is Strict On for c#?

In vb.net, if Strict On, this code won't compile:

VB Code:

dim x as string = ""
dim num as integer = 1
x = y
'this would be an error

in c#.net, this code WILL compile:

Code:

---

string x = "";
int num = 1;
x = num;

---

is there a way to make it so that the c# code DOES NOT compile.

I'm pretty sure that that won't compile in C#. You need to explicitly convert from an integer to a string. C# Doesn't have an "Option Strict" because C# is much more type-strict by default .

Edit: I just tried it to make sure ;)

Code:

---

Error 1: Cannot implicitly convert type 'int' to 'string'

---

C# is always strict. As it should be. :D

really? I just tried this:

Code:

---

int y = 1;
string x;
x = y;

---

and I got the error message about not being able to convert.

but if i change it to this:

Code:

---

int y = 1;
string x;
x = "hey" + y; //added "hey" with an append

---

and it compiles

Quote:

---

Originally Posted by benmartin101

really? I just tried this:

Code:

---

int y = 1;
string x;
x = y;

---

and I got the error message about not being able to convert.

but if i change it to this:

Code:

---

int y = 1;
string x;
x = "hey" + y; //added "hey" with an append

---

and it compiles

---

All type strict programming languages does that (maybe C doesn't) but why don't you want it to compile, a string is flixable and they designed it to be like this

The first case is assignment of a variable at runtime. The second case is assignment of a literal at compile time.

The first case does not work because you cannot ASSIGN an int value to a string variable. The second case works because of how the "+" operator is implemented. If one of the operands is a string and one is not the "+" operator will call ToString on the non-string operand to convert it to a string and then concatenate the two. Finally the resulting string is assigned to the string variable, so the assignment is not an issue. You can use any type of object and that second scenario will work because every object has a ToString method:

Code:

---

string x;
x = (new DataTable("Table")) + "hey";
MessageBox.Show(x);

---

This will display "Tablehey".

When string concatenation occurs, the ToString() method of everything being concatenated is called implicitly. Thats why it is legal.

oh ok, thanks.

the normal way to convert an int to string would be

int x = 1;
string y;
y = x.ToString(); // explicit conversion

or

//comments go after the double slashes

int x = 1;
string y;
y = "" + x; // this is called implicit conversion.

the other way around:

string x = "1";
int y = int.Parse(x);

was that what you meant ?

greetings

VB with Option Strict On is stricter about some things than C#.
C# is stricter about some things than VB with Option Strict On.

i.e., VB with Option Strict On and C# are not identically strict.