.net framework分片上传，最佳实践
核心代码：
///
/// 上传分片文件
///
/// UploadChunk()
{
try
{
var provider = new MultipartFormDataStreamProvider(Path.GetTempPath());
await Request.Content.ReadAsMultipartAsync(provider);
var chunk = new ChunkEntity()
{
ChunkNumber = int.Parse(provider.FormData.GetValues("chunkNumber").FirstOrDefault()),
ChunkSize = long.Parse(provider.FormData.GetValues("chunkSize").FirstOrDefault()),
CurrentChunkSize = long.Parse(provider.FormData.GetValues("currentChunkSize").FirstOrDefault()),
TotalSize = long.Parse(provider.FormData.GetValues("totalSize").FirstOrDefault()),
Identifier = provider.FormData.GetValues("identifier").FirstOrDefault(),
Filename = provider.FormData.GetValues("filename").FirstOrDefault(),
RelativePath = provider.FormData.GetValues("relativePath").FirstOrDefault(),
TotalChunks = int.Parse(provider.FormData.GetValues("totalChunks").FirstOrDefault()),
};
var file = provider.FileData.FirstOrDefault();
Console.WriteLine($"file originName: {file.LocalFileName}, chunkNumber: { chunk.ChunkNumber}");
string root = @"E:\代码练习\dotNetPractiseCollect\chunk-files\files-storege";// your local path
if (!Directory.Exists(root)) Directory.CreateDirectory(root);
var filePath = file.LocalFileName;
var rawFileBytes = File.ReadAllBytes(filePath);
// 将文件移动到指定文件夹
var targetFilePath = GenerateUploadPath(root, chunk);
File.WriteAllBytes(targetFilePath, rawFileBytes);
//保存分片记录
using (var db = new SqlSugarClient(new ConnectionConfig()
{
ConnectionString = "Server=localhost;Port=3306;Database=test;Uid=root;Pwd=123456;",
DbType = DbType.MySql, // 数据库类型
IsAutoCloseConnection = true, // 自动释放连接，避免内存泄漏
}))
{
Guid guid = Guid.NewGuid();
chunk.Id = BitConverter.ToInt64(guid.ToByteArray(), 0);
db.Insertable(chunk).ExecuteCommand();
}
return Request.CreateResponse(HttpStatusCode.OK, "文件上传成功");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "服务器内部异常");
}
}
///
/// 检查分片文件
///
///
///
/// 合并分片文件
///
///
/// MergeFileAsync([FromBody] MergeFileDto fileInfo)
{
try
{
string filename = fileInfo.Filename;
string uploadFolder = @"E:\代码练习\dotNetPractiseCollect\chunk-files\files-storege";// your local path
var file = uploadFolder + "/" + fileInfo.Identifier + "/" + filename;
var folder = uploadFolder + "/" + fileInfo.Identifier;
var isMergeOk = await MergeChunkFilesAsync(file, folder, filename);
using (var db = new SqlSugarClient(new ConnectionConfig()
{
ConnectionString = "Server=localhost;Port=3306;Database=test;Uid=root;Pwd=123456;",
DbType = DbType.MySql, // 数据库类型
IsAutoCloseConnection = true, // 自动释放连接，避免内存泄漏
}))
{
db.Deleteable().Where(x => x.Identifier == fileInfo.Identifier).ExecuteCommand();
}
if (isMergeOk == false)
{
Console.WriteLine("合成的文件：" + filename);
return Request.CreateResponse(HttpStatusCode.BadRequest, "合并失败");
}
return Request.CreateResponse(HttpStatusCode.BadRequest, "合并失败");
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "服务器内部异常");
}
}
///
/// 查询分片是否存在
///
///
///
/// true:分片存在，false:分片不存在
private bool checkChunk(string identifier, int chunkNumber)
{
try
{
using (var db = new SqlSugarClient(new ConnectionConfig()
{
ConnectionString = "Server=localhost;Port=3306;Database=test;Uid=root;Pwd=123456;",
DbType = DbType.MySql, // 数据库类型
IsAutoCloseConnection = true, // 自动释放连接，避免内存泄漏
}))
{
var flag = db.Queryable().Where(x => x.Identifier == identifier && x.ChunkNumber == chunkNumber).Count() > 0;
return flag;
}
}
catch (Exception e)
{
Console.WriteLine(e);
return false;
}
}
///
/// 生成上传文件路径
///
///
///
///
/// 分片文件合并
///
/// 目标文件名
/// 源文件所在目录
/// 需要排除的文件名
/// 返回是否成功合并
private async Task MergeChunkFilesAsync(string targetFile, string folder, string filename)
{
DirectoryInfo directory = new DirectoryInfo(folder);
var files = directory.GetFiles();
// 根据文件名中的“-”进行排序，按照降序排列
var paths = new List();
foreach (var item in files)
{
var ext = Path.GetExtension(item.FullName);
if (ext.Contains("-"))
{
paths.Add(item.FullName);
}
}
paths = paths.OrderBy(path => int.Parse(path.Split('-').Last())).ToList();
if (System.IO.File.Exists(targetFile))
{
System.IO.File.Delete(targetFile);
}
using (var fileStream = new FileStream(targetFile, FileMode.Create))
{
// 依次将非排除文件的内容追加到目标文件中，并删除源文件
foreach (var path in paths)
{
var saveFile = files.Where(x => x.FullName == path).FirstOrDefault();
using (FileStream fileChunk = new FileStream(saveFile.FullName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
await fileChunk.CopyToAsync(fileStream);
}
//合并后删除该块
File.Delete(saveFile.FullName);
}
}
return true;
} 完整前后端代码如下，请慢慢享用。
dotNetPractiseCollect/chunk-files at master · LeoMingGit/dotNetPractiseCollect · GitHub