/// <summary>
/// 获取图片附件的宽度和高度
/// </summary>
private void CheckImageInfo(Stream stream)
{
if (MediaType == MediaType.Image)
{
string contentType;
int width;
int height;
if (ImageMetadata.Check(stream, out contentType, out width, out height))
{
this.ContentType = contentType;
this.Width = width;
this.Height = height;
}
}
}