这看起来非常简单,我确信我在过去没有遇到任何问题,但我有一个模型,其中包含一个int数组:
查看模型
public class ExampleViewModel
{
public int ExampleProperty1 { get; set; }
public int[] ExampleProperty2 = {};
public string ExampleProperty3 { get; set; }
}
现在,我将使用一些数据预加载此视图模型并显示一个表单:
控制器操作
public ViewResult Example1()
{
var viewModel = new ExampleViewModel
{
ExampleProperty1 = 888,
ExampleProperty2 = new [] { 1, 2, 3, 4 },
ExampleProperty3 = "Test string"
};
return View(viewModel);
}
Razor视图
@using (Html.BeginForm("example2", "class", FormMethod.Post, new {id = "ExampleForm"}))
{
@Html.HiddenForEnumerable(m => m.ExampleProperty2)
@Html.TextBoxFor(m => m.ExampleProperty1)
@Html.TextBoxFor(m => m.ExampleProperty3)
<input type="submit"/>
}
“HiddenForEnumerable”扩展方法如下所示:
public static MvcHtmlString HiddenForEnumerable<TModel, TProperty>(this HtmlHelper<TModel> helper,
Expression<Func<TModel, IEnumerable<TProperty>>> expression)
{
var sb = new StringBuilder();
var membername = expression.GetMemberName();
var model = helper.ViewData.Model;
var list = expression.Compile()(model).ToList();
for (var i = 0; i < list.Count(); i++)
{
sb.Append(helper.Hidden(string.Format("{0}[{1}]", membername, i), list.ElementAt(i)));
}
return new MvcHtmlString(sb.ToString());
}
并生成以下HTML:
<input id="ExampleProperty2_0_" name="ExampleProperty2[0]" type="hidden" value="1">
<input id="ExampleProperty2_1_" name="ExampleProperty2[1]" type="hidden" value="2">
<input id="ExampleProperty2_2_" name="ExampleProperty2[2]" type="hidden" value="3">
<input id="ExampleProperty2_3_" name="ExampleProperty2[3]" type="hidden" value="4">
到目前为止,这么好。但是,当我将表单提交给此操作时:
public ViewResult Example2(ExampleViewModel viewModel)
{
return View();
}
int数组为空:
所以问题是:如何让MVC正确检测int数组并将其分配给视图模型?
额外信息
如果它很重要,这就是POST请求正文的样子:
ExampleProperty2%5B0%5D=1&ExampleProperty2%5B1%5D=2&ExampleProperty2%5B2%5D=3&ExampleProperty2%5B3%5D=4&ExampleProperty1=888&ExampleProperty3=Test+string
答案 0 :(得分:5)
您需要将ExampleProperty2
设为属性(使用getter / setter),以便DefaultModelBinder
可以设置属性的值
public class ExampleViewModel
{
public int ExampleProperty1 { get; set; }
public int[] ExampleProperty2 { get; set; } // change this
public string ExampleProperty3 { get; set; }
}