或者，您可以只传递一串分隔项，并将其放入接收端的数组或列表中。

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);

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。

所有其他解决方案都需要大量的工作。我试图在HttpGet方法参数中使用IEnumerable<long>或long[]，但我认为没有必要做所有的工作，只是为了使处理程序方法参数的签名long[]。我最终只是把它变成字符串，然后在处理程序中把它分开。我只说了一句。

public async Task<IActionResult> SomeHandler(string idsString)
{
    var ids = idsString.Split(',').Select(x => long.Parse(x));

现在你可以传递这些数字

.../SomeHandler?idsString=123,456,789,012

我最初使用@Mrchief这个解决方案很多年了(它工作得很好)。但是当我将Swagger添加到我的API文档项目时，我的终点并没有显示出来。

这花了我一段时间，但这是我想到的。它与Swagger一起工作，你的API方法签名看起来更干净:

最后你可以做到:

    // GET: /api/values/1,2,3,4 

    [Route("api/values/{ids}")]
    public IHttpActionResult GetIds(int[] ids)
    {
        return Ok(ids);
    }

WebApiConfig.cs

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Allow WebApi to Use a Custom Parameter Binding
        config.ParameterBindingRules.Add(descriptor => descriptor.ParameterType == typeof(int[]) && descriptor.ActionDescriptor.SupportedHttpMethods.Contains(HttpMethod.Get)
                                                           ? new CommaDelimitedArrayParameterBinder(descriptor)
                                                           : null);

        // Allow ApiExplorer to understand this type (Swagger uses ApiExplorer under the hood)
        TypeDescriptor.AddAttributes(typeof(int[]), new TypeConverterAttribute(typeof(StringToIntArrayConverter)));

        // Any existing Code ..

    }
}

创建一个新类:CommaDelimitedArrayParameterBinder.cs

public class CommaDelimitedArrayParameterBinder : HttpParameterBinding, IValueProviderParameterBinding
{
    public CommaDelimitedArrayParameterBinder(HttpParameterDescriptor desc)
        : base(desc)
    {
    }

    /// <summary>
    /// Handles Binding (Converts a comma delimited string into an array of integers)
    /// </summary>
    public override Task ExecuteBindingAsync(ModelMetadataProvider metadataProvider,
                                             HttpActionContext actionContext,
                                             CancellationToken cancellationToken)
    {
        var queryString = actionContext.ControllerContext.RouteData.Values[Descriptor.ParameterName] as string;

        var ints = queryString?.Split(',').Select(int.Parse).ToArray();

        SetValue(actionContext, ints);

        return Task.CompletedTask;
    }

    public IEnumerable<ValueProviderFactory> ValueProviderFactories { get; } = new[] { new QueryStringValueProviderFactory() };
}

创建一个新类:StringToIntArrayConverter.cs

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

注:

https://stackoverflow.com/a/47123965/862011为我指明了正确的方向 Swagger只是在使用[Route]属性时未能选择我的逗号分隔的端点

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