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在模型中具有继承性的ASP核心标记助手

asp.net-core-tag-helpers asp.net-core razor c#

HamedH · 技术社区 · 8 年前

假设我们有这些简化模型:

public class Person {
   public string Address {set;get;}
}

public class Student: Person {
   public float Grade {set;get;}
}
public class Teacher: Person {
   public string Department {set; get;}
}

现在我们想为学生和老师创建一个页面。我的问题是,我们如何利用继承的好处,只为学生和老师创建一个页面?

@model Person

@{
    bool isStudent = Model is Student;
}

<form asp-action="Create">
    <div class="form-horizontal">
    @if (isStudent)
    {
        <div class="form-group">
            <label asp-for="((Student)Model).Grade" class="col-md-2 control-label"></label>
            <div class="col-md-10">
                <input asp-for="((Student)Model).Grade" class="form-control" />
                <span asp-validation-for="((Student)Model).Grade" class="text-danger"></span>
            </div>
        </div>
   } else {
        <div class="form-group">
            <label asp-for="((Teacher)Model).Department" class="col-md-2 control-label"></label>
            <div class="col-md-10">
                <input asp-for="((Teacher)Model).Department" class="form-control" />
                <span asp-validation-for="((Teacher)Model).Department" class="text-danger"></span>
            </div>
        </div>
   }
   <div class="form-group">
         <label asp-for="Address" class="col-md-2 control-label"></label>
         <div class="col-md-10">
             <input asp-for="Address" class="form-control" />
             <span asp-validation-for="Address" class="text-danger"></span>
         </div>
   </div>
   <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-success" />
            </div>
        </div>
    </div>
</form>

但它不允许 asp-for="((Student)Model).Grade"