在MVC视图模型空引用异常 [英] Model Null reference exception in mvc view
问题描述
从控制器传递数据时查看的问题越来越空引用异常
The problem is getting null reference exception when passing data from controller to view
我传递一个模型视图从控制器是这样的:
I am Passing a model to the view from the controller like this:
{
ViewBag.PartId = id;
var viewmodel= new Orderviewmodelnew();
var order = new OrderMnagernew().GetSingleOrderField(id);
viewmodel.ProjectId=order.ProjectId;
return View(viewmodel);
}
和在视图我有code这样的
And in the View I have code like this
@model DreamTrade.Web.BL.ViewModels.OrderViewModelnew
Home>Project @Model.ProjectID==null??//projected is of type guid
Customer :@(Model.CreatedBy??string.empty)
Project :@Model.ProjectID
@Model.ProjectDetail
CreatedBy:@Model.CreatedBy
Creation Date:@Model.CreationDate
CompletedBy :@Model.ModifiedBy
Completion Date:@Model.LastModified
@Model.Image
@Html.Action("OrderIndex", "Ordernew", new { PartId = Guid.Parse("C0497A40-2ADE-4B23-BA9F-1694F087C3D0") })
我已经试过像这样
I have Tried like this
@if(Model.ProjectId==Null)
{/....}
在控制器我试图像这样通过不传递模型,如果它是空
In the controller i tried like this by not passing model if it is null
var order = new OrderMnagernew().GetSingleOrderField(id);
if(order!=null)
{
viewmodel.ProjectId=order.ProjectId;
return View(viewmodel);
}
return View()
这个在视图中专案编号是显示异常的问题。
The problem with this the projectid in the view is showing exception.
我要显示空字符串,如果它是空,并显示剩余的部分。
I Want to display empty string if it is null and show the remaining part..
推荐答案
这code是错误的:
@Model.ProjectID==null??string.empty
如果专案编号
是可空类型,你应该写:
if ProjectID
is nullable type, you should write:
@(Model.ProjectID ?? string.empty)
补充:
替换为:
return View()
与
return View(new Orderviewmodelnew())
由于空
对象没有任何属性。
because null
object doesn't have any properties
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