我有一个ASP。NET Web API(版本4)REST服务,我需要传递一个整数数组。
下面是我的动作方法:
public IEnumerable<Category> GetCategories(int[] categoryIds){
// code to retrieve categories from database
}
这是我试过的网址:
/Categories?categoryids=1,2,3,4
我有一个ASP。NET Web API(版本4)REST服务,我需要传递一个整数数组。
下面是我的动作方法:
public IEnumerable<Category> GetCategories(int[] categoryIds){
// code to retrieve categories from database
}
这是我试过的网址:
/Categories?categoryids=1,2,3,4
当前回答
你只需要在参数前添加[FromUri],看起来像:
GetCategories([FromUri] int[] categoryIds)
并发送请求:
/Categories?categoryids=1&categoryids=2&categoryids=3
其他回答
我已经创建了一个自定义模型绑定器,它将任何逗号分隔的值(仅为原语、十进制、浮点数、字符串)转换为相应的数组。
public class CommaSeparatedToArrayBinder<T> : IModelBinder
{
public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
{
Type type = typeof(T);
if (type.IsPrimitive || type == typeof(Decimal) || type == typeof(String) || type == typeof(float))
{
ValueProviderResult val = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
if (val == null) return false;
string key = val.RawValue as string;
if (key == null) { bindingContext.ModelState.AddModelError(bindingContext.ModelName, "Wrong value type"); return false; }
string[] values = key.Split(',');
IEnumerable<T> result = this.ConvertToDesiredList(values).ToArray();
bindingContext.Model = result;
return true;
}
bindingContext.ModelState.AddModelError(bindingContext.ModelName, "Only primitive, decimal, string and float data types are allowed...");
return false;
}
private IEnumerable<T> ConvertToDesiredArray(string[] values)
{
foreach (string value in values)
{
var val = (T)Convert.ChangeType(value, typeof(T));
yield return val;
}
}
}
以及如何在Controller中使用:
public IHttpActionResult Get([ModelBinder(BinderType = typeof(CommaSeparatedToArrayBinder<int>))] int[] ids)
{
return Ok(ids);
}
ASP。NET Core 2.0解决方案(Swagger Ready)
输入
DELETE /api/items/1,2
DELETE /api/items/1
Code
编写提供程序(MVC如何知道使用什么绑定器)
public class CustomBinderProvider : IModelBinderProvider
{
public IModelBinder GetBinder(ModelBinderProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (context.Metadata.ModelType == typeof(int[]) || context.Metadata.ModelType == typeof(List<int>))
{
return new BinderTypeModelBinder(typeof(CommaDelimitedArrayParameterBinder));
}
return null;
}
}
编写实际的绑定器(访问关于请求、操作、模型、类型等的各种信息)
public class CommaDelimitedArrayParameterBinder : IModelBinder
{
public Task BindModelAsync(ModelBindingContext bindingContext)
{
var value = bindingContext.ActionContext.RouteData.Values[bindingContext.FieldName] as string;
// Check if the argument value is null or empty
if (string.IsNullOrEmpty(value))
{
return Task.CompletedTask;
}
var ints = value?.Split(',').Select(int.Parse).ToArray();
bindingContext.Result = ModelBindingResult.Success(ints);
if(bindingContext.ModelType == typeof(List<int>))
{
bindingContext.Result = ModelBindingResult.Success(ints.ToList());
}
return Task.CompletedTask;
}
}
将它注册到MVC
services.AddMvc(options =>
{
// add custom binder to beginning of collection
options.ModelBinderProviders.Insert(0, new CustomBinderProvider());
});
示例使用与Swagger良好记录的控制器
/// <summary>
/// Deletes a list of items.
/// </summary>
/// <param name="itemIds">The list of unique identifiers for the items.</param>
/// <returns>The deleted item.</returns>
/// <response code="201">The item was successfully deleted.</response>
/// <response code="400">The item is invalid.</response>
[HttpDelete("{itemIds}", Name = ItemControllerRoute.DeleteItems)]
[ProducesResponseType(typeof(void), StatusCodes.Status204NoContent)]
[ProducesResponseType(typeof(void), StatusCodes.Status404NotFound)]
public async Task Delete(List<int> itemIds)
=> await _itemAppService.RemoveRangeAsync(itemIds);
编辑:微软建议使用TypeConverter来代替这种方法。因此,按照下面海报的建议,用SchemaFilter记录您的自定义类型。
你可以尝试这段代码来获取逗号分隔的值/一个值数组来从webAPI返回JSON
public class CategoryController : ApiController
{
public List<Category> Get(String categoryIDs)
{
List<Category> categoryRepo = new List<Category>();
String[] idRepo = categoryIDs.Split(',');
foreach (var id in idRepo)
{
categoryRepo.Add(new Category()
{
CategoryID = id,
CategoryName = String.Format("Category_{0}", id)
});
}
return categoryRepo;
}
}
public class Category
{
public String CategoryID { get; set; }
public String CategoryName { get; set; }
}
输出:
[
{"CategoryID":"4","CategoryName":"Category_4"},
{"CategoryID":"5","CategoryName":"Category_5"},
{"CategoryID":"3","CategoryName":"Category_3"}
]
简单的方法发送数组参数到web api
API
public IEnumerable<Category> GetCategories([FromUri]int[] categoryIds){
// code to retrieve categories from database
}
Jquery:发送JSON对象作为请求参数
$.get('api/categories/GetCategories',{categoryIds:[1,2,3,4]}).done(function(response){
console.log(response);
//success response
});
它会生成你的请求URL . . / api /类别/ GetCategories吗?categoryid = 1 &categoryids = 2 &categoryids = 3 &categoryids = 4
我的解决方案是创建一个属性来验证字符串,它做了一堆额外的公共功能,包括regex验证,你可以使用它来检查数字,然后我根据需要转换为整数…
你可以这样使用:
public class MustBeListAndContainAttribute : ValidationAttribute
{
private Regex regex = null;
public bool RemoveDuplicates { get; }
public string Separator { get; }
public int MinimumItems { get; }
public int MaximumItems { get; }
public MustBeListAndContainAttribute(string regexEachItem,
int minimumItems = 1,
int maximumItems = 0,
string separator = ",",
bool removeDuplicates = false) : base()
{
this.MinimumItems = minimumItems;
this.MaximumItems = maximumItems;
this.Separator = separator;
this.RemoveDuplicates = removeDuplicates;
if (!string.IsNullOrEmpty(regexEachItem))
regex = new Regex(regexEachItem, RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.IgnoreCase);
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var listOfdValues = (value as List<string>)?[0];
if (string.IsNullOrWhiteSpace(listOfdValues))
{
if (MinimumItems > 0)
return new ValidationResult(this.ErrorMessage);
else
return null;
};
var list = new List<string>();
list.AddRange(listOfdValues.Split(new[] { Separator }, System.StringSplitOptions.RemoveEmptyEntries));
if (RemoveDuplicates) list = list.Distinct().ToList();
var prop = validationContext.ObjectType.GetProperty(validationContext.MemberName);
prop.SetValue(validationContext.ObjectInstance, list);
value = list;
if (regex != null)
if (list.Any(c => string.IsNullOrWhiteSpace(c) || !regex.IsMatch(c)))
return new ValidationResult(this.ErrorMessage);
return null;
}
}