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netCore WebAPI基础3


资源更新

  • put:对所有资源进行更新
  • patch:对部分资源进行更新
    put使用方法和post相同,但是put是幂等的。

patch使用

数据样式

netCore WebAPI基础3_.netcore

patch的6个操作

  1. add:添加字段
  2. remove:删除字段
  3. replace:替换字段数据
  4. move:转移
  5. copy:复制
  6. test:测试

使用步骤

  1. nuget 安装​​Microsoft.AspNetCore.JsonPatch​​​和​​Microsoft.AspNetCore.Mvc.NewtonsoftJson​
  2. 更新数据的操作方法

[HttpPatch("{touristRouteId}")]
public IActionResult PartiallyUpdateTouristRoute([FromRoute] Guid touristRouteId, [FromBody] JsonPatchDocument<TouristRouteForUpdateDto> patchDocument)
{
//原始数据
var touristRouteFromRepo = _tourisTouteRepository.GetTourisRoute(touristRouteId);
//原始数据转创建dto 需要在profile中设定mapper转换
var touristRouteToPatch = _mapper.Map<TouristRouteForUpdateDto>(touristRouteFromRepo);
//JsonPatch修改数据更新到dto上,打补丁,并绑定ModelState
patchDocument.ApplyTo(touristRouteToPatch,ModelState);
if (!TryValidateModel(touristRouteToPatch))//验证数据
{
return ValidationProblem(ModelState);
}
//JsonPatch已经修改了的更新数据映射到原始数据上
//从 touristRouteToPatch到touristRouteFromRepo
_mapper.Map(touristRouteToPatch, touristRouteFromRepo);//此时context中的数据已经被mapper更改
_tourisTouteRepository.Save();
return NoContent();
}

  1. program

builder.Services.AddControllers(opt => {
opt.ReturnHttpNotAcceptable = true;
}).AddNewtonsoftJson(opt => {//注册
opt.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
})

  1. 前端的body数据

[
{
"op": "replace",
"path": "/title",
"value": "AAAAAAAAA"
},
{
"op": "replace",
"path": "/description",
"value": "BBBB"
}
]

删除

有选择的删除形式​​DELETE api/touristRoutes/(1,3,4,5)​

  1. 控制器的操作方法

[HttpDelete("({touristIds})")]
public IActionResult DeleteTouristRoutes([ModelBinder(BinderType = typeof(ArrayModelBinder))][FromRoute]IEnumerable<Guid> touristIds)
{//收到touristIds(1,3,4,5)自动转换
if (touristIds == null)
{
return BadRequest();
}
//仓库服务收到的字符串是已经处理好的
var toruistRoutesFromRepo = _tourisTouteRepository.GetTouristRouteByIdList(touristIds);
_tourisTouteRepository.DeleteTouristRoutes(toruistRoutesFromRepo);
_tourisTouteRepository.Save();
return NoContent();
}

2.模型绑定

public class ArrayModelBinder : IModelBinder
{
public Task BindModelAsync(ModelBindingContext bindingContext)
{
// 确定是否是Enumerable类型
if (!bindingContext.ModelMetadata.IsEnumerableType)
{
bindingContext.Result = ModelBindingResult.Failed();
return Task.CompletedTask;
}

//通过ValueProvider获得输入的值
var value = bindingContext.ValueProvider
.GetValue(bindingContext.ModelName).ToString();

// 如果值为空
if (string.IsNullOrWhiteSpace(value))
{
bindingContext.Result = ModelBindingResult.Success(null);
return Task.CompletedTask;
}

//通过反射获得Enumerable的类型并得到一个转换器
var elementType = bindingContext.ModelType.GetTypeInfo().GenericTypeArguments[0];
var converter = TypeDescriptor.GetConverter(elementType);

//使用逗号分割,并将所有的值使用转换器进行转换到一个数组中
var values = value.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => converter.ConvertFromString(x.Trim()))
.ToArray();

//通过反射创建具体的数组,并赋值
var typedValues = Array.CreateInstance(elementType, values.Length);
values.CopyTo(typedValues, 0);
bindingContext.Model = typedValues;

//成功,并传递Model
bindingContext.Result = ModelBindingResult.Success(bindingContext.Model);
return Task.CompletedTask;
}
}

Post

在head中携带新插入数据的链接

//控制器中获得信息的方法,定义name以供post使用
[HttpGet("{pictureId}", Name = "GetPictureForTouristRoute")]
public async Task <IActionResult> GetPictureForTouristRoute(Guid touristRouteId, int pictureId)
{
if (!await _tourisTouteRepository.TouristRouteExistsAsync(touristRouteId))
{
return NotFound("旅游线路不存在");
}
var picture = await _tourisTouteRepository.GetPictureAsync(pictureId);
if (picture == null)
{
return NotFound("照片不存在");
}
var pictureDto = _mapper.Map<TouristRoutePictureDto>(picture);
return Ok(pictureDto);
}
//post方法
[HttpPost]
public async Task<IActionResult> CreateTouristRoutePicture([FromRoute] Guid touristRouteId, [FromBody] TouristRoutePictureForCreateDto touristRoutePictureForCreationDto)
{
if (!await _tourisTouteRepository.TouristRouteExistsAsync(touristRouteId))
{
return NotFound("旅游线路不存在");
}
//从createDto转换为模型数据
var pictureModel = _mapper.Map<TouristRoutePicture>(touristRoutePictureForCreationDto);
_tourisTouteRepository.AddTouristRoutePicture(touristRouteId, pictureModel);//插入模型数据
await _tourisTouteRepository.SaveAsync();
//从模型数据转换为视图Dto
var pictureToReturn = _mapper.Map<TouristRoutePictureDto>(pictureModel);
//目的是在返回的head中携带新插入数据的链接,第一个参数为上面的name,第二个参数是上面方法需要的参数,第三个则是需要返回的信息
return CreatedAtRoute("GetPictureForTouristRoute", new { touristRouteId = pictureModel.TouristRouteId, pictureId = pictureModel.Id }, pictureToReturn);
}


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