Get PropertyType.Name in reflection from Nullable type

Question

I want use reflection for get properties type. this is my code

var properties = type.GetProperties();
foreach (var propertyInfo in properties)
{
     model.         


        

Answer 1

This is an old question, but I ran into this as well. I like @Igoy's answer, but it doesn't work if the type is an array of a nullable type. This is my extension method to handle any combination of nullable/generic and array. Hopefully it will be useful to someone with the same question.

public static string GetDisplayName(this Type t)
{
    if(t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable<>))
        return string.Format("{0}?", GetDisplayName(t.GetGenericArguments()[0]));
    if(t.IsGenericType)
        return string.Format("{0}<{1}>",
                             t.Name.Remove(t.Name.IndexOf('`')), 
                             string.Join(",",t.GetGenericArguments().Select(at => at.GetDisplayName())));
    if(t.IsArray)
        return string.Format("{0}[{1}]", 
                             GetDisplayName(t.GetElementType()),
                             new string(',', t.GetArrayRank()-1));
    return t.Name;
}

This will handle cases as complicated as this:

typeof(Dictionary<int[,,],bool?[][]>).GetDisplayName()

Returns:

Dictionary<Int32[,,],Boolean?[][]>

Answer 2

Change your code to look for nullable type, in that case take PropertyType as the first generic argument:

var propertyType = propertyInfo.PropertyType;

if (propertyType.IsGenericType &&
        propertyType.GetGenericTypeDefinition() == typeof(Nullable<>))
    {
      propertyType = propertyType.GetGenericArguments()[0];
    }

model.ModelProperties.Add(new KeyValuePair<Type, string>
                        (propertyType.Name,propertyInfo.Name));