C# |返回对象的方法
原文:https://www . geeksforgeeks . org/c-sharp-method-returning-a-object/
在 C# 中,方法可以返回任何类型的数据,包括对象。换句话说,允许方法返回对象而没有任何编译时错误。
例 1:
// C# program to illustrate the concept
// of the method returning an object
using System;
class Example {
// Private data member
private string str;
// Method to set the value of str
public void setdata(string s)
{
str = s;
}
// Method to display the value of str
public void Display()
{
Console.WriteLine("String is: " + str);
}
// Method that return object
public Example Astr(Example ex)
{
// Creating object of Example
Example obj = new Example();
// Adding the value of passed
// an object in the current object
// and adding the sum in another object
obj.str = str + ex.str;
// Returning the object
return obj;
}
}
// Driver Class
class GFG {
// Main method
static void Main()
{
// Declaring objects of Example
Example o1 = new Example();
Example o2 = new Example();
// Initialize the values to the objects
o1.setdata("Geeks");
o2.setdata("forGeeks");
// Adding value of both objects
// and the result will be
// assigned into third object
Example o3 = o1.Astr(o2);
// Display the data
o1.Display();
o2.Display();
o3.Display();
}
}
输出:
String is: Geeks
String is: forGeeks
String is: GeeksforGeeks
说明:在上例中,我们有一个类名为例。示例类包含 setdata() 方法,用于设置 str 的值, Display() 方法用于显示 str 的值, Astr() 用于将当前对象中传递的对象的值相加,并将另一个对象中的和相加。在 Main 方法中,创建了示例类的三个对象 o1 、 o2 和 o3 。在本陈述中,示例 o3 = o1。astr(O2);将 o1 和 o2 对象的值相加,结果赋入 o3 对象。
例 2:
// C# program to illustrate the
// concept that how method returns
// an object
using System;
class Triangle {
// Data member of class
int Base;
int Height;
// Constructor of class
public Triangle(int b, int h)
{
Base = b;
Height = h;
}
// Method return area of triangle
public int Area()
{
return ((Base * Height) / 2);
}
// Method display the dimension of triangle
public void Display()
{
Console.WriteLine("\nBase of the triangle is: "
+ Base + "\nHeight of the triangle is: "
+ Height);
}
public Triangle newdimension(int d)
{
return new Triangle(Base * d, Height * d);
}
}
class GFG {
// Main method
public static void Main()
{
// Creating and initializing object
Triangle t1 = new Triangle(2, 8);
// Display the dimensions and area of triangle
Console.Write("Dimensions of Triangle is: ");
t1.Display();
Console.Write("Area of Triangle is: {0}", t1.Area());
Console.WriteLine();
Console.WriteLine();
Triangle t2 = t1.newdimension(2);
Console.Write("New Dimensions of Triangle is: ");
t2.Display();
Console.Write("New area of Triangle is: {0}", t2.Area());
}
}
输出:
Dimensions of Triangle is:
Base of the triangle is: 2
Height of the triangle is: 8
Area of Triangle is: 8
New Dimensions of Triangle is:
Base of the triangle is: 4
Height of the triangle is: 16
New area of Triangle is: 32
说明:在上例中,我们有一个类被命名为三角。三角形类包含构造函数三角形(),方法面积()求三角形面积,方法显示()显示三角形尺寸,方法 newdimension() 提供三角形新尺寸。维度的值由对象返回。现在在 Main 方法中有两个对象名为 t1 和 t2 。在本陈述中三角形 T2 = t1 . new dimension(2);,将上一个维度,即三角形的 2 和 8 放大 2,结果赋给 t2 对象。
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