C# 获取上载的s3对象.net的url

因此，目前我的代码将图像上传到S3，但我希望它现在要做的是获取已上传图像的URL，以便该URL可以存储在DB中，稍后使用

我知道这是可能的，正如这里的问题所示：（但那是JavaScript，我正在努力将其转换为c）

这是我的代码，它工作得很好，我只需要获得上传对象的URL+是否有一种方法可以在默认情况下公开该对象。我试着写回应，但没有帮助

public class AmazonS3Uploader
{

    private string bucketName = "cartalkio-image-storage-dev";
    private string keyName = DateTime.Now.ToString() + ".png";


    public async void UploadFile()
    {
        byte[] bytes = System.Convert.FromBase64String("iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==");

        Stream stream = new MemoryStream(bytes);

        var myAwsAccesskey = "*************";
        var myAwsSecret = "**************************";

        var client = new AmazonS3Client(myAwsAccesskey, myAwsSecret, Amazon.RegionEndpoint.EUWest2);

        try
        {
            PutObjectRequest putRequest = new PutObjectRequest
            {
                BucketName = bucketName,
                Key = keyName,
                ContentType = "image/png",
                InputStream = stream
            };

            PutObjectResponse response = await client.PutObjectAsync(putRequest);

        // Console.Write(response);
        }
        catch (AmazonS3Exception amazonS3Exception)
        {
            if (amazonS3Exception.ErrorCode != null &&
                (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId")
                ||
                amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
            {
                throw new Exception("Check the provided AWS Credentials.");
            }
            else
            {
                throw new Exception("Error occurred: " + amazonS3Exception.Message);
            }
        }
    }

---

我搜索了文档和各种网站，但我只找到了这些（）-我想没有返回URL。我所做的只是稍微修改了一下我的代码，因为你总是可以根据你上传的对象的名称来预测对象的URL。i、 e如果您正在上载名为“test.png”的图像，则URL将如下所示：

我尝试了依赖注入，但AWS不喜欢这样，因此我将代码更改为： （在本例中，我接收一个base64字符串，将其转换为一个字节，然后转换为SYSTEM.IO.Stream）

这是我发出的请求：

{ "image":"iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="
    }

控制器：

    public async Task<ActionResult> Index(string image)
    {
        AmazonS3Uploader amazonS3 = new AmazonS3Uploader();

        // This bit creates a random string that will be used as part of the URL
        var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        var stringChars = new char[8];
        var random = new Random();

        for (int i = 0; i < stringChars.Length; i++)
        {
            stringChars[i] = chars[random.Next(chars.Length)];
        }

        var finalString = new String(stringChars);

        // This bit adds the '.png' as its an image
        var keyName = finalString + ".png";

        // This uploads the file to S3, passing through the keyname (which is the end of the URL) and the image string
        amazonS3.UploadFile(keyName, image);

        // This is what the final URL of the object will be, so you can use this variable later or save it in your database
        var itemUrl = "https://[your-bucket-name].s3.[S3-Region].amazonaws.com/" + keyName;

        return Ok();
    }

---

唯一的问题是，如果文件上传到S3失败，您可能仍然会得到URL，如果您正在将其保存到数据库中，您将把URL保存到数据库中，但对象不会存在于S3 bucket中，因此它不会出现在任何地方。如果您实现了依赖项注入-这不应该是一个问题（本例中未实现依赖项注入）

如果字符串具有特殊字符，请不要忘记对其进行URL编码。事实上，我发现在“s3”之后有一个“-”（而不是“.”。所以

…s3-[s3区域]…

或

$“https://{bucketName}.s3-{RegionEndpoint.USWest2.SystemName}.amazonaws.com/{HttpUtility.UrlEncode（key）}”

    private string bucketName = "your-bucket-name";

    public async void UploadFile(string keyName, string image)
    {
        byte[] bytes = System.Convert.FromBase64String(image);

        Stream stream = new MemoryStream(bytes);

        var myAwsAccesskey = "*************";
        var myAwsSecret = "**************************";

        var client = new AmazonS3Client(myAwsAccesskey, myAwsSecret, Amazon.RegionEndpoint.[S3-Region]);

        try
        {
            PutObjectRequest putRequest = new PutObjectRequest
            {
                BucketName = bucketName,
                Key = keyName,
                ContentType = "image/png",
                InputStream = stream
            };

            PutObjectResponse response = await client.PutObjectAsync(putRequest);

        }
        catch (AmazonS3Exception amazonS3Exception)
        {
            if (amazonS3Exception.ErrorCode != null &&
                (amazonS3Exception.ErrorCode.Equals("InvalidAccessKeyId")
                ||
                amazonS3Exception.ErrorCode.Equals("InvalidSecurity")))
            {
                throw new Exception("Check the provided AWS Credentials.");
            }
            else
            {
                throw new Exception("Error occurred: " + amazonS3Exception.Message);
            }
        }
    }