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C# First Sentence
Get the first sentence from a paragraph using a for-loop and switch statement.First sentence. A first sentence has importance. How can we get the first sentence in a paragraph? Parsing the English language is exceedingly hard. Instead of aiming for a perfect implementation, we present here a simple method.
Example. The FirstSentence method presented here loops through the paragraph string beginning at the first character. When the period is encountered, it checks that the period is followed by a whitespace. This signals the end of a sentence.
Also: In the switch, the "?" and the "!" characters are considered sentence ending characters.
C# program that gets first sentence
using System;
class Program
{
static void Main()
{
string paragraph =
"Thank you for visiting this article. There are " +
"more articles on this website.";
Console.WriteLine(FirstSentence(paragraph));
paragraph =
"How can you make more money? The easiest thing to do " +
"would be to spend less.";
Console.WriteLine(FirstSentence(paragraph));
}
public static string FirstSentence(string paragraph)
{
for (int i = 0; i < paragraph.Length; i++)
{
switch (paragraph[i])
{
case '.':
if (i < (paragraph.Length - 1) &&
char.IsWhiteSpace(paragraph[i + 1]))
{
goto case '!';
}
break;
case '?':
case '!':
return paragraph.Substring(0, i + 1);
}
}
return paragraph;
}
}
Output
Thank you for visiting this article.
How can you make more money?
We require a period and space for the ending character of a sentence because many abbreviations are used in the English language. For example, a URL like "www.dotnetCodex.com" has no sentence ending characters.
Note: This method has weaknesses. It will consider the title "Mr" to end a sentence. This problem occurs in other places too.
However: Creating a method that handles all cases in the English language is challenging.
Summary. Sometimes, a simple method that handles most cases is appropriate. This method will work for writing samples that exclude certain words. An interesting challenge in computer science is handling natural languages.
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- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression