第四单元 视图与模型

create database MvcUnit4;
go
use MvcUnit4;
go
create table Product
(
    Id bigint primary key,
    ProductName varchar(30),
    CategoryName varchar(30),
    Price decimal(10,2),
    Remark varchar(200),
    CreatedUserId bigint,
    UpdatedUserId bigint,
    CreatedTime datetime,
    UpdatedTime datetime,
    Deleted bit
);
insert into Product values(1,'C# 入门','.Net 开发',25,'',1,1,getdate(),getdate(),0);
insert into Product values(2,'Sql基础','数据库',25,'',1,1,getdate(),getdate(),0);
insert into Product values(3,'SQL高级','数据库',120,'',1,1,getdate(),getdate(),0);
insert into Product values(4,'Ado.Net','数据库访问技术',25,'',1,1,getdate(),getdate(),0);
insert into Product values(5,'EntityFramework','数据库访问技术',120,'',1,1,getdate(),getdate(),0);
insert into Product values(6,'C#高级','.Net 开发',140,'',1,1,getdate(),getdate(),0);
insert into Product values(7,'Asp.net Mvc Core','.Net 开发',25,'',2,2,getdate(),getdate(),0);
insert into Product values(8,'MySql基础','数据库',25,'',2,2,getdate(),getdate(),0);
go
create table UserInfo
(
    Id bigint primary key,
    UserName varchar(30),
    NickName varchar(30),
    Pwd varchar(50),
    CreatedUserId bigint,
    UpdatedUserId bigint,
    CreatedTime datetime,
    UpdatedTime datetime,
    Deleted bit
);
insert into UserInfo values(1,'renwoxing','任我行','123456',0,0,getdate(),getdate(),0);
insert into UserInfo values(2,'xiaoming','小明','123456',0,0,getdate(),getdate(),0);
 

// 父类数据实体
public class BaseEntity
{
    public long Id{ get;set;}
    public long CreatedUserId { get; set;}
    public long UpdatedUserId { get; set;}
    public DateTime CreatedTime { get; set; }= DateTime.Now;
    public DateTime UpdatedTime { get; set; }= DateTime.Now;
    public bool Deleted { get; set; } = false;
}
// 商品数据实体
class Product : BaseEntity {
    public String ProductName {get; set;}
    public decimal Price { get; set; }
    public String CategoryName { get; set; }
    public String Remark { get; set; }
}
​
// 用户数据实体
class UserInfo : BaseEntity{
    public String UserName { get;set;} 
    public String NickName { get;set;} 
    public String Pwd { get;set;} 
}

class ProductViewModel{
    public long Id;
    public String ProductName {get; set;}
    public decimal Price { get; set; }
    public String CategoryName { get; set; }
    public String CreatedNickName { get; set; }
    public String UpdatedNickName { get; set; }
    public DateTime UpdatedTime { get; set; }
}

// 父类输入数据
class BaseInput{
    public long Id{ get;set;}
    public long CreatedUserId { get; set;}
    public long UpdatedUserId { get; set;}
    public DateTime CreatedTime => DateTime.Now;
    public DateTime UpdatedTime => DateTime.Now;
    public bool Deleted => false;
}
class ProductInput : BaseInput{
    public String ProductName {get; set;}
    public decimal Price { get; set; }
    public String CategoryName { get; set; }
    public String Remark {get;set;}
}

public class ProductController:Controller
{
    private readonly IdWorker _idWorker;
    private readonly IProductService _productService;
    public ProductController(IProductService productService)
    {
        _productService = productService;
        _idWorker = SnowflakeUtil.CreateIdWorker();
    }
    public IActionResult Create(ProductInput input)
    {
        // 将ProductInput 转换为 Product 数据实体对象
         // (实际开发场景下，Input实体转换为数据实体过程应放至业务逻辑层)
        Product entity = new()
        {
            Id = _idWorker.NextId(), // 雪花Id
            CategoryName = input.CategoryName,
            Price = input.Price,
            ProductName = input.ProductName
        };
        _productService.Save(entity);

        return Ok("添加成功");
    }
}

public class OrganizationProfile : Profile
{
    public OrganizationProfile()
    {
        CreateMap<Foo, FooDto>();
    }
}

var configuration = new MapperConfiguration(cfg => {
    //cfg.CreateMap<Foo, Bar>();
    cfg.AddProfile<OrganizationProfile>();//或者cfg.AddProfile(new OrganizationProfile());
});
var mapper=configuration.CreateMapper();//或者var mapper=new Mapper(configuration);

var dest=mapper.Map<OrderDto>(order);

//1. 配置服务里Add,入参类型为params
build.Services.AddAutoMapper(typeof(OrganizationProfile));

//2. 然后在Controller里使用即可：
public XXXController(IMapper mapper)
{
    _mapper = mapper;
    var dest=mapper.Map<OrderDto>(order);
}
 

//方法1
var configuration = new MapperConfiguration(cfg => cfg.AddMaps(myAssembly));

//方法2：通过程序集名
var configuration = new MapperConfiguration(cfg =>
    cfg.AddMaps(new [] {
        "Foo.UI", // 程序集名称
        "Foo.Core"
    });
);

builder.Services.AddAutoMapper(cfg =>
{
    cfg.AddProfile<CustomerProfile>();
    // propertyName ------> PropertyName 默认是支持的
    cfg.SourceMemberNamingConvention = new LowerUnderscoreNamingConvention();
    cfg.DestinationMemberNamingConvention = new PascalCaseNamingConvention();
});

public class OrganizationProfile : Profile
{
    public OrganizationProfile()
    {
        SourceMemberNamingConvention = new LowerUnderscoreNamingConvention();
        DestinationMemberNamingConvention = new PascalCaseNamingConvention();
        //Put your CreateMap... Etc.. here
    }
}

var configuration = new MapperConfiguration(c =>
{
    c.ReplaceMemberName("Ä", "A");
    c.ReplaceMemberName("í", "i");
    c.ReplaceMemberName("Airlina", "Airline");
});

var configuration = new MapperConfiguration(cfg => {
    cfg.RecognizePrefixes("frm");
    //cfg.RecongizePostfixes("后缀");
    cfg.CreateMap<Source, Dest>();
});

cfg.ClearPrefixes();//清除所有前缀

cfg.ShouldMapField = fi => false;
cfg.ShouldMapProperty = pi =>pi.GetMethod != null && (pi.GetMethod.IsPublic || pi.GetMethod.IsPrivate);

var configuration = new MapperConfiguration(cfg => {});
configuration.CompileMappings();

mapper.Map<Source[], IEnumerable<Destination>>(sources);

// Configure AutoMapper
var configuration = new MapperConfiguration(cfg =>
  cfg.CreateMap<CalendarEvent, CalendarEventForm>()
    .ForMember(dest => dest.EventDate, opt => opt.MapFrom(src => src.Date.Date))
    .ForMember(dest => dest.EventHour, opt => opt.MapFrom(src => src.Date.Hour))
    .ForMember(dest => dest.EventMinute, opt => opt.MapFrom(src => src.Date.Minute))
);

var config = new MapperConfiguration(cfg => {
    cfg.CreateMap<OuterSource, OuterDest>();
    cfg.CreateMap<InnerSource, InnerDest>();
});
 

var configuration = new MapperConfiguration(c=> {
    c.CreateMap<ParentSource, ParentDestination>()
         .Include<ChildSource, ChildDestination>();
    c.CreateMap<ChildSource, ChildDestination>();
});

CreateMap<ParentSource,ParentDestination>();
CreateMap<ChildSource,ChildDestination>()
    .IncludeBase<ParentSource,ParentDestination>();

