結構用法
使用建構函式:
Vector v1 = new Vector();
v1.X = 1;
v1.Y = 2;
v1.Z = 3;
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z);
// Output X=1,Y=2,Z=3
Vector v1 = new Vector();
//v1.X is not assigned
v1.Y = 2;
v1.Z = 3;
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z);
// Output X=0,Y=2,Z=3
Point point1 = new Point();
point1.x = 0.5;
point1.y = 0.6;
Point point2 = new Point(0.5, 0.6);
沒有建構函式:
Vector v1;
v1.Y = 2;
v1.Z = 3;
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z);
//Output ERROR "Use of possibly unassigned field 'X'
Vector v1;
v1.X = 1;
v1.Y = 2;
v1.Z = 3;
Console.WriteLine("X = {0}, Y = {1}, Z = {2}",v1.X,v1.Y,v1.Z);
// Output X=1,Y=2,Z=3
Point point3;
point3.x = 0.5;
point3.y = 0.6;
如果我們使用帶有建構函式的結構,我們就不會遇到未分配欄位的問題(每個未分配的欄位都有空值)。
與類不同,不必構造結構,即不需要使用 new 關鍵字,除非你需要呼叫其中一個建構函式。結構不需要 new 關鍵字,因為它是值型別,因此不能為 null。