How can I get the sitecore field from an object property, mapped by glassmapper?

Question

We are using Glass Mapper with Sitecore, with our models we can get the values of sitecore fields. But I want to easily get the sitecore fields(sitecore field type) by using the model without hardcoding any strings (when using GetProperty(), you need the property name string ) into the method.

So I wrote this thing to achieve this, however I am not happy with 2 types need to be passed in when using it since it looks awful when you have a long model identifier.

   public static string SitecoreFieldName<T, TU>(Expression<Func<TU>> expr)
    {
         var body = ((MemberExpression)expr.Body);
         var attribute = (typeof(T).GetProperty(body.Member.Name).GetCustomAttributes(typeof(SitecoreFieldAttribute), false)[0]) as SitecoreFieldAttribute;
         return attribute.FieldName;
    }

The most ideal way is be able to get it like this Model.SomeProperty.SitecoreField(). However I can't figure out how to do the refection from there. Because that can will be a extension for any type.

Thanks!

So what is your question? Looks pretty simple and generic to me.. — Ruud van Falier, Sep 03 '14 at 07:27
The question is to improve it more. In this case, you need to pass in 2 types to make it work, which doesn't look very good on aspx page when you use it in a data bind context. — zhanke, Sep 03 '14 at 10:08

score 5 · Accepted Answer · edited Dec 11 '15 at 14:22

5

public static string SitecoreFieldName<TModel>(Expression<Func<TModel, object>> field)
{
    var body = field.Body as MemberExpression;

    if (body == null)
    {
        return null;
    }

    var attribute = typeof(TModel).GetProperty(body.Member.Name)
        .GetCustomAttributes(typeof(SitecoreFieldAttribute), true)
        .FirstOrDefault() as SitecoreFieldAttribute;

    return attribute != null
        ? attribute.FieldName
        : null;
}

Note that I put inherit=true on the GetCustomAttributes method call.
Otherwise inherited attributes are ignored.

edited Dec 11 '15 at 14:22

Liam

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answered Sep 03 '14 at 10:22

Ruud van Falier

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Sorry I cant upvote yet but thanks! it's exactly what I was looking for. – zhanke Sep 03 '14 at 10:23

score 1 · Answer 2 · answered Sep 03 '14 at 10:14

I don't understand why my question got down-voted. So you think it's perfect code already?

With help of another senior developer, I improved it today so it doesn't need 2 types any more and much clearer on usage syntax:

public static Field GetSitecoreField<T>(T model, Expression<Func<T, object>> expression) where T : ModelBase
    {
        var body = ((MemberExpression)expression.Body);
        var attributes = typeof(T).GetProperty(body.Member.Name).GetCustomAttributes(typeof(SitecoreFieldAttribute), false);
        if (attributes.Any())
        {
            var attribute = attributes[0] as SitecoreFieldAttribute;
            if (attribute != null)
            {
                return model.Item.Fields[attribute.FieldName];
            }
        }
        return null;
    }

and I can just call it by doing this:

GetSitecoreField(Container.Model<SomeModel>(), x => x.anyField)

Hope it helps anyone who is using Glass Mapper with Sitecore and want to get current sitecore field from model property.

How can I get the sitecore field from an object property, mapped by glassmapper?

2 Answers2