如何返回MVC的Web API POST方法的ModelState错误剑道电网？ [英] How to return ModelState errors to Kendo grid in MVC Web API post method?

问题描述

我一直没能找到那里后/更新方法返回验证错误剑道+ MVC的Web API的一个例子。它看起来不像是有剑道的扩展，可以进行以下code的工作。

I haven't been able to find an example of Kendo + MVC Web API where post/update methods return validation errors. It doesn't look like there is a Kendo extension that could make the following code work.

public HttpResponseMessage Post([ModelBinder(typeof(Prototype.WebApi.ModelBinders.DataSourceRequestModelBinder))][DataSourceRequest] DataSourceRequest request, User user)
    {
        if (this.ModelState.IsValid)
        {               
           //save               
        }
        return Request.CreateErrorResponse(HttpStatusCode.BadRequest, this.ModelState.ToDataSourceResult());            
    }

becaue的ModelState在这方面是System.Web.Http.ModelBinding.ModelStateDictionary和剑道扩展期望System.Web.Mvc.ModelStateDictionary。

becaue ModelState in this context is System.Web.Http.ModelBinding.ModelStateDictionary and Kendo extensions expect System.Web.Mvc.ModelStateDictionary.

那么，什么是对来自Web API返回的ModelState错误剑道的最好方式？

So what is the best way to return ModelState errors from Web API to Kendo?

推荐答案

这梦幻般的工作对我们来说，虽然我们从来没有看到的ModelState错误，通常省略部分...

This works fantastic for us, though we never see ModelState errors and usually omit that part...

@model SysMaintViewModel
@(Html.Kendo().Grid<BuildingModel>()
    .Name("BuildingsGrid")
    .Columns(columns =>
    [Stuff Omitted]
    .DataSource(dataSource => dataSource
        .Ajax()
>>>     .Events(e => e.Error("error_handler"))
        .Model(model =>
        {
            model.Id(m => m.Id);
            model.Field(m => m.ProjectId).DefaultValue(Model.ProjectId);
            model.Field(m => m.IsActive).DefaultValue(true);
        })
        .Create(create => create.Action("CreateBuilding", "SysMaint"))
        .Read(read => read.Action("ReadBuildings", "SysMaint", Model))
        .Update(update => update.Action("UpdateBuilding", "SysMaint"))
        .Destroy(destroy => destroy.Action("DestroyBuilding", "SysMaint"))
    )
)

控制器

[HttpPost]
public JsonResult UpdateBuilding([DataSourceRequest]DataSourceRequest request, BuildingModel modelIn)
{
    var building = new BuildingModel();
    if (ModelState.IsValid)
    {
        try
        {
            building = _presentationService.UpdateBuilding(modelIn);
        }
        catch (Exception e)
        {
            ModelState.AddModelError(string.Empty, e.Message);
        }
    }
    else
    {
        var errMsg = ModelState.Values
            .Where(x => x.Errors.Count >= 1)
            .Aggregate("Model State Errors: ", (current, err) => current + err.Errors.Select(x => x.ErrorMessage));
        ModelState.AddModelError(string.Empty, errMsg);
    }
    var buildings = (new List<BuildingModel> {building}).ToDataSourceResult(request, ModelState);
    return Json(buildings, JsonRequestBehavior.AllowGet);
}

已更新控制器

我们已经发现这种流动的工作好一点，并将其添加错误记录到ELMAH（通用例子）...

UPDATED Controller

We have found this flow to work a bit better and it adds error logging to Elmah (generic example)...

[HttpPost]
public JsonResult Update([DataSourceRequest]DataSourceRequest request, MyObjectModel modelIn)
{
    try
    {
        if (ModelState.IsValid)
        {
            var myObject = _presentationService.Update(modelIn, User.Identity.Name);
            var myObjectList = new List<MyObjectModel> { myObject };
            return Json(myObjectList.ToDataSourceResult(request, ModelState), JsonRequestBehavior.AllowGet);
        }
        else
        {
            var myObjectList = new List<MyObjectModel> { modelIn };
            return Json(myObjectList.ToDataSourceResult(request, ModelState), JsonRequestBehavior.AllowGet);
        }
    }
    catch (Exception e)
    {
        Elmah.ErrorSignal.FromCurrentContext().Raise(e);
        ModelState.AddModelError(string.Empty, e.Message);
        var myObjectList = new List<MyObjectModel> { modelIn };
        return Json(myObjectList.ToDataSourceResult(request, ModelState), JsonRequestBehavior.AllowGet);
    }
}

常见的JavaScript和剑道窗口

@(Html.Kendo().Window()
    .Name("alertWindow")
    .Title("Status Message from Server")
    .Draggable()
    .Resizable()
    .Width(400)
    .Height(200)
    .Modal(true)
    .Visible(false)
)
function showAlertWindow(message) {
    var alertWindow = $('#alertWindow').data('kendoWindow');
    alertWindow.content(message);
    alertWindow.refresh();
    alertWindow.center();
    alertWindow.open();
}
function error_handler(e) {
    if (e.errors) {
        var message = "Errors:\n";
        $.each(e.errors, function (key, value) {
            if ('errors' in value) {
                $.each(value.errors, function () {
                    message += this + "\n";
                });
            }
        });
        showAlertWindow(message);
    }
}

加成

我们的BaseModel也有我们把其他类型的错误的参数的ErrorMessage将在页面加载来检查，如果同样的警告窗口应该打开其他的事。

Bonus

Our BaseModel also has an ErrorMessage parameter that we put other types of errors into that checks on page load if the same alert window should be opened for anything else.

$(document).ready(function () {
    if ("@Model.ErrorMessage" != "") {
        showAlertWindow("@Model.ErrorMessage");
    }
});

这有时抛出的错误一个很不错的presentation - 使我们的内部用户吓坏了。我希望这可以帮助你。

This has a very nice presentation when an error is thrown - keeps our in-house users from freaking out. I hope this helps you out.

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