I want to create a form that will create a new item but that will pre-populate some data, espcially the date which I want to be DateTime.Now and eventually link this data with the model, without leaving the option of my user to modify it.

我想创建一个表单来创建一个新项目，但是会预先填充一些数据，特别是我想成为DateTime.Now的日期，并最终将这些数据与模型相关联，而不会让我的用户选择修改它。

So far here's what I have done:

到目前为止，这是我所做的：

@using (Html.BeginForm()) {
{
    var currentDate = DateTime.Now;
    Model.m_OrderDate = currentDate;
}   
@Html.ValidationSummary(true)
(...)
Order Date: @Html.DisplayFor(model => model.m_OrderDate)<br/>

<p>
    <input type="submit" value="Create" />
</p>
</fieldset>

But the app crashes on runtime at the line Model.m_OrderDate = currenDate saying that Object reference is not set to an instance of an object.

但是应用程序在运行时在Model.m_OrderDate = currenDate行崩溃，表示Object引用未设置为对象的实例。

I've looked through for many solutions but have yet to solve it. Can anyone help me? Thanks a lot!

我已经找了很多解决方案，但还没有解决它。谁能帮我？非常感谢！

1 个解决方案

private DateTime? orderDate = null;
public DateTime OrderDate
{
    get { return orderDate ?? DateTime.Now; }
    set { orderDate = value; }
}

public ActionResult MyAwesomeView()
{
    return View(new MyModel());
}