1. C# tutorial

  • 1.51. C# delegation

    A Delegate in C# is similar to a pointer to a function in C or C++. A Delegate is a reference type variable that holds a ref...
    2025-10-25 13:34:39 UTC
  • 1.52. C# event

    An Event is basically a user action, such as keystrokes, clicks, mouse movements, etc., or prompts, such as system-generated...
    2025-10-25 13:34:41 UTC
  • 1.53. C# collection

    The Collection class is a class dedicated to data storage and retrieval. These classes provide support for stack, queue, lis...
    2025-10-25 13:34:34 UTC
  • 1.54. C# dynamic arrayList

    A dynamic arrayList represents an ordered collection of objects thatcan be indexed separately. It can basically replace an a...
    2025-10-25 13:34:32 UTC
  • 1.55. C# hashtable

    The Hashtable class represents a series of key/value pairs organized by key-based hash code. It uses keys to access elements...
    2025-10-25 13:34:40 UTC
  • 1.56. C# sortedlist

    The SortedList class represents a series of key/value pairs sorted by key,which can be accessed by key and index. A sorted...
    2025-10-25 13:34:31 UTC
  • 1.57. C# Stack

    The Stack represents a collection of last-in, first-out objects. Use the stack when you need last-in-first-out access to ite...
    2025-10-25 13:34:31 UTC
  • 1.58. C# queue

    A queue represents a collection of first-in, first-out objects. Queues are used when you need first-in, first-out access to ...
    2025-10-25 13:34:41 UTC
  • 1.59. C# BitArray

    BitArray class manages a compact array of bit values, represented by Boolean values, where true indicates that the b...
    2025-10-25 13:34:35 UTC
  • 1.60. C# generics

    Generic allows you to delay writing specifications for the data types of programming elements in a class or method until it ...
    2025-10-25 13:34:37 UTC
  • 1.61. C# anonymous method

    We have already mentioned that delegates are used to reference methods that have the same label as them. In other words, you...
    2025-10-25 13:34:35 UTC
  • 1.62. C# unsafe code

    When a code block is marked with the unsafe modifier,C# allows the use of pointer variables in functions.Unsafe or unman...
    2025-10-25 13:34:31 UTC
  • 1.63. C# multithreading

    A thread is defined as the execution path of the program. Each thread defines a unique control flow. If your application inv...
    2025-10-25 13:34:35 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。