CreateMap<ParentSource,ParentDestination>().IncludeAllDerived();
CreaetMap<ChildSource,ChildDestination>();

public class Source{
    public Source(int value) {
        this.Value = value;
    }
   public int Value { get; set; }  
}
public class SourceDto {
    public SourceDto(int value) {
        _value = value;
    }
    private int _value;
    public int Value {
        get { return _value; }
    }
}
 

var configuration = new MapperConfiguration(cfg =>
  cfg.CreateMap<Source, SourceDto>()
    .ForCtorParam("value2", opt => opt.MapFrom(src => src.Value))
);

var configuration = new MapperConfiguration(cfg => cfg.DisableConstructorMapping());

var configuration = new MapperConfiguration(cfg => cfg.ShouldUseConstructor = ci => !ci.IsPrivate);//不匹配私有构造函数

public class Src
{
    public Customer Customer {get;set;}
    public int GetTotal()
    {
        return 0;
    }
}
public class Customer
{
    public string Name {get;set;}
}
public class Dest
{
    public string CustomerName {get;set;}
    public int Total {get;set;}
}

cfg.CreateMap<Src,Dest>().ForMember(d=>d.CustomerName,opt=>opt.MapFrom(src=>src.Customer.Name))

class Source
{
    public string Name { get; set; }
    public InnerSource InnerSource { get; set; }
    public OtherInnerSource OtherInnerSource { get; set; }
}
class InnerSource
{
    public string Name { get; set; }
    public string Description { get; set; }
}
class OtherInnerSource
{
    public string Name { get; set; }
    public string Description { get; set; }
    public string Title { get; set; }
}
class Destination
{
    public string Name { get; set; }
    public string Description { get; set; }
    public string Title { get; set; }
}

cfg.CreateMap<Source, Destination>().IncludeMembers(s=>s.InnerSource, s=>s.OtherInnerSource);
cfg.CreateMap<InnerSource, Destination>(MemberList.None);
cfg.CreateMap<OtherInnerSource, Destination>();

var source = new Source { Name = "name", InnerSource = new InnerSource{ Description = "description" }, OtherInnerSource = new OtherInnerSource{ Title = "title",Description="descpripiton2" } };
var destination = mapper.Map<Destination>(source);
destination.Name.ShouldBe("name");
destination.Description.ShouldBe("description");
destination.Title.ShouldBe("title");

cfg.CreateMap<Order, OrderDto>().ReverseMap();
//等同于以下两句
cfg.CreateMap<Order,OrderDto>();
cfg.CreateMap<OrderDto,Order>();

cfg.CreateMap<Order, OrderDto>()
  .ForMember(d => d.CustomerName, opt => opt.MapFrom(src => src.Customer.Name))
  .ReverseMap()
  .ForPath(s => s.Customer.Name, opt => opt.MapFrom(src => src.CustomerName));

cfg.CreateMap<Order, OrderDto>()
    .ForMember(d => d.CustomerName, opt => opt.Ignore())
    .ReverseMap()
    .ForMember(d => d.CustomerName, opt => opt.Ignore())

[AutoMap(typeof(Order))]
public class OrderDto {}

var configuration = new MapperConfiguration(cfg => cfg.AddMaps("MyAssembly"));
var mapper = new Mapper(configuration);

ReverseMap (bool)
ConstructUsingServiceLocator (bool)
MaxDepth (int)
PreserveReferences (bool)
DisableCtorValidation (bool)
IncludeAllDerived (bool)
TypeConverter (Type)

public class Source<T> {}
public class Destination<T> {}
var configuration = new MapperConfiguration(cfg => cfg.CreateMap(typeof(Source<>), typeof(Destination<>)));

public class OrderLine
{
    public int Id { get; set; }
    public int OrderId { get; set; }
    public Item Item { get; set; }
    public decimal Quantity { get; set; }
}
public class Item
{
    public int Id { get; set; }
    public string Name { get; set; }
}
public class OrderLineDTO
{
    public int Id { get; set; }
    public int OrderId { get; set; }
    public string Item { get; set; }
    public decimal Quantity { get; set; }
}

