将 int 列表传递给 HttpGet 请求 [英] Passing a list of int to a HttpGet request

问题描述

我有一个类似结构的函数:

I have a function similar in structure to this:

[HttpGet]
public HttpResponseMessage GetValuesForList(List<int> listOfIds)
{
    /* create model */        

    foreach(var id in listOfIds)
        model.Add(GetValueForId(id)

    /* create response for model */
    return response;
}

但是，当我对该方法执行 Get 请求时:

However, when I do a Get request for the method:

{{domain}}/Controller/GetValuesForList?listOfIds=1&listOfIds=2

我在调试时收到错误，指出 listOfIds 为空.在我们的控制器中，我们有许多可以正常工作的公共 HttpGet 方法，当将参数更改为单个 int 时，它可以正常工作.我也尝试将参数类型更改为 int[] 和 IEnumerable，但没有更改.

I get an error when debugging stating that listOfIds is null. In our controller we have a number of public HttpGet methods that work fine, and when changing the parameter to a single int it works. I've tried changing the parameter type to int[] and IEnumerable<int> too, but no change.

但是，当更改对 HttpPost 的调用并将列表作为 x-www-form-urlencoded 值传递时，该方法有效.

However, when changing the call to a HttpPost and passing the list as an x-www-form-urlencoded value, the method works.

是否可以将列表传递给 Get 方法，还是必须使用 Post?因为它实际上不是一个 post 方法(因为它返回值的 JSON 模型并且没有任何内容保存到服务器).

Is it possible to pass a list to a Get method, or will I have to use Post? Since it's not actually a post method (as it returns a JSON model of values and nothing is saved to the server).

推荐答案

如果你使用的是 MVC WebAPI，那么你可以像这样声明你的方法:

If you are using MVC WebAPI, then you can declare your method like this:

[HttpGet]
public int GetTotalItemsInArray([FromQuery]int[] listOfIds)
{
       return listOfIds.Length;
}

然后你这样查询:blabla.com/GetTotalItemsInArray?listOfIds=1&listOfIds=2&listOfIds=3

这会将数组 [1, 2, 3] 匹配到 listOfIds 参数中(并按预期返回 3)

this will match array [1, 2, 3] into listOfIds param (and return 3 as expected)

这篇关于将 int 列表传递给 HttpGet 请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！