private static bool InferMapping <T>(this MemberInfo member, FallbackStrategy emptyValueStrategy, out ExcelPropertyMap mapping)
{
if (member.AutoMap(emptyValueStrategy, out SingleExcelPropertyMap <T> singleMapping))
{
mapping = singleMapping;
return(true);
}
if (member.MemberType().GetElementTypeOrEnumerableType(out Type elementType))
{
MethodInfo method = AutoMapEnumerableMethod.MakeGenericMethod(elementType);
var parameters = new object[] { member, emptyValueStrategy, null };
bool result = (bool)method.Invoke(null, parameters);
if (result)
{
mapping = (ExcelPropertyMap)parameters[2];
return(true);
}
}
if (member.AutoMapObject(emptyValueStrategy, out ObjectExcelPropertyMap <T> objectMapping))
{
mapping = objectMapping;
return(true);
}
mapping = null;
return(false);
}
/// <summary>
/// Creates a map for a property or field given a MemberExpression reading the property or field.
/// This is used for mapping objects that contain nested objects, primitives or enumerables.
/// </summary>
/// <typeparam name="TProperty">The element type of property or field to map.</typeparam>
/// <param name="expression">A MemberExpression reading the property or field.</param>
/// <returns>The map for the given property or field.</returns>
public ObjectExcelPropertyMap <TProperty> MapObject <TProperty>(Expression <Func <T, TProperty> > expression)
{
MemberExpression memberExpression = GetMemberExpression(expression);
MemberInfo member = memberExpression.Member;
if (!member.AutoMapObject(EmptyValueStrategy, out ObjectExcelPropertyMap <TProperty> mapping))
{
throw new ExcelMappingException($"Could not map object of type \"{typeof(TProperty)}\".");
}
AddMapping(mapping, expression);
return(mapping);
}