Creating custom attribute Entity Framework 5 for DateTime to be saved as UTC

Question

I'm trying to use the code given in this article

[AttributeUsage(AttributeTargets.Property)]
public class DateTimeKindAttribute : Attribute
{
private readonly DateTimeKind _kind;

public DateTimeKindAttribute(DateTimeKind kind)
{
    _kind = kind;
}

public DateTimeKind Kind
{
    get { return _kind; }
}

public static void Apply(object entity)
{
    if (entity == null)
        return;

    var properties = entity.GetType().GetProperties()
        .Where(x => x.PropertyType == typeof(DateTime) || x.PropertyType == typeof(DateTime?));

    foreach (var property in properties)
    {
        var attr = property.GetCustomAttribute<DateTimeKindAttribute>();
        if (attr == null)
            continue;

        var dt = property.PropertyType == typeof(DateTime?)
            ? (DateTime?) property.GetValue(entity)
            : (DateTime) property.GetValue(entity);

        if (dt == null)
            continue;

        property.SetValue(entity, DateTime.SpecifyKind(dt.Value, attr.Kind));
    }
}

}

But I'm getting an error at

var attr = property.GetCustomAttribute<DateTimeKindAttribute>();

Error : The non-generic method 'System.Reflection.MemberInfo.GetCustomAttributes(bool)' cannot be used with type arguments

Any solutions???

score 3 · Answer 1 · answered Jun 13 '20 at 16:20

3

Just had the same problem, my solution was simply to add

using System.Reflection;

answered Jun 13 '20 at 16:20

zevele

46
1
3

score 2 · Answer 2 · answered Dec 05 '13 at 09:27

With the code you posted, I would expect this:

'System.Reflection.PropertyInfo' does not contain a definition for 'GetCustomAttribute' and no extension method 'GetCustomAttribute' accepting a first argument of type 'System.Reflection.PropertyInfo' could be found

If you changed the code to this (i.e. make the call plural)

var attr = property.GetCustomAttributes<DateTimeKindAttribute>();

then you get the error you posted:

The non-generic method 'System.Reflection.MemberInfo.GetCustomAttributes(bool)' cannot be used with type arguments

The generic method used in the original answer is an extension in the CustomAttributeExtensions namespace, and you need .NET 4.5

Creating custom attribute Entity Framework 5 for DateTime to be saved as UTC

2 Answers2