标签: asp.net-core-mvc

我有一种方法是调用 api 方法。该 api 方法包含插入、更新、删除的 SQL 语句。但是当存储过程抛出任何错误时，如何在前面显示为错误消息。我正在使用 ASP .NET 5 和 MVC 6。我的方法如下：

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Method(Model model)
{
    string url = ConfigurationSettingHelper.BaseUrl + "apiurl";

    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri(url);
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

        HttpResponseMessage response = await client.PostAsJsonAsync<Model>(url, model);

        if (response.IsSuccessStatusCode)
        {
            var data = await response.Content.ReadAsStringAsync();
            var Msg = Newtonsoft.Json.JsonConvert.DeserializeObject<string>(data);

            if (!string.IsNullOrEmpty(Convert.ToString(Msg)))
            {
                //Here code to display error message.
            }
        }
    }
    return View();
}

帮助我在页面上显示 Msg 变量字符串消息。

谢谢你

我想在 MVC-6 RC2 中使用自定义 jquery 不显眼的验证器

与旧答案类似，我在This one 中看到了一些 RC2 示例，但我不知道如何为文件实现它。

这是我的查看模式

public class FileUploadViewModel
    {
        //TODO [FileType(Validtype="jpeg,png,jif", MaxSize=112222)]// this is what I want
        [Required(ErrorMessage = "Please select a file")]
        public IFormFile File { get; set; }

        [Required(ErrorMessage = "Please select link")]
        public string FileName { get; set; }

        public string ExternalLink { get; set; }

        public string Description { get; set; }    
    }

根据内联文档,ControllerBase.RedirectToAction获取操作名称和控制器名称:

// Parameters:
//   actionName:
//     The name of the action.
//
//   controllerName:
//     The name of the controller.
public virtual RedirectToActionResult RedirectToAction(string actionName, string controllerName);

现在,让我们假设我想重定向到以下操作:

[Route("Whatever")]
public class WhateverController : Controller
{
    [HttpGet("Overview")]
    public IActionResult Overview()
    {
        return View();
    }
}

当然,我想使用nameof运算符":

[Route("Home")]
public class HomeController : Controller
{
    [HttpGet("Something")]
    public IActionResult Something()
    {
        return RedirectToAction(
            nameof(WhateverController.Overview), // action name
            nameof(WhateverController) // controller name
        );
    }
}

但是这个调用因错误而失败 InvalidOperationException: No route matches the …

我正在尝试渲染一个链接列表,图标应该根据是否找到项目ID而改变IEnumerable.

到目前为止,这是我观点的相关部分:

@{
if (product.InFrontPages.Contains(item.ParentCategory.Id))
    {
        <span class="glyphicon glyphicon-checked"></span>
    }
    else
    {
        <span class="glyphicon glyphicon-unchecked"></span>
    }
}

这会导致编译时错误:

'IEnumerable'不包含'Contains'的定义,并且最好的扩展方法重载'ParallelEnumerable.Contains(ParallelQuery,int)'需要一个'ParallelQuery'类型的接收器

我想我可能想要实现这个问题的公认答案,但我还没想出怎么做.当他建议实现通用接口时,我不明白Jon的意思.

涉及的视图模型:

public class ViewModelProduct
{
    public int Id { get; set; }
    public string Title { get; set; }
    public string Info { get; set; }
    public decimal Price { get; set; }
    public int SortOrder { get; set; }
    public IEnumerable<FrontPageProduct> InFrontPages { get; set; }
    public IEnumerable<ViewModelCategoryWithTitle> Categories { get; set; }
}

    public …

我找不到任何关于此的细节,但我遇到的问题是,如果Validate调用在任何子属性上失败,则不会调用父对象的Validate函数.简单场景如下:

public class Child : IValidateObject 
{
    public IEnumerable<ValidationResult> Validate(ValidationContext  validationContext)
    { ... } 
}

public class Parent : IValidatableObject
{ 
    public Child Child { get; set;}
    public IEnumerable<ValidationResult> Validate(ValidationContext  validationContext)
    { ... } 
}

如果子级中的验证失败,则父级的Validate函数不会被调用,因此您最终必须首先解决所有子问题然后提交,然后才会看到父级的所有验证失败.

如果有人可以帮助我理解为什么会这样,或者指出一些有关这方面的文件会很棒.

