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POExclude a type from model validation (example DbGeography) to avoid InsufficientExecutionStackException
 

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  1. POExclude a type from model validation (example DbGeography) to avoid InsufficientExecutionStackException
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    <p><strong>UPDATE:</strong> for the tl;dr version skip to the bottom</p> <hr> <p>I have a pretty simple subclass of JsonConverter that I'm using with Web API:</p> <pre><code>public class DbGeographyJsonConverter : JsonConverter { public override bool CanConvert(Type type) { return typeof(DbGeography).IsAssignableFrom(type); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { var value = (string)reader.Value; if (value.StartsWith("POINT", StringComparison.OrdinalIgnoreCase)) { return DbGeography.PointFromText(value, DbGeography.DefaultCoordinateSystemId); } else if (value.StartsWith("POLYGON", StringComparison.OrdinalIgnoreCase)) { return DbGeography.FromText(value, DbGeography.DefaultCoordinateSystemId); } else //We don't want to support anything else right now. { throw new ArgumentException(); } } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { serializer.Serialize(writer, ((DbGeography)value).AsText()); } } </code></pre> <p>The problem is, after <code>ReadJson</code> returns the application never returns a bound object to the action method as it appears to be stuck in an infinite validation loop.</p> <p>Here's the top of the call stack when I pause execution:</p> <blockquote> <p>System.Web.Http.dll!System.Web.Http.Metadata.Providers.AssociatedMetadataProvider.GetMetadataForPropertiesImpl.AnonymousMethod__0() Line 40 C# System.Web.Http.dll!System.Web.Http.Metadata.ModelMetadata.Model.get() Line 85 C# System.Web.Http.dll!System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren(System.Web.Http.Metadata.ModelMetadata metadata, System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext, object container) Line 94 C# System.Web.Http.dll!System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties(System.Web.Http.Metadata.ModelMetadata metadata, System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext) Line 156 C# System.Web.Http.dll!System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren(System.Web.Http.Metadata.ModelMetadata metadata, System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext, object container) Line 130 C# System.Web.Http.dll!System.Web.Http.Validation.DefaultBodyModelValidator.ValidateElements(System.Collections.IEnumerable model, System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext) Line 176 C#</p> </blockquote> <p>After that, the DefaultBodyModelValidator.Validation* pattern of calls repeats over and over and over again. Everytime I pause execution, it appears to be at about the same depth, so it doesn't appear to be getting recursively deeper.</p> <p>If I force the JsonConverter to return <code>null</code>, control returns to the API controller action method, I'm assuming because there's nothing to validate. </p> <p>I don't have the brain juices left to figure this one out. What am I doing wrong?</p> <hr> <p><strong>UPDATE:</strong> With brain juices somewhat replenished, I've stepped through most of the code and it appears that when validating the model the <code>DefaultBodyModelValidator</code> is drilling way down into the <code>SqlTypesAssembly</code> and getting stuck in a loop reading attributes somewhere. I don't really care to find out exactly where because I don't want the <code>DefaultBodyModelValidator</code> drilling into <code>DbGeography</code> type instances to start with.</p> <p>There's no reason for model validation to drill down into the <code>DbGeography</code> class. I need to figure out how to get the <code>MediaTypeFormatterCollection.IsTypeExcludedFromValidation</code> method to return true for <code>typeof(DbGeography)</code>, which will cause the <code>DefaultBodyModelValidator</code> to perform shallow validation on any <code>DbGeography</code> instances. So now the question at hand is- how do I exclude a type from model validation? The <code>ShouldValidateType</code> method of <code>DefaultBodyModelValidator</code> is marked virtual, but is there not a simple way to add an excluded type at startup?</p>
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