barcode printing using c#.net The C# Language in Visual C#

Drawer QR in Visual C# The C# Language

The C# Language
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// Demonstrate the index-range array class RangeArrayDemo { static void Main() { RangeArray ra = new RangeArray(-5, 5); RangeArray ra2 = new RangeArray(1, 10); RangeArray ra3 = new RangeArray(-20, -12); // Demonstrate ra ConsoleWriteLine("Length of ra: " + raLength); for(int i = -5; i <= 5; i++) ra[i] = i; ConsoleWrite("Contents of ra: "); for(int i = -5; i <= 5; i++) ConsoleWrite(ra[i] + " "); ConsoleWriteLine("\n"); // Demonstrate ra2 ConsoleWriteLine("Length of ra2: " + ra2Length); for(int i = 1; i <= 10; i++) ra2[i] = i; ConsoleWrite("Contents of ra2: "); for(int i = 1; i <= 10; i++) ConsoleWrite(ra2[i] + " "); ConsoleWriteLine("\n"); // Demonstrate ra3 ConsoleWriteLine("Length of ra3: " + ra3Length); for(int i = -20; i <= -12; i++) ra3[i] = i; ConsoleWrite("Contents of ra3: "); for(int i = -20; i <= -12; i++) ConsoleWrite(ra3[i] + " "); ConsoleWriteLine("\n"); } }
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The output from the program is shown here:
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Length of ra: 11 Contents of ra: -5 -4 -3 -2 -1 0 1 2 3 4 5 Length of ra2: 10 Contents of ra2: 1 2 3 4 5 6 7 8 9 10 Length of ra3: 9 Contents of ra3: -20 -19 -18 -17 -16 -15 -14 -13 -12
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10:
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Indexers and Properties
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As the output verifies, objects of type RangeArray can be indexed in ways other than starting at zero Let s look more closely at how RangeArray is implemented RangeArray begins by defining the following private instance variables:
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// Private data int[] a; // reference to underlying array int lowerBound; // smallest index int upperBound; // largest index
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PART I PART I PART I
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The underlying array is referred to by a This array is allocated by the RangeArray constructor The index of the lower bound of the array is stored in lowerBound, and the index of the upper bound is stored in upperBound Next, the auto-implemented, read-only properties Length and Error are declared:
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// An auto-implemented, read-only Length property public int Length { get; private set; } // An auto-implemented, read-only Error property public bool Error { get; private set; }
Notice that for both properties, the set accessor is private As explained earlier in this chapter, this results in what is effectively a read-only, auto-implemented property The RangeArray constructor is shown here:
// Construct array given its size public RangeArray(int low, int high) { high++; if(high <= low) { ConsoleWriteLine("Invalid Indices"); high = 1; // create a minimal array for safety low = 0; } a = new int[high - low]; Length = high - low; lowerBound = low; upperBound = --high; }
A RangeArray is constructed by passing the lower bound index in low and the upper bound index in high The value of high is then incremented because the indexes specified are inclusive Next, a check is made to ensure that the upper index is greater than the lower index If not, an error is reported and a one-element array is created Next, storage for the array is allocated and assigned to a Then the Length property is set equal to the number of elements in the array Finally, lowerBound and upperBound are set Next, RangeArray implements its indexer, as shown here:
// This is the indexer for RangeArray public int this[int index] { // This is the get accessor get { if(ok(index)) {
Part I:
The C# Language
Error = false; return a[index - lowerBound]; } else { Error = true; return 0; } } // This is the set accessor set { if(ok(index)) { a[index - lowerBound] = value; Error = false; } else Error = true; } }
This indexer is similar to the one used by FailSoftArray, with one important exception Notice the expression that indexes a It is
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