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AccessCondition.IfMatch-Methode

Returns an access condition such that an operation will be performed only if the resource's ETag value matches the ETag value provided.

Namespace: Microsoft.WindowsAzure.StorageClient
Assembly: Microsoft.WindowsAzure.StorageClient (in microsoft.windowsazure.storageclient.dll)

'Usage
Dim etag As String
Dim returnValue As AccessCondition

returnValue = AccessCondition.IfMatch(etag)

public static AccessCondition IfMatch (
	string etag
)
public static AccessCondition IfMatch (
	String etag
)
public static function IfMatch (
	etag : String
) : AccessCondition

Parameter

etag

The ETag value to check.

Rückgabewert

A structure specifying the If-Match condition.

The following example deletes a blob if its ETag matches a specified value.

static void DeleteIfMatch(Uri blobEndpoint, string accountName, string accountKey, string eTag)
{
    CloudBlobClient blobClient = new CloudBlobClient(blobEndpoint, new StorageCredentialsAccountAndKey(accountName, accountKey));

    //Get a reference to the blob.
    CloudBlob blob = blobClient.GetBlobReference("mycontainer/myblob.txt");

    //Indicate that any snapshots should be deleted.
    BlobRequestOptions options = new BlobRequestOptions();
    options.DeleteSnapshotsOption = DeleteSnapshotsOption.IncludeSnapshots;

    //Specify the if-match condition. The blob will be deleted if its ETag matches the value passed in.
    options.AccessCondition = AccessCondition.IfMatch(eTag);

    //Delete the blob if the condition is met.
    blob.Delete(options);
}


Setting this access condition modifies the request to include the HTTP If-Match conditional header.

If this access condition is set, the operation is performed only if the ETag of the resource matches the specified ETag.

See Specifying Conditional Headers for Blob Service Operations for more information.


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Entwicklungsplattformen

Windows XP Home Edition, Windows XP Professional, Windows Server 2003, Windows Server 2008 und Windows 2000

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