Array Basics in .NET Maker Code128 in .NET Array Basics

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Array Basics using barcode writer for visual .net control to generate, create code 128 image in visual .net applications. GS1 DataBar Family objects in Code 128 Code Set C for .NET the ArrayList, one at a time. The following code fragment demonstrates how to use a For Each loop with an ArrayList:.

int total = 0; double average = 0.0; foreach (Object grade in grades) total += (int)grade; average = total / grades.Count; Console.

WriteLine("The average grade is: " + average);. If you wan Visual Studio .NET barcode code 128 t to add an element to an ArrayList at a particular position, you can use the Insert method. This method takes two arguments: the index to insert the element, and the element to be inserted.

The following code fragment inserts two grades in speci c positions in order to preserve the order of the objects in the ArrayList:. grades.Ins ert(1, 99); grades.Insert(3, 80);.

You can ch barcode code 128 for .NET eck the current capacity of an ArrayList by calling the Capacity property and you can determine how many elements are in an ArrayList by calling the Count property:. Console.Wr iteLine("The current capacity of grades is: " + grades.Capacity); Console.

WriteLine("The number of grades in grades is: " + grades.Count);. There are VS .NET barcode code 128 several ways to remove items from an ArrayList. If you know the item you want to remove, but don t know what position it is in, you can use the Remove method.

This method takes just one argument an object to remove from the ArrayList. If the object exists in the ArrayList, it is removed. If the object isn t in the ArrayList, nothing happens.

When a method like Remove is used, it is typically called inside an If Then statement using a method that can verify the object is actually in the ArrayList, such as the Contains method. Here s a sample code fragment:. if (grades .Contains(54)) grades.Remove(54) else Console.

Write("Object not in ArrayList.");. ARRAYS AND ARRAYLISTS If you kno w the index of the object you want to remove, you can use the RemoveAt method. This method takes one argument the index of the object you want to remove. The only exception you can cause is passing an invalid index to the method.

The method works like this:. grades.RemoveAt(2);. You can de termine the position of an object in an ArrayList by calling the IndexOf method. This method takes one argument, an object, and returns the object s position in the ArrayList. If the object is not in the ArrayList, the method returns -1.

Here s a short code fragment that uses the IndexOf method in conjunction with the RemoveAt method:. int pos; p code-128c for .NET os = grades.IndexOf(70); grades.

RemoveAt(pos);. In additio n to adding individual objects to an ArrayList, you can also add ranges of objects. The objects must be stored in a data type that is derived from ICollection. This means that the objects can be stored in an array, a Collection, or even in another ArrayList.

There are two different methods you can use to add a range to an ArrayList. These methods are AddRange and InsertRange. The AddRange method adds the range of objects to the end of the ArrayList, and the InsertRange method adds the range at a speci ed position in the ArrayList.

The following program demonstrates how these two methods are used:. using Syst Code 128 Code Set A for .NET em; using System.Collections; class class1 { static void Main() { ArrayList names = new ArrayList(); names.

Add("Mike"); names.Add("Beata"); names.Add("Raymond"); names.

Add("Bernica"); names.Add("Jennifer"); Console.WriteLine("The original list of names: ");.

Array Basics foreach (O code 128 barcode for .NET bject name in names) Console.WriteLine(name); Console.

WriteLine(); string[] newNames = new string[] {"David", "Michael"}; ArrayList moreNames = new ArrayList(); moreNames.Add("Terrill"); moreNames.Add("Donnie"); moreNames.

Add("Mayo"); moreNames.Add("Clayton"); moreNames.Add("Alisa"); names.

InsertRange(0, newNames); names.AddRange(moreNames); Console.WriteLine("The new list of names: "); foreach (Object name in names) Console.

WriteLine(name); } }. The output from this program is:. David Michael Mike Bernica Beata Raymond Jennifer Terrill Donnie Mayo Clayton Alisa The rst t wo names are added at the beginning of the ArrayList because the speci ed index is 0. The last names are added at the end because the AddRange method is used. Two other methods that many programmers nd useful are the ToArray method and the GetRange method.

The GetRange method returns a range of objects from the ArrayList as another ArrayList. The ToArray method copies.
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