Question

I’ve created an expression that I’m using for sorting which works fine, until I hit a DateTime field, where I get the following error (on the second line):

Expression of type ‘System.DateTime’ cannot be used for return type
‘System.Object’

Here’s my code:

ParameterExpression param = Expression.Parameter(typeof(MyEntity), "x");

Expression<Func<MyEntity, object>> sortExpression =
    Expression.Lambda<Func<AMyEntity, object>>(
        Expression.Property(param, sortKey), param);

Can anyone help at all?

Answer 1

Just add a conversion in there:

Expression<Func<MyEntity, object>> sortExpression =
    Expression.Lambda<Func<AMyEntity, object>>(
        Expression.Convert(
            Expression.Property(param, sortKey),
            typeof(object)),
        param);