C Sharp _ w3mentor - Part 3

8/10/2019 C Sharp _ w3mentor - Part 3

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w3mentor> C Sharp

C Sharp

asp-dot-net-c-sharp

Check if a file is read only in C#

boolisReadOnly =((File.GetAttributes(filePath)&FileAttributes.ReadOnly)==FileAttributes.ReadOnly);

Display the call stack method names in C#

usingSystem.Diagnostics;

[STAThread]

publicstaticvoidMain()

{

//obtain call stack

StackTrace stackTrace =newStackTrace();

// obtain method calls (frames)

StackFrame[]stackFrames =stackTrace.GetFrames();

// display method names


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foreach(StackFrame stackFrame instackFrames)

{

Console.WriteLine(stackFrame.GetMethod().Name); // output method name

}

}

Get Name of the calling method using Reflection in C#

usingSystem.Diagnostics;

// get call stack

StackTrace stackTrace =newStackTrace();

// get calling method name

Console.WriteLine(stackTrace.GetFrame(1).GetMethod().Name);

C# Enqueue and Dequeue queue operations

QueuemyQueue =newQueue();

voidAddQueueItem(stringrequest)

{

myQueue.Enqueue(request);

}

stringGetNextQueueItem()

{

returnmyQueue.Dequeue();

}

Stack push and pop in C#StackmyStack =newStack();

voidaddRecord(stringmove)

{

myStack.Push(move);

}

stringGetLastRecord()

{

returnmyStack.Pop();

}

Arraylist properties and methods in C#

ArrayList alphaList =newArrayList();

alphaList.Add("A");

alphaList.Add("D");

alphaList.Add("W");

Console.WriteLine("Original Capacity");

Console.WriteLine(alphaList.Capacity);

Console.WriteLine("Original Values");

foreach(objectalpha inalphaList)

{

Console.WriteLine(alpha);

}

alphaList.Insert(alphaList.IndexOf("D"), "C");

alphaList.Insert(alphaList.IndexOf("W"), "J");

Console.WriteLine("New Capacity");

Console.WriteLine(alphaList.Capacity);

Console.WriteLine("New Values");

foreach(objectalpha inalphaList)

{

Console.WriteLine(alpha);

}

Declare and fill a two-dimensional array in C#

int[, ]my2DArray ={{1, 1}, {3, 5}, {5, 7}};

for(inti =0;i


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Console.WriteLine("Upper Bound");

Console.WriteLine(intArray.GetUpperBound(0));

Console.WriteLine("Array elements");

foreach(intitem inintArray)

{

Console.WriteLine(item);

}

Array.Reverse(intArray);

Console.WriteLine("Array reversed");


{


}

Array.Clear(intArray, 2, 2);

Console.WriteLine("Elements 2 and 3 cleared");

foreach(intitem inintArray){


}

intArray[4]=9;

Console.WriteLine("Element 4 reset");


{


}

Console.ReadLine();

Positioning elements on a Silverlight Canvas

The Canvas.Top and Canvas.Left attributes can be set within the children controls XAML to position within the Canvas relatively.

Set padding in silverlight code behind

Xaml:

Code behind:

namespace TestSilverlightApplication

{

publicpartialclassMainPage :UserControl

{

Button mybutton =null;

publicMainPage()

{

InitializeComponent();

}

privatevoidWindow_Loaded(objectsender, RoutedEventArgs e)

{

mybutton =newButton {Content ="Hi and Welcome", Width =150, Height =25};

mybutton.Padding=newThickness(10, 12, 10, 12);//set the padding using thickness

Canvas.SetLeft(mybutton, 100);

Canvas.SetTop(mybutton, 124);

canvas1.Children.Add(mybutton);


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}

}

}

Change canvas background in Silverlight .Net

Strip out all html tags in string using C#

The tags need not be correctly nested for the below implementation to work..

publicstaticstringRemoveHtmlTags(stringpInput)

