Wednesday, 2 January 2013
Tuesday, 11 December 2012
stopwatch example in c#
In c# provides a unique way of packing together different
data types called as struct.
Struct is a simple lightweight alternative to class,but
struct are basically same as class even though they have some significant
difference between struct and class.
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Classes
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Structs
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Classes are declared using Class
keyword
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Struct are declared using Struct
keyword
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Its a refrence type therefore its stored on the heap
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It’s a value type and
therefore stored on the stack
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Support inheritance
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Does not support inheritance
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Default value of the class type is null
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Default value is the value produced by ‘zeroing out’
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Permit initialization of instance fields
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Do not Permit initialization of instance fields
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Permit declaration of parameterless constructors
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Do not Permit declaration of parameterless constructors
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Destructors is supported
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Destructors is not
supported
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Assignment copies the reference
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Assignment copies the vaues
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Difference and performance between Array and ArrayList in C#
- Arrays are fixed size .
- It’s used the namespace as System.
- Array cannot resize automatically.
- But in Vb.net array can resize themself by using ReDim Statement.When using ReDime array can losses the data and its modify the array structure as mention in the ReDim statement.
- But this ReDim statement is not available in C#.
- Array has contains one data type i.e. Homogenous data type.
- Arrays are multidimensional.
- The data in an array is accessed by indexes.
- For performance always recommended using arrays.
- If you delete an item in an array, it keeps that position empty, its wait for anther data to fill the positions.
Syntax:
string[] str = new string[5];
str[0] = "DotNet";
str[1] = "DotnetCode";
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ArrayList:
- ArrayList are variable in size.
- It’s used the namespace as System .Collections
- ArrayList grows automatically i.e. the numbers of items are added to the arrayList.
- ArrayList contain many data types i.e. heterogenous data type. In a single Arraylist we can store any data type - integer, string and any type of object inherited from System.Object.
- ArrayList is always single-dimensional.
- If you delete an item in an arraylist, that position is occupied by the next element.
- We can add, insert and delete items into an ArrayList.
Syntax:
ArrayList astr = new ArrayList();
astr.Add("str");
astr.Remove("str");
astr.RemoveAt(0);
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Check the performance between Array and ArrayList in C#
int[]
rate = new int[501];
ArrayList
str1 = new ArrayList();
Stopwatch
watch = new Stopwatch();
watch.Start();
for (int i = 0; i <= 500; i++)
{
rate[i] = i;
}
watch.Stop();
Response.Write("ARRAY SECONDS :" + watch.Elapsed.TotalMilliseconds);
watch.Reset();
watch.Start();
for (int i = 0; i <= 500; i++)
{
str1.Add(i);
}
watch.Stop();
Response.Write("ARRAYLIST
SECONDS :" +
watch.Elapsed.TotalMilliseconds);
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Result :
When compare Performance
array is better than ArrayList
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