.NET Tips and Tricks

Blog archive

Fill a String with Characters

Sometimes you need a string that's filled with a specific number of characters. There are lots of ways to do that but the easiest is to use the New keyword with the String class because the New keyword gives you access to the String object's constructors.

In fact, the String class has three constructors. The first one initializes the string with whatever you pass to the constructor. This one initializes the string to four equals signs:

  x = New String("====")

Of course, that's not much of an improvement over what you'd do normally:

  X = "===="

But the second constructor is more useful because it accepts a character, an integer and then repeats the character the number of times specified by the integer. This example initializes the string with however may equals signs are specified by initCount:

  x = New String("=", initCount)

The third constructor is the most interesting, though I doubt that I'll ever use it. The third constructor lets you initialize the string with a set of characters from a Char array beginning at some point in the array and for some number of characters. This example initializes the string with the digits from 123456789, starting at the position specified in initStart and for the length specified in initLength:

  x = New String("123456789", initStart, initLength)

If initStart was set to 2 and initLength was set to 4 then x would be set to "3456".

Posted by Peter Vogel on 02/09/2015 at 2:20 PM


comments powered by Disqus

Featured

  • How to Create a Machine Learning Decision Tree Classifier Using C#

    After earlier explaining how to compute disorder and split data in his exploration of machine learning decision tree classifiers, resident data scientist Dr. James McCaffrey of Microsoft Research now shows how to use the splitting and disorder code to create a working decision tree classifier.

  • Microsoft: Move from Traditional ASP.NET to 'Core' Requires 'Heavy Lifting'

    There are plenty of reasons to move traditional ASP.NET web apps -- part of the old .NET Framework -- to the new cross-platform direction, ASP.NET Core, but beware it will require some "heavy lifting," Microsoft says.

  • Purple Blue Nebula Graphic

    How to Compute Disorder for Machine Learning Decision Trees Using C#

    Using a decision tree classifier from a machine learning library is often awkward because it usually must be customized and library decision trees have many complex supporting functions, says resident data scientist Dr. James McCaffrey, so when he needs a decision tree classifier, he always creates one from scratch. Here's how.

  • Blazor's Future: gRPC Is Key

    Blazor guru Steve Sanderson detailed what Microsoft is thinking about the future of the revolutionary project that enables .NET-based web development using C# instead of JavaScript, explaining how gRPC is key, along with a new way of testing and a scheme for installable desktop apps.

  • Don't Do It All Yourself: Exploiting gRPC Well Known Types in .NET Core

    If you're creating business services that send dates and decimal data then you may be concerned that gRPC services don't support the relevant data types. Don't Panic! There are solutions. Here's how to use them.

.NET Insight

Sign up for our newsletter.

Terms and Privacy Policy consent

I agree to this site's Privacy Policy.

Upcoming Events