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[C#/WEB API/.NETCORE] ControllerBase 클래스 : Response 속성을 사용해 파일 다운로드시 스트리밍 처리하기

■ ControllerBase 클래스의 Response 속성을 사용해 파일 다운로드시 스트리밍을 처리하는 방법을 보여준다. ▶ Controllers/TestController.cs


using Microsoft.AspNetCore.Mvc;
using Microsoft.Net.Http.Headers;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;

namespace TestProject.Controllers
{
    /// <summary>
    /// 테스트 컨트롤러
    /// </summary>
    [ApiController]
    [Route("api/[controller]")]
    public class TestController : Controller
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 값 리스트 구하기 - GetValueList() // GET api/test

        /// <summary>
        /// 값 리스트 구하기
        /// </summary>
        /// <returns>값 리스트</returns>
        [HttpGet]
        public List<string> GetValueList()
        {
            return new List<string> { "value1", "value2" };
        }

        #endregion
        #region 파일 다운로드 하기 - DownloadFile() // GET api/test/download

        /// <summary>
        /// 파일 다운로드 하기
        /// </summary>
        /// <returns>태스크</returns>
        [HttpGet]
        [Route("download")]
        public async Task DownloadFile()
        {
            string filePath = @"d:\The Best of New Age Music Collection.mp4";

            Response.Headers.Add(HeaderNames.ContentType       , "application/octet-stream");
            Response.Headers.Add(HeaderNames.ContentDisposition, $"attachment; filename=\"{Path.GetFileName(filePath)}\"" );

            Response.StatusCode = 200;

            Stream sourceStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
            Stream targetStream = Response.Body;

            int bufferSize = 1024;

            byte[] bufferByteArray = new byte[bufferSize];

            while(true)
            {
                int readCount = await sourceStream.ReadAsync(bufferByteArray, 0, bufferSize);

                if(readCount == 0)
                {
                    break;
                }

                await targetStream.WriteAsync(bufferByteArray, 0, readCount);
            }

            await targetStream.FlushAsync();
        }

        #endregion
    }
}

using Microsoft.AspNetCore.Mvc;

using Microsoft.Net.Http.Headers;

using System.Collections.Generic;

using System.IO;

using System.Threading.Tasks;

namespace TestProject.Controllers

{

/// <summary>

/// 테스트 컨트롤러

/// </summary>

[ApiController]

[Route("api/[controller]")]

public class TestController : Controller

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 값 리스트 구하기 - GetValueList() // GET api/test

/// <summary>

/// 값 리스트 구하기

/// </summary>

/// <returns>값 리스트</returns>

[HttpGet]

public List<string> GetValueList()

{

return new List<string> { "value1", "value2" };

}

#endregion

#region 파일 다운로드 하기 - DownloadFile() // GET api/test/download

/// <summary>

/// 파일 다운로드 하기

/// </summary>

/// <returns>태스크</returns>

[HttpGet]

[Route("download")]

public async Task DownloadFile()

{

string filePath = @"d:\The Best of New Age Music Collection.mp4";

Response.Headers.Add(HeaderNames.ContentType , "application/octet-stream");

Response.Headers.Add(HeaderNames.ContentDisposition, $"attachment; filename=\"{Path.GetFileName(filePath)}\"" );

Response.StatusCode = 200;

Stream sourceStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);

Stream targetStream = Response.Body;

int bufferSize = 1024;

byte[] bufferByteArray = new byte[bufferSize];

while(true)

{

int readCount = await sourceStream.ReadAsync(bufferByteArray, 0, bufferSize);

if(readCount == 0)

{

break;

}

await targetStream.WriteAsync(bufferByteArray, 0, readCount);

}

await targetStream.FlushAsync();

}

#endregion

}

TestProject.zip

[C#/ASP.NET MVC/.NETCORE] 파일 업로드/다운로드하기

■ 파일을 업로드/다운로드하는 방법을 보여준다. ▶ Controllers/TestController.cs


using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Net.Http.Headers;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;

namespace TestProject.Controllers
{
    /// <summary>
    /// 테스트 컨트롤러
    /// </summary>
    public class TestController : Controller
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Field
        ////////////////////////////////////////////////////////////////////////////////////////// Private

        #region Field

        /// <summary>
        /// 웹 호스트 환경
        /// </summary>
        private IWebHostEnvironment environment;

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 생성자 - TestController(environment)

        /// <summary>
        /// 생성자
        /// </summary>
        /// <param name="environment">웹 호스트 환경</param>
        public TestController(IWebHostEnvironment environment)
        {
            this.environment = environment;
        }

        #endregion

        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Public

        #region 업로드 페이지 처리하기 - Upload()

        /// <summary>
        /// 업로드 페이지 처리하기
        /// </summary>
        [HttpGet]
        public IActionResult Upload()
        {
            return View();
        }

