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Showing content from https://docs.unity3d.com/Manual/../ScriptReference/PackageManager.PackageCollection.html below:

Unity - Scripting API: PackageCollection

PackageCollection

class in UnityEditor.PackageManager

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Switch to Manual Description

A collection class that represents all packages in a Unity project, providing enumeration and error handling capabilities for package management operations.

Implements IEnumerable <PackageInfo> interface.

The PackageCollection class serves as a container for PackageInfo objects representing all packages in a Unity project. PackageCollection information is typically obtained as the result of a Client.List() operation. Use the PackageCollection to iterate through packages and check for collection-level errors that might occur during package resolution.

using UnityEditor.PackageManager;
using UnityEditor.PackageManager.Requests;
using UnityEngine;public class PackageExample 
{
    void ListAllPackages()
    {
        ListRequest request = Client.List();
        
        while(!request.IsCompleted) {}
        if (request.Status == StatusCode.Success)
        {
            PackageCollection packages = request.Result;
            
            // Check for collection-level errors
            if (packages.error != null)
            {
                Debug.LogError($"Collection error: {packages.error}");
                return;
            }
            // Enumerate through packages
            foreach (PackageInfo package in packages)
            {
                Debug.Log($"Found package: {package.name} @ {package.version}");
            }
        }
    }
}

Remarks

After the PackageCollection is created, it's immutable.
Package enumeration order isn't guaranteed.
Collection-level errors indicate issues with the overall package resolution, not with individual packages.
The collection can contain direct dependencies and transitive dependencies.
Use in conjunction with Client.List() to get an up-to-date view of project packages.

Related information

Properties Property Description error The error associated with the package collection.

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