Using Declared Variable Outside A Selection (IF)

Question

1.00/5 (1 vote)

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Hi
Basically i have a if loop selection, and i have defined a variable in it, however in the else i wish to use it aswell, but i cant does anyone have any suggestions how i can do this please.

SQL

if (Selection)
{
String Name = "Hello";
}
Else
{
Name;
}

Above is what i wish to happen something like that bu it wont let me use the variable "Name" any suggestions please.

Posted 9-Dec-13 7:24am

Member 9665875

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4 solutions

Solution 1

C#

String Name = string.Empty;

if (Selection)
{
Name = "Hello";
}
Else
{
Name = "Another value";
}

Posted 9-Dec-13 7:30am

Jean-Claude ADIBA

Solution 3

The only problem is the locality of definition: your declaration of Name is accessible only in its block's scope. If you didn't use curly brackets, even the declaration would cause compilation error. The resolution would look like

C#

string name = null; // or something else, but some initialization is absolutely required
if (Selection)
   name = "Hello";
else
   name = "something else";

You need to read on locality and scope topics before moving any further. Nearly any C# manual would include this topic.

Good luck,

—SA

Posted 9-Dec-13 7:36am

Sergey Alexandrovich Kryukov

Updated 9-Dec-13 10:02am

v2

Comments

CPallini 10-Dec-13 1:33am

5.

Sergey Alexandrovich Kryukov 10-Dec-13 1:45am

Thank you, Carlo.
—SA

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Adam Zgagacz · Accepted Answer · 2013-12-09T07:31:00

Solution 2

Just declare your varable outside of if block.

C#

String Name;
if (Selection)
{
Name = "Hello";
}
else
{
Name="Something else";
}

Posted 9-Dec-13 7:31am

Adam Zgagacz

v2

Comments

Member 9665875 9-Dec-13 13:40pm

your the master, with a plan :)

CPallini · Accepted Answer · 2013-12-09T07:45:00

Solution 4

The other solutions provided a way to fix your code. You might be also interested in the reason that happens. Have a look, for instance to "The Scope and Lifetime of Variables in C sharp"[^].

Posted 9-Dec-13 7:45am

CPallini

Comments

Maciej Los 9-Dec-13 16:00pm

Good point!
+5, Carlo!

CPallini 9-Dec-13 16:19pm

Thank you.

Sergey Alexandrovich Kryukov 9-Dec-13 18:27pm

Short informative one, a 5.
(I tried to give OP a chance to find the topic in some manual independently, but you nearly failed me. :-)
—SA

CPallini 10-Dec-13 1:33am

Thank you, Sergey.

Joezer BH 10-Dec-13 1:59am

5ed!

CPallini 10-Dec-13 3:04am

Thank you.