variable scope in statement blocks

Question

for (int i = 0; i < 10; i++)
{
    Foo();
}
int i = 10; // error, \'i\' already exists

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for (int i = 0; i < 10; i         


        

Answer 1

Yea, I second the "nanny-state compilerism" comment. What's interesting is that this is ok.

for (int i = 0; i < 10; i++)
{

}

for (int i = 0; i < 10; i++)
{

}

and this is ok

for (int i = 0; i < 10; i++)
{

}

for (int j = 0; j < 10; j++)
{
    var i = 12;                
}

but this is not

for (int i = 0; i < 10; i++)
{
    var x = 2;
}

var x = 5;

even though you can do this

for (int i = 0; i < 10; i++)
{
    var k = 12;
}

for (int i = 0; i < 10; i++)
{
    var k = 13;
}

It's all a little inconsistent.

EDIT

Based on the comment exchange with Eric below, I thought it might be helpful to show how I try to handle loops. I try to compose loops into their own method whenever possible. I do this because it promotes readability.

BEFORE

/*
 * doing two different things with the same name is unclear
 */
for (var index = 0; index < people.Count; index++)
{
    people[index].Email = null;
}
var index = GetIndexForSomethingElse(); 

AFTER

/*
 * Now there is only one meaning for index in this scope
 */
ClearEmailAddressesFor(people); // the method name works like a comment now
var index = GetIndexForSomethingElse();

/*
 * Now index has a single meaning in the scope of this method.
 */
private void ClearEmailAddressesFor(IList people)
{
    for (var index = 0; index < people.Count; index++)
    {
        people[index].Email = null;
    }
}