如何实现自定义命令行&执行 [英] How to implement custom command line & execution
问题描述
我正在尝试为我的应用程序构建一个自定义命令行，我有几个基本命令，我只是使用一堆if"语句来检查命令是什么.目前它看起来像这样
public void ExecuteCommand(){字符串输入 = ReadLine();//从输入中获取最后一个字符串布尔 isDone = false;//需要bool来检查命令是否执行，默认为false.匹配结果 = Regex.Match(input, @"([^s]+)");//获取命令名字符串 commandName = result.Value.ToLower();字符串值 = Regex.Match(输入，@"s(.*)").Value;//获取它的参数.目前在 ' ' 空格之后的所有内容.if (commandName == "close"){关闭();isDone = true;}//所以命令行是单独的窗口，appendedForm是主窗体.在其中执行一些功能.if (commandName == "exit"){appendedForm.Close();}if (commandName == "spoof"){appendedForm.Fn_Spoof();isDone = true;}if(commandName == "spoofstop"){appendedForm.Fn_StopCapture();isDone = true;}如果(命令名 == 扫描"){appendedForm.Fn_Scan();isDone = true;}如果(命令名 == 清除"){输出.文本 = "";WriteLine("控制台已清空.缓存为空.");//data_lines.Clear();isDone = true;}...}基本上就是这样.我有一个 mainForm 和命令行表单.字符串输入被输入到命令行，然后我检查命令的名称并从 mainForm 执行一些函数.
我的问题是，实现此类事情的最佳方式是什么?我当然可以继续写一堆如果"，但有些事情告诉我，这不是最好的方法.
我想过创建命令"类
公共类命令{公共字符串名称；公共字符串描述；公共布尔具有参数；命令(){}}并将所有命令存储在某种数组中，但我不确定如何使用它从 mainForm 调用函数.
欢迎提出任何想法！
你可以把所有的命令塞进一个Dictionary;如果您可以接受所有具有相同返回类型的命令.
我已经使用了字符串并设置了一些命令.
我使用 params 关键字来避免每次调用时出现丑陋的 new object[].
您仍然需要转换参数，除非您可以将它们全部设为一种类型.(这实际上可能不是一个坏主意，因为它们都来自输入字符串..)
这是一个例子:
公共委托字符串 cmdDel(params object[] args);字典<字符串，cmdDel>cmd = 新字典<字符串，cmdDel>();添加几个函数:
cmd.Add("clear", cmd_clear);cmd.Add("退出", cmd_exit);cmd.Add("添加", cmd_add);cmd.Add("日志", cmd_log);有了这些身体:
公共字符串 cmd_clear(params object[] args){返回清除"；}公共字符串 cmd_exit(参数对象 [] 参数){返回退出"；}公共字符串 cmd_add(params object[] args){返回 ((int)args[0] + (int)args[1]).ToString();}公共字符串 cmd_log(参数对象 [] 参数){StringBuilder 日志 = new StringBuilder();foreach (args 中的对象 a) log.Append(a.ToString() + " ");返回 log.ToString();}并测试:
Console.WriteLine(cmd["clear"]());Console.WriteLine(cmd["add"](23, 42));Console.WriteLine(cmd["log"]( 23, "+" + 42, "=", cmd["add"]( 23, 42) ));Console.WriteLine(cmd["exit"]());<块引用>
清除
65
23 + 42 = 65
退出
当然，您仍然需要(至少)使用与命令一样多的行进行设置.并且还需要进行类似数量的错误检查.
但是命令处理部分可以变得非常简单.
I'm trying to build a custom commandline for my app, i have several basic commands, and i simply use bunch of "if" statements to check what the command is. currently it looks something like this
public void ExecuteCommand()
{
string input = ReadLine(); //gets last string from input
bool isDone = false; //need bool to check whether command was executed or no, by default false.
Match result = Regex.Match(input, @"([^s]+)"); //to get command name
string commandName = result.Value.ToLower();
string value = Regex.Match(input, @"s(.*)").Value; //to get its parameter. currently everything after ' ' space.
if (commandName == "close")
{
Close(); isDone = true;
}
//so commandline is separate window, and appendedForm is a main form. in which some functions are executed.
if (commandName == "exit")
{
appendedForm.Close();
}
if (commandName == "spoof")
{
appendedForm.Fn_Spoof();
isDone = true;
}
if(commandName == "spoofstop")
{
appendedForm.Fn_StopCapture();
isDone = true;
}
if(commandName == "scan")
{
appendedForm.Fn_Scan(); isDone = true;
}
if(commandName == "clear")
{
output.Text = "";
WriteLine("Console cleared. Cache is empty.");
//data_lines.Clear();
isDone = true;
}
...
}
So that's basically it. I have a mainForm, and commandline form. string input is typed into commandline, then I check the name of command and execute some function from mainForm.
My question is, what is the best way of implementing such kind of thing? I surely can just continue writing bunch of "if"s, but something tells me that it's not the best way to make it.
I've thought of creating class "Command"
public class Command
{
public string name;
public string description;
public bool hasParameter;
Command()
{
}
}
And storing all commands in some sort of array, but I am not sure how would I use this to call a function from mainForm.
Any ideas are welcome!
You could stuff all commands into a Dictionary<string, someDelegate>; if you can live with all commands having the same return type.
I have used string and set up a few commands.
I make use of the params keyword to avoid the ugly new object[] on each call.
You still need to cast the arguments, unless you can make them all one type. (Which may actually be not such a bad idea, as they all come from an input string..)
Here is an example:
public delegate string cmdDel(params object[] args);
Dictionary<string, cmdDel> cmd = new Dictionary<string, cmdDel>();
Add a few functions:
cmd.Add("clear", cmd_clear);
cmd.Add("exit", cmd_exit);
cmd.Add("add", cmd_add);
cmd.Add("log", cmd_log);
With these bodies:
public string cmd_clear(params object[] args)
{
return "cleared";
}
public string cmd_exit(params object[] args)
{
return "exit";
}
public string cmd_add(params object[] args)
{
return ((int)args[0] + (int)args[1]).ToString();
}
public string cmd_log(params object[] args)
{
StringBuilder log = new StringBuilder();
foreach (object a in args) log.Append(a.ToString() + " ");
return log.ToString();
}
And test:
Console.WriteLine(cmd["clear"]());
Console.WriteLine(cmd["add"]( 23, 42));
Console.WriteLine(cmd["log"]( 23, "+" + 42, "=", cmd["add"]( 23, 42) ));
Console.WriteLine(cmd["exit"]());
cleared
65
23 + 42 = 65
exit
Of course you still need to use (at least) as many lines for setup as you have commands. And also need to do a similar amount of error checking.
But the command processing part can get pretty simple.
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