var configuration = new MapperConfiguration(cfg =>
                                            cfg.CreateMap<OrderLine, OrderLineDTO>()
                                            .ForMember(dto => dto.Item, conf => conf.MapFrom(ol => ol.Item.Name)));

public List<OrderLineDTO> GetLinesForOrder(int orderId)
{
    using (var context = new orderEntities())
    {
        return context.OrderLines.Where(ol => ol.OrderId == orderId)
            .ProjectTo<OrderLineDTO>(configuration).ToList();
    }
}
//这样查Item表的时候，只会select name字段。
 

public enum Source
{
    Default = 0,
    First = 1,
    Second = 2
}

public enum Destination
{
    Default = 0,
    Second = 2
}

internal class YourProfile : Profile
{
    public YourProfile()
    {
        CreateMap<Source, Destination>()
            .ConvertUsingEnumMapping(opt => opt
                // optional: .MapByValue() or MapByName(), without configuration MapByValue is used
                .MapValue(Source.First, Destination.Default)
            )
            .ReverseMap(); 
    }
}

void ConvertUsing(Func<TSource, TDestination> mappingFunction);
void ConvertUsing(ITypeConverter<TSource, TDestination> converter);
void ConvertUsing<TTypeConverter>() where TTypeConverter : ITypeConverter<TSource, TDestination>;

public class Source
{
    public string Value1 { get; set; }
    public string Value2 { get; set; }
    public string Value3 { get; set; }
}
public class Destination
{
    public int Value1 { get; set; }
    public DateTime Value2 { get; set; }
    public Type Value3 { get; set; }
}
public void Example()
{
    var configuration = new MapperConfiguration(cfg => {
        cfg.CreateMap<string, int>().ConvertUsing(s => Convert.ToInt32(s));
        cfg.CreateMap<string, DateTime>().ConvertUsing(new DateTimeTypeConverter());
        cfg.CreateMap<string, Type>().ConvertUsing<TypeTypeConverter>();
        cfg.CreateMap<Source, Destination>();
    });
    configuration.AssertConfigurationIsValid();
    var source = new Source
    {
        Value1 = "5",
        Value2 = "01/01/2000",
        Value3 = "AutoMapperSamples.GlobalTypeConverters.GlobalTypeConverters+Destination"
    };

    Destination result = mapper.Map<Source, Destination>(source);
    result.Value3.ShouldEqual(typeof(Destination));
}

public class DateTimeTypeConverter : ITypeConverter<string, DateTime>
{
    public DateTime Convert(string source, DateTime destination, ResolutionContext context)
    {
        return System.Convert.ToDateTime(source);
    }
}

public class TypeTypeConverter : ITypeConverter<string, Type>
{
    public Type Convert(string source, Type destination, ResolutionContext context)
    {
        return Assembly.GetExecutingAssembly().GetType(source);
    }
}

MapFrom<TValueResolver>
    MapFrom(typeof(CustomValueResolver))
    MapFrom(new CustomResolver())
    public class Source
    {
        public int Value1 { get; set; }
        public int Value2 { get; set; }
    }
public class Destination
{
    public int Total { get; set; }
}
public class CustomResolver : IValueResolver<Source, Destination, int>
{
    public int Resolve(Source source, Destination destination, int member, ResolutionContext context)
    {
        //可以添加其他逻辑
        return source.Value1 + source.Value2;
    }
}
var configuration = new MapperConfiguration(cfg =>
                                            cfg.CreateMap<Source, Destination>()
                                            .ForMember(dest => dest.Total, opt => opt.MapFrom<CustomResolver>()));
configuration.AssertConfigurationIsValid();

var source = new Source
{
    Value1 = 5,
    Value2 = 7
};

var result = mapper.Map<Source, Destination>(source);
result.Total.ShouldEqual(12);

