Net4.0---framwork new features

1 BigInteger

BigInteger is a new class in the Net4.0 System.numerics namespace that represents a signed integer of any size. These all have minvalue and MaxValue attributes, such as the Int32,int64 in previous versions, which means that there is a size limit, and BigInteger no size limit, So in theory, when large numbers are large enough, outofmemoryexception anomalies may occur.

As an example of BigInteger, the following example is a function that computes the Fibonacci:

public static int Fibonacci (int x)
{
    var prevalue =-1;
    var curvalue = 1;
    for (int i = 0; I <= x; ++i)
    {
        var sum = prevalue + curvalue;
        Prevalue = Curvalue;
        Curvalue = sum;
    }
    return curvalue;
}

The above code overflows when the value of X is 47, and the result is the following figure:

Now modify the code and use the BigInteger code as follows:

public static BigInteger Fibonacci (int x)
{
    var prevalue = new BigInteger ( -1);
    var curvalue = new BigInteger (1);
    for (int i = 0; I <= x; ++i)
    {
        var sum = prevalue + curvalue;
        Prevalue = Curvalue;
        Curvalue = sum;
    }
    return curvalue;
}

Assign the X to 47 again, and run the result as shown below:

2 Complex

Complex Tong BigInteger is also under the System.numerics namespace. Simply put, a class that computes a complex number. Look at the example below

private static void Complexdemo ()
{
    var z1 = new Complex (3, 4);
    var z2 = new Complex (5, 6);

    var r1 = Complex.add (z1, Z2);
    var r2 = complex.subtract (z1, Z2);
    var r3 = complex.multiply (z1, Z2);
    var r4 = complex.divide (z1, Z2);

    Console.WriteLine ("Z1+Z2:" + R1);
    Console.WriteLine ("Z1-Z2:" + R2);
    Console.WriteLine ("Z1*Z2:" + R3);
    Console.WriteLine ("Z1/Z2:" + R4);
}

The results of the operation are shown below:

3 Tuple

Tuple can define a lot of complex information, and realize a variety of flexible format definitions.

Create a collection of single data types

var a = Tuple.create (2, 3, 4, 5);
var B = tuple.create ("oec2003", "oec2004", "oec2005");

Create a collection of complex types

public static Tuple<int, String, Uri, datetime> GetInfo ()
{return
    tuple.create<int, string, Uri, Datetime> ("oec2003", New 
        Uri ("http://oec2003.cn"), DateTime.Now);

  4 sortedset<t>

Sortedset<t> is a collection of stored data that can be sorted. A simple example is initialized to a unordered set of integers, and then the sequential output is ordered, as follows:

public static void Sortedsetdemo ()
{
    int count = 0;
    var Set1 = new Sortedset<int> () {1,5,3,9,4,6};
    foreach (int i in Set1)
    {
        count++;
        Console.Write (i);
        if (Count!= Set1. Count) Console.Write (",");
    }   
}

In addition to sorting, you can also find a set of maximum, minimum and set scope of the set, see the following example:

public static void Sortedsetdemo ()
{
    var set1 = new Sortedset<int> () {8, 5, 3, 9, 4, 6};
    Console.WriteLine ("Mixvalue:" + Set1.) Min);
    Console.WriteLine ("MaxValue:" + Set1.) MAX);
    Console.Write ("subset:");
    var subset = Set1. Getviewbetween (5, 9);
    int count = 0;
    foreach (int i in subset)
    {
        count++;
        Console.Write (i);
        if (Count!= subset.count) Console.Write (",");
    }   
}