public async Task <ItemMeta> GetObjectMetadataAsync(string bucketName, string objectName, string versionID = null, string matchEtag = null, DateTime?modifiedSince = null)
{
if (string.IsNullOrEmpty(bucketName))
{
throw new ArgumentNullException(nameof(bucketName));
}
if (string.IsNullOrEmpty(objectName))
{
throw new ArgumentNullException(nameof(objectName));
}
bucketName = ConvertBucketName(bucketName);
HeadObjectRequest request = new HeadObjectRequest(bucketName, objectName);
if (!string.IsNullOrEmpty(versionID))
{
request.SetVersionId(versionID);
}
//执行请求
HeadObjectResult result = _client.HeadObject(request);
if (!result.IsSuccessful())
{
throw new Exception("Query object meta data failed.");
}
ItemMeta metaData = new ItemMeta()
{
ObjectName = objectName,
Size = result.size,
ETag = result.eTag,
IsEnableHttps = Options.IsEnableHttps,
};
return(await Task.FromResult(metaData));
}
public Task <bool> ObjectsExistsAsync(string bucketName, string objectName)
{
if (string.IsNullOrEmpty(bucketName))
{
throw new ArgumentNullException(nameof(bucketName));
}
objectName = FormatObjectName(objectName);
bucketName = ConvertBucketName(bucketName);
try
{
//build request
HeadObjectRequest request = new HeadObjectRequest(bucketName, objectName);
//执行请求
HeadObjectResult result = _client.HeadObject(request);
if (result.IsSuccessful())
{
return(Task.FromResult(true));
}
else
{
return(Task.FromResult(false));
}
}
catch (CosServerException ex)
{
if (ex.statusCode == 404)
{
return(Task.FromResult(false));
}
throw;
}
}
/// 获取对象信息
public void HeadObject()
{
//.cssg-snippet-body-start:[head-object]
try
{
string bucket = "examplebucket-1250000000"; //存储桶，格式：BucketName-APPID
string key = "exampleobject"; //对象键
HeadObjectRequest request = new HeadObjectRequest(bucket, key);
//执行请求
HeadObjectResult result = cosXml.HeadObject(request);
//请求成功
Console.WriteLine(result.GetResultInfo());
}
catch (COSXML.CosException.CosClientException clientEx)
{
//请求失败
Console.WriteLine("CosClientException: " + clientEx);
}
catch (COSXML.CosException.CosServerException serverEx)
{
//请求失败
Console.WriteLine("CosServerException: " + serverEx.GetInfo());
}
//.cssg-snippet-body-end
}