Dotnet Core MVC C# 檔案上傳 使用Azure Blob 上傳、下載、刪除、複製
檔案及目錄操作
安裝套件
使用NuGet 搜尋 Azure.Storage.Blobs
建立Service
using Azure.Storage.Blobs;
namespace BlobWeb.Service
{
public class BlobService
{
private readonly string _connString = "連線字串";
/// <summary>
/// 上傳檔案到Azure Blob
/// </summary>
/// <param name="containerName">容器名稱</param>
/// <param name="directoryPath">容器內的目錄 e.g. Images/User01</param>
/// <param name="fileName">檔名 e.g. abc.png</param>
/// <returns></returns>
public bool UploadFile(IFormFile file, string containerName, string directoryPath, string fileName)
{
bool result = false;
try
{
//建立連線並指定容器
var containerClient = new BlobContainerClient(_connString, containerName);
//若容器不存在則建立新容器
containerClient.CreateIfNotExists();
//取得連線物件的實體
BlobClient blobClient = containerClient.GetBlobClient($"{directoryPath}/{fileName}");
using (var stream = new MemoryStream())
{
file.CopyTo(stream);
stream.Position = 0;
//上傳檔案
blobClient.Upload(stream, true);
}
result = true;
}
catch (Exception ex)
{
string message = ex.Message;
result = false;
}
return result;
}
/// <summary>
/// 從Azure Blob上刪除檔案
/// </summary>
/// <param name="containerName">容器名稱</param>
/// <param name="directoryPath">容器內的目錄 e.g. Images/User01</param>
/// <param name="fileName">檔名 e.g. abc.png</param>
/// <returns></returns>
public bool DeleteFile(string containerName, string directoryPath, string fileName)
{
bool result = false;
try
{
//建立連線並指定容器
var containerClient = new BlobContainerClient(_connString, containerName);
//取得連線物件的實體
BlobClient blobClient = containerClient.GetBlobClient($"{directoryPath}/{fileName}");
//若檔案存在就刪除
blobClient.DeleteIfExists();
result = true;
}
catch (Exception ex)
{
string message = ex.Message;
result = false;
}
return result;
}
/// <summary>
/// 取得檔案並以MemoryStream型別回傳
/// </summary>
/// <param name="containerName">容器名稱</param>
/// <param name="directoryPath">容器內的目錄 e.g. Images/User01</param>
/// <param name="fileName">檔名 e.g. abc.png</param>
/// <returns></returns>
public MemoryStream GetMemoryStreamOfFile(string containerName, string directoryPath, string fileName)
{
//建立連線並指定容器
var containerClient = new BlobContainerClient(_connString, containerName);
//取得連線物件的實體
BlobClient blobClient = containerClient.GetBlobClient($"{directoryPath}/{fileName}");
var stream = new MemoryStream();
blobClient.DownloadTo(stream);
return stream;
}
/// <summary>
/// 複製檔案
/// </summary>
/// <param name="sourceContainerName">來源容器名稱</param>
/// <param name="sourceDirectoryPath">來源容器內的目錄 e.g. Images/User01</param>
/// <param name="sourceFileName">來源檔名 e.g. abc.png</param>
/// <param name="descContainerName">目的地容器名稱</param>
/// <param name="descDirectoryPath">目的地容器內的目錄 e.g. NewImages/NewUser01</param>
/// <param name="descFileName">目的地來源檔名 e.g. new_abc.png</param>
/// <returns></returns>
public bool CopyFile(string sourceContainerName, string sourceDirectoryPath, string sourceFileName, string descContainerName, string descDirectoryPath, string descFileName)
{
bool result;
try
{
// Create a BlobServiceClient object which will be used to create a container client
BlobServiceClient blobServiceClient = new BlobServiceClient(_connString);
var sourceContainerClient = blobServiceClient.GetBlobContainerClient(sourceContainerName);
//取得連線物件的實體(要複製的來源)
BlobClient sourceBlobClient = sourceContainerClient.GetBlobClient($"{sourceDirectoryPath}/{sourceFileName}");
if (sourceBlobClient.Exists())
{
var descContainerClient = blobServiceClient.GetBlobContainerClient(descContainerName);
descContainerClient.CreateIfNotExists();
BlobClient descBlobClient = descContainerClient.GetBlobClient($"{descDirectoryPath}/{descFileName}");
descBlobClient.StartCopyFromUri(sourceBlobClient.Uri);
}
result = true;
}
catch (Exception ex)
{
string message = ex.Message;
result = false;
}
return result;
}
}
}
上傳 Controller 部分
public IActionResult Index()
{
return View();
}
/// <summary>單檔上傳</summary>
[HttpPost]
//把IIS上限改為200MB
[RequestFormLimits(MultipartBodyLengthLimit = 209715200)]
//把Kestrel Server上限改為200MB
[RequestSizeLimit(209715200)]
public IActionResult Index(IFormFile file)
{
if (file != null)
{
var blobService = new BlobService();
blobService.UploadFile(file, "allentest", "MyFiles/User_Allen", file.FileName);
}
return View();
}
/// <summary>多檔上傳</summary>
[HttpPost("MutiFile")]
//把IIS上限改為200MB
[RequestFormLimits(MultipartBodyLengthLimit = 209715200)]
//把Kestrel Server上限改為200MB
[RequestSizeLimit(209715200)]
public IActionResult MutiFile(List<IFormFile> files)
{
if (files != null && files?.Any() == true)
{
foreach (var file in files)
{
var blobService = new BlobService();
blobService.UploadFile(file, "allentest", "MyFiles/User_Allen", file.FileName);
}
}
return View();
}
上傳View部分
<!--單檔上傳-->
<form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="Index">
<input type="file" name="file" />
<br />
<input type="submit" value="單檔送出" />
</form>
<!--多檔上傳-->
<form method="post" enctype="multipart/form-data" asp-controller="Home" asp-action="MutiFile">
<input type="file" name="files" multiple />
<br />
<input type="submit" value="多檔送出" />
</form>下載Controller 部分
public IActionResult Download()
{
var blobService = new BlobService();
var stream = blobService.GetMemoryStreamOfFile("allentest", "MyFiles/User_Allen", "abc.png");
var fileBytes = stream.ToArray();
return File(fileBytes, "image/png", "download.png");
}刪除Controller 部分
public IActionResult Delete()
{
var blobService = new BlobService();
blobService.DeleteFile("allentest", "MyFiles/User_Allen", "abc.png");
return View();
}複製Controller 部分
public IActionResult Copy()
{
var blobService = new BlobService();
var stream = blobService.CopyFile("allentest", "MyFiles/User_Allen", "abc.png", "allentest", "MyFiles/User_Allen", "NewAbc.png");
return View();
}