主题：[求助]请教阿里云OSS使用签名URL进行临时授权

    // 生成上传签名URL。
    var generatePresignedUriRequest = new GeneratePresignedUriRequest(bucketName, objectName, SignHttpMethod.Put)
    {
        Expiration = DateTime.Now.AddHours(1),
    };
    var signedUrl = client.GeneratePresignedUri(generatePresignedUriRequest);

using Aliyun.OSS;
using Aliyun.OSS.Common;
var endpoint = "<yourEndpoint>";
var accessKeyId = "<yourAccessKeyId>";
var accessKeySecret = "<yourAccessKeySecret>";
var bucketName = "<yourBucketName>";
var objectName = "<yourObjectName>";
var objectContent = "More than just cloud.";
// 创建OSSClient实例。
var client = new OssClient(endpoint, accessKeyId, accessKeySecret);
try
{
    // 生成上传签名URL。
    var generatePresignedUriRequest = new GeneratePresignedUriRequest(bucketName, objectName, SignHttpMethod.Put)
    {
        Expiration = DateTime.Now.AddHours(1),
    };
    var signedUrl = client.GeneratePresignedUri(generatePresignedUriRequest);
    // 使用签名URL上传文件。
    var buffer = Encoding.UTF8.GetBytes(objectContent);
    using (var ms = new MemoryStream(buffer))
    {
        client.PutObject(signedUrl, ms);
    }
    Console.WriteLine("Put object by signatrue succeeded. {0} ", signedUrl.ToString());
}
catch (OssException ex)
{
    Console.WriteLine("Failed with error code: {0}; Error info: {1}. \nRequestID:{2}\tHostID:{3}",
        ex.ErrorCode, ex.Message, ex.RequestId, ex.HostId);
}
catch (Exception ex)
{
    Console.WriteLine("Failed with error info: {0}", ex.Message);
}

    // 生成上传签名URL。
    var generatePresignedUriRequest = new GeneratePresignedUriRequest(bucketName, objectName, SignHttpMethod.Put)
    {
        Expiration = DateTime.Now.AddHours(1),
    };
    var signedUrl = client.GeneratePresignedUri(generatePresignedUriRequest);