我正在使用asp.mvc 4. Assumend我有一个名为Person的模型字段
public class Person
{
public int ID { get; set; }
public string FirstName { get; set; }
public string SecondName { get; set; }
public DateTime DateOfBirth { get; set; }
public DateTime DateOfWorkstart { get; set; }
public int NumberOfChildren { get; set; }
public int DepartmentID { get; set; }
public virtual Department Department { get; set; }
}
public class Department
{
public int ID { get; set; }
public int NameOfDepartment { get; set; }
}
在我自动生成的剃刀编辑视图字段中显示如下(为清晰起见,我在此帖中仅包含重要行)
@Html.DisplayFor(modelItem => item.FirstName)
@Html.DisplayFor(modelItem => item.SecondName)
现在我想将linq-lambda表达式存储在一个列表中,稍后再使用它,我不知道该怎么做,我需要这样的东西:
@{
string itemsToShow = "namepart"; // this could also be "otherpart"
List <Expression<>> list = new List();
if (itemsToShow.equals("namepart")
{
list.add(modelItem => item.FirstName);
list.add(modelItem => item.SecondName);
}
else
{
list.add(modelItem => item.DateOfBirth);
list.add(modelItem => item.DateOfWorkStart);
list.add(modelItem => item.NumberOfChildren);
}
}
最后我想像这样使用生成的列表
@foreach (var lambda in list)
{
@Html.DisplayFor(lambda)
}
最佳答案 我会为此写一个自定义助手:
public static class HtmlExtensions
{
public static IHtmlString MyHelper(this HtmlHelper<MyViewModel> html, string itemsToShow)
{
var sb = new StringBuilder();
if (itemsToShow == "namepart")
{
sb.Append(html.DisplayFor(x => x.FirstName));
sb.Append(html.DisplayFor(x => x.SecondName));
}
else
{
sb.Append(html.DisplayFor(x => x.DateOfBirth));
sb.Append(html.DisplayFor(x => x.DateOfWorkStart));
sb.Append(html.DisplayFor(x => x.NumberOfChildren));
}
return new HtmlString(sb.ToString());
}
}
然后简单地在视图内:
@Html.MyHelper("namepart")
如果你想渲染其他部分:
@Html.MyHelper("otherpart")
作为替代方案,只需将此内容放入2个不同的局部视图中,然后:
@if (itemsToShow == "namepart")
{
@Html.Partial("_NamePart", Model)
}
else
{
@Html.Partial("_OtherPart", Model)
}