cfg.CreateMap<Source, Dest>()
    .ForMember(dest => dest.Foo, opt => opt.MapFrom((src, dest, destMember, context) => context.Items["Foo"]));
mapper.Map<Source, Dest>(src, opt => opt.Items["Foo"] = "Bar");

var configuration = new MapperConfiguration(cfg => {
    cfg.CreateMap<Foo,Bar>()
        .ForMember(dest => dest.baz, opt => opt.Condition(src => (src.baz >= 0)));
});
var configuration = new MapperConfiguration(cfg => {
    cfg.CreateMap<Foo,Bar>()
        .ForMember(dest => dest.baz, opt => {
            opt.PreCondition(src => (src.baz >= 0));
            opt.MapFrom(src => {
                //有了Precondition,这里的操作有可能不执行，节省资源
            });
        });
});

var config = new MapperConfiguration(cfg => cfg.CreateMap<Source, Dest>()
                                     .ForMember(destination => destination.Value, opt => opt.NullSubstitute("Other Value")));
var source = new Source { Value = null };
var mapper = config.CreateMapper();
var dest = mapper.Map<Source, Dest>(source);

dest.Value.ShouldEqual("Other Value");

source.Value = "Not null";
dest = mapper.Map<Source, Dest>(source);
dest.Value.ShouldEqual("Not null");
 

var configuration = new MapperConfiguration(cfg => {
    cfg.ValueTransformers.Add<string>(val => val + "!!!");
});

var source = new Source { Value = "Hello" };
var dest = mapper.Map<Dest>(source);

dest.Value.ShouldBe("Hello!!!");

var configuration = new MapperConfiguration(cfg => {
    cfg.CreateMap<Source, Dest>()
        .BeforeMap((src, dest) => src.Value = src.Value + 10)
        .AfterMap((src, dest) => dest.Name = "John");
});

int i = 10;
mapper.Map<Source, Dest>(src, opt => {
    opt.BeforeMap((src, dest) => src.Value = src.Value + i);
    opt.AfterMap((src, dest) => dest.Name = HttpContext.Current.Identity.Name);
});

var configuration = new MapperConfiguration(cfg => {
    cfg.AllowNullCollections = true;
    cfg.CreateMap<Source, Destination>();
});

Type converter = Func<TSource, TDestination, TDestination>
Value resolver = Func<TSource, TDestination, TDestinationMember>
Member value resolver = Func<TSource, TDestination, TSourceMember, TDestinationMember>
Value converter = Func<TSourceMember, TDestinationMember>

class Person
{
    public string Name { get; set; }
    public int Age { get; set; }  
}
class Person2
{
   public string Name { get; set; }
   public int? Age { get; set; }
   public DateTime BirthTime { get; set; }
}
public class NormalProfile : Profile
{
    public NormalProfile()
    {
       //CreateMap<Person2, Person>();//
    }
}

var cfg = new MapperConfiguration(c => 
{ 
    c.AddProfile<NormalProfile>();
});
//cfg.AssertConfigurationIsValid();
var mapper = cfg.CreateMapper();
var s3 = mapper.Map<Person>(new Person2 { Name = "Person2" });

public class NormalProfile : Profile
{
    public NormalProfile()
    {
        ShouldMapField = fi => false;
        CreateMap<Person2, Person>().ReverseMap();
    }
}
或者

var cfg = new MapperConfiguration(c => 
{ 
    c.AddProfile<XXXXProfile>();
    c.ShouldMapField = fi => false;
});
 

@using (Html.BeginForm("Search" , "Home" , FormMethod.Get , new{ target = "_blank" })){
    <input type="text" name="q" />
    <input type="submit" value="Search" />
}

public ActionResult HelperSample1()
{
    IDictionary<string, object> attr = new Dictionary<string, object>();
    attr.Add("size", "32");
    attr.Add("style", "color:red;");
    ViewData["Dictionary"] = attr;
    return View();
}

