C# shorthand for if not null then assign value

C# shorthand for if not null then assign value

In C#, you can use the null-conditional operator (?.) and the null-coalescing operator (??) to assign a value if a variable is not null. Here's an example:

string myString = null; string myOtherString = myString?.ToUpper() ?? "Default value";

In this example, the ?. operator checks if myString is null, and if it's not, calls the ToUpper method on it. If myString is null, the entire expression evaluates to null. The ?? operator then checks if the expression is null, and if it is, assigns the default value "Default value" to myOtherString.

This code is equivalent to the following if statement:

string myString = null; string myOtherString; if (myString != null) { myOtherString = myString.ToUpper(); } else { myOtherString = "Default value"; }

Using the shorthand version with the null-conditional operator and the null-coalescing operator can make your code more concise and easier to read.

Examples

  1. "C# shorthand for if not null then assign value"

    • Code:
      // Original code if (someObject != null) { variable = someObject.Value; } // Shorthand using null-conditional operator variable = someObject?.Value;
    • Description: Introduces the null-conditional operator (?.) as a shorthand for checking if an object is not null before assigning a value.

  2. "C# null-conditional operator with default value"

    • Code:
      // Original code if (someObject != null) { variable = someObject.Value; } else { variable = defaultValue; } // Shorthand using null-conditional operator and null-coalescing operator variable = someObject?.Value ?? defaultValue;
    • Description: Uses the null-conditional operator in combination with the null-coalescing operator (??) to provide a default value if the object is null.

  3. "C# shorthand for if not null then assign different values"

    • Code:
      // Original code if (someObject != null) { variable = someObject.Value; } else { variable = defaultValue; } // Shorthand using null-conditional operator and null-coalescing operator variable = someObject?.Value ?? defaultValue;
    • Description: Demonstrates how the shorthand can be adapted to assign different values based on whether the object is null or not.

  4. "C# shorthand for if not null then assign result of a method"

    • Code:
      // Original code if (someObject != null) { variable = GetValueFromObject(someObject); } // Shorthand using null-conditional operator variable = someObject?.GetValueFromObject();
    • Description: Applies the null-conditional operator to invoke a method if the object is not null.

  5. "C# shorthand for if not null then assign value or throw exception"

    • Code:
      // Original code if (someObject != null) { variable = someObject.Value; } else { throw new ArgumentNullException(nameof(someObject)); } // Shorthand using null-conditional operator and null-coalescing operator variable = someObject?.Value ?? throw new ArgumentNullException(nameof(someObject));
    • Description: Utilizes the null-conditional and null-coalescing operators to assign a value or throw an exception if the object is null.

  6. "C# shorthand for if not null then assign value with side effect"

    • Code:
      // Original code if (someObject != null) { variable = someObject.Value; PerformSideEffect(); } // Shorthand using null-conditional operator and null-coalescing operator variable = someObject?.Value; PerformSideEffect();
    • Description: Highlights that the shorthand can simplify code, but extra care is needed if there's a side effect.

  7. "C# shorthand for if not null then assign value in LINQ"

    • Code:
      // Original code var result = list.Where(x => x != null).Select(x => x.Value).FirstOrDefault(); // Shorthand using null-conditional operator var result = list.Select(x => x?.Value).FirstOrDefault();
    • Description: Demonstrates using the null-conditional operator in LINQ to filter and select values from a list.

  8. "C# shorthand for if not null then assign value in property"

    • Code:
      // Original code private int _myProperty; public int MyProperty { get { if (_someObject != null) { return _someObject.Value; } return _myProperty; } } // Shorthand using null-conditional operator public int MyProperty => _someObject?.Value ?? _myProperty;
    • Description: Adapts the shorthand for property getters, reducing boilerplate code.

  9. "C# shorthand for if not null then assign value in switch statement"

    • Code:
      // Original code int result; switch (someObject) { case SomeType obj: result = obj.Value; break; default: result = defaultValue; break; } // Shorthand using null-conditional operator and null-coalescing operator result = (someObject as SomeType)?.Value ?? defaultValue;
    • Description: Applies the shorthand within a switch statement to handle different cases.

  10. "C# shorthand for if not null then assign value with multiple conditions"

    • Code:
      // Original code if (someObject != null && someObject.IsValid()) { variable = someObject.Value; } // Shorthand using null-conditional operator and null-coalescing operator variable = someObject?.IsValid() == true ? someObject.Value : defaultValue;
    • Description: Combines multiple conditions with the null-conditional and null-coalescing operators for a concise shorthand.

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