How to scan a string and check content within it?

Question

I need to do a check with a certain text within a string. How do I go through this string and search the text to make this check ?

Example:

If(dentro da string contém "Olá")
{
   Mostre o valor determinado para essa string;
}

Answer 1

Use the method Contains() to know if one text is present within another:

if ("Olá Mundo".Contains("Olá")) {
    //Faça o que quer aqui
}

I put in the Github for future reference.

Answer 2

The method Contains() returns a value indicating whether a specified character substring occurs in this character string.

string suaString = "Olá mundo";

if (suaString.Contains("Olá") == true)
{
    Console.Write("A string contain 'Olá' ");
}

Since the Contains() method returns a Boolean and was used within an IF you do not need to validate with suaString.Contains("Olá") == true, I did it this way just to facilitate your understanding, so we usually do it this way:

string suaString = "Olá mundo";

if (suaString.Contains("Olá"))
{
    Console.Write("A string contém 'Olá' ");
}

Reference