c# - Error when trying to set up custom validation in MVC 5

Question

I get the error message "The controller for path '/ItemController/IsAssetAvailable' was not found or does not implement IController" when trying to submit my form that has the custom validation set for it in the model using DataAnnotations.

Controller Layout:

Controller Code:

public ActionResult IsAssetAvailable(string Asset_Tag_Nbr)
    {
        using (db)
        {
            try
            {
                var asset = db.Items.Single(i => i.Asset_Tag_Nbr == Asset_Tag_Nbr);
                return Json(false, JsonRequestBehavior.AllowGet);
            }
            catch (Exception)
            {
                return Json(true, JsonRequestBehavior.AllowGet);
            }
        }
    }

Data Annotations:

[Display(Name = "Asset Tag #")]
[Remote("IsAssetAvailable", "ItemController", ErrorMessage = "Asset # already exists.")]
public string Asset_Tag_Nbr { get; set; }

View:

<div class="form-group col-sm-4">
     @Html.LabelFor(model => model.Asset_Tag_Nbr, new { @class = "control-label col-md-12" })
     <div class="col-md-10">
         @Html.EditorFor(model => model.Asset_Tag_Nbr, new { htmlAttributes = new { @class = "form-control" } })
         @Html.ValidationMessageFor(model => model.Asset_Tag_Nbr)
     </div>
</div>

标签： c#asp.net-mvcasp.net-mvc-5

Answer 1

问题似乎来自内部声明的控制器名称，RemoteAttribute如下所示：

[Remote("IsAssetAvailable", "ItemController", ErrorMessage = "Asset # already exists.")]
public string Asset_Tag_Nbr { get; set; }

您正在使用RouteAttribute 2 个重载：

public RemoteAttribute (string action, string controller)

参数是控制器名称，包含对应的controller动作方法名称，不带Controller后缀。因此，您应该使用RouteAttribute如下示例的参数：

[Display(Name = "Asset Tag #")]
[Remote("IsAssetAvailable", "Item", ErrorMessage = "Asset # already exists.")]
public string Asset_Tag_Nbr { get; set; }

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