Getting the JsonPropertyAttribute of a Property

Question

I found a post with a great answer for a problem I have, but I can\'t seem to find a small detail I\'m looking for.

public class myModel
{
   [JsonProperty(P         


        

Answer 1

Here's a way of doing it while keeping things strongly typed:

public static string GetPropertyAttribute<TType>(Expression<Func<TType, object>> property)
{
    var memberExpression = property.Body as MemberExpression;
    if(memberExpression == null)
        throw new ArgumentException("Expression must be a property");

    return memberExpression.Member
        .GetCustomAttribute<JsonPropertyAttribute>()
        .PropertyName;
}

And call it like this:

var result = GetPropertyAttribute<myModel>(t => t.SomeString);

You can make this a bit more generic, for example:

public static TAttribute GetPropertyAttribute<TType, TAttribute>(Expression<Func<TType, object>> property)
where TAttribute : Attribute
{
    var memberExpression = property.Body as MemberExpression;
    if(memberExpression == null)
        throw new ArgumentException("Expression must be a property");

    return memberExpression.Member
        .GetCustomAttribute<TAttribute>();
}

And now because the attribute is generic, you need to move the PropertyName call outside:

var attribute = GetPropertyAttribute<myModel, JsonPropertyAttribute>(t => t.SomeString);
var result = attribute.PropertyName;