C# Winform应用程序与C#写的DLL间结构的传递

Question

   用C#写了个WINFORM应用程序，用C#写了个DLL，现在需要往DLL里传递结构，怎么弄?请各位大侠帮帮忙！

Answer 1

把“结构”定义在dll里面，winform去调用它就行了。

Answer 2

c#winform:        StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public class mn
        {
           [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
            public string a;
        }
C# dll:
       [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
        public class mn
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 40)]
            public String a;
        }
       
        public static string GetData(ref mn m_gb1)
        {
            try
            {             
                
                return "a";                
            }
            catch
            {
                return "";
            }
        }在C#winform中传递结构:
                        mn k;
                        k.a = "aaa";
                         
                        Cems_Deal.Cems_Deal a = new Cems_Deal.Cems_Deal();
                        
                        string str=a.GetData(k);
错误提示：
错误 1 与“Cems_Deal.Cems_Deal.GetData(ref Cems_Deal.Cems_Deal.mn)”最匹配的重载方法具有一些无效参数 D:\Program\StepRtu2010\StepRtu2010\DealDataThread.cs
错误 2 参数“1”: 无法从“StepRtu2010.PublicVar.mn”转换为“ref Cems_Deal.Cems_Deal.mn” D:\Program\StepRtu2010\StepRtu2010\DealDataThread.cs