public static bool MappingIsList(XmlMapping mapping)
{
var type = mapping.PropertyCache.Property.PropertyType;
return(type.IsGenericType && type.GetGenericTypeDefinition() == typeof(List <>));
}
public LadderCondition(XmlMapping mapping, int mappingIndex, XmlSerializerGenerator generator)
{
this.mapping = mapping;
this.mappingIndex = mappingIndex;
this.generator = generator;
}
/// <summary>
/// Generate an expression like
///
/// if (obj.Items == null)
/// obj.Items = new List();
/// </summary>
/// <param name="target">The object containing an item property.</param>
/// <param name="mapping">The mapping for the list property.</param>
/// <returns>An expression for initializing an list of items.</returns>
public static Tuple <MemberExpression, ConditionalExpression> InitializeListIfNull(Expression target, XmlMapping mapping)
{
var memberAccess = Expression.MakeMemberAccess(target, mapping.PropertyCache.Property); //obj.Items
var @null = Expression.Constant(null, mapping.PropertyCache.Property.PropertyType);
var isNull = Expression.Equal(memberAccess, @null); //obj.Items == null
var newList = Expression.New(mapping.PropertyCache.Property.PropertyType); //new List()
var assignNew = Expression.Assign(memberAccess, newList);
var ifNullThenNew = Expression.IfThen(isNull, assignNew); //if(obj.Items == null) obj.Items = new List()
return(Tuple.Create(memberAccess, ifNullThenNew));
}