本文实例为大家分享了ASP.NET Core实现文件上传和下载的具体代码，供大家参考，具体内容如下
1.1 获取文件后缀
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/// <summary> /// 获取文件后缀 /// </summary> /// <param name="fileName">文件名称</param> /// <returns></returns> public async static Task<string> GetFileSuffixAsync(string fileName) { return await Task.Run(() => { string suffix = Path.GetExtension(fileName); return suffix; }); } |
1.2 上传单文件
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public class FileMessage { /// <summary> /// 原文件名称 /// </summary> public string FileName { get; set; } /// <summary> /// 附件名称(协议或其他要进行数据库保存与模型绑定的命名) /// </summary> public string ArgumentName { get; set; } /// <summary> /// 文件大小(KB) /// </summary> public string FileSize { get; set; } /// <summary> /// -1：上传失败 0：等待上传 1：已上传 /// </summary> public int FileStatus { get; set; } /// <summary> /// 上传结果 /// </summary> public string UploadResult { get; set; } /// <summary> /// 创建实例 /// </summary> /// <param name="fileName">原文件名称</param> /// <param name="argumentName">(新)附件名称</param> /// <param name="fileSize">大小</param> /// <param name="fileStatus">文件状态</param> /// <returns></returns> public static FileMessage CreateNew(string fileName, string argumentName, string fileSize, int fileStatus, string uploadResult) { return new FileMessage() { FileName = fileName, ArgumentName = argumentName, FileSize = fileSize, FileStatus = fileStatus, UploadResult = uploadResult }; } } |
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/// <summary> /// 上传文件 /// </summary> /// <param name="file">上传的文件</param> /// <param name="fold">要存储的文件夹</param> /// <returns></returns> public async static Task<FileMessage> UploadFileAsync(IFormFile file, string fold) { string fileName = file.FileName; string path = Directory.GetCurrentDirectory() + @"/Upload/" + fold + "/"; if (!Directory.Exists(path)) { Directory.CreateDirectory(path); } string argumentName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + await GetFileSuffixAsync(file.FileName); string fileSize = Math.Round((decimal)file.Length / 1024, 2) + "k"; string filePath = Path.Combine(path, argumentName); try { using (FileStream stream = new FileStream(filePath, FileMode.Create)) { await file.CopyToAsync(stream); } return FileMessage.CreateNew(fileName, argumentName, fileSize, 1, "文件上传成功"); } catch (Exception e) { return FileMessage.CreateNew(fileName, argumentName, fileSize, -1, "文件上传失败：" + e.Message); } } |
1.3 上传多文件
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/// <summary> /// 上传多文件 /// </summary> /// <param name="files">上传的文件集合</param> /// <param name="fold">要存储的文件夹</param> /// <returns></returns> public async static Task<List<FileMessage>> UploadFilesAsync(IFormFileCollection files, string fold) { string path = Directory.GetCurrentDirectory() + @"/Upload/" + fold + "/"; if (!Directory.Exists(path)) { Directory.CreateDirectory(path); } List<FileMessage> messages = new List<FileMessage>(); foreach (var file in files) { string fileName = file.FileName; string argumentName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + await GetFileSuffixAsync(file.FileName); string fileSize = Math.Round((decimal)file.Length / 1024, 2) + "k"; string filePath = Path.Combine(path, argumentName); try { using (FileStream stream = new FileStream(filePath, FileMode.Create)) { await file.CopyToAsync(stream); } messages.Add(FileMessage.CreateNew(fileName, argumentName, fileSize, 1, "文件上传成功")); } catch (Exception e) { messages.Add(FileMessage.CreateNew(fileName, argumentName, fileSize, -1, "文件上传失败，失败原因：" + e.Message)); } } return messages; } |
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[Route("api/[controller]")] [ApiController] public class ManageProtocolFileController : ControllerBase { private readonly string createName = ""; private readonly IWebHostEnvironment _env; private readonly ILogger<ManageProtocolFileController> _logger; public ManageProtocolFileController(IWebHostEnvironment env, ILogger<ManageProtocolFileController> logger) { _env = env; _logger = logger; } /// <summary> /// 协议上传附件 /// </summary> /// <param name="file"></param> /// <returns></returns> [HttpPost("upload")] public async Task<FileMessage> UploadProtocolFile([FromForm] IFormFile file) { return await UploadFileAsync(file, "ManageProtocol"); } } |
2.1 获取ContentType属性
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/// <summary> /// 获取文件ContentType /// </summary> /// <param name="fileName">文件名称</param> /// <returns></returns> public async static Task<string> GetFileContentTypeAsync(string fileName) { return await Task.Run(() => { string suffix = Path.GetExtension(fileName); var provider = new FileExtensionContentTypeProvider(); var contentType = provider.Mappings[suffix]; return contentType; }); } |
2.2 执行下载
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[Route("api/[controller]")] [ApiController] public class ManageProtocolFileController : ControllerBase { private readonly string createName = ""; private readonly IWebHostEnvironment _env; private readonly ILogger<ManageProtocolFileController> _logger; public ManageProtocolFileController(IWebHostEnvironment env, ILogger<ManageProtocolFileController> logger) { _env = env; _logger = logger; } /// <summary> /// 下载附件 /// </summary> /// <param name="fileName">文件名称</param> /// <returns></returns> [HttpGet("download")] public async Task<FileStreamResult> Download([FromQuery] string fileName) { try { string rootPath = _env.ContentRootPath + @"/Upload/ManageProtocolFile"; string filePath = Path.Combine(rootPath, fileName); var stream = System.IO.File.OpenRead(filePath); string contentType = await GetFileContentTypeAsync(fileName); _logger.LogInformation("用户:" + createName + "下载后台客户协议附件:" + request.FileName); return File(stream, contentType, fileName); } catch (Exception e) { _logger.LogError(e, "用户:" + createName + "下载后台客户协议附件出错，出错原因:" + e.Message); throw new Exception(e.ToString()); } } } |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持易盾网络。
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