Reading the value of a performance counter on Windows with C# .NET

In this post we saw how to list all performance categories and the performance counters within each category. It’s equally straightforward to read the value of a performance counter. You’ll need at least the category and the name of the performance counter. If the counter is available in multiple instances then you’ll need to specify the instance name as well.

The following code will read the CPU usage and memory usage counters:

private static void ReadValuesOfPerformanceCounters()
	PerformanceCounter processorTimeCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
	PerformanceCounter memoryUsage = new PerformanceCounter("Memory", "Available MBytes");			
	Console.WriteLine("CPU usage counter: ");
	Console.WriteLine("Category: {0}", processorTimeCounter.CategoryName);
	Console.WriteLine("Instance: {0}", processorTimeCounter.InstanceName);
	Console.WriteLine("Counter name: {0}", processorTimeCounter.CounterName);
	Console.WriteLine("Help text: {0}", processorTimeCounter.CounterHelp);
	Console.WriteLine("Memory usage counter: ");
	Console.WriteLine("Category: {0}", memoryUsage.CategoryName);
	Console.WriteLine("Counter name: {0}", memoryUsage.CounterName);
	Console.WriteLine("Help text: {0}", memoryUsage.CounterHelp);
	while (true)
		Console.WriteLine("CPU value: {0}", processorTimeCounter.NextValue());
		Console.WriteLine("Memory value: {0}", memoryUsage.NextValue());

Here’s an excerpt of the output:

Reading values of performance counters

You can view all posts related to Diagnostics here.

Using the StringComparer class for string equality with C# .NET

In this post we saw how to use the generic IEqualityComparer of T interface to indicate equality for our custom types. If you need a similar comparer for strings then there’s a ready-made static class called StringComparer which can construct string comparers for you.

The StringComparer class provides comparers for the common string comparison scenarios: ordinal, locale specific and invariant culture comparisons. This is a good MSDN article on the differences between these.

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Introduction to ASP.NET Core part 27: showing the user status and logging out


In the previous post we looked at the basics of authorisation and the log in process in .NET Core. The Authorization attribute which can be used for controllers and action methods helps us introduce a basic form of restrictions. The visitor must be logged in in order to reach the restricted sections in the application. The login process is handled by the built-in SignInManager service class. It offers a range of functions related to the user’s state. We also saw the importance of the return URL property which enables us to redirect the user to the page that they wanted to visit before logging in.

In this post we’ll look at how to log out and how to show the user’s status in the top section of each page.

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Declaring a type as a Tuple in F#

We saw how Tuples work in F# in this post. Tuples are containers for various elements such as this one:

let myFirstTuple = (45, "hello world", 5., true, addThreeNumbers)

If you’d like to declare a type to be of Tuple then you can use the ‘*’ character as follows:

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Enumerations and pattern matching in F#

Enumeration types in F# are declared using the pipe symbol. Each element will have an integer value. Here’s an example with the first 6 months of the year:

type MonthsInFirstHalf = January = 1 | February = 2 | March = 3 | April = 4 | May = 5 | June = 6

We select an element using the dot notation which is the same as in C# or Java:

let april = MonthsInFirstHalf.April

The more interesting language construct is the F# equivalent of the switch statements to check for the value of the enumeration. In F# it’s called pattern matching.

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Using the KeyedCollection object in C# .NET

The abstract generic KeyedCollection object can be used to declare which field of your custom object to use as a key in a Dictionary. It provides sort of a short-cut where you’d want to organise your objects in a Dictionary by an attribute of that object.

Let’s take the following object as an example:

public class CloudServer
	public string CloudProvider { get; set; }
	public string ImageId { get; set; }
	public string Size { get; set; }

The Image IDs are always unique so the ImageId property seems to be a good candidate for a dictionary key.

Here’s an example:

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Introduction to ASP.NET Core part 26: authorisation basics and logging in


In the previous post we continued looking into the basics of user management in .NET Core. We first created a separate database for our users and related objects such as claims and tokens. We then went on and created the components necessary for user creation: the view, the account controller and the user registration view model. We used the built-in generic UserManager of T for the database section of user management. The UserManager object provides a wide range of functions to handle users: insert a new user, retrieve a user by ID, confirm an email and much more. Therefore UserManager is an out-of-the-box service class to connect the application user and the database.

In this post we’ll investigate the basics of what to do with our users: authorisation and logging in.

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