.net core webapi 大文件上传到wwwroot文件夹的操作代码

 app.usestaticfiles();

namespace webapi;
/// <summary>
/// 统一数据响应格式
/// </summary>
public class results<t>
{
    /// <summary>
    /// 自定义的响应码，可以和http响应码一致，也可以不一致
    /// </summary>
    public int code { get; set; }
    /// <summary>
    /// 中文消息提示
    /// </summary>
    public string? msg { get; set; }
    /// <summary>
    /// 是否成功
    /// </summary>
    public bool success { get; set; }
    /// <summary>
    /// 响应的数据
    /// </summary>
    public t? data { get; set; }
    /// <summary>
    /// 返回的token: 如果有值，则前端需要此这个值替旧的token值
    /// </summary>
    public string? token { get; set; }
    /// <summary>
    /// 设置数据的结果
    /// </summary>
    /// <param name="data">数据</param>
    /// <returns></returns>
    public static results<t> dataresult(t data)
    {
        return new results<t> { code = 1, data = data, msg = "请求成功", success = true };
    }
    /// <summary>
    /// 响应成功的结果
    /// </summary>
    /// <param name="msg"></param>
    /// <returns></returns>
    public static results<t> successresult(string msg = "操作成功")
    {
        return new results<t> { code = 1, data = default, msg = msg, success = true };
    }
    /// <summary>
    /// 响应失败的结果
    /// </summary>
    /// <param name="msg"></param>
    /// <returns></returns>
    public static results<t> failresult(string msg = "请求失败")
    {
        return new results<t> { code = -1, data = default, msg = msg, success = false };
    }
    /// <summary>
    /// 参数有误
    /// </summary>
    /// <param name="msg"></param>
    /// <returns></returns>
    public static results<t> invalidparameter(string msg = "参数有误")
    {
        return new results<t> { code = -1, data = default, msg = msg, success = false };
    }
    /// <summary>
    /// 获取结果
    /// </summary>
    /// <param name="code"></param>
    /// <param name="msg"></param>
    /// <param name="data"></param>
    /// <param name="success"></param>
    /// <returns></returns>
    public static results<t> getresult(int code = 0, string? msg = null, t? data = default, bool success = true)
    {
        return new results<t> { code = code, data = data, msg = msg, success = success };
    }
    /// <summary>
    /// 设置token结果
    /// </summary>
    /// <param name="token"></param>
    /// <returns></returns>
    public static results<t> tokenresult(string token)
    {
        return new results<t> { code = 1, data = default, msg = "请求成功", success = true, token = token };
    }
}

using microsoft.aspnetcore.mvc;
using microsoft.aspnetcore.webutilities;
using microsoft.net.http.headers;
namespace webapi.controllers;
/// <summary>
/// 文件上传
/// </summary>
[apicontroller]
[route("[controller]/[action]")]
public class uploadcontroller : controllerbase
{
    private readonly iwebhostenvironment _hostenvironment;
    /// <summary>
    /// 注入服务
    /// </summary>
    /// <param name="hostenvironment"></param>
    public uploadcontroller(iwebhostenvironment hostenvironment)
    {
        _hostenvironment = hostenvironment;
    }
    /// <summary>
    /// 上传文件（支持多文件/大文件500m）
    /// </summary>
    /// <returns></returns>
    [httppost]
    [requestformlimits(multipartbodylengthlimit = 609715200)]
    [requestsizelimit(609715200)]
    public async task<results<list<string>>> uploadfile()
    {
        var request = httpcontext.request;
        if (!request.hasformcontenttype ||
            !mediatypeheadervalue.tryparse(request.contenttype, out var mediatypeheader) ||
            string.isnullorempty(mediatypeheader.boundary.value))
        {
            return results<list<string>>.failresult("文件类型不支持");
        }
        var reader = new multipartreader(mediatypeheader.boundary.value, request.body);
        var section = await reader.readnextsectionasync();
        list<string> serverfilepathlist = new();
        while (section != null)
        {
            var hascontentdispositionheader = contentdispositionheadervalue.tryparse(section.contentdisposition,
                out var contentdisposition);
            if (hascontentdispositionheader && contentdisposition!.dispositiontype.equals("form-data") &&
                !string.isnullorempty(contentdisposition.filename.value))
            {
                // 获取文件后缀名
                var extension = path.getextension(contentdisposition.filename.value);
                // 为文件重命名，防止文件重名
                var filename = datetime.now.tostring("yyyymmddhhmmssfff") + extension;
                // 文件保存的文件夹路径
                var uploadpath = path.combine(_hostenvironment.webrootpath, "upload");
                if (!directory.exists(uploadpath))
                {
                    directory.createdirectory(uploadpath);
                }
                var filefullpath = path.combine(uploadpath, filename);
                try
                {
                    using var targetstream = system.io.file.create(filefullpath);
                    await section.body.copytoasync(targetstream);
                    serverfilepathlist.add("/upload/" + filename);
                }
                catch (exception e)
                {
                    console.writeline(e);
                }
            }
            section = await reader.readnextsectionasync();
        }
        return results<list<string>>.dataresult(serverfilepathlist);
    }
}