Kendo MVC grid with editable enum column

问题:

I have a simple model that I need to display and edit in Kendo's MVC Grid component.

public class MyModel
{
    public int Id {get; set;}
    public string SomeProperty {get; set;}
    public MyEnum MyEnum {get; set;}
}

public enum MyEnum
{
    FirstItem = 1,
    SecondItem = 2,
    ThirdItem = 3
}

And I have my grid set up like this:

@(Html.Kendo()
    .Grid<MyModel>()
    .Name("grid").Columns(columns =>
    {
        columns.Bound(o => o.SomeProperty).Width(200);
        columns.Bound(o => o.MyEnum).Width(200);
        columns.Command(command =>
        {
            command.Edit().Text("Edit");
        }).Width(220);
    })
    .Editable(editable => editable.Mode(GridEditMode.InLine))
    .DataSource(dataSource => dataSource
        .Ajax()
        .Batch(false)
        .ServerOperation(false)
        .Model(model =>
        {
            model.Id(p => p.Id);
            model.Field(p => p.SomeProperty);
            model.Field(p => p.MyEnum);

        })
        .Create(...) // removed for confidentiality
        .Read(...)
        .Update(...)
        .Events(...)
    ).Filterable()
  .Sortable())

After executing the edit command, I receive updated model in controller's method defined in Update(...).

public virtual async Task<ActionResult> Update(
        [DataSourceRequest] DataSourceRequest request,
        MyModel myModel)

However no matter what I do, myModel in controller has default value of MyEnum. Even if I change just SomeProperty of item that has MyEnum set to SecondItem, it will be FirstItem in the controller. This was verified by looking at the POST request, so the problem is somewhere in the Grid, not on server.

How to do proper data binding to ensure Kendo sends correct MyEnum values?

回答1:

You need to use .ForeignKey() on a column instead of binding:

@(Html.Kendo()
    .Grid<MyModel>()
    .Name("grid").Columns(columns =>
    {
        columns.ForeignKey(o => o.MyEnum, ).EditorTemplateName("GridForeignKey").Width(200);

        // SNIP

and then define GridForeignKey.cshtml in Views/Shared/EditorTemplate like this:

@model object

@{
    var selectList = (SelectList)ViewData[ViewData.TemplateInfo.GetFullHtmlFieldName("") + "_Data"];
}

@Html.DropDownListFor(m => m, selectList, "Choose...")

This way you get a dropdown in your grid and will get correct values into your controller on POST.

回答2:

I had the same problem. You should to use EditorTemplate (MyEnum.cshtml in Shared\EditorTemplates folder) for MyEnum property:

@model MyEnum

@(Html.Kendo().DropDownListFor(m => m)
   .Name("MyEnum")
   .BindTo(EnumHelper.GetSelectList(Model.GetType()))
   .OptionLabel("Please select MyEnum"))

回答3:

There may be a conflict in your model since your enum object property matches the type. Suggest you rename it something like this and give it a try;

public class MyModel
{
    public int Id {get; set;}
    public string SomeProperty {get; set;}
    public MyEnum EnumProperty {get; set;}
}