public object[] GetSkipToken(IDataServiceQueryProvider dataServiceQueryPovider)
{
if (this.lastObject != null)
{
if (this.lastObject.GetType() == typeof(int))
{
return(new object[] { -1 });
}
object resource = this.lastObject;
IExpandedResult expandedResult = resource as IExpandedResult;
if (expandedResult != null)
{
resource = expandedResult.ExpandedElement;
}
IEnumerable <string> keyPropertyNames = this.IsReflectableResourceType ?
new string[] { "ID" } :
this.resourceType.KeyProperties.Select(property => property.Name);
ProjectedWrapper projectedWrapper = resource as ProjectedWrapper;
if (projectedWrapper != null)
{
return(keyPropertyNames.Select(propertyName =>
projectedWrapper.GetProjectedPropertyValue(propertyName)).ToArray());
}
else if (dataServiceQueryPovider != null)
{
return(keyPropertyNames.Select(propertyName =>
dataServiceQueryPovider.GetPropertyValue(resource, this.resourceType.Properties.Single(p => p.Name == propertyName))).ToArray());
}
else
{
return(keyPropertyNames.Select(propertyName =>
resource.GetType().GetProperty(propertyName).GetValue(resource, null)).ToArray());
}
}
return(new Random().Next() % 2 == 0 ? null : new object[0]);
}
/// <summary>Adds a property to the null valued collection</summary>
/// <param name="epmInfo">EpmInfo containing the property information such as path</param>
internal void Add(EntityPropertyMappingInfo epmInfo)
{
Debug.Assert(epmInfo != null, "epmInfo != null");
EpmNullValuedPropertyNode current = this.root;
ResourceType currentType = epmInfo.DefiningType;
object currentValue = this.element;
// We are here because the epm path points to a null value. If the path is multiple level deep, we need to
// know the first level the null value begins and we don't need to serialize deeper than that.
// To serialize the complex properties correctly in the case they are not already in content, we also need
// to find the type for each segment from root to the first segment that has the null property value.
foreach (var segment in epmInfo.Attribute.SourcePath.Split('/'))
{
EpmNullValuedPropertyNode child = current.Children.FirstOrDefault(c => c.Name == segment);
if (child != null)
{
// The current segment is already added to the tree, reuse it.
current = child;
currentValue = child.Element;
currentType = child.ResourceType;
}
else
{
EpmNullValuedPropertyNode newNode = new EpmNullValuedPropertyNode {
Name = segment
};
Debug.Assert(currentType != null, "currentType != null");
ResourceProperty property = currentType.TryResolvePropertyName(segment);
Debug.Assert(currentValue != null, "currentValue != null");
ProjectedWrapper projectedValue = currentValue as ProjectedWrapper;
if (projectedValue == null)
{
if (property != null)
{
currentValue = this.provider.GetPropertyValue(currentValue, property, currentType);
currentValue = currentValue == DBNull.Value ? null : currentValue;
currentType = property.ResourceType;
}
else
{
// Handle open property...
currentValue = this.provider.GetOpenPropertyValue(currentValue, segment);
currentValue = currentValue == DBNull.Value ? null : currentValue;
if (currentValue != null)
{
// Get the type from the instance.
currentType = this.provider.GetResourceType(currentValue);
}
else
{
// We have a null open property at hand, we don't know its type.
// Default the type to string so that we will omit the type name
// and just write out null. i.e. <d:prop m:null='true'/>
currentType = ResourceType.PrimitiveStringResourceType;
}
}
}
else
{
currentValue = projectedValue.GetProjectedPropertyValue(segment);
currentValue = currentValue == DBNull.Value ? null : currentValue;
if (property != null)
{
currentType = property.ResourceType;
}
else
{
// Handle open property...
if (currentValue == null)
{
// We have a null open property at hand, we don't know its type.
// Default the type to string so that we will omit the type name
// and just write out null. i.e. <d:prop m:null='true'/>
currentType = ResourceType.PrimitiveStringResourceType;
}
else
{
projectedValue = currentValue as ProjectedWrapper;
if (projectedValue != null)
{
// Get the type from the project wrapper.
currentType = this.provider.TryResolveResourceType(projectedValue.ResourceTypeName);
}
else
{
// Get the type from the instance.
currentType = this.provider.GetResourceType(currentValue);
}
}
}
}
Debug.Assert(currentType != null, "currentType != null");
Debug.Assert(currentValue != DBNull.Value, "currentValue != DBNull.Value -- we have converted DBNull to null");
newNode.ResourceType = currentType;
newNode.Element = currentValue;
current.Children.Add(newNode);
current = newNode;
}
if (current.Element == null)
{
// If the current element is null, we don't need to go further since that is the obvious reason
// that the children properties are null.
break;
}
}
}
