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Unity - Scripting API: GameObject.GetComponents

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T[] An array containing all matching components of type T.

Retrieves references to all components of type T on the specified GameObject.

The typical usage for this method is to call it on a reference to a different GameObject than the one your script is on. For example:

myResults = otherGameObject.GetComponents<ComponentType>()

However, if you're writing code inside a MonoBehaviour class, you can omit the preceding GameObject reference to perform the search on the same GameObject your script is attached to. In this instance, you're actually calling Component.GetComponents because the script itself is a type of component, but the result is the same as if you'd referenced the GameObject itself. For example:

myResults = GetComponents<ComponentType>()

To find components attached to a particular GameObject, you need a reference to that other GameObject (or any component attached to that GameObject). You can then call GetComponents on that reference.

Note: If the type you request is a derivative of MonoBehaviour and the associated script can't be loaded then this function will return null for that component.

The following example gets a reference to all hinge joint components on the specified GameObject, and sets a property on each hinge joint component that was found.

using UnityEngine;
public class GetComponentsExample : MonoBehaviour
{
    // Disable the spring on all HingeJoints in the referenced GameObject
    public GameObject objectToCheck;
    void Start()
    {
        HingeJoint[] hingeJoints;
        hingeJoints = objectToCheck.GetComponents<HingeJoint>();
        foreach (HingeJoint joint in hingeJoints)
        {
            joint.useSpring = false;
        }
    }
}

Additional resources: Component, GameObject.GetComponentsInChildren

A variation of the GetComponents method which allows you to supply your own List to be filled with results.

This allows you to avoid allocating new List objects for each call to the method. The list you supply is resized to match the number of results found, and any existing values in the list are overritten.

using UnityEngine;
using System.Collections.Generic;
public class GetComponentsExample : MonoBehaviour
{
    // Disable the spring on all HingeJoints in the referenced GameObject
    public GameObject objectToCheck;
    void Start()
    {
        List<HingeJoint> hingeJoints = new List<HingeJoint>();
        objectToCheck.GetComponents(hingeJoints);
        foreach (HingeJoint joint in hingeJoints)
        {
            joint.useSpring = false;
        }
    }
}

Additional resources: Component, GameObject.GetComponentsInChildren

Component[] An array containing all matching components of type type.

The non-generic version of this method.

This version of GetComponents is not as efficient as the Generic version (above), so you should only use it if necessary.

using UnityEngine;
public class GetComponentsExample : MonoBehaviour
{
    // Disable the spring on all HingeJoints in the referenced GameObject
    public GameObject objectToCheck;
    void Start()
    {
        Component[] hingeJoints;
        hingeJoints = objectToCheck.GetComponents(typeof(HingeJoint));
        foreach (HingeJoint joint in hingeJoints)
        {
            joint.useSpring = false;
        }
    }
}

Additional resources: Component, GameObject.GetComponentsInChildren

The non-generic version of this method which allows you to supply your own List to be filled with results.

With this version of the GetComponents method, results is of type Component, not the type of the component retrieved.

If the type you request is a derivative of MonoBehaviour and the associated script can not be loaded then this function will return null for that component.

using UnityEngine;
using System.Collections.Generic;
public class GetComponentsExample : MonoBehaviour
{
   // Disable the spring on all HingeJoints in the referenced GameObject
    public GameObject objectToCheck;

    void Start()
    {
        List<Component> hingeJoints = new List<Component>();
        objectToCheck.GetComponents(typeof(HingeJoint), hingeJoints);
        foreach (HingeJoint joint in hingeJoints)
        {
            joint.useSpring = false;
        }
    }
}

Additional resources: Component, GameObject.GetComponentsInChildren

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