CC.CodeGenerator.Attribute 1.7.0.617

CC.CodeGenerator

利用.Net的Source Generator功能，生成开发过程中哪些无聊的代码。

优势

• 代码实时生成，无需额外操作，立即生效
• 开发过程中生成的代码，执行性能比运行时反射更有效率

效果演示

视频介绍

https://www.bilibili.com/video/BV1a3411Y7xb?share_source=copy_web

使用方法

1. 安装

安装代码生成包以及支持包

Install-Package CC.CodeGenerator
Install-Package CC.NetCore

因为VS的原因，在添加包引用或者升级包版本后，建议重启VS。

Program.cs中添加全局引用

global using CC.CodeGenerator;

2. 对象Mapping

Mapping

启用对象映射，可指定多个映射对象

MappingIgnore

忽略不需要的属性

[Mapping(typeof(People2Map), typeof(People3Map))]
public partial class People1Map
{
    public Guid PeopleId { get; set; }
    public string UserName { get; set; }
    public string City { get; set; }
    [MappingIgnore]
    public string Disply => $"{UserName}";
}

public class People2Map
{
    public Guid PeopleId { get; set; }
    public string UserName { get; set; }
}

public class People3Map
{
    public string City { get; set; }

}

进行对象之间的赋值

//初始新的Dto
var people1Map = new People1Map() { PeopleId=Guid.NewGuid(),UserName="Tim" };
var people2Map = new People2Map();
var people3Map = new People3Map() { City="ShangHai"};

//复制到对象
people1Map.CopyTo(people2Map);

//从对象复制来
people1Map.CopyFrom(people3Map);

//从别的对象初始化
var people4Map = new People1Map(people2Map);

3. EF检索中Mapping

简化在EF的Select中的无意义赋值代码，并能从多个对象汇获取数据

数据库表关系图

返回的对象增加Mapping特性

[Mapping(typeof(People), typeof(City))]
public partial class PeopleViewDto
{
    public Guid PeopleId { get; set; }
    public string Name { get; set; }
    public string CityTitle { get; set; }
    public List<SkillViewDto> SkillViews { get; set; }
}

[Mapping(typeof(Skill))]
public partial class SkillViewDto
{
    public Guid SkillId { get; set; }
    public Guid PeopleId { get; set; }
}

使用示例

//简化赋值
var PeopleViewDtos1 = context.People
    .Select(x => new PeopleViewDto(x)
        {
            CityTitle = x.City.CityTitle,
            SkillViews = x.Skill.Select(y => new SkillViewDto()
            {
                PeopleId=y.PeopleId,
                SkillId=y.SkillId,
                SkillName=y.SkillName,
            }).ToList()
        })
    .ToList();

//通过级联CopyFrom函数可以从多个实体获得数据
var PeopleViewDtos2 = context.People
    .Select(x => new PeopleViewDto(x)
        {
            SkillViews = x.Skill.Select(y => new SkillViewDto(y)).ToList()
        }
    .CopyFrom(x.City))
    .ToList();

4. 服务注册及依赖注入代码自动创建

Service

自动创建服务注册代码，让Program更加清洁

• LifeCycle:自定义生命周期，默认Scoped

AutoInject

自动创建注入代码

Program.cs中标记注册位置

var builder = WebApplication.CreateBuilder(args);

CC.CodeGenerator.AutoDI.AddServices(builder);//加入此行代码

服务中增加特性

[Service(LifeCycle = ELifeCycle.Singleton)]
public class WeatherForecastService
{
    [AutoInject]
    public DemoService3 DemoService3 { get; }
}

5. 增强数据交换对象及简化EF

Dto

增强实体特性，提供对象赋值，默认增删改查代码

• Context:上下文对象
• Entity:映射的EF实体

Ignore

忽略不需要的属性

示例

[Dto(Context=nameof(DemoaContext),Entity =typeof(People))]
public partial record PeopleDto
{
    public Guid PeopleId { get; set; }
    public string UserName { get; set; }
    public string City { get; set; }
    [DtoIgnore]
    public string Disply => $"{UserName}";
}

示例

var context = new DemoaContext();

//创建Dto
var secondDto = new PeopleDto() { City = "ShangHai" };

//初始新的Dto
var firstDto = PeopleDto.NewGen();

//快速从Dto复制
firstDto.CopyFormDto(secondDto);

//EF快速Select
var peopleEntityDtos = context.People.Where(x=>x.City == "ShangHai").ToPeopleDtos();

//快速载入Dto
var peopleEntityDto = PeopleDto.LoadGen(context, new Guid(""));

//Dto复制到实体
var peopleEntity = context.People.FirstOrDefault();
peopleEntityDto.CopyToEntity(peopleEntity);

//Dto重新载入
peopleEntityDto.ReLoadGen(context);

//Dto快速保存
peopleEntityDto.City = "北京";
peopleEntityDto.SaveGen(context);

//Dto快速删除
peopleEntityDto.DeleteGen(context);

//最后保存操作
context.SaveChanges();

6. 自动创建选项代码

AutoOption

• FieldName

选项字段名

• Options

可选项目,使用“代码:存储:显示”格式，采用换行或“;”分割，示例：

• 1:Option1:选项1
• 2:Option2:选项2

示例

    [AutoOption("Sex", @"
Female:0:女
Male:1:男
")]
    public partial class People
    {
    }

生成代码如下

public partial class People
{
    public class ESex
    {
        [DisplayName("女")]
        public static string Female { get; set; } = "0";
        [DisplayName("男")]
        public static string Male { get; set; } = "1";
    }

    public static List<OptionCore> ESexOption {get; } = new List<OptionCore>()
    {
        new OptionCore("0","女"),
        new OptionCore("1","男"),
    };

    public static List<OptionCore> ESexFilter {get; } = new List<OptionCore>()
    {
        new OptionCore("","全部"),
        new OptionCore("0","女"),
        new OptionCore("1","男"),
    };
}

7. 自动实现INotifyPropertyChanged接口

[AddNotifyPropertyChanged("Id", typeof(long), XmlSummary = "从类上创建属性")]
partial class Demo0
{
    [AddNotifyPropertyChanged(XmlSummary = "从字段创建属性")]
    private string _name;
}

生成代码如下

partial class Demo0  : INotifyPropertyChanged
{
    
    #region 接口相关
    
    public event PropertyChangedEventHandler? PropertyChanged;
    
    private bool SetProperty<T>(ref T storage, T value , [CallerMemberName] string? propertyName = null)
    {
        if (EqualityComparer<T>.Default.Equals(storage, value)) return false;
        storage = value;
        OnPropertyChanged(propertyName);
        return true;
    }
    
    private void OnPropertyChanged(string? propertyName) =>
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    
    #endregion
    
    #region 生成的属性和字段

    private long _id;
    /// <summary>
    /// 从类上创建属性
    /// </summary>
    public long Id
    {
        get => _id;
        set => SetProperty(ref _id, value);
    }
    
    /// <summary>
    /// 从字段创建属性
    /// </summary>
    public string? Name
    {
        get => _name;
        set => SetProperty(ref _name, value);
    }

    #endregion
}