dotnet new webapi -n LargeFileUploadDemo
cd LargeFileUploadDemo

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.IO;
using System.Threading.Tasks;

namespace LargeFileUploadDemo.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class UploadController : ControllerBase
    {
        // 臨時文件存儲路徑
        private readonly string _tempFolder = Path.Combine(Directory.GetCurrentDirectory(), "TempUploads");

        public UploadController()
        {
            if (!Directory.Exists(_tempFolder))
            {
                Directory.CreateDirectory(_tempFolder);
            }
        }

        [HttpPost("uploadFile")]
        public async Task<IActionResult> UploadFile(IFormFile file)
        {
            // 檢查文件是否為空
            if (file == null || file.Length == 0)
            {
                return BadRequest("No file uploaded.");
            }

            var filePath = Path.Combine(_tempFolder, file.FileName);

            // 將文件保存到服務(wù)器
            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                await file.CopyToAsync(stream);
            }

            return Ok(new { FilePath = filePath });
        }

        // 上傳分塊文件
        [HttpPost("uploadChunk")]
        public async Task<IActionResult> UploadChunk(IFormFile file, int chunkIndex, string fileName)
        {
            if (file == null || file.Length == 0)
            {
                return BadRequest("No chunk file uploaded.");
            }

            var chunkFilePath = Path.Combine(_tempFolder, $"{fileName}.part{chunkIndex}");

            // 保存分塊文件
            using (var stream = new FileStream(chunkFilePath, FileMode.Create))
            {
                await file.CopyToAsync(stream);
            }

            return Ok(new { Status = "Chunk uploaded successfully" });
        }
    }
}

<input type="file" id="fileInput" />
<button onclick="uploadFile()">Upload</button>

<script>
    async function uploadFile() {
        const fileInput = document.getElementById("fileInput");
        const file = fileInput.files[0];
        const chunkSize = 5 * 1024 * 1024; // 5MB per chunk
        const totalChunks = Math.ceil(file.size / chunkSize);
        const fileName = file.name;

        for (let i = 0; i < totalChunks; i++) {
            const start = i * chunkSize;
            const end = Math.min(start + chunkSize, file.size);
            const chunk = file.slice(start, end);
            
            const formData = new FormData();
            formData.append("file", chunk);
            formData.append("chunkIndex", i);
            formData.append("fileName", fileName);
            
            // 上傳分塊
            await fetch('http://localhost:5000/api/upload/uploadChunk', {
                method: 'POST',
                body: formData
            });
        }
        alert("File upload complete!");
    }
</script>

// 檢查分塊是否已經(jīng)上傳
public bool IsChunkUploaded(string fileName, int chunkIndex)
{
    var chunkFilePath = Path.Combine(_tempFolder, $"{fileName}.part{chunkIndex}");
    return File.Exists(chunkFilePath);
}