c# - C# Firebird BLOB_SUB_TYPE_0 图像保存

Question

我在使用 C# 的 Firebird 数据库中有一个类似“BLOB_SUB_TYPE_0”的字段。如何导出图片？

C# 控制台.App

using (var conn = new FbConnection(connectionString))
        {
            conn.Open();
            using (var command = new FbCommand(sql, conn))
            {
                using (var reader = command.ExecuteReader()) {
                    var sb = new StringBuilder();
                    while (reader.Read()) {

                        string fileName = reader["DOSYAADI"].ToString();


                        byte[] blob = (byte[])reader["FILEDATA"];
                        // create a file FileStream to write the data
                        FileStream fs = new FileStream(@"D:\" +fileName, FileMode.Create);
                        fs.Write(blob, 0, blob.Length);
                        fs.Close();

                    }
                }
            }
        }