我使用視圖模型。我不創建數據模型實例,直到視圖模型有效。 下面是一個簡單的例子。請注意,某些屬性的數據模型,但驗證屬性只有在這個視圖模型存在(基本是不相關的在這裏)
public class ProblemAddToDepartmentProductView : ViewModel
{
public Problem Problem { get; set; }
public IList<Product> AllProducts { get; set; }
public IList<Department> AllDepartments { get; set; }
public string ProblemId { get; set; }
public string ProblemName { get; set; }
[DisplayName("Choose the product:")]
[Required(ErrorMessage = "Select the Product.")]
public string SelectedProduct { get; set; }
public SelectList GetProducts()
{
var selectList = new SelectList(AllProducts, "Id", "Name");
return selectList;
}
[DisplayName("Choose the department using this problem for that product:")]
[Required(ErrorMessage = "Select the Department.")]
public string SelectedDepartment { get; set; }
public SelectList GetDepartments()
{
var selectList = new SelectList(AllDepartments, "Id", "Name");
return selectList;
}
internal class ProductSelect
{
public Guid Id { get; set; }
public string Name { get; set; }
}
}
這也將有助於看到它的有線頁面上。
<fieldset>
<legend>Fields</legend>
<div class="editor-label">
<%= Html.LabelFor(x => x.SelectedProduct) %>
</div>
<div class="editor-field">
<%= Html.DropDownListFor(x => x.SelectedProduct, Model.GetProducts(),"--Select One--") %>
<%= Html.ValidationMessageFor(x => x.SelectedProduct)%>
</div>
<div class="editor-label">
<%= Html.LabelFor(x => x.SelectedDepartment) %>
</div>
<div class="editor-field">
<%= Html.DropDownListFor(x => x.SelectedDepartment, Model.GetDepartments(),"--Select One--") %>
<%= Html.ValidationMessageFor(x => x.SelectedDepartment)%>
</div>
<p>
<input type="submit" value="Add Selected" />
</p>
</fieldset>
我也這樣做,所以如果驗證失敗的車型將擁有這些價值觀,拉回到了所需的數據的下拉菜單:
p.ProblemId)%>
< %= Html.HiddenFor(p => p.ProblemName)%>