/// <summary>
/// Sets ETag.Value
/// </summary>
/// <param name="Entity"></param>
protected virtual string CalculateETag()
{
bool isHash;
object metaData = this.GetMetaData(out isHash);
string etag;
if (metaData is Guid)
{
etag = ((Guid)metaData).ToString("N");
}
else if (metaData is string)
{
if (isHash)
{
etag = (string)metaData;
}
else
{
etag = ETag.ComputeHash((string)metaData);
}
}
else if (metaData is byte[])
{
if (isHash)
{
etag = ETag.FormatBytes((byte[])metaData);
}
else
{
etag = ETag.ComputeHash((byte[])metaData);
}
}
else if (metaData is Stream)
{
etag = ETag.ComputeHash((Stream)metaData);
}
else
{
throw new NotSupportedException("GetMetaData must return Guid, String, Byte[], or Stream");
}
return("\"" + etag + "\"");
}