.NET Core 3.1下Azure Functions依赖解析NU1100错误求助

我正在开发一个包含访问计数功能的Azure Functions网站项目，跟着视频教程推进到对应步骤时，遇到了以下NU1100依赖解析错误：

error NU1100: Unable to resolve 'Microsoft.NET.Sdk.Functions (>= 3.1.1)' for '.NETCoreApp,Version=v3.1'
error NU1100: Unable to resolve 'Microsoft.NETCore.App.Ref (= 3.1.0)' for '.NETCoreApp,Version=v3.1'
error NU1100: Unable to resolve 'Microsoft.WindowsDesktop.App.Ref (= 3.1.0)' for '.NETCoreApp,Version=v3.1'
error NU1100: Unable to resolve 'Microsoft.AspNetCore.App.Ref (= 3.1.10)' for '.NETCoreApp,Version=v3.1'

我的开发环境是VS Code和Git Bash，已经尝试过以下方法但问题仍未解决：

• 手动解析依赖项
• 下载安装.NET 6.0 SDK及运行时（最初用.NET 6创建项目，后来因为教程使用3.0 LTS版本，改为了3.1）
• 下载安装NuGet

我对C#和Azure Functions开发经验不足，附上相关代码恳请帮助：

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;

namespace Company.Function
{
    public static class GetResumeCounter
    {
        [FunctionName("GetResumeCounter")]
        public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");

            string name = req.Query["name"];

            string requestBody = await new StreamReader(req.Body).ReadToEndAsync();
            dynamic data = JsonConvert.DeserializeObject(requestBody);
            name = name ?? data?.name;

            string responseMessage = string.IsNullOrEmpty(name)
                ? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
                : $"Hello, {name}. This HTTP triggered function executed successfully.";

            return new OkObjectResult(responseMessage);
        }
    }
}

内容的提问来源于stack exchange，提问作者stackacct16