一个c# abp framework 项目 Authors.razor.cs文件出现问题

一个学习项目
没怎么学过c#
不知道怎么改

有三处错误

完整代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using BookStore.Authors;
using BookStore.Permissions;
using Blazorise;
using Blazorise.DataGrid;
using Microsoft.AspNetCore.Authorization;
using Volo.Abp.Application.Dtos;

namespace BookStore.Blazor.Pages
{
    public partial class Authors
    {
        private IReadOnlyList<AuthorDto> AuthorList { get; set; }

        private int PageSize { get; } = LimitedResultRequestDto.DefaultMaxResultCount;
        private int CurrentPage { get; set; }
        private string CurrentSorting { get; set; }
        private int TotalCount { get; set; }

        private bool CanCreateAuthor { get; set; }
        private bool CanEditAuthor { get; set; }
        private bool CanDeleteAuthor { get; set; }

        private CreateAuthorDto NewAuthor { get; set; }

        private Guid EditingAuthorId { get; set; }
        private UpdateAuthorDto EditingAuthor { get; set; }

        private Modal CreateAuthorModal { get; set; }
        private Modal EditAuthorModal { get; set; }

        private Validations CreateValidationsRef;

        private Validations EditValidationsRef;

        public Authors()
        {
            NewAuthor = new CreateAuthorDto();
            EditingAuthor = new UpdateAuthorDto();
        }

        protected override async Task OnInitializedAsync()
        {
            await SetPermissionsAsync();
            await GetAuthorsAsync();
        }

        private async Task SetPermissionsAsync()
        {
            CanCreateAuthor = await AuthorizationService
                .IsGrantedAsync(BookStorePermissions.Authors.Create);

            CanEditAuthor = await AuthorizationService
                .IsGrantedAsync(BookStorePermissions.Authors.Edit);

            CanDeleteAuthor = await AuthorizationService
                .IsGrantedAsync(BookStorePermissions.Authors.Delete);
        }

        private async Task GetAuthorsAsync()
        {
            var result = await AuthorAppService.GetListAsync(
                new GetAuthorListDto
                {
                    MaxResultCount = PageSize,
                    SkipCount = CurrentPage * PageSize,
                    Sorting = CurrentSorting
                }
            );

            AuthorList = result.Items;
            TotalCount = (int)result.TotalCount;
        }

        private async Task OnDataGridReadAsync(DataGridReadDataEventArgs<AuthorDto> e)
        {
            CurrentSorting = e.Columns
                .Where(c => c.Direction != SortDirection.None)
                .Select(c => c.Field + (c.Direction == SortDirection.Descending ? " DESC" : ""))
                .JoinAsString(",");
            CurrentPage = e.Page - 1;

            await GetAuthorsAsync();

            await InvokeAsync(StateHasChanged);
        }

        private void OpenCreateAuthorModal()
        {
            CreateValidationsRef.ClearAll();

            NewAuthor = new CreateAuthorDto();
            CreateAuthorModal.Show();
        }

        private void CloseCreateAuthorModal()
        {
            CreateAuthorModal.Hide();
        }

        private void OpenEditAuthorModal(AuthorDto author)
        {
            EditValidationsRef.ClearAll();

            EditingAuthorId = author.Id;
            EditingAuthor = ObjectMapper.Map<AuthorDto, UpdateAuthorDto>(author);
            EditAuthorModal.Show();
        }

        private async Task DeleteAuthorAsync(AuthorDto author)
        {
            var confirmMessage = L["AuthorDeletionConfirmationMessage", author.Name];
            if (!await Message.Confirm(confirmMessage))
            {
                return;
            }

            await AuthorAppService.DeleteAsync(author.Id);
            await GetAuthorsAsync();
        }

        private void CloseEditAuthorModal()
        {
            EditAuthorModal.Hide();
        }

        private async Task CreateAuthorAsync()
        {
            if (CreateValidationsRef.ValidateAll())
            {
                await AuthorAppService.CreateAsync(NewAuthor);
                await GetAuthorsAsync();
                CreateAuthorModal.Hide();
            }
        }

        private async Task UpdateAuthorAsync()
        {
            if (EditValidationsRef.ValidateAll())
            {
                await AuthorAppService.UpdateAsync(EditingAuthorId, EditingAuthor);
                await GetAuthorsAsync();
                EditAuthorModal.Hide();
            }
        }
    }
}

是 https://docs.abp.io/zh-Hans/abp/latest/Tutorials/Part-9?UI=Blazor&DB=EF#%E8%BF%90%E8%A1%8C%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F 跟着这里步骤来的，除了命名不同，其他都一样，都是不知道为什么有错误

原因
可能就是命名导致的错误

解决方法
报错中的第一条提示某个变量未定义，ctrl+F全局搜索下 这个变量是否定义
可能是拼写方面的错误

如有问题及时沟通