封装dll

首先创建 .Net平台 类库

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace _09.Encapsulation_dll
{public class Program{/// <summary>/// 求两个double类型的数值的和/// </summary>/// <param name="x">加数</param>/// <param name="y">加数</param>/// <returns>和</returns>public double mathAdd(double x,double y){return x + y;}}
}

 

调用dll

先创建一个Winform控件，引用我们上面创建的类库

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using _09;
using _09.Encapsulation_dll;namespace _09.Invoke_dll
{public partial class Form1 : Form{public Form1(){InitializeComponent();}private void btn_mathAdd_Click(object sender, EventArgs e){Class1 mathadd = new Class1();double sum=mathadd.mathAdd(4, 11);MessageBox.Show(sum.ToString(), "Surprise !");}}
}