| 导读 | 这篇文章主要为大家详细介绍了ASP.NET Core实现文件上传和下载，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下 |
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
一、文件上传
1.1 获取文件后缀
/// < summary>
/// 获取文件后缀
/// < /summary>
/// < param name="fileName">文件名称< /param>
/// < returns>
public async static Task GetFileSuffixAsync(string fileName)
{
return await Task.Run(() =>
{
string suffix = Path.GetExtension(fileName);
return suffix;
});
}
1.2 上传单文件
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
};
}
}
/// < 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 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
/// < 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> UploadFilesAsync(IFormFileCollection files, string fold)
{
string path = Directory.GetCurrentDirectory() + @"/Upload/" + fold + "/";
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
List messages = new List ();
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;
}
[Route("api/[controller]")]
[ApiController]
public class ManageProtocolFileController : ControllerBase
{
private readonly string createName = "";
private readonly IWebHostEnvironment _env;
private readonly ILogger _logger;
public ManageProtocolFileController(IWebHostEnvironment env,
ILogger logger)
{
_env = env;
_logger = logger;
}
/// < summary>
/// 协议上传附件
/// < /summary>
/// < param name="file">< /param>
/// < returns>< /returns>
[HttpPost("upload")]
public async Task UploadProtocolFile([FromForm] IFormFile file)
{
return await UploadFileAsync(file, "ManageProtocol");
}
}
二、文件下载
2.1 获取ContentType属性
/// < summary>
/// 获取文件ContentType
/// < /summary>
/// < param name="fileName">文件名称< /param>
/// < returns>< /returns>
public async static Task 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
[Route("api/[controller]")]
[ApiController]
public class ManageProtocolFileController : ControllerBase
{
private readonly string createName = "";
private readonly IWebHostEnvironment _env;
private readonly ILogger _logger;
public ManageProtocolFileController(IWebHostEnvironment env,
ILogger logger)
{
_env = env;
_logger = logger;
}
/// < summary>
/// 下载附件
/// < /summary>
/// < param name="fileName">文件名称
/// < returns>< /returns>
[HttpGet("download")]
public async Task 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());
}
}
}
原文来自：https://www.jb51.net/article/256866.htm
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