문자열을 Int로 변환하려면 어떻게 해야 하나요?

int x = Int32.Parse(TextBoxD1.Text);

int x = 0;

Int32.TryParse(TextBoxD1.Text, out x);

int x = 0;

if (Int32.TryParse(TextBoxD1.Text, out x))
{
    // you know that the parsing attempt
    // was successful
}

Convert.ToInt32( TextBoxD1.Text );

int val = 0;
Int32.TryParse( TextBoxD1.Text, out val );

if( Int32.TryParse( TextBoxD1.Text, out val ){
  DoSomething(..);
} else {
  HandleBadInput(..);
}

int.TryParse()

int myInt = int.Parse(TextBoxD1.Text)

bool isConvertible = false;
int myInt = 0;

isConvertible = int.TryParse(TextBoxD1.Text, out myInt);

int parsedInt = 0;
if (int.TryParse(TextBoxD1.Text, out parsedInt))
{
   // Code for if the string was valid
}
else
{
   // Code for if the string was invalid
}

String input = "123678";

int x = Convert.ToInt32(input[4]);  // returns 55

int x = Convert.ToInt32(input[4].toString());  // returns 7

int i = 0;
string s = "123";
i =int.Parse(s);
i = Convert.ToInt32(s);

int x = 0;
int.TryParse(TextBoxD1.Text, out x);

var culture = CultureInfo.GetCulture("en-US");
int result = 0;
if (int.TryParse(myString, NumberStyles.Integer, culture, out result))
{
    // use result...
}

public static class IntegerExtensions
{
    public static int ParseInt(this string value, int defaultValue = 0)
    {
        int parsedValue;
        if (int.TryParse(value, out parsedValue))
        {
            return parsedValue;
        }

        return defaultValue;
    }

    public static int? ParseNullableInt(this string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            return null;
        }

        return value.ParseInt();
    }
}

int myNumber = someString.ParseInt(); // returns value or 0
int age = someString.ParseInt(18); // with default value 18
int? userId = someString.ParseNullableInt(); // returns value or null

int yourValue = TextBoxD1.Text.ParseInt();

bool success = Int32.TryParse(TextBoxD1.Text, out val);

if (success)
{
// put val in database
}
else
{
// handle the case that the string doesn't contain a valid number
}

int i = Convert.ToInt32(TextBoxD1.Text);

int i =int.Parse(TextBoxD1.Text);

int x = Int32.TryParse(TextBoxD1.Text, out x)?x:0;

int xxiiqVal = Int32.Parse(strNabcd);

string strNii = "";
UsrDataAdapter.SelectCommand.Parameters["@Nii"].Value = Int32.Parse(strNii );

//May be quite some time ago but I just want throw in some line for any one who may still need it

int intValue;
string strValue = "2021";

try
{
    intValue = Convert.ToInt32(strValue);
}
catch
{
    //Default Value if conversion fails OR return specified error
    // Example 
    intValue = 2000;
}

string x=TextBoxD1.Text;
int xi=Convert.ToInt32(x);

int xi=Int32.Parse(x);

public static class StringExtensions
{
    /// 
    /// Converts a string to int.
    /// 
    /// <param name="value">The string to convert.The string to check.The out int parameter.

static int convertToInt(string a)
{
    int x=0;
    for (int i = 0; i < a.Length; i++)
        {
            int temp=a[i] - '0';
            if (temp!=0)
            {
                x += temp * (int)Math.Pow(10, (a.Length - (i+1)));
            }              
        }
    return x ;
}

int val = Int32.parse(stringToBeParsed);
int x = Int32.parse(1234);