C#中List.Contains(T)失效的解决方法

     public void RemoveCustomMaterialInfo(MaterialInfo info)
        {
            if (m_MaterialList == null)
            {
                return;
            }

            if (m_MaterialList.Contain(info))
            {
                m_MaterialList.Remove(info);
                Debug.Log($"删除 ：info: {info.serial}, {info.serial}, {info.velocity},{info.note}, left : {this.m_MaterialList.Count}");

                //存储本地
                //var content = JsonUtility.ToJson(this.m_MaterialList);
                var content = JsonConvert.SerializeObject(GetMaterialInfoListBySerial("自定义"));
                File.WriteAllTextAsync(MaterialCustomConfigPath, content);
            }
        }

       private bool Contain(MaterialInfo materialInfo)
        {
            if (this.m_MaterialList == null)
            {
                return false;
            }

            return m_MaterialList.Exists(
                info => info.serial.Equals(materialInfo.serial) && info.type.Equals(materialInfo.type)
                                                                && info.velocity.Equals(materialInfo.velocity)
                                                                && info.note.Equals(materialInfo.note));
        }