// This manually parses the XML that comes back.
// This function uses code from this blog entry:
// http://blogs.msdn.com/b/avkashchauhan/archive/2011/03/28/reading-and-saving-table-storage-entities-without-knowing-the-schema-or-updating-tablestorageentity-schema-at-runtime.aspx
public static void OnReadingEntity(object sender, Client.ReadingWritingEntityEventArgs args)
{
GenericEntity entity = args.Entity as GenericEntity;
if (entity == null)
{
return;
}
// read each property, type and value in the payload
var properties = args.Entity.GetType().GetProperties();
var q = from p in args.Data.Element(AtomNamespace + "content")
.Element(MetadataNamespace + "properties")
.Elements()
where properties.All(pp => pp.Name != p.Name.LocalName)
select new
{
Name = p.Name.LocalName,
IsNull = string.Equals("true", p.Attribute(MetadataNamespace + "null") == null ? null : p.Attribute(MetadataNamespace + "null").Value, StringComparison.OrdinalIgnoreCase),
TypeName = p.Attribute(MetadataNamespace + "type") == null ? null : p.Attribute(MetadataNamespace + "type").Value,
p.Value
};
foreach (var dp in q)
{
string value = dp.Value;
if (!string.IsNullOrWhiteSpace(value))
{
value = string.Empty;
}
entity.properties[dp.Name] = dp.Value;
}
}
private void InitColumnNames()
{
if (_columnNames == null)
{
TableServiceContext ctx = _tableClient.GetDataServiceContext();
ctx.IgnoreMissingProperties = true;
ctx.ReadingEntity += GenericTableReader.OnReadingEntity;
var x = from o in ctx.CreateQuery <GenericEntity>(_tableName) select o;
GenericEntity all = x.First();
List <string> props = new List <string>();
props.Add("PartitionKey");
props.Add("RowKey");
props.AddRange(all.properties.Keys);
_columnNames = props.ToArray();
}
}
