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Articles on Trending Technologies
Technical articles with clear explanations and examples
Explain the iterator pattern in .NET
The iterator pattern is used to loop over the elements in a collection and is implemented using the IEnumerator interface. It defines the basic low-level protocol through which elements in a collection are traversed—or enumerated. This is done in a forward-only manner.Here's the IEnumerator interface in C#.public interface IEnumerator{ bool MoveNext(); object Current { get; } void Reset(); }MoveNext advances the current element or "cursor" to the next position, returning false if there are no more elements in the collection.Current returns the element at the current position (usually cast from object to a more specific type). MoveNext ...
Read MoreExplain how the assemblies and DLLs work in .NET
Assembly contains all the compiled types in your application along with their Intermediate Language (IL) code. It is also the basic unit of deployment in .NET. In the latest versions of .NET, i.e. .NET Core, an assembly is a file with a .dll extension, which stands for Dynamic Link Library.There are primarily four items in an assembly.Compiled TypesThe compiled IL code for all the types in your application.Assembly ManifestContains the metadata needed by the Common Language Runtime, such as the dependencies and versions that this DLL references.Its purpose is to describe the assembly to the runtime via the assembly's data, ...
Read MoreExplain the custom value types in .NET
Variables of value types directly contain the values. When you assign one value type variable to another, each variable associates with a different storage location in memory. Hence, Changing the value of one value type variable doesn't affect the value in the second variable.Similarly, when you pass an instance of a value type to a method, the compiler copies the memory associated with the argument to a new location associated with the parameter. Any changes to the parameter won't affect the original value. Since memory is copied for value types, they should be small (typically, less than 16 bytes).All the ...
Read MoreExplain how reflection works in .NET framework
A C# program compiles to a DLL assembly that contains the compiled C# code along with the metadata for the runtime, and other resources. C# provides a reflection API that lets us inspect the metadata and compiled code at runtime.Using reflection, it's possible to −Access the assembly metadata for all types inside the assemblyObtain a list of types and their members (methods, properties, etc.)Dynamically invoke the type members at runtime.Instantiate objects by only providing their nameBuild assembliesIn a traditional program, when you compile the source code to the machine code, the compiler removes all the metadata about the code. However, ...
Read MoreHow to get the file extension using PowerShell?
We can retrieve the file extension using multiple ways. First, using the [System.IO.Path] class.PS C:\> [System.IO.Path]::GetExtension("C:\temp\25Aug2020.txt") .txt PS C:\> [System.IO.Path]::GetExtension("C:\temp\azcopy.zip") .zipThis is the easiest way to get the file extension. Otherways, Using programmatically, PS C:\> ((Split-Path "C:\Temp\azcopy.zip" -Leaf).Split('.'))[1] zip PS C:\> ((Split-Path "C:\Temp\25Aug2020.txt" -Leaf).Split('.'))[1] txtUsing Get-ChildItem, PS C:\> (Get-ChildItem C:\Temp\azcopy.zip).Extension .zip PS C:\> (Get-ChildItem C:\Temp\25Aug2020.txt).Extension .txtUsing Get-Item, PS C:\> (Get-Item C:\Temp\azcopy.zip).Extension .zip
Read MoreHow to set the local user account settings using PowerShell?
To set the local user account settings related to the account or the password expiration, we can use the Set-LocalUser command.The below command will change the local user Testuser account and password set to never expire.Set-LocalUser -Name Testuser -AccountNeverExpires -PasswordNeverExpires $true -VerboseThe below command will set the account expiry,Set-LocalUser -Name Testuser -AccountExpires 05/11/2022 -VerboseTo run the above commands on the remote computers, use the Invoke-Command.Invoke-Command -ComputerName Computer1, computer2 -ScriptBlock{ Set-LocalUser -Name Testuser -AccountNeverExpires -PasswordNeverExpires $true -Verbose } Invoke-Command -ComputerName Computer1, computer2 -ScriptBlock{ Set-LocalUser -Name Testuser -AccountExpires 05/11/2022 -Verbose }
Read MoreHow to validate the path with the PowerShell function parameter?
To validate the file or folder path inside the PowerShell function parameter, we need to use the ValidateScript command. Generally, we write the script as below to validate the path.function Validate-Path{ param( [parameter(Mandatory)] [String]$Path ) if(Test-Path $Path) {Write-Output "Path is valid"} else{Write-Output "Path is invalid"} }OutputPS C:\> Validate-Path -Path C:\Temp Path is validWe can add similar functionality inside the function parameter with the validatescript argument so the script will throw the error initially at the parameters check. See below, function Validate-Path{ param( [parameter(Mandatory)] ...
Read MoreHow to copy files of the specific extension using PowerShell?
To copy the files using the specific files extension using PowerShell, we can use the Copy-Item command.The below command will copy only the .ps1 files from the source to the destination.For example, PS C:\> Copy-Item -Path C:\Temp -Recurse -Filter *.ps1 -Destination C:\Temp1\ -VerboseIf the C:\Temp1 doesn't exist, it will create the destination folder and then copy the content of the file but the problem with this command is it copies the subfolders as well which doesn’t have the .ps1 file.So to copy the with the same folder structure without empty directories and the specific file extension we can write the ...
Read MoreHow to get the disabled local user accounts using PowerShell?
To get the disabled local user accounts using PowerShell on the local and the remote system, we can use the WMI or the CIM instance method with the Win32_UserAccount class and the Disabled property to filter the result.PS C:\> gwmi win32_useraccount | where{$_.Disabled -eq $true}You can filter out the properties using the specific properties use the Select-Object pipeline command.PS C:\> gwmi win32_useraccount | where{$_.Disabled -eq $true} | Select Name, FullName, CaptionYou can also use the CIM instance method alternatively, PS C:\> Get-CimInstance win32_useraccount | where{$_.Disabled -eq $true}To get the disabled accounts on the remote systems, use the -ComputerName parameter in ...
Read MoreHow to create a new local user in windows using PowerShell?
To create a new local user in the Windows operating system using PowerShell, we can use the New-LocalUser cmdlet. The below command will create the TestUser with no password.New-LocalUser -Name TestUser -NoPasswordOutputName Enabled Description ---- ------- ----------- TestUser TrueTestUser account has been enabled here. To provide the password for the user, the password should be in the secure string format. We can pass the password as shown below.$pass = "Admin@123" | ConvertTo-SecureString -AsPlainText -Force New-LocalUser -Name TestUser -Password $passThe above commands will create the TestUser with the password. To add the password and account-related settings we can directly provide parameters ...
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