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POMVC Custom Validation Attribute being overwritten by Default ModelValidater..The Value "null" is not valid
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  1. POMVC Custom Validation Attribute being overwritten by Default ModelValidater..The Value "null" is not valid
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    copied!<p>I have a model with some bool objects </p> <pre><code> [DisplayName("Is student still at school")] //[ValidBoolDropDown("IsStillAtSchool")] public bool? IsStillAtSchool { get; set; } </code></pre> <p>that are being implemented with some bool editor dropdown templates </p> <pre><code> @model bool? @{ int intTabIndex = 1; if (ViewData["tabindex"] != null) { intTabIndex = Convert.ToInt32(ViewData["tabindex"]); } } @{ string strOnChange = ""; if (ViewData["onchange"] != null) { strOnChange = ViewData["onchange"].ToString(); } } &lt;div class="editor-field"&gt; @Html.LabelFor(model =&gt; model): @Html.DropDownListFor(model =&gt; model, new SelectListItem[] { new SelectListItem() { Text = "Yes", Value = "true", Selected = Model == true ? true : false }, new SelectListItem() { Text = "No", Value = "false", Selected = Model == false ? true : false }, new SelectListItem() { Text = "Select", Value = "null", Selected = Model == null ? true : false} }, new { @tabindex = intTabIndex, @onchange = strOnChange }) @Html.ValidationMessageFor(model =&gt; model) &lt;/div&gt; </code></pre> <p>On the post I still get the default model validation error </p> <p>The value 'null' is not valid for Is studentstill at school.(aka IsStillatSchool)</p> <p>I have even implemented a custom ValidationAttribute </p> <pre><code>public class ValidBoolDropDown : ValidationAttribute { public ValidBoolDropDown(string dropdownname) :base("Please Select for {0}") { DropDownName = dropdownname; } private string DropDownName; protected override ValidationResult IsValid(object value,ValidationContext validationContext) { var boolres = GetBool(validationContext); //if (!boolres.HasValue) //{ // return new ValidationResult(FormatErrorMessage(validationContext.DisplayName)); //} return ValidationResult.Success; } public override string FormatErrorMessage(string name) { return string.Format(ErrorMessageString, name); } protected bool? GetBool(ValidationContext validationContext) { var propertyInfo = validationContext .ObjectType .GetProperty(DropDownName); if (propertyInfo != null) { var boolValue = propertyInfo.GetValue(validationContext.ObjectInstance, null); if (boolValue == null) return null; return boolValue as bool?; } return null; } } </code></pre> <p>This fires but gets overwritten and the Model.Value.Error for this attribute still fails</p> <p>I saw some about the turning the automatic required flag off for value types in Glocal.asx</p> <pre><code> DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false; </code></pre> <p>but this has not worked..is it a case to create a custom MetadataValidatorProvider for the app or is there something else going on </p> <p>Thanks in Adavance</p>
 

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