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The ? operator (null coalescing operator) in C# is used to provide an alternative value when a variable may be null. The syntax is variableName ?? defaultValue, if variableName is not null, its value is returned, otherwise an alternative value is returned. It provides the advantages of simplicity, readability, and avoidance of null pointer exceptions.
?
in C# Operator
in C# The ## operator, also known as the null coalescing operator or the ternary conditional operator, is a concise syntax for providing an alternate value in cases where a variable might be
null.
Syntax and usage
? The format of operator usage is:
<code class="csharp">variableName ?? defaultValue;</code>where:
is the variable to check.
is the null coalescing operator.
is the fallback value returned if
variableName is
null.
variableName is not
null, its value is returned. Otherwise,
defaultValue is returned.
Example
The following code demonstrates the use of the? operator:
<code class="csharp">string name = null; // 使用 ? 运算符提供备用值 string result = name ?? "Unknown"; Console.WriteLine(result); // 输出 "Unknown"</code>
Advantages
Advantages of using the? operator include:
variables to avoid lengthy if-else statements.
before accessing it.
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