Convert string to float on C#

Question

What I’ve learned so far when we want to use the command Console.Readline() to read data that the user type we have to perform a conversion when this data is not of the type string, I know the command .Parse(), but per habit I have used the command Convert.ToInt16() for example, but I noticed that there is a "Convert"... for almost all formats except for the Float, I know I could use the Convert.ToDouble, that would serve in the same way, or even the Float.Parse(), but I was wondering why I can’t use the Convert for float.

Answer 1

All of these are wrong for the purpose described. If it is undetermined if the data is correct you cannot trust it, then it is normal if it is wrong, invalid, which cannot be converted, so the only correct way to perform this operation is to try to convert and check whether the operation worked or not. Although it works in other ways, the most correct and efficient is the use of TryParse(). Its use has already been answered in Differences between Parse vs Tryparse. See also because the use of Convert is inappropriate. See also about the use of cast.

This goes for any type of conversion, not just for float. If you have a text and it is not guaranteed of what is written there need to do the process of Parsing to understand what is in the text, validate and then make the conversion. The Parse() can be used when you are sure that the data is valid and will certainly be converted correctly, which is not the case in data entry by the console.

The guy float has his TryParse(), use it and you don’t even have to worry about it.

Nor is there a Convert.ToInt() because the guy from framework flame int (there is a Convert.ToInt32() which is the name . NET uses), as well as the float for C# is the same as the Single for .NET. NET needs to work with the universal name of the type, so there is a Convert.ToSingle(). The name float it’s just one alias that C# uses, not the official name of the type that can be used for other languages.

But every time you meet one string the ideal is not to convert and yes parse. Even if you have a situation that ensures that the data is a valid floating type number the most correct is the use of the float.Parse(). A case that could be useful using the Convert.ToSingle() is if the value can be null, but this pattern should be avoided, at least you should check first. If language were created today this method would not even exist.

But there are several other questions showing the correct use (this is one of the most poorly used things by programmers).

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Answer 2

The Float is called Single no . NET Framework. Use the class System.Single to perform conversions float.

float numero = global::System.Single.Parse("2.5");    

C# uses the default C language and has inherited the name float. float is a floating number of a single accuracy, already double, is a floating number of double precision.