string类型函数 bcb做dll,c#调用

C#:

using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace ConsoleApplication1
{
class Program
{
[DllImport("C:\test.dll")]

public static extern StringBuilder _importStr(String str1);

static void Main(string[] args)
{
Console.WriteLine(_importStr("hello world1").ToString());
}
}
}