要在Blazor服务器中获取SharePoint列表，您可以使用SharePoint REST API来实现。以下是一个示例代码，演示了如何使用Blazor服务器来获取SharePoint列表：

1. 在Blazor服务器项目中，创建一个名为"SharePointService.cs"的类，并添加以下代码：

using Microsoft.Extensions.Configuration;
using Newtonsoft.Json.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

public class SharePointService
{
    private readonly IConfiguration _configuration;
    private readonly HttpClient _httpClient;

    public SharePointService(IConfiguration configuration, HttpClient httpClient)
    {
        _configuration = configuration;
        _httpClient = httpClient;
    }

    public async Task GetListItems(string listName)
    {
        string siteUrl = _configuration.GetSection("SharePointSiteUrl").Value;
        string apiUrl = $"{siteUrl}/_api/web/lists/getbytitle('{listName}')/items";

        _httpClient.DefaultRequestHeaders.Accept.Clear();
        _httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        HttpResponseMessage response = await _httpClient.GetAsync(apiUrl);
        response.EnsureSuccessStatusCode();

        string responseBody = await response.Content.ReadAsStringAsync();
        JObject result = JObject.Parse(responseBody);

        return result;
    }
}

2. 在Blazor服务器项目的"Startup.cs"文件中，添加以下代码：

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddRazorPages();
        services.AddServerSideBlazor();
        services.AddHttpClient();
        services.AddSingleton();
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();

        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapBlazorHub();
            endpoints.MapFallbackToPage("/_Host");
        });
    }
}

3. 在Blazor服务器项目的"Index.razor"文件中，添加以下代码：

@page "/"

@inject SharePointService SharePointService

SharePoint List Items

@if (listItems != null)
{
    foreach (var item in listItems["value"])
    {
        
@item["Title"]
    }
}

@code {
    private JObject listItems;

    protected override async Task OnInitializedAsync()
    {
        listItems = await SharePointService.GetListItems("YourListName");
    }
}

请确保在appsettings.json文件中设置了"SharePointSiteUrl"配置项，该配置项的值为SharePoint网站的URL。

以上代码演示了如何在Blazor服务器中使用HttpClient来调用SharePoint REST API并获取列表项。您可以根据您的实际需求进行修改和扩展。