] in the C# attribute or method, the meaning of the operator

=> operator plays an important role in defining expression body members, which is a syntactic sugar feature introduced in C# 6. These members provide a concise syntax for getter methods in properties.

Expression body attribute]

=> operator in the property declaration creates an expression body member. This means that the compiler will automatically generate a getter method whose return value is the expression to the right of the arrow.

public int MaxHealth => Memory[Address].IsValid ? Memory[Address].Read(Offs.Life.MaxHp) : 0;

If
• Memory[Address].IsValid is true, return Memory[Address].Read(Offs.Life.MaxHp)]
]]
• If Memory[Address].IsValid is false, return 0

Difference between field initialization

Unlike expression body properties, field declarations with initializers evaluate their expressions only at one time during type instantiation. For example:

public int MaxHealth = x ? y : z;

This code declares a field whose value is determined by the ternary conditional operator, which is evaluated only when the type is instantiated.

Other expression body members

Expression body members are not limited to attributes. They can also be used for:

• Indexer
• method
• operator
• Constructor (added in C# 7.0)
• Terminator (added in C# 7.0)

However, they cannot be used for nested types, events, or fields.

Difference between Lambda Expressions

While expression body members have similarities to lambda expressions, they are different concepts. The lambda expression produces a delegate instance or expression tree, and the expression body member is a directive for the compiler to generate a specific member implementation behind the scenes.

=>The existence of the operator is mainly used to distinguish expression body members from other C# 6 functions.