如何接受数组作为 ASP.NET MVC 控制器操作参数? [英] How do I accept an array as an ASP.NET MVC controller action parameter?

问题描述

我有一个名为 Designs 的 ASP.net MVC 控制器，它有一个具有以下签名的操作:

I have an ASP.net MVC controller called Designs that has an action with the following signature:

public ActionResult Multiple(int[] ids)

但是，当我尝试使用 url 导航到此操作时:

However, when I try to navigate to this action using the url:

http://localhost:54119/Designs/Multiple?ids=24041,24117

ids 参数始终为空.有什么方法可以让 MVC 将 ?ids= URL 查询参数转换为操作的数组?我已经看到过使用操作过滤器的讨论，但据我所知，它仅适用于在请求数据中传递数组而不是在 URL 本身中传递的 POST.

The ids parameter is always null. Is there any way to get MVC to convert the ?ids= URL query parameter into an array for the action? I've seen talk of using an action filter but as far as I can tell that will only work for POSTs where the array is passed in the request data rather than in the URL itself.

推荐答案

默认的模型绑定器需要这个 url:

The default model binder expects this url:

http://localhost:54119/Designs/Multiple?ids=24041&ids=24117

为了成功绑定到:

public ActionResult Multiple(int[] ids)
{
    ...
}

如果您希望它与逗号分隔值一起使用，您可以编写自定义模型绑定器:

And if you want this to work with comma separated values you could write a custom model binder:

public class IntArrayModelBinder : DefaultModelBinder
{
    public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
    {
        var value = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
        if (value == null || string.IsNullOrEmpty(value.AttemptedValue))
        {
            return null;
        }

        return value
            .AttemptedValue
            .Split(',')
            .Select(int.Parse)
            .ToArray();
    }
}

然后您可以将此模型绑定器应用于特定的操作参数:

and then you could apply this model binder to a particular action argument:

public ActionResult Multiple([ModelBinder(typeof(IntArrayModelBinder))] int[] ids)
{
    ...
}

或将其全局应用于 Global.asax 中的 Application_Start 中的所有整数数组参数:

or apply it globally to all integer array parameters in your Application_Start in Global.asax:

ModelBinders.Binders.Add(typeof(int[]), new IntArrayModelBinder());

现在您的控制器操作可能如下所示:

and now your controller action might look like this:

public ActionResult Multiple(int[] ids)
{
    ...
}

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