Using implicit typing to determine the type of a loop variable?

Question

.NET

I read off. C# manual ( Here ), and there it says:

It is recommended that you use implicit typing to determine the type of a loop variable in for and foreach loops.

For:

var phrase = "lalalalalalalalalalalalalalalalalalalalalalalalalalalalalala";
var manyPhrases = new StringBuilder();
for (var i = 0; i < 10000; i++)
{
    manyPhrases.Append(phrase);
}
//Console.WriteLine("tra" + manyPhrases);

Foreach:

foreach (var ch in laugh)
{
    if (ch == 'h')
        Console.Write("H");
    else
        Console.Write(ch);
}
Console.WriteLine();

And now I have a question, why is implicit typing recommended? If I specify int instead of var , then there may be some pitfalls or something like that? Or is it just accepted, and this is how it should be done, because everyone does it?)

Answer 1

On the contrary, if you explicitly specify the type yourself, there will definitely be no problems.
It's just that var is a shorter notation, and is very often used when the type on the right is known exactly, or vice versa is unknown (anonymous var a = new { A = 1, B = 2}).
There may be problems with var , for example, when we expected FLOAT, but received DOUBLE (for this, you can either specify the type or use the F or D postfix). (var will be converted to the nearest enclosing type)
When I started learning C#, I also did not immediately understand what the joke was, but over time I switched to var myself .
The code is shorter and there is less duplicate information:
Customer c = new Customer();
var c = new Customer();
When to Use and Not Use var in C#