="form-horizontal">
        <h4>Create User</h4>
        <hr />
        @Html.ValidationSummary(false, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.Email,
           htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Email,
               new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Email, "",
               new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Roles,
           htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownListFor(model => model.SelectedRole, (Model == null) ? null : Model.Roles);
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
                @Html.ActionLink("Cancel",
               "Index",
               null,
               new { @class = "btn btn-default" })
            </div>
        </div>
    </div>
}

這個問題神秘地消失了(在重新啟動PC后?)。 現在,它應該按照異常發布錯誤。

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