dynamic if condition from string [duplicate]

Question

I am generating a expression from some business rules and it might look like this

0 > 1
12 < 14
"abc" != "xyz"
90 >= 12

Now I have to do certain implementations based on that condition. For example:

 string condition = "0 =1";
 if(condition)
 {
  // do something because condition is passed
 }
else
 { 
  // do something because condition is failed
 }

I have tried to do the same with the dynamic keyword but it is still not working. Any work around?

Edit : 1 modified code

string _initExp = "1";
string _validateCondition = "== 0";
string strcondition = _initExp + _validateCondition;
bool _condition = Convert.ToBoolean(strcondition); // Error statement

if (_condition)
{

}

For this your best bet would probably be using the recently release Roslyn C# compiler. That will allow you to parse and execute any piece of C# code as strings. — Erik Schierboom
– Erik Schierboom, Commented May 22, 2014 at 13:03
Read this: msdn.microsoft.com/en-us/library/86hw82a3(v=vs.110).aspx - as examples show you can't convert string 1 == 0 to bool value. — rosko
– rosko, Commented May 22, 2014 at 13:30
@Zerotoinfinite Try this, social.msdn.microsoft.com/Forums/vstudio/en-US/… — Bharadwaj
– Bharadwaj, Commented May 22, 2014 at 13:35

sshashank124 · Accepted Answer · 2014-05-22 13:06:39Z

4

Why not just use bool:

bool condition = 0==1;
if(condition)
{
   // do something because condition is passed
}
else
{ 
   // do something because condition is failed
}

You can also simplify the following code:

bool condition = 0==1;
if(condition)
{
   return true;
}
else
{ 
   return false;
}

to:

bool condition = 0==1;
return condition;

Or for custom return values

bool condition = 0==1;
return condition ? "yes" : "no";

edited May 22, 2014 at 13:06

answered May 22, 2014 at 13:00

sshashank124

32.3k10 gold badges72 silver badges76 bronze badges

Sign up to request clarification or add additional context in comments.

8 Comments

Bharadwaj Over a year ago

return condition; would be sufficient. Why to check once again.

Stijn Bernards Over a year ago

Or you could even use a lambda expression of some sorts.

sshashank124 Over a year ago

@Bharadwaj, Thank you. I wasn't able to express myself properly. I have updated my answer. Hope it is better.

Zerotoinfinity Over a year ago

I am getting my condition in string format ex: "0 == 1" , when I am using below code to convert it to bool it is not working, probably because it is not able to parse this string as bool bool _condition = Convert.ToBoolean(strcondition)

sshashank124 Over a year ago

@Zerotoinfinite, I think this will help: stackoverflow.com/questions/5029699/…

|

Collectives™ on Stack Overflow

dynamic if condition from string [duplicate]

1 Answer 1

8 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

8 Comments

Linked

Related