如果有人需要-通过POST而不是FromUri来实现相同或类似的事情(如删除)，使用FromBody和客户端(JS/jQuery)格式参数为$。参数({":categoryids}， true)

c#:

public IHttpActionResult Remove([FromBody] int[] categoryIds)

jQuery:

$.ajax({
        type: 'POST',
        data: $.param({ '': categoryids }, true),
        url: url,
//...
});

关于$。Param ({": categoryids}， true)是。net期望post正文包含urlencoded的值，如=1&=2&=3，不带参数名，不带括号。

除了使用自定义ModelBinder，还可以使用带有TypeConverter的自定义类型。

[TypeConverter(typeof(StrListConverter))]
public class StrList : List<string>
{
    public StrList(IEnumerable<string> collection) : base(collection) {}
}

public class StrListConverter : TypeConverter
{
    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        return sourceType == typeof(string) || base.CanConvertFrom(context, sourceType);
    }

    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        if (value == null)
            return null;

        if (value is string s)
        {
            if (string.IsNullOrEmpty(s))
                return null;
            return new StrList(s.Split(','));
        }
        return base.ConvertFrom(context, culture, value);
    }
}

它的优点是使Web API方法的参数非常简单。你甚至不需要指定[FromUri]。

public IEnumerable<Category> GetCategories(StrList categoryIds) {
  // code to retrieve categories from database
}

这个例子是一个字符串列表，但你可以使用categoryIds.Select(int.Parse)或简单地编写一个IntList代替。

public class ArrayInputAttribute : ActionFilterAttribute
{
    private readonly string[] _ParameterNames;
    /// <summary>
    /// 
    /// </summary>
    public string Separator { get; set; }
    /// <summary>
    /// cons
    /// </summary>
    /// <param name="parameterName"></param>
    public ArrayInputAttribute(params string[] parameterName)
    {
        _ParameterNames = parameterName;
        Separator = ",";
    }

    /// <summary>
    /// 
    /// </summary>
    public void ProcessArrayInput(HttpActionContext actionContext, string parameterName)
    {
        if (actionContext.ActionArguments.ContainsKey(parameterName))
        {
            var parameterDescriptor = actionContext.ActionDescriptor.GetParameters().FirstOrDefault(p => p.ParameterName == parameterName);
            if (parameterDescriptor != null && parameterDescriptor.ParameterType.IsArray)
            {
                var type = parameterDescriptor.ParameterType.GetElementType();
                var parameters = String.Empty;
                if (actionContext.ControllerContext.RouteData.Values.ContainsKey(parameterName))
                {
                    parameters = (string)actionContext.ControllerContext.RouteData.Values[parameterName];
                }
                else
                {
                    var queryString = actionContext.ControllerContext.Request.RequestUri.ParseQueryString();
                    if (queryString[parameterName] != null)
                    {
                        parameters = queryString[parameterName];
                    }
                }

                var values = parameters.Split(new[] { Separator }, StringSplitOptions.RemoveEmptyEntries)
                    .Select(TypeDescriptor.GetConverter(type).ConvertFromString).ToArray();
                var typedValues = Array.CreateInstance(type, values.Length);
                values.CopyTo(typedValues, 0);
                actionContext.ActionArguments[parameterName] = typedValues;
            }
        }
    }

    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        _ParameterNames.ForEach(parameterName => ProcessArrayInput(actionContext, parameterName));
    }
}

用法:

    [HttpDelete]
    [ArrayInput("tagIDs")]
    [Route("api/v1/files/{fileID}/tags/{tagIDs}")]
    public HttpResponseMessage RemoveFileTags(Guid fileID, Guid[] tagIDs)
    {
        _FileRepository.RemoveFileTags(fileID, tagIDs);
        return Request.CreateResponse(HttpStatusCode.OK);
    }

请求uri

http://localhost/api/v1/files/2a9937c7-8201-59b7-bc8d-11a9178895d0/tags/BBA5CD5D-F07D-47A9-8DEE-D19F5FA65F63,BBA5CD5D-F07D-47A9-8DEE-D19F5FA65F63

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;
    }
}

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。

将方法类型设置为[HttpPost]，创建一个有一个int[]参数的模型，并使用json post:

/* Model */
public class CategoryRequestModel 
{
    public int[] Categories { get; set; }
}

/* WebApi */
[HttpPost]
public HttpResponseMessage GetCategories(CategoryRequestModel model)
{
    HttpResponseMessage resp = null;

    try
    {
        var categories = //your code to get categories

        resp = Request.CreateResponse(HttpStatusCode.OK, categories);

    }
    catch(Exception ex)
    {
        resp = Request.CreateErrorResponse(HttpStatusCode.InternalServerError, ex);
    }

    return resp;
}

/* jQuery */
var ajaxSettings = {
    type: 'POST',
    url: '/Categories',
    data: JSON.serialize({Categories: [1,2,3,4]}),
    contentType: 'application/json',
    success: function(data, textStatus, jqXHR)
    {
        //get categories from data
    }
};

$.ajax(ajaxSettings);