What are the commonly used operators in C#?

Commonly used operators in C# include: conditional operator, as operator for forced conversion, is operator to determine whether a variable is of a specific type, typeof operator to return the calss type and sizeof operator to return the value type required on the stack. The length

C# language provides many operators. These operators can help us perform mathematical operations, indexing or function calls in expressions. Next, we will introduce several in detail in the article. Commonly used operators have certain reference value. I hope it will be helpful to everyone

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Commonly used operators in C# include conditional operators, is operators, as operators, typeof operators, etc. In the following article, we will introduce the use of each operator in detail

Conditional operator

The conditional operator is represented by (?:)

condition ? X:Y

The above statement means if the condition is true? then it is X: otherwise it is Y

The conditional operator can be called the ternary operator, which is the simplified form of if..else. First, a condition is judged. If the condition is true, the first value is returned, otherwise the second value is returned. Appropriate use of the ternary operator can make the program more concise.

The as operator represents forced conversion, and no exception will be thrown even if the conversion fails. Need to pay attention to the following two issues

(1) It can only be used for reference types

(2) When the conversion is unsuccessful, null value is returned

Example:

object a = "str";
object b = 5;
string c = a as string;//返回的是string
string d = b as string;//返回的是null

is operator is used to determine whether a variable is of a specific type or is derived from that type. If so, it returns true, otherwise it returns false

Example:

int a=1;
bool type = a is long;

returns false because int is not long type and is not derived from long

The typeof operator is used to return the type of class and can also be used for open generic types. Types with multiple type parameters must have the appropriate number of commas in the specification.

Type a = typeof(AAA);
AAA aa = new AAA();
Type b = aa.GetType()

Note: typeof and GetType() have the same effect, the difference is that the parameters of typeof are types, and the parameters of GetType() are type variables

sizeof operator is used to return the required length of the value type in the stack (unit: bytes)

int a = sizeof(int); // 4

int is 32 bits, occupies 4 bytes, 1 word The section is 8 bits

Note: sizeof is generally used to obtain the number of bytes occupied by basic types (integers, floating point numbers, character types, Boolean types)

Summary: The above is this article That’s all, I hope it’s helpful to everyone.

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