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POMVC 3: HtmlHelper.TextBoxFor(Expression<Func<MyModel,double?>>) Failing
 

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    <p>Ok, so we've been converting an old project to .NET 4 and MVC 3, and it is mostly finished. I am now, however, receiving an error on a partial view when calling <code>HtmlHelper.TextBoxFor(Expression&lt;Func&lt;MyModel,double?&gt;&gt;)</code>. <code>HtmlHelper.TextBoxFor(Expression&lt;Func&lt;MyModel,string&gt;&gt;)</code> works just fine, however.</p> <p>Here are the relevant code snippets:</p> <p>A model class:</p> <pre><code>public class MyClass { public string SomeString { get; set; } public double? SomeNullableDouble { get; set; } } </code></pre> <p>In the main view ViewModel:</p> <pre><code>public class MyMainViewModel { public MyClass A { get; set; } public MyClass B { get; set; } } </code></pre> <p>In the Partial View ViewModel:</p> <pre><code>public class MyPartialViewModel { public Expression&lt;Func&lt;MyMainViewModel, string&gt;&gt; SomeStringProperty { get; set; } public Expression&lt;Func&lt;MyMainViewModel, double?&gt;&gt; SomeNullableDoubleProperty { get; set; } public MyPartialViewModel(Expression&lt;Func&lt;AnalyzeCostViewModel, string&gt;&gt; someStringProperty, Expression&lt;Func&lt;AnalyzeCostViewModel, double?&gt;&gt; someNullableDoubleProperty) { SomeStringProperty = someStringProperty; SomeNullableDoubleProperty = someNullableDoubleProperty; } } </code></pre> <p>In the Main View (We haven't bothered converting to Razor views just yet...):</p> <pre><code>&lt;div&gt; &lt;% Html.RenderPartial("MyPartialView", new MyPartialViewModel(m =&gt; m.A.SomeString, m =&gt; m.A.SomeNullableDouble)) %&gt; &lt;/div&gt; &lt;div&gt; &lt;% Html.RenderPartial("MyPartialView", new MyPartialViewModel(m =&gt; m.B.SomeString, m =&gt; m.B.SomeNullableDouble)) %&gt; &lt;/div&gt; </code></pre> <p>In the Partial View (MyPartialView.ascx):</p> <pre><code>&lt;p&gt; &lt;%=Model.Helper.LabelFor(Model.SomeStringProperty, "SomeLabel:") %&gt; &lt;%=Model.Helper.TextBoxFor(Model.SomeStringProperty)%&gt; &lt;%=Model.Helper.TextBoxFor(Model.SomeNullableDoubleProperty , new { @class = "some-class" })%&gt; &lt;/p&gt; </code></pre> <p>When trying to access the main view, I'm getting a compiler error:</p> <p>Server Error in '\' Application.</p> <p>Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.</p> <p>[InvalidOperationException: Templates can be used only with field access, property access, single-dimension array index, or single-parameter custom indexer expressions.] System.Web.Mvc.ModelMetadata.FromLambdaExpression(Expression<code>1 expression, ViewDataDictionary</code>1 viewData) +522 System.Web.Mvc.Html.InputExtensions.TextBoxFor(HtmlHelper<code>1 htmlHelper, Expression</code>1 expression, IDictionary<code>2 htmlAttributes) +59 System.Web.Mvc.Html.InputExtensions.TextBoxFor(HtmlHelper</code>1 htmlHelper, Expression`1 expression) +50 ASP.views_(proprietary)._<em>Render</em>_control1(HtmlTextWriter __w, Control parameterContainer) in d:(proprietary)MyPartialView.ascx:37 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +109 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Control.Render(HtmlTextWriter writer) +10 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +208 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +8 System.Web.UI.Page.Render(HtmlTextWriter writer) +29 System.Web.Mvc.ViewPage.Render(HtmlTextWriter writer) +43 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +100 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3060</p> <p>The error occurs in the partial view for the nullable double property expression, but not the string one.</p> <p>Is there an easy fix for this? Or is this something that will take some time to redesign?</p>
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    1. COMaybe I'm missing something here, but why are you exposing those `Expression` references in `MyPartialViewModel`? Do you really think there is a real need to do it this way? Don't you think it would be easier passing a simple, regular object reference to the partial view?
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    2. COI won't go into too much detail about why, but it is done that way for a reason (I stripped down the source code to remove all proprietary information). It worked prior to upgrading to MVC 3 (or maybe 2? I'm going straight from 1 => 3.)
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