{

char[]array =newchar[pInput.Length];

intarrayIndex =0;

boolinside =false;

for(inti =0;i


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response =exc.ResponseasHttpWebResponse;

}

// Check if response returns 404

if(response.StatusCode==HttpStatusCode.NotFound)

{

Console.WriteLine(urlfile1 +"Not Found");

}

else

{

if(response.StatusCode==HttpStatusCode.Ok)

{

Console.WriteLine(urlfile1 +"Found");

}

}

}

Ping a host machine to check uptime in C#

usingSystem;

usingSystem.Collections.Generic ;

usingSystem.Linq;

usingSystem.Text;

namespaceProgramSendPingtoHost

{

classProgramSendPingtoHost

{

staticvoidMain(string[]args)

{

try

{

stringhostAddress ="127.0.0.1"; System.Net.NetworkInformation .Pingping =newSystem.Net.NetworkInformation.Ping();

System.Net.NetworkInformation .PingReplyreply =ping.Send(hostAddress);

Console.WriteLine("The Host Address: {0}", reply.Address);

Console.WriteLine("Status of the ping: {0}", reply.Status);

Console.Read();

}

catch(Exception ex)

{

}

}

}

}

Output:

Convert Enum to Array dynamically in C#

usingSystem;


usingSystem.Linq;

usingSystem.Text;

namespaceProgramEmumtoArray

{

classProgramEmumtoArray

{


{

string[]people =Enum.GetNames(typeof(People));

foreach(var person inpeople)

{

Console.WriteLine(person);

}

Console.Read(); }

enumPeople

{

Gandhi, Anthony, Obama, Mani

}

}

}

Output:

Dynamic enumeration of Enum in C#


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usingSystem;


usingSystem.Linq;

usingSystem.Text;

namespacew3mentorConsoleApp

{

classProgram

{


{

foreach(var car inEnum.GetValues(typeof(Cars)))

{

Console.WriteLine(Enum.GetName(typeof(Cars), car));

}

Console.Read(); }

enumCars

{

Ferrari, Polo, GMC, FordExplorer

}

}

}

Output:

Sorting a hashtable in C#

Hashtable myHashTable =newHashtable();

myHashTable.Add("1", "dotnet");

myHashTable.Add("2", "tutorials");myHashTable.Add("3", "w3mentor");

ListmyList =newList();

foreach(var key inhash.Keys)

{

myList.Add(int.Parse(key.ToString()));

}

//sort the hashtable

myList.Sort();

foreach(var item inmyList)

{

Console.WriteLine(string.Format("{0},{1}", item, hash[item.ToString()]));

}

Console.Read();

Cloning C# objects using MemberwiseClone

publicCarClass GetCopy()

{

returnMemberwiseClone()asCarClass;

}

CarClass beta =newCarClass();

CarClass newcar =beta.GetCopy();

boolareCarsEqual =ReferenceEquals(beta, newcar);

Console.WriteLine("Are cars Equal?: {0}",areCarsEqual);

Example of stringbuilder append operation in C#

voiddemoAppendSB()

{

StringBuilder sb;sb =newStringBuilder("This is the existing text");

sb.Append("This will be appended");

Console.WriteLine("sb.Append(\"Appended\"): {0}",sb);

}

Delete newly created file from directory in C#

voiddeleteNewFile(stringdirPath)

{

DirectoryInfo directInfo =newDirectoryInfo(dirPath);//read directory to enumerate files

FileInfo[]filelist =directInfo.GetFiles();

var fileList =fromn infilelist selectnew{FileName =n.FullName, CreationDate =n.CreationTime.ToLongDateString()};//get list of

var latestFile =(fromm infileList orderby m.CreationDatedescending selectm.FileName).First();//get the first file from th

Console.WriteLine(latestFile);//display filename before deleting


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FileInfo file =newFileInfo(latestFile);

file.Delete();

Console.WriteLine(latestFile +" has been deleted");

Console.ReadKey();

}

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C Sharp _ w3mentor - Part 3