Table of Contents

Class StreamMerge


The base class for all DataSources, especially custom DataSources. It must always be inherited. It provides a lot of core functionality to get configurations, ensure caching and more.

Important: in most cases you will inherit the CustomDataSource DataSource for custom data sources.

The StreamMerge DataSource is part of the Standard EAV Data Sources. It will create a new stream containing everything which came into this data source.

How to use with the VisualQuery

When using the VisualQuery you can just drag it into your query. This is what it usually looks like:

The above example shows two filters finding items and delivering them on the same stream.

Example Using ItemFilterDuplicates

A common scenario will also combine this using the ItemFilterDuplicates, in case various in-streams deliver the same item:

No Settings

The StreamMerge DataSource has no settings to configure.

Note that it will automatically merge the streams in A-Z order of the In-Stream names.

Programming With The StreamMerge DataSource

We recommend to use the VisualQuery where possible, as it's easier to understand and is identical for C# and JavaScript. It's also better because it separates data-retrieval from visualization.

Read also

You should find some examples in this demo App


  1. Introduced in EAV 4.x, 2sxc 9.10

API Documentation

[VisualQuery(NiceName = "Merge Streams", UiHint = "Combine multiple streams into one", Icon = "merge_type", Type = DataSourceType.Logic, NameId = "ToSic.Eav.DataSources.StreamMerge, ToSic.Eav.DataSources", DynamicOut = false, DynamicIn = true, HelpLink = "")]
public sealed class StreamMerge : DataSourceBase, IDataSource, IAppIdentity, IZoneIdentity, IAppIdentityLight, ICacheKey, ICacheExpiring, ITimestamped, IHasLog, IDataSourceLinkable
Inherited Members


Had a major, breaking update in v15. Consult the guide to upgrade your custom data sources.