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public string Source { get { /* if ( Source == null ){ return string . Empty; } else { return Source; } */ return Source ?? string.Empty; } set { /* if ( Source == null ) { Source = string . Empty; } else { if ( Source == value ) { Source = Source; } else { Source = value; } } */ Source == value ? Source : value ?? string.Empty; RaisePropertyChanged ( "Source" ); } } Can I use ?: ?? operators EXACTLY as If/Else?
My Question :
How to write the following with ?: ?? operators
[ 1 ]
if ( Source == null ){ // Return Nothing } else { return Source; } [ 2 ]
if ( Source == value ){ // Do Nothing } else { Source = value; RaisePropertyChanged ( "Source" ); } Briefly : How to do nothing, return nothing and do multiple instructions with ?: ?? operator?
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The conditional operator – also known as the ternary operator – is an alternative form of the if/else statement that helps you to write conditional code blocks in a more concise way. First, you need to write a conditional expression that evaluates into either true or false .
The ternary operator is a way of writing conditional statements in Python. As the name ternary suggests, this Python operator consists of three operands. The ternary operator can be thought of as a simplified, one-line version of the if-else statement to test a condition.
The ternary conditional operator ?: allows us to define expressions in Java. It's a condensed form of the if-else statement that also returns a value.
The conditional operator (? :) is a ternary operator (it takes three operands).
For [1], you can't: these operators are made to return a value, not perform operations.
The expression
a ? b : c evaluates to b if a is true and evaluates to c if a is false.
The expression
b ?? c evaluates to b if b is not null and evaluates to c if b is null.
If you write
return a ? b : c; or
return b ?? c; they will always return something.
For [2], you can write a function that returns the right value that performs your "multiple operations", but that's probably worse than just using if/else.
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The ternary operator (?:) is not designed for control flow, it's only designed for conditional assignment. If you need to control the flow of your program, use a control structure, such as if/else.
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