如何接受一个数组作为一个ASP.NET MVC控制器操作的参数？ [英] How do I accept an array as an ASP.NET MVC controller action parameter?

问题描述

我有一个名为外观设计的ASP.net MVC控制器，具有以下签名的动作：

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

public ActionResult Multiple(int[] ids)

然而，当我尝试使用url导航到这个动作：

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

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

的ID参数总是空。有没有什么办法让MVC的？IDS = URL查询参数转换成行动的阵列？我见过使用动作过滤器，但据我可以告诉大家，将只对其中数组中请求数据，而不是在URL中传递的POST工作的说法。

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

默认模型联预计，网址：

The default model binder expects this url:

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

为了成功地绑定到：

in order to successfully bind to:

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

如果你想这与逗号分隔值工作，你可以写一个自定义的模型绑定：

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();
    }
}

然后你可以这个模型粘合剂适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)
{
    ...
}

或全局应用到所有整数数组参数在的Application_Start 的Global.asax ：

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

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

现在你的控制器动作可能是这样的：

and now your controller action might look like this:

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

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