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When you create a struct object using the new operator, it gets created and the appropriate constructor is called. Unlike classes, structs can be instantiated without using the new operator. If you do not use new, the fields will remain unassigned and the object cannot be used until all of the fields are initialized.
An initializer for a structure is a brace-enclosed comma-separated list of values, and for a union, a brace-enclosed single value. The initializer is preceded by an equal sign ( = ).
Structure members cannot be initialized with declaration.
2 ways to create and initialize a new structThe new keyword can be used to create a new struct. It returns a pointer to the newly created struct. You can also create and initialize a struct with a struct literal. An element list that contains keys does not need to have an element for each struct field.
I have two similar structs in C#, each one holds an integer, but the latter has get/set accessors implemented.
Why do I have to initialize the Y struct with new operator prior to assigning the a field? Is y still a value type when I init it with new?
public struct X
{
public int a;
}
public struct Y
{
public int a { get; set; }
}
class Program
{
static void Main(string[] args)
{
X x;
x.a = 1;
Y y;
y.a = 2; // << compile error "unused local variable" here
Y y2 = new Y();
y2.a = 3;
}
}
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