Uncover the Power of String Contains Method
When working with strings in C#, understanding the Contains method is crucial for efficient coding. This method allows you to check if a specific substring exists within a string, making it a valuable tool in your programming arsenal.
The Syntax Behind Contains
The Contains method is a part of the String class and takes two parameters: str and comp. The str parameter is the string being checked, while comp determines whether the search is case-sensitive or not.
What to Expect from Contains
So, what does the Contains method return? It’s simple: if the string contains the specified substring, it returns True. If not, it returns False. Let’s dive into some examples to illustrate this.
Example 1: A Sweet Success
Imagine we have a string str with the value “I love eating ice cream.” Using the Contains method, we can check if it contains certain substrings:
str.Contains("ice cream")returnsTruebecause “ice cream” is indeed part of the string.str.Contains("chocolate")returnsFalsebecause “chocolate” is not present in the string.str.Contains("")returnsTruebecause an empty string is always considered a substring.
Example 2: A Case-Sensitive Conundrum
In this example, we’ll see how case sensitivity affects the Contains method. Suppose we have the same string str with the value “I love eating ice cream.” If we use str.Contains("ice"), it returns False because the method is case-sensitive.
Ignoring Case Sensitivity
But what if we want to ignore case sensitivity? We can do this by using the StringComparison enum. There are two options:
StringComparison.Ordinal: considers the letter caseStringComparison.OrdinalIgnoreCase: ignores the letter case
By using these options, we can customize the Contains method to suit our needs.
With the Contains method, you can streamline your coding and make string manipulation a breeze. By understanding its syntax, parameters, and return values, you’ll be well on your way to becoming a C# master.