谁帮忙将delphi程序段翻译成C#

unit DllExport;

interface

uses
  windows, SysUtils;


type
  TKzString = packed record
  returnlength: byte; //?????
  returnstring: array[0..255] of char;
  end;

  TReturnParam = packed record
  lx: byte; //命令类型
  mon: integer; //监视器号
  cam: integer; //摄像头号
  controlindex: integer; //镜头控制类型
  Runtime: integer; //镜头控制时间，0为直至收到下一个控制命令，其它为动多长时间
  param1, param2, param3, Param4: integer; //镜头控制的参数
  end;
  //lx=1 选取mon,
  //lx=2 选取Cam
  //lx=3 将Cam切至MON
  //lx=4 镜头控掉


//矩阵库命令
function GetVideoMatrix(site, mon, cam, keyid: integer; var kzString: TkzString): boolean; stdcall; //
  //得到矩阵切换命令
  //输入 mon,cam 监视器号和镜头号
  //keyID键盘ID号
  //输出 kzstring,不超过255

function GetAudioMatrix(site, mon, cam, keyid: integer; var kzString: TkzString): boolean; stdcall;
function NeedGetMonitor(): boolean; stdcall;
function GetMonitor(site, mon,cam, keyid: integer; var kzString: TkzString): boolean; stdcall;
function GetControlCode(site,mon, cam, controlindex, param1, param2, param3, Param4, keyid: integer; var sendnostop: Boolean; var ConTime: Integer; var kzString