.Net Core Web Api 上传女朋友的照片到微软云Azure Storage

前言

实现一个Web Api，把女朋友照片保存到Azure云的storage里。

Image Upload Api

在对应的Api Controller里，加上attribute：

[Consumes("application/json", "multipart/form-data")]

然后定义一个model，用来接收上传的图片：

/// <summary>
/// Image model
/// </summary>
public class UploadImage
{
    /// <summary>
    /// imageFile
    /// </summary>
    public IFormFile imageFile { get; set; }
}

实现对应的Api，处理客户端上传图片的请求：

/// <summary>
/// UploadImage
/// </summary>
/// <param name="imageData"></param>
/// <returns></returns>
[HttpPost]
[Route("imageupload")]
public async Task<IActionResult> UploadImage([FromForm]UploadImage imageData)
{
    var stream = imageData.imageFile.OpenReadStream();
    var name = imageData.imageFile.FileName;
    var uploadResult = await UploadFileAsBlob(stream, name);
    return Ok(name);
}

创建Storage

在Azure云服务创建相应的Storage，并在对应的Storage下建一个Blob，最后在Blob里创建一个Container，在storage的Access keys里，保存connection string，这个是服务端连接storage的credential key。
因为现在的云服务都是图形化操作，这里不再详述，在Portal都有对应的操作。

保存图片在Blob中

引用两个namespace：

using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Blob;

连接Azure storage：

/// <summary>
/// Save image to Azure blob
/// </summary>
/// <param name="stream"></param>
/// <param name="filename"></param>
/// <returns></returns>
public async Task<string> UploadFileAsBlob(Stream stream, string filename)
{
    CloudStorageAccount storageAccount = CloudStorageAccount.Parse("StorageAccountConnectionString");

    // Create the blob client.
    CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
     // Retrieve a reference to a container.
    CloudBlobContainer container = blobClient.GetContainerReference("BlobContainerName");
    CloudBlockBlob blockBlob = container.GetBlockBlobReference(filename);
    await blockBlob.UploadFromStreamAsync(stream);
    stream.Dispose();
    return blockBlob?.Uri.ToString();
 }