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;
}
}
}
