我项目中有一个通用的上传、下载、删除文件的方法，FileAppService，代码如下：
using FileStorage
.FileManagement
.Dto;
using Microsoft
.VisualBasic
.FileIO;
using System;
using System
.Collections
.Generic;
using System
.ComponentModel;
using System
.IO;
using System
.IO
.Pipes;
using System
.Linq;
using System
.Text;
using System
.Threading
.Tasks;
using Volo
.Abp;
using Volo
.Abp
.Application
.Services;
using Volo
.Abp
.BlobStoring;
using Volo
.Abp
.Domain
.Repositories;
using static OnMonitor
.OnMonitorApplicationModule;
using static System
.Net
.WebRequestMethods;
namespace OnMonitor
.FlieManagement
{
// 应用服务实现
public class FileAppService : ApplicationService, IFileAppService
{
// 注入自定义容器（头像和文档）
private readonly IBlobContainer<FlieContainer> _flieContainer;
private readonly IBlobContainer<DocumentContainer> _documentContainer;
private readonly IRepository<AbpFileInfo, Guid> _repository;
private readonly IBlobContainer<DrawingDataContainer> _drawingDataContainer;
private readonly IBlobContainer<DrawingCADContainer> _drawingCADContainer;
private readonly IBlobContainer<DrawingPDFContainer> _drawingPDFContainer;
public FileAppService(
IBlobContainer<FlieContainer> flieContainer,
IBlobContainer<DocumentContainer> documentContainer,
IRepository<AbpFileInfo, Guid> repository,
IBlobContainer<DrawingDataContainer> drawingDataContainer,
IBlobContainer<DrawingCADContainer> drawingCADContainer,
IBlobContainer<DrawingPDFContainer> drawingPDFContainer )
{
_flieContainer = flieContainer;
_documentContainer = documentContainer;
_repository = repository;
_drawingDataContainer = drawingDataContainer;
_drawingCADContainer = drawingCADContainer;
_drawingPDFContainer = drawingPDFContainer;
}
/// <summary>
/// 上传文档（存储到DocumentContainer）
/// </summary>
public async Task<FileInfoDto> UploadFlieAsync(byte[] byteFile, string name, string? containerName="")
{
if (containerName == null)
{
containerName = "file";
}
// 根据容器名获取对应的容器实例
var container = GetContainerByContainerName(containerName);
var fileExtension = Path
.GetExtension(name);
var size = byteFile
.Length
.ToString();
string uploadsFolder = Path
.Combine(Environment
.CurrentDirectory, "wwwroot", "Files");
if (!Directory
.Exists(uploadsFolder))
{
Directory
.CreateDirectory(uploadsFolder);
}
var uniqueFileName =
DateTime.Now.ToString("yyyyMMddHHmmss") + name;
string filePath = Path
.Combine(uploadsFolder, uniqueFileName);
// 上传文件流到容器
using (var stream = new MemoryStream(byteFile))
{
await container
.SaveAsync(uniqueFileName, stream, overrideExisting: true);
}
AbpFileInfo fileInfo = new AbpFileInfo()
{
Name = name,
RealName = uniqueFileName,
Suffix = fileExtension,
Size = size,
Path = filePath,
BlobName = uniqueFileName,
ContainerName = containerName,
FlieType = "File"
};
//TODO：文件md5哈希校验
var result = await _repository
.InsertAsync(fileInfo);
return ObjectMapper
.Map<AbpFileInfo, FileInfoDto>(result);
}
/// <summary>
/// 下载文件
/// </summary>
public async Task<FileDto> DownloadAsync(string blobName, string? containerName = "")
{
// 根据容器名获取对应的容器实例
var container = GetContainerByContainerName(containerName);
// 检查文件是否
存在
if (!await container
.ExistsAsync(blobName))
{
throw new UserFriendlyException("文件不
存在");
}
// 读取文件流
using (var stream = await container
.GetAsync(blobName))
{
using (var memoryStream = new MemoryStream())
{
await stream
.CopyToAsync(memoryStream);
return new FileDto
{
Content = memoryStream
.ToArray
(),
FileName = blobName // 可替换为原文件名
};
}
}
}
/// <summary>
/// 删除文件
/// </summary>
public async Task DeleteAsync(string blobName, string? containerName = "")
{
var container = GetContainerByContainerName(containerName);
await container
.DeleteAsync(blobName);
}
public async Task<List<FileInfoDto>> GetAllAsync(string? containerName = "")
{
if (containerName == null)
{
containerName = "file";
}
var data= await _repository
.GetListAsync();
var result=data
.Where(u=>u
.ContainerName
.Contains(containerName))
.ToList();
return ObjectMapper
.Map<List<AbpFileInfo>,List<FileInfoDto>>(result); ;
}
/// <summary>
/// 根据容器名获取容器实例（辅助方法）
/// </summary>
private IBlobContainer GetContainerByContainerName(string? containerName="")
{
if (containerName == "")
{
containerName = "file";
}
return containerName switch
{
"file" => _flieContainer,
"documents" => _documentContainer,
"drawingData" => _drawingDataContainer,
"drawingCAD" => _drawingCADContainer,
"drawingPDF" => _drawingPDFContainer,
_ => throw new UserFriendlyException("无效的容器名")
};
}
}
}
本文探讨了在C#中使用DateTime.Now.ToString()可能带来的跨地区时间显示不一致的问题，强调了通过指定统一的格式字符串来确保时间显示一致性的重要性，以避免潜在的程序错误。
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