cegonsoft profile | learn String Type in C# .net

[bodakash]

One of the best examples of how class members can replace built-in functions is found with strings. In the past, every language has defined its own specialized functions for string manipulation.

In .NET, however, you use the methods of the String class, which ensures consistency between all .NET languages.

The following code snippet shows several ways to manipulate a string using its object nature:


string myString = "This is a test string ";
myString = myString.Trim(); // = "This is a test string"
myString = myString.Substring(0, 4); // = "This"
myString = myString.ToUpper(); // = "THIS"
myString = myString.Replace("IS", "AT"); // = "THAT"
int length = myString.Length; // = 4

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[seamustaylor]

The biggest issue with boxing is the fact that you are not actually accessing the original object so any changes that you make to the boxed object will not impact the original object. This causes some difficulties if you're not aware of it. For example:

Code Snippet

void Add ( object value1, object value2 )
{
int num1 = (int)value1;
int num2 = (int)value2;

num1 += num2;

value1 = num1;
}



Ignoring the fact that you'd never write code like this it also won't work properly. Because of boxing any int you pass to the method will be wrapped in an object instance. After the method is complete the object instance goes away. The original value type is never modified.
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[chicomarx]

Boxing and Unboxing in .NET

Boxing and Unboxing in .NET is used to convert a value type to an object and vice versa. In some cases or programs, values are to be stored in an object and retrieved. In the following program List1 is collection of objects. In that both strings and integers are stored by boxing implicitly. While calculating the sum of integers, unboxing is done explicitly as shown below.
List<object> List1 = new List<object>();

// BOXING //
// Add a string element to the list.
List1.Add("First Group:");

// Add some integers to the list.
for (int i = 1; i < 5; i++)
{
List1.Add(i);
}

// Add another string and more integers.
List1.Add("Second Group:");
for (int i = 5; i < 10; i++)
{
List1.Add(i);
}

foreach (var item in List1)
{
Console.WriteLine(item);
}

// UNBOXING //
var sum = 0;
for (var i = 1; i < 5; i++)
{
sum += (int)List1[i] * (int)List1[i];
}

Console.WriteLine("Sum: " + sum);


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[gabrilla]

The parameter placeholder {0}, {1} etc in Console.Write is handled by the string formatting. The placeholder has to have the index of the parameter but can also include formatting information.

This is used in Console.WriteLine and also string.format hence its inclusion here.
Layout of the PlaceHolder
The three parts are

index, alignment : format

So {0:X} (x means Hexadecimal) or {0,10} meaning output in a width of 10. The alignment value specifies teh width and left or right alignment by using - (left aligned) or + (right aligned) numbers. 10 Means right aligned in a width of 10, -6 means left aligned in a width of 6. Alignment is ignored if the output exceeds the width.

This provides a large number of formatting examples.

List of Numeric Formats

C or C - For Currency. Uses the cultures currency symbol.
D or D - Integer types. Add a number for 0 padding eg D5.
E or e - Scientific notation.
F or f - Fixed Point.
G or g - Compact fixed-point/scientific notation.
N or n - Number. This can be enhanced by a NumberFormatInfo object.
P or p - Percentage.
R or r - Round-trip. Keeps exact digits when converted to string and back.
X or x - Hexadecimal. x - uses abcdef, X use ABCDEF.

Dates can also be specified either using Standard Format strings

O or o - YYYY-MM-dd:mm:ss:ffffffffzz
R or r - RFC1123 eg ddd, dd MMM yyyy HH:ss GMT
s - sortable . yyyy-MM-ddTHH:mm:ss
u - Universal Sort Date - yyyy-MM-dd HH:mm:ssZ

or Format specifiers. There are too many of those to list here - see example 6 for examples using them. I've commented the examples.

This concludes this tutorial. The next C# programming tutorial will be on Windows forms.

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[jyotis016]

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[biswanathan.g]

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[arjunpktr]

It's useful unboxing program..
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[mithunshalom]

The first one looks kind of variable is called a String. String variables are always text. We write a small program that takes the text in the text box to save the text into a variable and then displays the text in the message field.

But remember that a variable is simply a storage area to keep things you will need later. Think of them as boxes in a room. The boxes are empty until you put something in them.



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[madhusundar]

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ASP.NET is a Microsoft Technology
ASP stands for Active Server Pages
ASP.NET is a program that runs inside IIS
IIS (Internet Information Services) is Microsoft's Internet server
IIS comes as a free component with Windows servers
IIS is also a part of Windows 2000 and XP Professional


The .NET Framework is the infrastructure for the Microsoft .NET platform.

The .NET Framework is an environment for building, deploying, and running Web applications and Web Services.

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