c#-Classes and objects

VS Classes and objects

• Static members, static methods

belongs to the class, not to the object, and is called directly by the class instance member to the class itself, that is, the class object itself. Static members belong to all objects, that is, all objects are available. static string Astringstatic getastringlength () {}

• Domain

belongs to the class member generally is private, if is private, the class outside generally uses the domain accesses the string bsring; The constant field. Default static, you must use the initial value setting. const int Anum=1; read-only domain. If it is static, it must be declared with an initial value, and normal must be assigned in the build function. ReadOnly string astring;

• Object contains objects

You can set the field to represent the object and implement the object containing the object. The name of the. Domain name (or attribute name). The name of the containing object. When used, it is necessary to generate the object and the contained object, and then assign the memory address of the contained object to the field of the outer object. Another object that contains another object is that the class contains another class, that is, nested classes, which do so when outside the inner class, using???.

• Property

Domain wrapper, the property gets changed by the domain, the property itself is not saved, saved with the domain. Fields and methods are members of the class private string astring;    Yasring implicitly has the value parameter {get {return astring;    } set {asring =value; }}myclass. yasring = "1"; implicitly invokes the property to assign a value to the private domain

• Method

belongs to a class member

• Function Method overloading

The function method names are the same, the parameters are different, the parameter types are different, the return values can be different.

• Build function

The build function, with the same name as the class, invokes the creation object when creating the object MyClass MyObject = new MyClass (); MyClass () Creates an object, new allocates a memory address, = Saves the new object's measured address to MyObject, MyClass declares the MyObject variable, that is, MyObject holds the memory address of the new object can be =null, cancels the object's reference.

• destructor,

~ Add class Name

• Name space

Used to differentiate between classes of the same name, nested namespaces, which are many-to {} or namespaces. namespaces. Namespaces

• Access restrictions

Public protect available in private class interval class, inside program, derived class available Intereval class, protect class available inside program, derived class available

• Parameter Passing value

The variable value of the calling method is not changed, and the parameter value of the method is copied.

• Parameter Passing Reference

The variable that invokes the method can be changed within the method. A reference to a variable is passed, that is, the memory address is preceded by a ref, and the method is also ref

• Parameter return value

The call statement is added out, the method is also added out, when the need to return multiple values of the method is useful, because the return value of the method is only one.

• Hide

A variable with the same name as the class can be declared within a method, and within a method, the variable defaults to the variable declared by the method, hiding the variable of the class to which the method belongs. In a method that hides a variable, you need to use the this. Variable name, which represents the current object, when a variable of the class being hidden is needed.

• Life cycle

Determines whether the variable has an address in memory during the life cycle. object is not created, it is not in the life cycle, there is no memory address. If the variable is no longer being used, the memory address that is taken up is automatically reclaimed by the garbage collection mechanism.

• Default value

int 0 Character type/0 (character) string Nullbool false object default value NULL

c#-Classes and objects