hastexture 这个api好像有问题 getTexture替代
HasProperty这个比较好

新版URP貌似已经有了

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;

public class ConvertURPLit : EditorWindow
{
    private static ConvertURPLit _myWindow;

    public Shader shader;


    [MenuItem("Tools/ConvertURPLit", false, priority = 20)]
    static void Init()
    {
        _myWindow = (ConvertURPLit) EditorWindow.GetWindow(typeof(ConvertURPLit), false, "替换shader", true); //创建窗口
        _myWindow.Show(); //展示
    }

    void OnGUI()
    {
        shader = EditorGUILayout.ObjectField("替换的shader", shader, typeof(Shader), false) as Shader;
        
        if (GUILayout.Button("转换"))
        {
            var objs = Selection.objects;
            if (objs.Length > 0 && shader)
            {
                foreach (var obj in objs)
                {
                    var renderers = obj.GetComponentsInChildren<Renderer>();
                    foreach (var renderer in renderers)
                    {
                        var mats = renderer.sharedMaterials;

                        for (int i = 0; i <  mats.Length; i++)
                        {
                            Undo.RecordObject(renderer.sharedMaterials[i], "shader ssss");
                            renderer.sharedMaterials[i].shader = shader;
                            
                            if (mats[i].HasColor("_Color"))
                            {
                                renderer.sharedMaterials[i].SetColor("_BaseColor",mats[i].GetColor("_Color"));
                            }
                            
                            if (mats[i].GetTexture("_Albedo"))
                            {
                                renderer.sharedMaterials[i].mainTexture = mats[i].GetTexture("_Albedo");
                                renderer.sharedMaterials[i].SetTexture("_BaseMap", mats[i].GetTexture("_Albedo"));
                                
                            }
                            
                            if (mats[i].GetTexture("_MainTex"))
                            {
                                renderer.sharedMaterials[i].mainTexture = mats[i].GetTexture("_MainTex");
                                renderer.sharedMaterials[i].SetTexture("_BaseMap", mats[i].GetTexture("_MainTex"));
                            }

                            if (mats[i].HasTexture("_Occlusion"))
                            {
                                renderer.sharedMaterials[i].SetTexture("_OcclusionMap", mats[i].GetTexture("_Occlusion"));
                            }

                            if (mats[i].HasTexture("_Height"))
                            {
                                renderer.sharedMaterials[i].SetTexture("_ParallaxMap", mats[i].GetTexture("_Height")) ;
                            }

                        }
                    }
                  
                }

                AssetDatabase.Refresh();
                AssetDatabase.SaveAssets();
            }
        }
    }
}

不知为何会有问题

using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;

public class ConvertURPLit : EditorWindow
{
    private static ConvertURPLit _myWindow;

    public Shader shader;


    [MenuItem("Tools/ConvertURPLit", false, priority = 20)]
    static void Init()
    {
        _myWindow = (ConvertURPLit) EditorWindow.GetWindow(typeof(ConvertURPLit), false, "替换shader", true); //创建窗口
        _myWindow.Show(); //展示
    }

    void OnGUI()
    {
        shader = EditorGUILayout.ObjectField("替换的shader", shader, typeof(Shader), false) as Shader;
        
        if (GUILayout.Button("转换"))
        {
            var objs = Selection.objects;
            if (objs.Length > 0 && shader)
            {
                foreach (var obj in objs)
                {
                    var renderers = obj.GetComponentsInChildren<Renderer>();
                    foreach (var renderer in renderers)
                    {
                        var mats = renderer.sharedMaterials;
                        var tempMats = new Material[renderer.sharedMaterials.Length];
                        tempMats = renderer.materials;

                        for (int i = 0; i <  mats.Length; i++)
                        {
                            Undo.RecordObject(renderer.sharedMaterials[i], "shader ssss");
                            renderer.sharedMaterials[i].shader = shader;
                            
                            if (mats[i].HasColor("_Color"))
                            {
                                tempMats[i].SetColor("_BaseColor",mats[i].GetColor("_Color"));
                            }
                            
                            if (mats[i].HasProperty("_Albedo"))
                            {
                                tempMats[i].mainTexture = mats[i].GetTexture("_Albedo");
                                tempMats[i].SetTexture("_BaseMap", mats[i].GetTexture("_Albedo"));
                                
                            }
                            
                            if (mats[i].HasTexture("_Metallic"))
                            {
                                tempMats[i].SetTexture("_MetallicGlossMap", mats[i].GetTexture("_Metallic"));
                                
                            }
                            
                            if (mats[i].HasProperty("_Normal"))
                            {
                                tempMats[i].SetTexture("_BumpMap", mats[i].GetTexture("_Normal"));
                                
                            }
                            
                            if (mats[i].HasProperty("_BumpMap"))
                            {
                                tempMats[i].SetTexture("_BumpMap", mats[i].GetTexture("_BumpMap"));
                                
                            }
                            
                            if (mats[i].HasProperty("_MainTex"))
                            {
                                // tempMats[i].mainTexture = mats[i].GetTexture("_MainTex");
                                // tempMats[i].SetTexture("_BaseMap", mats[i].GetTexture("_MainTex"));
                                renderer.material.SetTexture("_BaseMap", mats[i].GetTexture("_MainTex"));
                            }
                            
                            // if (mats[i].HasTexture("_MainTex"))
                            // {
                            //     tempMats[i].mainTexture = mats[i].GetTexture("_MainTex");
                            //     tempMats[i].SetTexture("_BaseMap", mats[i].GetTexture("_MainTex"));
                            // }

                            if (mats[i].HasTexture("_Occlusion"))
                            {
                                tempMats[i].SetTexture("_OcclusionMap", mats[i].GetTexture("_Occlusion"));
                            }

                            if (mats[i].HasTexture("_Height"))
                            {
                                tempMats[i].SetTexture("_ParallaxMap", mats[i].GetTexture("_Height")) ;
                            }

                        }

                        renderer.sharedMaterials = tempMats;
                    }
                    
                  
                }

                AssetDatabase.Refresh();
                AssetDatabase.SaveAssets();
            }
        }
    }
}