[英]Passing an array to an MVC controller
I would like to pass an array of IDs to a controller. 我想将ID数组传递给控制器。 Originally I was adding each ID in the query string like so:
最初,我是在查询字符串中添加每个ID,如下所示:
http://localhost:4000/customers/active?customerId=1&customerId=2&customerId=3 http:// localhost:4000 / customers / active?customerId = 1&customerId = 2&customerId = 3
Then on the controller side I had a method that would accept the array like this: 然后在控制器端,我有一个方法可以接受这样的数组:
GetCustomers([FromQuery] int[] ids)
{
...
}
This was working well but there are a few situations where there are so many customerIds
in the array that the query string became too long so I had to modify the way that the query was being passed to this: 这很好用,但是在某些情况下,数组中有太多
customerIds
,以致查询字符串变得太长,因此我不得不修改将查询传递给此方法的方式:
http://localhost:4000/customers/active?customerIds=1,2,3 http:// localhost:4000 / customers / active?customerIds = 1,2,3
I got the solution working by changing GetCustomers
params to accept a string instead of an int array and then parsed the customerIds
out in the controller (using .Split(',')
) 我通过将
GetCustomers
参数更改为接受字符串而不是int数组,然后在控制器中解析出customerIds
(使用.Split(',')
)来使解决方案起作用。
I feel like it was cleaner to pass an array directly instead of having to modify the string on the server side. 我觉得直接传递数组而不需要在服务器端修改字符串是比较干净的方法。 Is there a way to achieve this given the way the
customerIds
are now being passed? 考虑到现在传递
customerIds
的方式,有没有办法实现这一目标?
1. USE POST 1.使用帖子
2. USE AJAX & SEND DATA AS JSON 2.使用AJAX和发送数据作为JSON
$.ajax({
type: "POST",
url: "/Home/GetCustomers",
data : { stringOfCustomerIds : JSON.stringify(arrCustomerIds)},
dataType: "json",
success: function (response) {
//do something with the response
}
& on the controller side &在控制器端
public JsonResult GetCustomers(string stringOfCustomerIds )
{
JObject CustomerIdsJson = JObject.Parse(listOfCustomerIds );
foreach (JProperty property in CustomerIdsJson .Properties())
{
Console.WriteLine(property.ID+ " - " + property.Value);
}
return Json(output, JsonRequestBehavior.AllowGet);
}
Based on your use of the [FromQuery]
attribute, I can tell that you are using .NET Core (which this only applies to). 根据您对
[FromQuery]
属性的使用,可以看出您正在使用.NET Core(这仅适用于此)。 [FromQuery]
has no way of knowing which part of the query string you want to map to the parameter, so you have to provide a Name
parameter like this: [FromQuery]
无法知道要映射到参数的查询字符串的哪一部分,因此您必须提供一个Name
参数,如下所示:
[FromQuery(Name ="ids")]
The Name
parameter can have whatever value you'd like. Name
参数可以具有您想要的任何值。 Just as long as your query matches the name you select. 只要您的查询与您选择的名称匹配即可。 So for the example above:
因此,对于上面的示例:
?ids=2&ids=3&ids=4
but if you were to formulate the attribute like ?ids=2&ids=3&ids=4
但是如果要像
[FromQuery(Name = "kittens")]
then you would need to make your query look like [FromQuery(Name = "kittens")]
那么您需要使查询看起来像
?kittens=2&kittens=3&kittens=4
Following this methodology you'll be able to see that your parameter is populated correctly. 按照这种方法,您将可以看到您的参数已正确填充。
You could pass the IDs as a JSON object in the body of the message using a POST request on the front end and the [FromBody]
tag on the back end controller. 您可以使用前端的POST请求和后端控制器的
[FromBody]
标签将ID作为JSON对象传递到消息的正文中。 This way your url will simply look like this: http://localhost:4000/customers/active
no matter how many IDs are present in the body of the message. 这样,无论邮件正文中有多少个ID,您的URL都将看起来像这样:
http://localhost:4000/customers/active
。 It also saves you the hassle of extracting and pushing each parameter into a new array element. 这也免除了您提取每个参数并将其推入新数组元素的麻烦。
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