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

c# string type-conversion long-integer

311,755

Solution 1

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("1100.25")

Method signature from MSDN:

public static long ToInt64(
    string value
)

Solution 2

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...

Solution 3

You can also use long.TryParse and long.Parse.

long l1;
l1 = long.Parse("1100.25");
//or
long.TryParse("1100.25", out l1);

Solution 4

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.

Solution 5

long l1 = Convert.ToInt64(strValue);

That should do it.

View more solutions

311,755

Author by

MayureshP

web developer

Updated on July 24, 2020

Comments

MayureshP almost 4 years
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;
```
- Jon Skeet almost 13 years
  
  Longs represent integers. You've given a non-integer. What would you want to do with that?
- magma almost 13 years
  
  What if strValue is "1100.75" ? See: stackoverflow.com/questions/633335/…
- love Computer science almost 13 years
  
  @magma: if you convert it into decimal then it will round off the number, i.e in this case if given number was 1100.75 then it will output 1101.
- magma almost 13 years
  
  @charlie I was merely raising the issue, because MayP did not appear to be fully aware of the implication here. He might want to simply get rid of the non-integer part without any rounding, and that's fine, provided that it's really what he wants. Thank you though.
Andrew Savinykh almost 13 years

This is going to give you FormatException if you run this on the specified input.
Thomas Levesque almost 13 years

@zespri, no, at least not in most cultures... But it would indeed fail in cultures where the decimal separator is not "."
Pranesh Janarthanan over 3 years

using your code, this value 2037104000005652013 changed to 2037104000005651968. ?
Etienne de Martel about 2 years

You need to specify an explicit culture that treats . as a decimal separator (CultureInfo.InvariantCulture would work).
Etienne de Martel about 2 years

@PraneshJanarthanan The biggest integer that can be safely represented in a double is 2^53, and yours is bigger than that, so when converted to a long you'll get some funky results.
César León almost 2 years

Not recomended when used with linq. It gives me an exception. long.Parse("1100.25") works for me