Question

我只使用Microsoft Azure存储而不使用其他Azure产品/服务。我通过ftp类型的客户端（GoodSync）将文件上传到我的存储blob，我需要在它们已经在Blob中之后根据文件扩展名更改所有文件的内容类型。我已经环顾四周，并没有找到如何做到这一点，没有他们的任何一个与PowerShell的VPS。我有什么选择，我该如何做到这一点？我真的需要一步一步来。

Answer 1

我最近遇到了同样的问题，所以我创建了一个简单的实用工具类，以便根据文件的扩展名“修复”内容类型。您可以阅读详细信息here

您需要做的是解析Azure存储容器中的每个文件，并根据定义哪种MIME类型适合每个文件扩展名的字典更新ContentType。

// Connect to your storage account
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(storageConnectionString);

// Load Container with the specified name 
private CloudBlobContainer GetCloudBlobContainer(string name)
{
    CloudBlobClient cloudBlobClient = _storageAccount.CreateCloudBlobClient();
    return cloudBlobClient.GetContainerReference(name.ToLowerInvariant());
}

// Parse all files in your container and apply proper ContentType
private void ResetContainer(CloudBlobContainer container)
{
    if (!container.Exists()) return;

    Trace.WriteLine($"Ready to parse {container.Name} container");
    Trace.WriteLine("------------------------------------------------");

    var blobs = container.ListBlobs().ToList();

    var total = blobs.Count;
    var counter = 1;

    foreach (var blob in blobs)
    {
        if (blob is CloudBlobDirectory) continue;

        var cloudBlob = (CloudBlob)blob;

        var extension = Path.GetExtension(cloudBlob.Uri.AbsoluteUri);

        string contentType;
        _contentTypes.TryGetValue(extension, out contentType);
        if (string.IsNullOrEmpty(contentType)) continue;

        Trace.Write($"{counter++} of {total} : {cloudBlob.Name}");
        if (cloudBlob.Properties.ContentType == contentType)
        {
            Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (skipped)");
            continue;
        }

        cloudBlob.Properties.ContentType = contentType;
        cloudBlob.SetProperties();
        Trace.WriteLine($" ({cloudBlob.Properties.ContentType}) (reset)");
    }
}

_contentTypes是一个字典，其中包含每个文件扩展名的相应MIME类型：

    private readonly Dictionary _contentTypes = new Dictionary()
    {
        {".jpeg", "image/jpeg"},
        {".jpg", "image/jpeg" }
    };

可以找到完整的内容类型和源代码列表here。

Answer 2

这是最新 Azure.Storage.Blobs SDK 的更新版本。我正在使用 .Net 5 和控制台应用程序。

using Azure.Storage.Blobs.Models;
using System;
using System.Collections.Generic;
using System.IO;

var contentTypes = new Dictionary<string, string>()
{
    {".woff", "font/woff"},
    {".woff2", "font/woff2" }
};

var cloudBlobClient = new BlobServiceClient("connectionstring");
var cloudBlobContainerClient = cloudBlobClient.GetBlobContainerClient("fonts");
await cloudBlobContainerClient.CreateIfNotExistsAsync();

var blobs = cloudBlobContainerClient.GetBlobsAsync();

await foreach (var blob in blobs)
{
    var extension = Path.GetExtension(blob.Name);

    contentTypes.TryGetValue(extension, out var contentType);
    if (string.IsNullOrEmpty(contentType)) continue;

    if (blob.Properties.ContentType == contentType)
    {
        continue;
    }

    try
    {
        // Get the existing properties
        var blobClient = cloudBlobContainerClient.GetBlobClient(blob.Name);
        var properties = await blobClient.GetPropertiesAsync();

        var headers = new BlobHttpHeaders { ContentType = contentType };

        // Set the blob's properties.
        await blobClient.SetHttpHeadersAsync(headers);
    }
    catch (RequestFailedException e)
    {
        Console.WriteLine($"HTTP error code {e.Status}: {e.ErrorCode}");
        Console.WriteLine(e.Message);
        Console.ReadLine();
    }
}

更改Azure存储Blob中文件的内容类型

2 个答案: