C＃中的wtol等价物

Question

I am translating some code from C++ to C# and there is a function wtol which takes a string input and outputs an integer. Specifically, it takes version string 6.4.0.1 and converts that to 4. How do I do that in C#? I tried convert.toInt32 but it failed miserably.

Answer 1

Try this (Assuming you have a number between first and second dot):

string myString = "6.4.0.1";

int myInt = Convert.ToInt32(myString.Split('.')[1]);

Bit safer method would be (Assuming at least one dot in the string):

int myInt = 0;
int.TryParse(myString.Split('.')[1], out myInt);

Safest method would be:

int myInt = 0;
string[] arr = myString.Split('.');

if(arr.Length > 1 && int.TryParse(arr[1], out myInt))
{
   //myInt will have the correct number here.
} 
else
{
   //not available or not a number
}

Answer 2

You could use (requires .Net 4.0 or higher)

Version.Parse("6.4.0.1").Minor

This will work pre .Net 4.0

new Version("6.4.0.1").Minor

Answer 3

Use this assuming that you will ALWAYS have a format that is XXXX

var test = "6.4.0.1";
var parts = test.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
int result = int.Parse(parts[1]);

Answer 4

I would suggest to use TryParse instead of just Parse , in case you are taking the version number from a not trusted source.

var versionString = "6.4.0.1";
Version version;
if (Version.TryParse(versionString, out version))
{
    // Here you get your 4
    Debug.WriteLine("The version Integer is " + version.Minor);  
}
else
{
    // Here you should do your error handling
    Debug.WriteLine("Invalid version string!"); 
}