我只想从某个(Blob)表中选择几列。我有以下字段:Id、RowVersion、Size、Signature、Blob，我只想选择前四个。我这样做:(--->是一个错误的地方)publicListGetAllBlobsNames(){RichTekstModelDataContextdc=newRichTekstModelDataContext();varallBlobs=frombindc.Blobsorderbyb.RowVersiondescendingselectnew{b.Id,b.Size,b.Signature,b.RowVersion};--->allBlobs.ToL