/// <summary> /// /// </summary> public object GetQuery(String query) { int hr; if (query == null) { throw new System.ArgumentNullException("query"); } EnsureBitmapMetadata(); PROPVARIANT propVar = new PROPVARIANT(); try { propVar.Init(null); lock (_syncObject) { hr = UnsafeNativeMethods.WICMetadataQueryReader.GetMetadataByName( _metadataHandle, query, ref propVar ); } if (hr != (int)WinCodecErrors.WINCODEC_ERR_PROPERTYNOTFOUND) { HRESULT.Check(hr); object objValue = propVar.ToObject(_syncObject); if (IsFrozenInternal) { BitmapMetadata metadata = objValue as BitmapMetadata; if (metadata != null) { metadata.Freeze(); } } return(objValue); } } finally { propVar.Clear(); } return(null); }