我的ASP.NET Core Web项目具有通常的共享布局文件。

如何排除特定页面使用的布局？

我试图从下拉列表中清除所选值,但值仍然是持久的.这是使用相同的行为@Html.DropDownListFor

调节器

public class HomeController : Controller
{

    [Route("/Home/Index")]
    [Route("/Home/Index/{Category}")]
    [Route("/Home/Index/{Category}/{Type}")]
    public IActionResult Index(HomeModel model)
    {
        // Issue is here
        // for url: home/index/accessories/test
        // "Category" is cleared if it is not valid "type"
        // but still "Accessories" remains selected in the drop down
        if (model.Type != "Electronics" && model.Type != "Furniture")
        {
            model.Category = string.Empty;
        }

        return View(new HomeModel() { Category = model.Category, Type = model.Type });
    }

视图

@model WebApplication1.Controllers.HomeModel

<select asp-for="Category" asp-items="@Model.Categories"></select>
<select asp-for="Type" asp-items="@Model.Types"></select>

模型 …

假设我想编写自己的Login,Logout端点及其Views

但出于某种原因,我正努力去除现有的端点

每当我删除可能与这些端点关联的内容时,它们都会重新创建并返回其默认视图.

基本上我想删除从ASP.NET Core Identity生成的那些默认端点/视图

关于如何实现这一点的任何想法？

        "Templates/Identity/Pages/Account/Account.AccessDenied.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.AccessDenied.cshtml",
        "Templates/Identity/Pages/Account/Account.ConfirmEmail.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.ConfirmEmail.cshtml",
        "Templates/Identity/Pages/Account/Account.ExternalLogin.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.ExternalLogin.cshtml",
        "Templates/Identity/Pages/Account/Account.ForgotPassword.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.ForgotPassword.cshtml",
        "Templates/Identity/Pages/Account/Account.ForgotPasswordConfirmation.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.ForgotPasswordConfirmation.cshtml",
        "Templates/Identity/Pages/Account/Account.Lockout.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.Lockout.cshtml",
        "Templates/Identity/Pages/Account/Account.Login.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.Login.cshtml",
        "Templates/Identity/Pages/Account/Account.LoginWith2fa.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.LoginWith2fa.cshtml",
        "Templates/Identity/Pages/Account/Account.LoginWithRecoveryCode.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.LoginWithRecoveryCode.cshtml",
        "Templates/Identity/Pages/Account/Account.Logout.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.Logout.cshtml",
        "Templates/Identity/Pages/Account/Account.Register.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.Register.cshtml",
        "Templates/Identity/Pages/Account/Account.ResetPassword.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.ResetPassword.cshtml",
        "Templates/Identity/Pages/Account/Account.ResetPasswordConfirmation.cs.cshtml",
        "Templates/Identity/Pages/Account/Account.ResetPasswordConfirmation.cshtml",
        "Templates/Identity/Pages/Account/Account._ViewImports.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ChangePassword.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ChangePassword.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.DeletePersonalData.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.DeletePersonalData.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.Disable2fa.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.Disable2fa.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.DownloadPersonalData.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.DownloadPersonalData.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.EnableAuthenticator.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.EnableAuthenticator.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ExternalLogins.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ExternalLogins.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.GenerateRecoveryCodes.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.GenerateRecoveryCodes.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.Index.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.Index.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ManageNavPages.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.PersonalData.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.PersonalData.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ResetAuthenticator.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ResetAuthenticator.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.SetPassword.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.SetPassword.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ShowRecoveryCodes.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.ShowRecoveryCodes.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.TwoFactorAuthentication.cs.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage.TwoFactorAuthentication.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage._Layout.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage._ManageNav.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage._StatusMessage.cshtml",
        "Templates/Identity/Pages/Account/Manage/Account.Manage._ViewImports.cshtml",
        (...)

我的下拉列表有问题。它始终为空，即使在调试时，列表中有4个不同的条目也在asp-items中设置，如下所示：

https://imgur.com/a/CYZSO5z

我究竟做错了什么？

ViewModel：

public IEnumerable<SelectListItem> SelectRole { get; set; }

public string RoleId { get; set; }

控制器：

 model.SelectRole = _roleManager.Roles?.Select(s => new SelectListItem
 {
     Value = s.Id,
     Text = s.Name
 });

视图：

<select asp-for="RoleId" asp-items="@Model.SelectRole" class="form-control" />

在index.cshtml中，我使用锚标记助手作为

<a asp-action="Edit" asp-route-id="@Model.Id" asp-route-firstname="@Model.Name"</a>

并在动作方法中

public IActionResult Edit(string id, string firstname)
{
   // id and firstname are assigned correct values
   // but  RouteData.Values only has three entries which are: controller, action and id, where is firstname?
}

但是我不能通过访问访问firstname值，RouteData.Values["firstname"];而可以通过访问id值RouteData.Values["id"];，为什么它对id有效但对其他自定义属性无效？