How could I convert data from string to long in c

Question

How could i convert data from string to long in C    I have data   String strValue i    1100 25     now i want it in  long l1

User · Answer

http   msdn microsoft com en-us library system convert aspx  l1   Convert ToInt64 strValue   Though the example you gave isn t an integer  so I m not sure why you want it as a long

User · Answer

You can create your own conversion function      static long ToLong string lNumber                if  string IsNullOrEmpty lNumber               throw new Exception  quot Not a number  quot            char   chars   lNumber ToCharArray            long result   0          bool isNegative   lNumber 0      -           if  isNegative  amp  amp  lNumber Length    1              throw new Exception  quot - Is not a number  quot             for  int i    isNegative   1 0   i  lt  lNumber Length  i                          if   Char IsDigit chars i                                  if  chars i          amp  amp  i  lt  lNumber Length - 1  amp  amp  Char IsDigit chars i 1                                          var firstDigit   chars i   1  - 48                      return  isNegative   -1L 1L     result     firstDigit  lt  5    0L   1L                                          throw new InvalidCastException   quot   lNumber  is not a valid number  quot                              result   result   10     long chars i  - 48L                     return  isNegative   -1L 1L    result         It can be improved further   performance wise make the validation stricter in the sense that it currently doesn t care if characters after first decimal aren t digits specify rounding behavior as parameter for conversion function  it currently does rounding

User · Answer

You can also use long TryParse and long Parse   long l1  l1   long Parse  1100 25      or long TryParse  1100 25   out l1

User · Answer

You won t be able to convert it directly to long because of the decimal point i think you should convert it into decimal and then convert it into long something like this   String strValue i     1100 25   long l1   Convert ToInt64 Convert ToDecimal strValue      hope this helps

User · Answer

If you want to get the integer part of that number you must first convert it to a floating number then cast to long   long l1    long Convert ToDouble  1100 25      You can use Math class to round up the number as you like  or just truncate      Math Round Math Ceil

User · Answer

long l1   Convert ToInt64 strValue    That should do it

User · Answer

long is internally represented as System Int64 which is a 64-bit signed integer  The value you have taken  1100 25  is actually decimal and not integer hence it can not be converted to long   You can use   String strValue    1100 25   decimal lValue   Convert ToDecimal strValue     to convert it to decimal value

User · Answer

You can also do using Int64 TryParse Method  It will return  0  if their is any string value but did not generate an error   Int64 l1   Int64 TryParse strValue  out l1

User · Answer

This answer no longer works  and I cannot come up with anything better then the other answers  see below  listed here   Please review and up-vote them  Convert ToInt64  quot 1100 25 quot    Method signature from MSDN  public static long ToInt64      string value

[c#] How could I convert data from string to long in c#

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