@{
    var htmlAttribute = ViewData["Dictionary"] as IDictionary<string, object>;
}

@Html.TextBox("name","Value",htmlAttribute)<br />

    @Html.Password("password","Value",htmlAttribute)<br />

    @Html.TextBox("email","Value",htmlAttribute)<br />

    @Html.TextBox("tel","Value",htmlAttribute)<br />

    @Html.Hidden("id","1")
 

 

$("#id").prop("type","text") $("#id").prop("type","password")

public ActionResult HelperSample2()

{

    List<SelectListItem> listItem = new List<SelectListItem>();

    listItem.Add(new SelectListItem { Text = "是", Value = "1" });

    listItem.Add(new SelectListItem { Text = "否", Value = "0" });

    ViewData["List"] = new SelectList(listItem, "Value", "Text", "");

    return View();

}

public ActionResult Index()
{
    var list = new SelectList(db.Students, "Id", "Age", "3"); //参数依次为数据集合，数据值，数据文本，选中项的值

    ViewBag.List = list;
    return View();
}

@Html.DropDownList("List")

public ActionResult GetPartialView()
{
    return PartialView();
}

[Display(Name = "账号")]
[Required(ErrorMessage = "请输入账号")]
public String? Account { get; set; }

[Display(Name = "密码")]
[DataType(DataType.Password)]
[Required(ErrorMessage = "请输入密码")]
public String? Password { get; set; }

[Display(Name = "确认密码")]
[DataType(DataType.Password)]
[Compare("Password",ErrorMessage = "两次输入的密码不一致")]
public String? ConfirmPassword { get; set; }

[Display(Name = "爱好")]
public String[]? Hobby { get; set; }

[Display(Name = "性别")]
public bool? Gender { get; set; }

[Display(Name = "祖籍")]
public int Province { get; set; }

[Display(Name = "生日")]
[DataType(DataType.Date)]
[Required(ErrorMessage = "请选择你的生日")]
public DateTime Birthday { get; set; }

[Display(Name = "简介")]
public string? Description { get; set; }

public OrderState OrderState { get; set; }


public enum OrderState{
    WaitPay,
    WaitSend,
    WaitReceive,
    Finish,
    Cancel
}
 

Required(必填)

[Display(Name = "昵称"),Required(ErrorMessage = "请您输入昵称")]

public string NickName { get; set; }
StringLength(字段串长度)

[Display(Name = "密码"),StringLength(16,MinimumLength = 6,ErrorMessage = "密码长度6-16位")]

public string  Password { get; set; }

[Display(Name = "邮箱"),Required(ErrorMessage = "请输入邮箱"),RegularExpression(@"[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+", ErrorMessage = "请输入正确的邮箱地址")]

public string Email { get; set; }

[StringLength(16,MinimumLength = 6,ErrorMessage = "密码长度6-16位")]
public string  Password { get; set; }

[Compare(otherProperty = "Password",ErrorMessage="确认密码不一致" )]
public string ConfirmPwd { get; set; }

[Display(Name = "年龄"),Range(15,35,ErrorMessage = "年龄只能是15-35周岁")]
public int Age { get; set; }

[HttpPost]
public ActionResult Index(Register reg)
{
    // 因为我们已经做了模型校验了，所以这些判断我们都不需要加了
    
    /*if (String.IsNullOrEmpty(reg.UserName))
    {
        ModelState.AddModelError("UserName", "用户名不能为空");
    }
    else if (reg.UserName.Length < 6)
    {
        ModelState.AddModelError("UserName", "用户名长度不能小于6位");
    }
    if (ModelState.IsValidField("BirthDate") && reg.BirthDate > DateTime.Now)
    {
        ModelState.AddModelError("BirthDate", "生日不能为将来的时间");
    }*/
    
    
    if (ModelState.IsValid) // 只有当所有的表单都校验通过了，IsValid 才为true
    {
        //保存数据
    }
    return View();
}

