问题
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;
回答1:
Convert.ToInt64("1100.25")
Method signature from MSDN:
public static long ToInt64(
string value
)
回答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...
- Math.Round
- Math.Ceil
回答3:
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.
回答4:
You can also use long.TryParse and long.Parse.
long l1;
l1 = long.Parse("1100.25");
//or
long.TryParse("1100.25", out l1);
回答5:
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!
回答6:
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
回答7:
long l1 = Convert.ToInt64(strValue);
That should do it.
回答8:
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);
回答9:
long=convert.toDouble("strvalue")
来源：https://stackoverflow.com/questions/6330306/how-could-i-convert-data-from-string-to-long-in-c-sharp