1. C# tutorial

  • 1.35. C # inheritance

    Inheritance is one of the most important concepts in object-oriented programming. Inheritance allows us to define one class ...
    2025-10-25 13:34:36 UTC
  • 1.36. C# polymorphism

    Polymorphism is the ability of the same behavior to have many different forms or forms of expression. Polymorphism means m...
    2025-10-25 13:34:34 UTC
  • 1.37. C # operator overload

    You can redefine or overload the operators built into C #. Therefore, programmers can also use operators of user-defined typ...
    2025-10-25 13:34:33 UTC
  • 1.38. C # interface

    Interface defines the syntax contract that all classes should follow when inheriting interfaces. The interface defines the “...
    2025-10-25 13:34:42 UTC
  • 1.39. C # namespace

    Namespaces are designed to provide a way to separate one set of names from others. The name of a class declared in one names...
    2025-10-25 13:34:32 UTC
  • 1.40. C# preprocessor instruction

    The preprocessor instruction instructs the compiler to preprocess the information before the actual compilation begins. Al...
    2025-10-25 13:34:40 UTC
  • 1.41. C # regular expression

    A regular expression is a pattern that matches input text. .Net framework provides a regular expression engine that al...
    2025-10-25 13:34:33 UTC
  • 1.42. C# exception handling

    Exceptions are problems that occur during program execution. An exception inC # is a response to a special situation that oc...
    2025-10-25 13:34:39 UTC
  • 1.43. C# file input and output

    A file is a collection of data stored on disk with a specified name and directory path. When a file is opened for reading an...
    2025-10-25 13:34:33 UTC
  • 1.44. C # text file reading and writing

    StreamReader and StreamWriter class is used for data reading and writing to text files. These classes are derived fr...
    2025-10-25 13:34:37 UTC
  • 1.45. C# binary file reading and writing

    BinaryReader and BinaryWriter class is used to read and write binary files. 1.45.1. BinaryReader class # ...
    2025-10-25 13:34:31 UTC
  • 1.46. C# operation of Windows file system

    C# allows you to manipulate directories and files using classes related to various directories and files, such as Director...
    2025-10-25 13:34:32 UTC
  • 1.47. C# attribute

    An Attribute is a declarative tag used to pass behavior information about various elements in a program, such as classes, me...
    2025-10-25 13:34:36 UTC
  • 1.48. C# reflection

    Reflection is the ability of a program to access, detect, and modify its ownstate or behavior. Assemblies contain modules,...
    2025-10-25 13:34:42 UTC
  • 1.49. C# property

    Properties are named members of classes, structures and interfaces. A member variable or method in a class or structure is c...
    2025-10-25 13:34:38 UTC
  • 1.50. C# indexer

    The Indexer allows an object to be accessed in the same way as an array using a subscript. When you define an indexer for ...
    2025-10-25 13:34:33 UTC
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。