Serialize AdomdDataProvider
The implementation demonstrated in this article can also be reviewed in the Serialize AdomdDataProvider SDK Example of the SDK Examples Browser
In this article we will show you how to serialize and deserialize AdomdDataProvider and all of its settings. You can use this feature to save the current state of the provider and load it next time the application is started.
Serialize AdomdDataProvider with DataContractSerializer
We've added the DataContract attribute to all classes used by AdomdDataProvider. So you can easily serialize it by using DataContractSerializer. Below you will find out how to create a serializer and use it with RadPivotGrid.
So lets create a simple class that we'll use to save (when serializing) and load (when deserializing) DataProviderSettings. You have to add the DataContract attribute to the new class and DataMember attribute for its properties.
[DataContract]
public class DataProviderSettings
{
[DataMember]
public object[] Aggregates { get; set; }
[DataMember]
public object[] Filters { get; set; }
[DataMember]
public object[] Rows { get; set; }
[DataMember]
public object[] Columns { get; set; }
[DataMember]
public int AggregatesLevel { get; set; }
[DataMember]
public PivotAxis AggregatesPosition { get; set; }
}The next step is to implement the serializer. When serializing the provider, you have to create an instance of DataProviderSettings class and set all of the properties. After that you can serialize the instance to a file or a stream. When using DataContractSerializer you have to give a collection of KnownTypes to the serializer. That's why we've created a new AdomdPivotSerializationHelper class which has a static member - KnownTypes. It consits of all types you'll need in order to serialize AdomdDataProvider. Here's an example how to implement your own serializer:
public abstract class DataProviderSerializer
{
public abstract IEnumerable<Type> KnownTypes { get; }
public string Serialize(object context)
{
string serialized = string.Empty;
IDataProvider dataProvider = context as IDataProvider;
if (dataProvider != null)
{
MemoryStream stream = new MemoryStream();
DataProviderSettings settings = new DataProviderSettings()
{
Aggregates = dataProvider.Settings.AggregateDescriptions.OfType<object>().ToArray(),
Filters = dataProvider.Settings.FilterDescriptions.OfType<object>().ToArray(),
Rows = dataProvider.Settings.RowGroupDescriptions.OfType<object>().ToArray(),
Columns = dataProvider.Settings.ColumnGroupDescriptions.OfType<object>().ToArray(),
AggregatesLevel = dataProvider.Settings.AggregatesLevel,
AggregatesPosition = dataProvider.Settings.AggregatesPosition
};
DataContractSerializer serializer = new DataContractSerializer(typeof(DataProviderSettings), KnownTypes);
serializer.WriteObject(stream, settings);
stream.Position = 0;
var streamReader = new StreamReader(stream);
serialized += streamReader.ReadToEnd();
}
return serialized;
}
public void Deserialize(object context, string savedValue)
{
IDataProvider dataProvider = context as IDataProvider;
if (dataProvider != null)
{
var stream = new MemoryStream();
var tw = new StreamWriter(stream);
tw.Write(savedValue);
tw.Flush();
stream.Position = 0;
DataContractSerializer serializer = new DataContractSerializer(typeof(DataProviderSettings), KnownTypes);
var result = serializer.ReadObject(stream);
dataProvider.Settings.AggregateDescriptions.Clear();
foreach (var aggregateDescription in (result as DataProviderSettings).Aggregates)
{
dataProvider.Settings.AggregateDescriptions.Add(aggregateDescription);
}
dataProvider.Settings.FilterDescriptions.Clear();
foreach (var filterDescription in (result as DataProviderSettings).Filters)
{
dataProvider.Settings.FilterDescriptions.Add(filterDescription);
}
dataProvider.Settings.RowGroupDescriptions.Clear();
foreach (var rowDescription in (result as DataProviderSettings).Rows)
{
dataProvider.Settings.RowGroupDescriptions.Add(rowDescription);
}
dataProvider.Settings.ColumnGroupDescriptions.Clear();
foreach (var columnDescription in (result as DataProviderSettings).Columns)
{
dataProvider.Settings.ColumnGroupDescriptions.Add(columnDescription);
}
dataProvider.Settings.AggregatesPosition = (result as DataProviderSettings).AggregatesPosition;
dataProvider.Settings.AggregatesLevel = (result as DataProviderSettings).AggregatesLevel;
}
}
}
public class AdomdProviderSerializer : DataProviderSerializer
{
public override IEnumerable<Type> KnownTypes
{
get
{
return AdomdPivotSerializationHelper.KnownTypes;
}
}
}So the last step is to serialize the provider and deserialize it:
string lastSerializadProvider;
//serializiation
AdomdProviderSerializer provider = new AdomdProviderSerializer();
this.lastSerializedProvider = provider.Serialize(this.pivot.DataProvider);
//deserialization
AdomdProviderSerializer provider = new AdomdProviderSerializer();
provider.Deserialize(this.pivot.DataProvider, this.lastSerializedProvider);