asp.net-mvc – 在TryUpdateModel之前更新值提供程序

主要问题是我们想要更新值,因此当您更新模型时,它将使用您覆盖的任何内容.我想一个想法是删除值并添加它.当我检查ModelState时,它确实具有更新的值,但是当我调用TryUpdateModel时,该值不会更新.它可能我在下面做的确实是正确的,这里还有另一个问题,但我想我先试试这个.谢谢！

//Sample case:

    [HttpPost]
    public ActionResult Edit(PetOwner petOwner)
    {

    //If pets name is not set,force to "Unknown"
    if(petOwner.PetsName=="")
    {
    //Tried this too ModelState.Remove("PetsName");
    //ModelState.Add("PetsName",new ModelState());
    ModelState["PetsName"].Value = new ValueProviderResult("Unnamed","Unnamed",CultureInfo.CurrentCulture);
    }

    //Get the record/relationships from DB to merge with ModelState
    PetOwner petOwnerToSave = from o in ctx.PetOwners where o.PetOwnerId == petOwner.PetOwnerId select o;

    TryUpdateModel(petOwnerToSave);

    //Save petOwnerToSave
    }