C# Ternary Operator

C# includes a decision-making operator ? :, called the conditional operator or ternary operator. It is a shorthand for if-Abbreviation of else condition.

Syntax:

condition ? statement　1　: statement　2

The ternary operator starts from a boolean condition. If the value of condition is true, it will execute the statement after ? 1 Statement, otherwise the second statement after : will be executed.

The following example demonstrates the ternary operator.

int x =　20, y =　10;
var result = x > y ? "x大于y" : "x小于y";
Console.WriteLine(result);

x大于y

The condition expression x > y returns true, so the first statement after ? will be executed.

The following statement executes the second statement.

int x =　10, y =　100;
var result = x > y ? "x大于y" : "x小于y";
Console.WriteLine(result);

x小于y

Therefore, the ternary operator is a shorthand for if-else statements. The above example can be rewritten using if-else conditions as follows.

int x =　10, y =　100;
if (x > y){
　　　　Console.WriteLine("x大于y");
}else{
　　　　Console.WriteLine("x小于y");
}

x大于y

Nested ternary operator

Nested ternary operator is implemented by using the condition expression as the second statement.

int x =　10, y =　100;
string result = x > y ? "x大于y": ;　
　　　　　　　　　　　　　　　　　　　　x < y ? "x is less than y" :　
　　　　　　　　　　　　　　　　　　　　　　　　x == y ? "x equals y" : "No result"
Console.WriteLine(result);

The ternary operator is right-associative. The evaluation of the expression a ? b : c ? d : e results in a ? b : (c ? d : e), not (a ? b : c) ? d : e.

var x =　2, y =　10;
var result = x　*　3　y ? x : y > z ? y : z;
Console.WriteLine(result);