        #endregion
        #region 업로드 페이지 처리하기 - Upload(fileCollection)

        /// <summary>
        /// 업로드 페이지 처리하기
        /// </summary>
        /// <param name="fileCollection">파일 컬렉션</param>
        /// <returns>액션 결과 태스크</returns>
        [HttpPost]
        public async Task<IActionResult> Upload(ICollection<IFormFile> fileCollection)
        {
            var uploadDirectoryPath = Path.Combine(this.environment.WebRootPath, "upload");

            foreach(IFormFile formFile in fileCollection)
            {
                if(formFile.Length > 0)
                {
                    string fileName = Path.GetFileName
                    (
                        ContentDispositionHeaderValue.Parse(formFile.ContentDisposition).FileName.Value
                    );

                    using(FileStream stream = new FileStream(Path.Combine(uploadDirectoryPath, fileName), FileMode.Create))
                    {
                        await formFile.CopyToAsync(stream);
                    }
                }
            }

            return View();
        }

        #endregion
        #region 다운로드 페이지 처리하기 - Download(fileName)

        /// <summary>
        /// 다운로드 페이지 처리하기
        /// </summary>
        public FileResult Download(string fileName = "Test.txt")
        {
            byte[] fileByteArray = System.IO.File.ReadAllBytes
            (
                Path.Combine(this.environment.WebRootPath, "upload", fileName)
            );

            return File(fileByteArray, "application/octet-stream", fileName);
        }

        #endregion
    }
}

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using Microsoft.AspNetCore.Hosting;

using Microsoft.AspNetCore.Http;

using Microsoft.AspNetCore.Mvc;

using Microsoft.Net.Http.Headers;

using System.Collections.Generic;

using System.IO;

using System.Threading.Tasks;

namespace TestProject.Controllers

{

/// <summary>

/// 테스트 컨트롤러

/// </summary>

public class TestController : Controller

{

//////////////////////////////////////////////////////////////////////////////////////////////////// Field

////////////////////////////////////////////////////////////////////////////////////////// Private

#region Field

/// <summary>

/// 웹 호스트 환경

/// </summary>

private IWebHostEnvironment environment;

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Constructor

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 생성자 - TestController(environment)

/// <summary>

/// 생성자

/// </summary>

/// <param name="environment">웹 호스트 환경</param>

public TestController(IWebHostEnvironment environment)

{

this.environment = environment;

}

#endregion

//////////////////////////////////////////////////////////////////////////////////////////////////// Method

////////////////////////////////////////////////////////////////////////////////////////// Public

#region 업로드 페이지 처리하기 - Upload()

/// <summary>

/// 업로드 페이지 처리하기

/// </summary>

[HttpGet]

public IActionResult Upload()

{

return View();

}

#endregion

#region 업로드 페이지 처리하기 - Upload(fileCollection)

/// <summary>

/// 업로드 페이지 처리하기

/// </summary>

/// <param name="fileCollection">파일 컬렉션</param>

/// <returns>액션 결과 태스크</returns>

[HttpPost]

public async Task<IActionResult> Upload(ICollection<IFormFile> fileCollection)

{

var uploadDirectoryPath = Path.Combine(this.environment.WebRootPath, "upload");

foreach(IFormFile formFile in fileCollection)

{

if(formFile.Length > 0)

{

string fileName = Path.GetFileName

(

ContentDispositionHeaderValue.Parse(formFile.ContentDisposition).FileName.Value

);

using(FileStream stream = new FileStream(Path.Combine(uploadDirectoryPath, fileName), FileMode.Create))

{

await formFile.CopyToAsync(stream);

}

return View();

}

#endregion

#region 다운로드 페이지 처리하기 - Download(fileName)

/// <summary>

/// 다운로드 페이지 처리하기

/// </summary>

public FileResult Download(string fileName = "Test.txt")

{

byte[] fileByteArray = System.IO.File.ReadAllBytes

(

Path.Combine(this.environment.WebRootPath, "upload", fileName)

);

return File(fileByteArray, "application/octet-stream", fileName);

}

#endregion

}

▶ Views/Test/Upload.cshtml


@{
    Layout = null;
}
<p>파일 업로드/다운로드하기</p>
<hr />
<form asp-controller="Test" asp-action="Upload"
    method="post"
    enctype="multipart/form-data">
    <p><input type="file" name="fileCollection" multiple /></p>
    <p><input type="submit" value="업로드" /></p>
</form>

Layout = null;

}

<p>파일 업로드/다운로드하기</p>

<hr />

<form asp-controller="Test" asp-action="Upload"

method="post"

enctype="multipart/form-data">

</form>

※ wwwroot 폴더에서 upload 폴더를 생성한다. ※ 파일 다운로드 URL은 아래를