C sharp中如何调用C++编写的DLL

WPF大行其道，开发用户界面确实非常方便。有时候需要调用很多以前用C++编写的DLL库，这就涉及到C sharp 中如何调用C++编写的DLL的问题。一番尝试之后，发现调用其实比较简单。步骤记录如下：

1：本例中DLL名称为：Test.dll，提供的接口函数也很简单：两数相加返回和值(int AddFunc(int a, int b))

将DLL拷贝到exe将要生成的文件夹下。

2：C sharp 代码中记得添加using System.Runtime.InteropServices（否则的话，使用后文中提到的[DllImport("Test.dll")]时将会提示：The type oro namespace name'DllImport' could not be found的错误信息

3：Wpf 测试代码如下，点击Test按钮之后，进入Button_Click_Test（）函数，单步调试发现TestValue 为8，说明DLL调用成功了。

[csharp]
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.Runtime.InteropServices;    //添加


namespace WpfApplication
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        [DllImport("Test.dll")]                       //载入Test.dll
        public static extern AddFunc(int a, int b);   //引出DLL提供的接口函数之后，就可以直接调用了。
        private void Button_Click_Test(object sender, RoutedEventArgs e)
        {
            int TestValue = 0;

            TestValue = AddFunc(3, 5);

            return;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.Runtime.InteropServices; //添加

namespace WpfApplication
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        [DllImport("Test.dll")]                       //载入Test.dll
        public static extern AddFunc(int a, int b);   //引出DLL提供的接口函数之后，就可以直接调用了。
        private void Button_Click_Test(object sender, RoutedEventArgs e)
        {
            int TestValue = 0;

TestValue = AddFunc(3, 5);

            return;
        }
    }
}

补充：软件开发 , C# ,