在大型项目的开发过程中，需要多人协同工作，来加速项目完成进度。
比如一个软件有100个form，分给100个人来写，每个人完成自己的Form.cs的编写之后，要在Mainform调用自己写的Form。
如果按照正常的Form form1 = new Form()这种写法来构造窗口的话，相当于每个人都要改动Mainform.cs文件，这100个人只要有1个人在Mainform中改错代码了，那么该项目就在至关重要的Mainform.cs里埋下了1个bug，这是非常危险的一件事！
所以为了降低编码的耦合性，让每个人只要关心自己的类，不用关心mainform相关的代码，可以用特性加反射的方式来提高程序的健壮性。下面就是一个例子：
BaseForm.cs代码如下：
using System;
using System.Windows.Forms;namespace WinFormsApp1
{public enum CusFormType{HomePage, // 主页UserInfoPage, // 员工信息页LogPage, // 日志页SettingPage, // 系统设置页}public partial class BaseForm : Form{public BaseForm() { }public BaseForm(object par, Func<CusFormType, object, ActionType, BaseForm> func){param = par;Func = func;}public object param;public Func<CusFormType, object, ActionType, BaseForm> Func { get; set; }public class FormTypeAttribute : Attribute{public CusFormType[] tableType;public FormTypeAttribute(params CusFormType[] types) //构造函数{tableType = types;}}}
}
MainForm.cs代码如下：
//#define HAHA
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Windows.Forms;
using static WinFormsApp1.BaseForm;namespace WinFormsApp1
{ public enum ActionType{New,Refresh}public partial class Mainform : Form{Func<CusFormType, object, ActionType, BaseForm> operFunc => FormOper;//Lambda 表达式是与匿名方法类似的内联表达式，但更加灵活；public Mainform(){InitializeComponent();GetTableTypeDic();}public static Dictionary<CusFormType, Type> tableTypeDic = new Dictionary<CusFormType, Type>();private void GetTableTypeDic(){var baseType = typeof(BaseForm);var allTypes = this.GetType().Assembly.GetTypes().Where(p => !p.IsInterface && baseType.IsAssignableFrom(p)).ToList();//通过反射获取所有继承自BaseForm的类的typeforeach (var item in allTypes){var attrs = item.GetCustomAttributes(typeof(FormTypeAttribute), false);//在派生类中重写时，返回应用于此成员并由System.type标识的自定义属性数组foreach (var attr in attrs){var curAttr = attr as FormTypeAttribute;if (curAttr.tableType != null){foreach (var type in curAttr.tableType)tableTypeDic[type] = item;}}}}private BaseForm FormOper(CusFormType tableType, object par, ActionType actionType = ActionType.New){if (tableTypeDic.ContainsKey(tableType)){if (actionType == ActionType.New){BaseForm tableForm = null;{tableForm = Activator.CreateInstance(tableTypeDic[tableType], new object[] { par, operFunc }) as BaseForm;tableForm.Text = tableType.ToString();}tableForm.Show();return tableForm;}}return null;}private void button1_Click(object sender, EventArgs e){operFunc.Invoke(CusFormType.HomePage, null,ActionType.New);}}
}
Form1代码如下：
using System;namespace WinFormsApp1
{[FormTypeAttribute(CusFormType.HomePage)]public partial class Form1 : BaseForm{public Form1(object par, Func<CusFormType, object, ActionType, BaseForm> func):base(par,func){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Func.Invoke(CusFormType.LogPage,null,ActionType.New);}}
}
form2代码如下：
using System;namespace WinFormsApp1
{[FormTypeAttribute(CusFormType.LogPage)]public partial class Form2 : BaseForm{public Form2(object par, Func<CusFormType, object, ActionType, BaseForm> func) : base(par, func){InitializeComponent();}private void button1_Click(object sender, EventArgs e){Func.Invoke(CusFormType.SettingPage,null,ActionType.New);}}
}form3代码就不用贴出来了，就是随便新建的一个form。
