ASP.NET MVC DefaultModelBinder与嵌套列表 [英] ASP.NET MVC DefaultModelBinder with nested lists

问题描述

我有一个表重新presenting员工的时间表视图。跨顶天，项目下侧，与含定期时间和加班时间两个值的每一天/项目交集。

I have a View with a table representing an employee's timesheet. Days across the top, projects down the side, with each day/project intersection containing two values for regular hours and overtime.

在页面模型（简体）类定义​​是：

The (simplified) class definitions for the page model are:

public class TimesheetFormModel {
    public List<Project> Projects;
    // other things...
}
public class Project {
    public string Name;
    public List<WorkUnit> WorkUnits;
}
public class WorkUnit {
    public DateTime Date;
    public decimal RegularHours;
    public decimal OvertimeHours;
}

页面上的表单元素被命名为试图获得DefaultModelBinder拿起他们如下：

The form elements on the page are named as follows in an attempt to get the DefaultModelBinder to pick up on them.

model.Projects[0].Name // "New Project"
model.Projects[0].WorkUnits[0].Date // "5/23/2009 12:00:00 AM"
model.Projects[0].WorkUnits[0].RegularHours // 0
model.Projects[0].WorkUnits[0].OvertimeHours // 0

model.Projects[0].WorkUnits[1].Date // "5/24/2009 12:00:00 AM"
model.Projects[0].WorkUnits[1].RegularHours // 0
model.Projects[0].WorkUnits[1].OvertimeHours // 0

model.Projects[0].WorkUnits[2].Date // "5/25/2009 12:00:00 AM"
model.Projects[0].WorkUnits[2].RegularHours // 0
model.Projects[0].WorkUnits[2].OvertimeHours // 0

// etc.

在该视图但是提交后，模式参数没有被完全填充。 model.Projects 包含的项目，但项目的工作单元字段为空。请问 DefaultModelBinder 支持嵌套集合像我想干什么？如果不是这样，我该怎么办？

When the view is submitted however, the model parameter isn't being completely populated. model.Projects contains projects, but the Project's WorkUnits field is empty. Does the DefaultModelBinder support nested collections like I'm trying to do? If not, what should I do?

推荐答案

我终于想通了，为什么 DefaultModelBinder 上的性能并没有拿起 WorkUnit的：因为他们没有的属性，他们的字段。 DefaultModelBinder 只适用于属性。更改的类定义 WorkUnit的和项目使用领域取得的一切点击：

I eventually figured out why DefaultModelBinder wasn't picking up on the properties of WorkUnit: Because they weren't properties, they were fields. DefaultModelBinder only works with properties. Changing the class definition of WorkUnit and Project to use fields made everything click:

public class Project {
    public IList<WorkUnit> WorkUnits { get; set; }
    public string Name { get; set; }
}

public class WorkUnit {
    public DateTime Date { get; set; }
    public decimal RegularHours { get; set; }
    public decimal OvertimeHours { get; set; }
}

（注意：在原来的问题源$ C ​​$ C的Project.Name定义为字段，在我的实际code，这是一个属性这是为什么项目名单得到填充，但工作单元WASN吨。）

(Note: The source code in the original question had Project.Name defined as a field, in my actual code it was a property. This is why the Projects list was getting populated but WorkUnits wasn't.)

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