C# 4 and .NET 4

38 ❘ ChaPTer 2 cOre c#
If more than one statement is to be executed as part of either condition, these statements need to be joined
together into a block using curly braces ({.}). (This also applies to other C# constructs where statements
can be joined into a block, such as the for and while loops):
bool isZero;
if (i == 0)
{
isZero = true;
Console.WriteLine("i is Zero");
}
else
{
isZero = false;
Console.WriteLine("i is Non-zero");
}
If you want to, you can use an if statement without a final else statement. You can also combine else if
clauses to test for multiple conditions:
using System;
namespace Wrox
{
class MainEntryPoint
{
static void Main(string[] args)
{
Console.WriteLine("Type in a string");
string input;
input = Console.ReadLine();
if (input == "")
{
Console.WriteLine("You typed in an empty string.");
}
else if (input.Length < 5)
{
Console.WriteLine("The string had less than 5 characters.");
}
else if (input.Length < 10)
{
Console.WriteLine("The string had at least 5 but less than 10
Characters.");
}
Console.WriteLine("The string was " + input);
}
}
There is no limit to how many else ifs you can add to an if clause.
code snippet ElseIf.cs
You’ll notice that the previous example declares a string variable called input, gets the user to enter text at
the command line, feeds this into input, and then tests the length of this string variable. The code also shows
how easy string manipulation can be in C#. To find the length of input, for example, use input.Length.
One point to note about if is that you don’t need to use the braces if there’s only one statement in the
conditional branch:
if (i == 0) Let's add some brackets here.
Console.WriteLine("i is Zero"); // This will only execute if i == 0
Console.WriteLine("i can be anything"); // Will execute whatever the
// value of i
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