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Decision conditions ​

The Decision router sends each record down one branch of the flow. You write a short C# method that returns a route name; the record goes to the connections whose Route Id is that name.

Write the condition ​

csharp
public string GetRoute(IMetaData metaDataInstance, IViaType inputDataInstance)
{
    var metaData = (viauser.FlowMetaData)metaDataInstance;
    var inputData = (viauser.Order)inputDataInstance;
    if (inputData.Amount > 1000) return "Large";
    return "Small";
}

The template casts the input to the type of the input connection. The Services property gives you the flow services, and the flow's NuGet packages are available.

Draw the branches ​

  1. Draw one connection from the router's Output for each branch.
  2. Select a connection and set its Route Id in the connection properties: Large, Small.
  3. Switch on Show route to see the route id on the canvas.

How records are routed ​

  • The returned name is compared with each route id exactly, including case.
  • A record whose name matches no connection is dropped.
  • A connection without a route id receives every record.

For an "else" branch, return an explicit name such as "Other" and give a connection that route id.

The condition runs for every record. Keep it fast and free of side effects.

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