Topic 4

Lesson 4. Basic .Net libraries. Indexers and properties. Exception handling. Data Input-Output.

Objective: formation of a holistic system of knowledge among students about data encapsulation mechanisms, program fault tolerance, and interaction with external media in the .NET environment. The student must master the principles of properties as intelligent wrappers over closed fields, understand the role of get and set accessors and the implicit value parameter in providing control over data, and also distinguish properties from indexers that provide index access to class instances. During the training, special attention is paid to mastering the exception handling architecture: from understanding the hierarchy of System.Exception classes to the practical application of try-catch-finally blocks for isolating potentially dangerous code and correct resource cleanup. Students must learn to design reliable applications that are able to overcome exceptional situations without loss of performance. In addition, the teaching involves the formation of skills in working with input-output streams (Stream), where the student must differentiate byte (FileStream), character (StreamReader, StreamWriter) and binary (BinaryReader, BinaryWriter) streams depending on the data format and processing tasks. An important aspect is mastering methods of random access to files using Seek and techniques for redirecting standard console streams to physical files. As a result of studying the material, the student must be able to analyze the structure of complex objects to select optimal class members, effectively handle errors at different levels of nesting and implement effective application interaction with the file system.