Correct, idiomatic way to use custom editor templates with IEnumerable models in ASP.NET MVC

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After discussion with Erik Funkenbusch, which led to looking into the MVC source code, it would appear there are two nicer (correct and idiomatic?) ways to do it.

Both involve providing correct html name prefix to the helper, and generate HTML identical to the output of the default EditorFor.

I’ll just leave it here for now, will do more testing to make sure it works in deeply nested scenarios.

For the following examples, suppose you already have two templates for OrderLine class: OrderLine.cshtml and DifferentOrderLine.cshtml.

Method 1 – Using an intermediate template for IEnumerable<T>

Create a helper template, saving it under any name (e.g. “ManyDifferentOrderLines.cshtml”):

@model IEnumerable<OrderLine>

@{
    int i = 0;

    foreach (var line in Model)
    { 
        @Html.EditorFor(m => line, "DifferentOrderLine", "[" + i++ + "]")
    }
}

Then call it from the main Order template:

@model Order

@Html.EditorFor(m => m.Lines, "ManyDifferentOrderLines")

Method 2 – Without an intermediate template for IEnumerable<T>

In the main Order template:

@model Order

@{
    int i = 0;

    foreach (var line in Model.Lines)
    {
        @Html.EditorFor(m => line, "DifferentOrderLine", "Lines[" + i++ + "]")
    }
}

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