如何在 C # 中将字符串转换为整数

int a = int.Parse(myString);

or better yet, look into int.TryParse(string)

int myInt = System.Convert.ToInt32(myString);

As several others have mentioned, you can also use int.Parse() and int.TryParse().

If you're certain that the string will always be an int:

int myInt = int.Parse(myString);

If you'd like to check whether string is really an int first:

int myInt;
bool isValid = int.TryParse(myString, out myInt); // the out keyword allows the method to essentially "return" a second value
if (isValid)
{
int plusOne = myInt + 1;
}

If you are sure that you have "real" number in your string, or you are comfortable of any exception that might arise, use this.

string s="4";
int a=int.Parse(s);

For some more control over the process, use

string s="maybe 4";
int a;
if (int.TryParse(s, out a)) {
// it's int;
}
else {
// it's no int, and there's no exception;
}

Do something like:

var result = Int32.Parse(str);

If you're sure it'll parse correctly, use

int.Parse(string)

If you're not, use

int i;
bool success = int.TryParse(string, out i);

Caution! In the case below, i will equal 0, not 10 after the TryParse.

int i = 10;
bool failure = int.TryParse("asdf", out i);

This is because TryParse uses an out parameter, not a ref parameter.

int i;
string whatever;


//Best since no exception raised
int.TryParse(whatever, out i);


//Better use try catch on this one
i = Convert.ToInt32(whatever);

string varString = "15";
int i = int.Parse(varString);

or

int varI;
string varString = "15";
int.TryParse(varString, out varI);

int.TryParse is safer since if you put something else in varString (for example "fsfdsfs") you would get an exception. By using int.TryParse when string can't be converted into int it will return 0.

int i;


string result = Something;


i = Convert.ToInt32(result);

class MyMath
{
public dynamic Sum(dynamic x, dynamic y)
{
return (x+y);
}
}


class Demo
{
static void Main(string[] args)
{
MyMath d = new MyMath();
Console.WriteLine(d.Sum(23.2, 32.2));
}
}

4 techniques are benchmarked here.

The fastest way turned out to be the following:

y = 0;
for (int i = 0; i < s.Length; i++)
y = y * 10 + (s[i] - '0');

"s" is your string that you want converted to an int. This code assumes you won't have any exceptions during the conversion. So if you know your string data will always be some sort of int value, the above code is the best way to go for pure speed.

At the end, "y" will have your int value.

You can use either,

    int i = Convert.ToInt32(myString);

or

    int i =int.Parse(myString);

bool result = Int32.TryParse(someString, out someNumeric)

This method will try to convert someString into someNumeric, and return a result depending on whether or not the conversion is successful: true if conversion is successful and false if conversion failed. Take note that this method will not throw an exception if the conversion failed like how Int32.Parse method did and instead returns zero for someNumeric.

For more information, you can read here:

https://msdn.microsoft.com/en-us/library/f02979c7(v=vs.110).aspx?cs-save-lang=1&cs-lang=csharp#code-snippet-2
&
How to convert string to integer in C#