<div>
    用户名：
    @Html.EditorFor(m => m.UserName)
    @Html.ValidationMessageFor(m => m.UserName)
</div>
<div>
    出生日期：
    @Html.EditorFor(m => m.BirthDate)
    @Html.ValidationMessageFor(m => m.BirthDate)
</div>

<a href="product/detail/3">详情</a> // 路由传值
<a href="product/detail?id=3">详情</a> <!--url方式传值-->
public IActionResult Detail(int id) // id=3
{
    
}

<form asp-action="Submit" asp-controller="Product">
    <div class="form-group row">
        <label for="Id">主键:</label>
        <input class="form-control" name="Id" id="Id"/>
    </div>
    <div class="form-group row">
        <label for="ProductName">商品名称</label>
        <input class="form-control" id="ProductName" name="ProductName"/>
    </div>
    <div class="form-group">
        <label for="ProductName">商品名称</label>
        <input class="form-control" id="Price" name="Price"/>
    </div>
    <div class="form-group">
        <label for="ProductCategory">分类名称</label>
        @Html.TextBoxFor(p=>p.ProductCategory.CategoryName,new{@class="form-control"})
    </div>
    <div class="form-group">
        <input type="submit" class="btn btn-primary" value="提交"/>
    </div>
</form>
public class Category
{
    public int Id { get; set;}
    public String CategoryName { get;set;}
}
public class ProductInput
{
    public int Id { get; set;}
    public String ProductName { get;set;}
    public decimal Price { get;set;}
    public Category ProductCategory { get; set; }
}

public IActionResult Create()
{
    return View();
}

[HttpPost]
public IActionResult Submit(ProductInput input)
{
    return Ok("添加成功");
}
 

[HttpPost]
public IActionResult Submit([Bind("ProductName","Id")] ProductInput input)
{
    return Ok("添加成功");
}

public class ProductInput
{
    [BindNever] // 表示Id永远不会被绑定上
    public int Id { get; set;}
    public String ProductName { get;set;}
    public String Price { get;set;}
    public Category ProductCategory { get; set; }
}

public class ProductInput
{
    [BindNever] // 表示Id永远不会被绑定上
    public int Id { get; set;}
    public String ProductName { get;set;}
    [BindRequired] 
    public decimal Price { get;set;}
    public Category ProductCategory { get; set; }
}

public class ProductQuery
{
    public String Name { get; set;}
    public int StartPrice { get; set;}
    public int EndPrice { get; set;}
}
// 商品查询方法
public IActionResult Search([FromQUery] ProductQuery condition)
{
    
}

public ActionResult<Pet> Create([FromBody] Pet pet)

public class Pet
{
    public string Name { get; set; } = null!;

    [FromQuery] // Attribute is ignored.
    public string Breed { get; set; } = null!;
}

[HttpPost]
public IActionResult Submit([FromForm] ProductInput input)
{

    return Ok("添加成功");
}

<form enctype="multipart/form-data" method="post" action="/student/add">
    <div>
        头像：<input type="file" name="HeadPhoto"/>
    </div>
    
    <input type="submit" value="提交"/>
</form>
private readonly IWebHostEnvironment _hostEnvironment;

public StudentController(IWebHostEnvironment hostEnvironment)
{
    _hostEnvironment = hostEnvironment;
}

public IActionResult Add()
{
    return View();
}

[HttpPost]
public IActionResult Add(IFormFile headPhoto)
{
    // 获取文件后缀名
    var extension = Path.GetExtension(headPhoto.FileName);
    // 为文件重命名，防止文件重名
    var fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff")+"."+extension ;

    using FileStream fileStream = new FileStream(
        // 拼接上传路径(upload文件夹必须事先存在)
        Path.Combine(_hostEnvironment.ContentRootPath, "upload", fileName),
        FileMode.Create, FileAccess.Write);
    // 上传
    headPhoto.CopyTo(fileStream);

    return Content("上传成功");
}
 

<form enctype="multipart/form-data" method="post" action="/student/add">
    <div>
        头像：<input type="file" name="HeadPhoto" multiple="multiple"/>
    </div>
    
