.NET Framework-Detailed introduction to Array

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　Array is the most basic data collection provided by .NET, which directly accesses collection elements through indexes. Provides one-dimensional or multi-dimensional data storage and supports operations such as query, search, sorting, copying, etc. The main interfaces provided by
are divided according to semantics, mainly including:

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　One-dimensional arrayDeclaration, creation, initialization:
1) Directly in the initializer:

           int[] mp = new int[6] { -50, -30, -10, 10, 30, 50 };

2) Assign values ​​separately:

            mp[0] = -50;
            mp[1] = -30;
            mp[2] = -10;
            mp[3] = 10;
            mp[4] = 30;
            mp[5] = 50;

As shown in the figure below, the numbers of the one-dimensional graphs are 0,1,2,3,4,5 respectively

##Multidimensional (such as two-dimensional) array declaration, creation, initialization: (As shown in the figure above, the two-dimensional numbers are 0, 1, 2, 3, 4, 5 respectively)

            int[,] point = new int[2, 6] {
             { -50, -30, -10, 10, 30, 50 },//第0维
             { 50, 30, 10, 10, 30, 50 }//第1维 
                                         };

Initialization respectively:

            //点0
            point[0, 0] = -50;            point[1, 0] = 50;            //点1
            point[0, 1] = -30;            point[1, 1] = 30;            //点2
            point[0, 2] = -10;            point[1, 2] = 10;            //点3
            point[0, 3] = 10;            point[1, 3] = 10;            //点4
            point[0, 4] = 30;            point[1, 4] = 30;            //点5
            point[0, 5] = 50;            point[1, 5] = 50;

Comparison of one-dimensional and multi-dimensional, semantic differences of interface methods:

            //获取某维的元素个数
            int mpLen0 = mp.GetLength(0);//6
            int pointLen0 = point.GetLength(0);//2
            int pointLen1 = point.GetLength(1);//6

            //获取某个维度的下标最大值
            int mpUpperBound = mp.GetUpperBound(0); //5
            int pointUpperBound0 = point.GetUpperBound(0);//1
            int pointUpperBound1 = point.GetUpperBound(1);//5
            //获取某个维度的下标最小值
            int mpLowBound = mp.GetLowerBound(0);//0
            int pointLowBound0 = point.GetLowerBound(0);//0
            int pointLowBound1 = point.GetLowerBound(1);//0

            //获取所有维数的元素总数
            int mpLen = mp.Length;//6
            int pointLen = point.Length;//12
            //获取维数
            int mpRank = mp.Rank;//1
            int pointRank = point.Rank;//2

Summary 1 Array elements must be determined at compile time The number of elements in each dimension is its biggest flaw. For situations where the number of elements in a certain dimension can only be determined at runtime, this data structure cannot meet the conditions!
　2 The type of Array when it is created is a strong type and must be specified.
　

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