extern外部方法使用C#簡單例子

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外部方法使用C#簡單例子

1、增加引用using System.Runtime.InteropServices;

2、聲明和實現的串連[DllImport("kernel32", SetLastError = true)]

3、聲明外部方法public static extern int GetCurrentDirectory(int a, StringBuilder b);

4、對外部方法操作  GetCurrentDirectory(300, pathstring);

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Runtime.InteropServices;//引用外部namespace extern{    public partial class DllImportForm : Form    {        public DllImportForm()        {            InitializeComponent();        }        [DllImport("kernel32", SetLastError = true)]//聲明和實現的串連        public static extern int GetCurrentDirectory(int a, StringBuilder b);//外部方法               private void btnDisplay_Click(object sender, EventArgs e)        {            StringBuilder pathstring=new StringBuilder ();//返迴路徑            GetCurrentDirectory(300, pathstring);           this.listBox1.Items.Add (pathstring );        }    }}

extern外部方法使用C#簡單例子