    <input type="submit" value="提交"/>
</form>
 

[HttpPost]
public IActionResult Add(IFormFile[] headPhoto)
{
    foreach (var formFile in headPhoto)
    {
        // 获取文件后缀名
        var extension = Path.GetExtension(formFile.FileName);
        // 为文件重命名，防止文件重名
        var fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff")+"."+extension ;

        using FileStream fileStream = new FileStream(
            // 拼接上传路径(upload文件夹必须事先存在)
            Path.Combine(_hostEnvironment.ContentRootPath, "upload", fileName),
            FileMode.Create, FileAccess.Write);

        formFile.CopyTo(fileStream);
    }

    return Content("上传成功");
}
 

<form enctype="multipart/form-data" method="post" action="/student/add">
    <div>
        姓名：<input asp-for="Name"/>
    </div>
    <div>
        头像：<input type="file" name="HeadPhoto"/>
    </div>
    
    <input type="submit" value="提交"/>
</form>
public class Student
{
    public int Id { get; set; }
    public string? Name { get; set; }
    // 需要上传的文件
    public IFormFile? HeadPhoto { get; set; }
}
// 使用Student对象接收
[HttpPost]
public IActionResult Add(Student student)
{
    // 获取文件后缀名
    var extension = Path.GetExtension(student.HeadPhoto?.FileName);
    // 为文件重命名，防止文件重名
    var fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + "." + extension;

    using FileStream fileStream = new FileStream(
        // 拼接上传路径(upload文件夹必须事先存在)
        Path.Combine(_hostEnvironment.ContentRootPath, "upload", fileName),
        FileMode.Create, FileAccess.Write);

    student.HeadPhoto?.CopyTo(fileStream);


    return Content("上传成功");
}
 

[RequestFormLimits(MultipartBodyLengthLimit = 209715200)]
[RequestSizeLimit(209715200)]
[HttpPost]
public IActionResult Add(IFormFile headPhoto)
{
    // ...
}

[HttpPost]
[RequestFormLimits(MultipartBodyLengthLimit = 609715200)]
[RequestSizeLimit(609715200)]
public async Task<IActionResult> UploadLargeFile()
{
    var request = HttpContext.Request;
​
    if (!request.HasFormContentType ||
        !MediaTypeHeaderValue.TryParse(request.ContentType, out var mediaTypeHeader) ||
        string.IsNullOrEmpty(mediaTypeHeader.Boundary.Value))
    {
        return new UnsupportedMediaTypeResult();
    }
​
    var reader = new MultipartReader(mediaTypeHeader.Boundary.Value, request.Body);
    var section = await reader.ReadNextSectionAsync();
​
    while (section != null)
    {
        var hasContentDispositionHeader = ContentDispositionHeaderValue.TryParse(section.ContentDisposition,
                                                                                 out var contentDisposition);
​
        if (hasContentDispositionHeader && contentDisposition.DispositionType.Equals("form-data") &&
            !string.IsNullOrEmpty(contentDisposition.FileName.Value))
        {
            // 获取文件后缀名
            var extension = Path.GetExtension(contentDisposition.FileName.Value);
            // 为文件重命名，防止文件重名
            var fileName = DateTime.Now.ToString("yyyyMMddHHmmssfff") + "." + extension;
            var saveToPath = Path.Combine(_hostEnvironment.ContentRootPath, "upload", fileName);
​
​
            using var targetStream = System.IO.File.Create(saveToPath);
            await section.Body.CopyToAsync(targetStream);
            
        }
​
        section = await reader.ReadNextSectionAsync();
    }
​
    return Ok("上传成功");
}