69 lines
2.5 KiB
Markdown
69 lines
2.5 KiB
Markdown
# Add logic to a Custom C# node
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> [!NOTE]
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> To add logic to a node, you must create a Custom C# node and add ports. [!include[vs-tasks-note-end](./snippets/custom-c-nodes/vs-tasks-note-end.md)]
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After you create a Custom C# node and [add ports](vs-create-custom-node-add-ports.md), you can add logic to a node. Add logic to tell Visual Scripting what the node does with any data it receives from its ports.
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To add logic to a node:
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1. [!include[open-project-window](./snippets/vs-open-project-window.md)]
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2. [!include[open-existing-external-code](./snippets/vs-open-existing-external-code.md)]
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3. In your external editor, add any logic for the node within the lambda expression that handles the assignment of the `inputTrigger`. For example, you can take the values of the [two `string` input ports added in the previous example](vs-create-custom-node-add-ports.md#add-value-ports) and concatenate them, as shown in the following code:
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```C#
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using System;
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using Unity.VisualScripting;
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using UnityEngine;
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public class MyNode : Unit
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{
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[DoNotSerialize]
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public ControlInput inputTrigger;
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[DoNotSerialize]
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public ControlOutput outputTrigger;
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[DoNotSerialize]
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public ValueInput myValueA;
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[DoNotSerialize]
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public ValueInput myValueB;
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[DoNotSerialize]
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public ValueOutput result;
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private string resultValue;
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protected override void Definition()
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{
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//The lambda to execute our node action when the inputTrigger port is triggered.
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inputTrigger = ControlInput("inputTrigger", (flow) =>
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{
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//Making the resultValue equal to the input value from myValueA concatenating it with myValueB.
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resultValue = flow.GetValue<string>(myValueA) + flow.GetValue<string>(myValueB) + "!!!";
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return outputTrigger;
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});
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outputTrigger = ControlOutput("outputTrigger");
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myValueA = ValueInput<string>("myValueA", "Hello ");
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myValueB = ValueInput<string>("myValueB", String.Empty);
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result = ValueOutput<string>("result", (flow) => resultValue);
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}
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}
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```
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4. [!include[save-script](./snippets/vs-save-script.md)]
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1. [!include[return-unity](./snippets/vs-return-unity.md)]
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5. Do one of the following:
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- [!include[open-graph-w-node](./snippets/custom-c-nodes/vs-open-graph-w-node.md)].
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- [!include[ff-add-node](./snippets/custom-c-nodes/vs-ff-add-node.md)]
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## Next steps
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After you add logic to a node, [add relations](vs-create-custom-node-add-relations.md) to ensure that the node displays correctly in Visual Scripting.
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