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下面,初始加載(編輯),一切都顯示正常。然而,當我POST(下面的動作)時,它看起來像它,並試圖分別抓住ProductAttribute模型,與產品的ID,並立即失敗。如何讓我的Binder實現不嘗試將集合重新綁定爲單獨的實體?ModelBinder NHibernate複雜對象與集合
謝謝!
型號
public class Product {
virtual public long Id { get; set; }
virtual public string Name { get; set; }
private IList<ProductAttribute> _productAttributes;
public virtual IList<ProductAttribute> ProductAttributes {
get{
if(_productAttributes == null){
_productAttributes = new List<ProductAttribute>();
}
return _productAttributes;
}
set{
_productAttributes = value;
}
}
}
查看
<%using (Html.BeginForm(new {id = Model.Id > 0 ? (long?)Model.Id : null})) {%>
<table class="form">
<% for(var i=0; i < Model.ProductAttributes.Count; i++){
var pa = Model.ProductAttributes[i]; %>
<tr>
<th><%: Model.ProductAttributes[i].Name %></th>
<td>
<%: Html.Hidden("ProductAttributes.Index", i) %>
<% if(pa.CanSpecifyValueDirectly()){ %>
<%: Html.TextBoxFor(model => model.ProductAttributes[i].Value) %>
<% } else { %>
<%: Html.DropDownListFor(model => model.ProductAttributes[i].Value, new SelectList(pa.MarketAttribute.AttributeLevels, "id", "Name", pa.AttributeLevel)) %>
<% } %>
</td>
</tr>
<input type="submit" value="Save" />
</table>
<%}%>
控制器
public ActionResult Edit(long id, Product product) {
ViewData.Model = product;
if (ModelState.IsValid) {
var results = product.Update();
ViewData["results"] = results;
if (!results.Error) {
return RedirectToAction("Show", new { id = id });
}
}
return View();
}
粘結劑
public class StackModelBinder : DefaultModelBinder {
protected override object CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) {
var modelInterface = modelType.GetInterface("IModel");
if (modelInterface == null) {
return base.CreateModel(controllerContext, bindingContext, modelType);
}
var value = bindingContext.ValueProvider.GetValue("id").RawValue.ToString();
if (string.IsNullOrEmpty(value)) {
return base.CreateModel(controllerContext, bindingContext, modelType);
}
var id = Convert.ChangeType(value, typeof (long));
var assembly = Assembly.GetAssembly(modelType);
var dao = assembly.GetType(string.Concat(assembly.GetName().Name, ".core.GlobalDao`1[", modelType.FullName, "]"));
if (dao == null) {
return base.CreateModel(controllerContext, bindingContext, modelType);
}
var method = dao.GetMethod("Get");
return method.Invoke(null, new[] {id});
}
}
爲了DRY的利益,我不得不維護兩個本質上代表同一事物的對象。其他解決方案? – hoffmanc 2010-09-06 14:49:19
哦,我覺得你乾旱。除了它不是一回事 - 一個負責將數據帶入控制器,另一個負責作爲您的域實體。認爲CQRS沒有重複的代碼。 – 2010-09-06 19:01:09