/// <summary>
/// Use the ODataReader to read results and convert them feed into usable CLR instances.
/// </summary>
/// <param name="odataReader">OData Reader representing current OData feed download.</param>
private void MaterializeResponse(ODataMessageReader odataReader)
{
var feedReader = this.CreateReader(odataReader);
List<ODataEntity> odataEntities = new List<ODataEntity>();
Exception readingError = null;
Uri nextPageLink = null;
long? totalCount = null;
try
{
ODataEntity currentEntity = new ODataEntity();
while (feedReader.Read())
{
// we never expand in this application, so there is no chance of getting back an expanded link
switch (feedReader.State)
{
case ODataReaderState.EntryStart:
currentEntity = new ODataEntity();
odataEntities.Add(currentEntity);
break;
case ODataReaderState.NavigationLinkEnd:
ODataNavigationLink navigationLink = (ODataNavigationLink)feedReader.Item;
currentEntity.NavigationProperties[navigationLink.Name] = navigationLink.Url;
break;
case ODataReaderState.EntryEnd:
ODataEntry entry = (ODataEntry)feedReader.Item;
currentEntity.TypeName = entry.TypeName;
currentEntity.EditLink = entry.EditLink;
currentEntity.ReadLink = entry.ReadLink;
if (entry.MediaResource != null)
{
currentEntity.MediaUri = entry.MediaResource.ReadLink.OriginalString;
currentEntity.MediaType = entry.MediaResource.ContentType;
}
foreach (var property in entry.Properties)
{
this.MaterializeProperty(currentEntity, property, property.Name);
}
break;
case ODataReaderState.FeedEnd:
ODataFeed feed = (ODataFeed)feedReader.Item;
nextPageLink = feed.NextPageLink;
totalCount = feed.Count;
break;
}
}
}
catch (Exception deserializationError)
{
readingError = deserializationError;
}
this.RaiseFeedDownloaded(odataEntities, nextPageLink, totalCount, readingError);
}
/// <summary>
/// Read instance property value and add to Property dictionary on ODataEntity instance.
/// </summary>
/// <param name="currentEntity">ODataEntity instance being initialized</param>
/// <param name="property">The instance property value being read.</param>
/// <param name="propertyName">The name of the instance property being read.</param>
private void MaterializeProperty(ODataEntity currentEntity, ODataProperty property, string propertyName)
{
if (property.Value is ODataComplexValue)
{
// for a given complex value , we will flatten it out so that
// Excel can show these values in a tabular format instead of having to nest rows.
// e.g.: if the property value is BoxArt{ SmallUrl ="", LargeUrl =""}
// we will convert it into .
// instance[BoxArt.SmallUrl] = "";
// instance[BoxArt.LargeUrl] = "";
ODataComplexValue complexPropertyValue = (ODataComplexValue)property.Value;
foreach (var primitiveProperty in complexPropertyValue.Properties)
{
string flattenedPropertyName = string.Join(".", propertyName, primitiveProperty.Name);
this.MaterializeProperty(currentEntity, primitiveProperty, flattenedPropertyName);
}
}
else if (property.Value is ODataCollectionValue)
{
// we don't support collections here yet.
}
else
{
// this is a primitive property, assign results to dictionary.
currentEntity[propertyName] = property.Value;
}
}
