barcode generator c# source code Multidimensional Indexers in C#

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Multidimensional Indexers
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You can create indexers for multidimensional arrays, too For example, here is a twodimensional fail-soft array Pay close attention to the way that the indexer is declared
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// A two-dimensional fail-soft array using System; class FailSoftArray2D { int[,] a; // reference to underlying 2D array int rows, cols; // dimensions public int Length; // Length is public public bool ErrFlag; // indicates outcome of last operation // Construct array given its dimensions public FailSoftArray2D(int r, int c) {
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Indexers and Properties
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rows = r; cols = c; a = new int[rows, cols]; Length = rows * cols; } // This is the indexer for FailSoftArray2D public int this[int index1, int index2] { // This is the get accessor get { if(ok(index1, index2)) { ErrFlag = false; return a[index1, index2]; } else { ErrFlag = true; return 0; } } // This is the set accessor set { if(ok(index1, index2)) { a[index1, index2] = value; ErrFlag = false; } else ErrFlag = true; } } // Return true if indexes are within bounds private bool ok(int index1, int index2) { if(index1 >= 0 & index1 < rows & index2 >= 0 & index2 < cols) return true; return false; } } // Demonstrate a 2D indexer class TwoDIndexerDemo { static void Main() { FailSoftArray2D fs = new FailSoftArray2D(3, 5); int x; // Show quiet failures ConsoleWriteLine("Fail quietly"); for(int i=0; i < 6; i++) fs[i, i] = i*10; for(int i=0; i < 6; i++) { x = fs[i,i]; if(x != -1) ConsoleWrite(x + " "); }
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PART I PART I PART I
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The C# Language
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ConsoleWriteLine(); // Now, display failures ConsoleWriteLine("\nFail with error reports"); for(int i=0; i < 6; i++) { fs[i,i] = i*10; if(fsErrFlag) ConsoleWriteLine("fs[" + i + ", " + i + "] out-of-bounds"); } for(int i=0; i < 6; i++) { x = fs[i,i]; if(!fsErrFlag) ConsoleWrite(x + " "); else ConsoleWriteLine("fs[" + i + ", " + i + "] out-of-bounds"); } } }
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The output from this program is shown here:
Fail quietly 0 10 20 0 0 0 Fail with error reports fs[3, 3] out-of-bounds fs[4, 4] out-of-bounds fs[5, 5] out-of-bounds 0 10 20 fs[3, 3] out-of-bounds fs[4, 4] out-of-bounds fs[5, 5] out-of-bounds
Properties
Another type of class member is the property As a general rule, a property combines a field with the methods that access it As some examples earlier in this book have shown, you will often want to create a field that is available to users of an object, but you want to maintain control over the operations allowed on that field For instance, you might want to limit the range of values that can be assigned to that field While it is possible to accomplish this goal through the use of a private variable along with methods to access its value, a property offers a better, more streamlined approach Properties are similar to indexers A property consists of a name along with get and set accessors The accessors are used to get and set the value of a variable The key benefit of a property is that its name can be used in expressions and assignments like a normal variable, but in actuality the get and set accessors are automatically invoked This is similar to the way that an indexer s get and set accessors are automatically used The general form of a property is shown here: type name { get { // get accessor code }
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Indexers and Properties
set { // set accessor code } } Here, type specifies the type of the property, such as int, and name is the name of the property Once the property has been defined, any use of name results in a call to its appropriate accessor The set accessor automatically receives a parameter called value that contains the value being assigned to the property It is important to understand that properties do not define storage locations Instead, a property typically manages access to a field It does not, itself, provide that field The field must be specified independently of the property (The exception is the auto-implemented property added by C# 30, which is described shortly) Here is a simple example that defines a property called MyProp, which is used to access the field prop In this case, the property allows only positive values to be assigned
// A simple property example using System; class SimpProp { int prop; // field being managed by MyProp public SimpProp() { prop = 0; } /* This is the property the private instance allows only positive public int MyProp { get { return prop; } set { if(value >= 0) prop } } } // Demonstrate a property class PropertyDemo { static void Main() { SimpProp ob = new SimpProp(); ConsoleWriteLine("Original value of obMyProp: " + obMyProp); obMyProp = 100; // assign value ConsoleWriteLine("Value of obMyProp: " + obMyProp); // Can't assign negative value to prop ConsoleWriteLine("Attempting to assign -10 to obMyProp"); obMyProp = -10; ConsoleWriteLine("Value of obMyProp: " + obMyProp); } } that supports access to variable prop It values */
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