private static void SetFromDataTypeAndDisplayAttributes(DataAnnotationsModelMetadata result,
DataTypeAttribute dataTypeAttribute, DisplayFormatAttribute displayFormatAttribute)
{
if (dataTypeAttribute != null)
{
result.DataTypeName = dataTypeAttribute.ToDataTypeName();
}
if (displayFormatAttribute == null && dataTypeAttribute != null)
{
displayFormatAttribute = dataTypeAttribute.DisplayFormat;
// If DisplayFormat value was non-null and this [DataType] is of a subclass, assume the [DataType]
// constructor used the protected DisplayFormat setter to override its default. Note deriving from
// [DataType] but preserving DataFormatString and ApplyFormatInEditMode results in
// HasNonDefaultEditFormat==true.
if (displayFormatAttribute != null && dataTypeAttribute.GetType() != typeof(DataTypeAttribute))
{
result.HasNonDefaultEditFormat = true;
}
}
else if (displayFormatAttribute != null)
{
result.HasNonDefaultEditFormat = true;
}
if (displayFormatAttribute != null)
{
result.NullDisplayText = displayFormatAttribute.NullDisplayText;
result.DisplayFormatString = displayFormatAttribute.DataFormatString;
result.ConvertEmptyStringToNull = displayFormatAttribute.ConvertEmptyStringToNull;
result.HtmlEncode = displayFormatAttribute.HtmlEncode;
if (displayFormatAttribute.ApplyFormatInEditMode)
{
result.EditFormatString = displayFormatAttribute.DataFormatString;
}
if (!displayFormatAttribute.HtmlEncode && String.IsNullOrWhiteSpace(result.DataTypeName))
{
result.DataTypeName = DataTypeUtil.HtmlTypeName;
}
// Regardless of HasNonDefaultEditFormat calculation above, treat missing EditFormatString as the
// default. Note the corner case of a [DataType] subclass overriding a non-empty default to apply a
// [DisplayFormat] lacking DataFormatString or with ApplyFormatInEditMode==false results in
// HasNonDefaultEditFormat==false.
if (String.IsNullOrEmpty(result.EditFormatString))
{
result.HasNonDefaultEditFormat = false;
}
}
}
protected override ModelMetadata CreateMetadata(IEnumerable <Attribute> attributes, Type containerType, Func <object> modelAccessor, Type modelType, string propertyName)
{
List <Attribute> attributeList = new List <Attribute>(attributes);
DisplayColumnAttribute displayColumnAttribute = attributeList.OfType <DisplayColumnAttribute>().FirstOrDefault();
DataAnnotationsModelMetadata result = new DataAnnotationsModelMetadata(this, containerType, modelAccessor, modelType, propertyName, displayColumnAttribute);
// Do [HiddenInput] before [UIHint], so you can override the template hint
HiddenInputAttribute hiddenInputAttribute = attributeList.OfType <HiddenInputAttribute>().FirstOrDefault();
if (hiddenInputAttribute != null)
{
result.TemplateHint = "HiddenInput";
result.HideSurroundingHtml = !hiddenInputAttribute.DisplayValue;
}
// We prefer [UIHint("...", PresentationLayer = "MVC")] but will fall back to [UIHint("...")]
IEnumerable <UIHintAttribute> uiHintAttributes = attributeList.OfType <UIHintAttribute>();
UIHintAttribute uiHintAttribute = uiHintAttributes.FirstOrDefault(a => String.Equals(a.PresentationLayer, "MVC", StringComparison.OrdinalIgnoreCase))
?? uiHintAttributes.FirstOrDefault(a => String.IsNullOrEmpty(a.PresentationLayer));
if (uiHintAttribute != null)
{
result.TemplateHint = uiHintAttribute.UIHint;
}
DataTypeAttribute dataTypeAttribute = attributeList.OfType <DataTypeAttribute>().FirstOrDefault();
if (dataTypeAttribute != null)
{
result.DataTypeName = dataTypeAttribute.ToDataTypeName();
}
EditableAttribute editable = attributes.OfType <EditableAttribute>().FirstOrDefault();
if (editable != null)
{
result.IsReadOnly = !editable.AllowEdit;
}
else
{
ReadOnlyAttribute readOnlyAttribute = attributeList.OfType <ReadOnlyAttribute>().FirstOrDefault();
if (readOnlyAttribute != null)
{
result.IsReadOnly = readOnlyAttribute.IsReadOnly;
}
}
DisplayFormatAttribute displayFormatAttribute = attributeList.OfType <DisplayFormatAttribute>().FirstOrDefault();
if (displayFormatAttribute == null && dataTypeAttribute != null)
{
displayFormatAttribute = dataTypeAttribute.DisplayFormat;
}
if (displayFormatAttribute != null)
{
result.NullDisplayText = displayFormatAttribute.NullDisplayText;
result.DisplayFormatString = displayFormatAttribute.DataFormatString;
result.ConvertEmptyStringToNull = displayFormatAttribute.ConvertEmptyStringToNull;
if (displayFormatAttribute.ApplyFormatInEditMode)
{
result.EditFormatString = displayFormatAttribute.DataFormatString;
}
if (!displayFormatAttribute.HtmlEncode && String.IsNullOrWhiteSpace(result.DataTypeName))
{
result.DataTypeName = DataTypeUtil.HtmlTypeName;
}
}
ScaffoldColumnAttribute scaffoldColumnAttribute = attributeList.OfType <ScaffoldColumnAttribute>().FirstOrDefault();
if (scaffoldColumnAttribute != null)
{
result.ShowForDisplay = result.ShowForEdit = scaffoldColumnAttribute.Scaffold;
}
DisplayAttribute display = attributes.OfType <DisplayAttribute>().FirstOrDefault();
string name = null;
if (display != null)
{
result.Description = display.GetDescription();
result.ShortDisplayName = display.GetShortName();
result.Watermark = display.GetPrompt();
result.Order = display.GetOrder() ?? ModelMetadata.DefaultOrder;
name = display.GetName();
}
if (name != null)
{
result.DisplayName = name;
}
else
{
DisplayNameAttribute displayNameAttribute = attributeList.OfType <DisplayNameAttribute>().FirstOrDefault();
if (displayNameAttribute != null)
{
result.DisplayName = displayNameAttribute.DisplayName;
}
}
RequiredAttribute requiredAttribute = attributeList.OfType <RequiredAttribute>().FirstOrDefault();
if (requiredAttribute != null)
{
result.IsRequired = true;
}
return(result);
}