How to replace string.empty to “0”

Question

Just like the title says.

I\'ve tried doing str.Replace(\"\",\"0\"); but it gave me error because oldValue has zero length.

Is it possi

Answer 1

It sounds like your best option would be int.TryParse, if you encounter a string that can't be set to a valid value, it will set it to the default value for an integer (0) as well as returning a boolean so you can know this has happened.

int myInt;
if(!int.TryParse(myStringVariable, out myInt))
{
    //Invalid integer you can put something here if you like but not needed
    //myInt has been set to zero
}

//The same code without the if statement, still sets myInt
int.TryParse(myStringVariable, out myInt);

Answer 2

If you know that str is empty then you may use star="a" If you want to check then write statement in if condition.

Answer 3

String.Replace takes two string arguments oldValue and newValue. You specified the newValue 0 however an empty string is not legal for the oldValue.

try below code :-

str.Replace(" ","0"); 

or you can just assign "0" to emptry string as below :-

if(str == string.Empty)
{
   str = "0";
}

or making it simple :-

String.IsNullOrWhiteSpace(str) ? "0" : str;

Answer 4

It is not possible to replace string.Empty by "0". It will throw ArgumentException.

    An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll.
Additional information: String cannot be of zero length.

You can try following code:

if(retString == string.Empty)
{
retString = "0";
}

Answer 5

Try This...

public string Method1()
{
      string retString = string.Empty;
      //Do Something
      return string.IsNullOrEmpty(retString)?"0":retString;
}

Answer 6

If you want to check if the value is empty and then set the value to zero, otherwise use the default value you can use an inline if like so:

return string.IsNullOrWhiteSpace(retString ) ? "0" : retString;