Complex models and partial views – model binding issue in ASP.NET MVC 3

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Instead of:

@Html.Partial("_SimplePartial", Model.Simple)

I would recommend you using Editor templates:

@model ComplexModel
@using (Html.BeginForm()) 
{
    @Html.EditorFor(x => x.Simple)
    <input type="submit" value="Save" />
}

and then put the simple partial inside ~/Views/Shared/EditorTemplates/SimpleModel.cshtml or inside ~/Views/Home/EditorTemplates/SimpleModel.cshtml where Home is the name of your controller:

@model SimpleModel
@Html.LabelFor(model => model.Status)
@Html.EditorFor(model => model.Status)

Of course if you prefer to have the partial in some special location and not follow the conventions (why would you?) you could specify the location:

@Html.EditorFor(x => x.Simple, "~/Views/SomeUnexpectedLocation/_SimplePartial.cshtml")

then everything will come into place as expected.

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