从检索视图数据,我应该使用模型绑定? [英] Retrieving data from view, should I use model binder?
问题描述
我有点丢在这里,因为我还没有真正望着模型粘合剂,所以如果可能的话,可以告诉我,如果我其实想我的问题,正确... :)如果我的code是方式,请指教...
1 - 我有一个包含一个DTO类的自定义字段各自的名称和其他属性即:
公共类CustomFields
{
公共字符串名称{;设置;}
公共字符串描述{获取;设置;}
公共字符串的FieldType {获取;设置;}
公共字符串值{获得;设置;}
}
2 - 在我的回购/业务层我设定值和视图返回的ICollection呈现
3的视图使用一个foreach显示领域
<%的foreach(在型号VAR项){%GT;
< DIV CLASS =编辑标记>
&所述;%= Html.Label(item.Name)%GT;
< / DIV>
< DIV CLASS =主编场>
&所述;%= Html.TextBox(item.Name,item.Value)%GT;
< / DIV>
<%}%GT;
问题:什么是检索通过后的结果的最佳方式?如果有错误,我需要将错误发送回视图...
请注意:我做了什么 - >
[HttpPost]
[ValidateAntiForgeryToken]
公众的ActionResult指数([ModelBinder的(typeof运算(CustomModelBinder))的ICollection< CustomFields>字段)
{
// code这里...
}
自定义模型绑定从形式收集得到的价值观和在转换到正确的类型 - 这是正确的?最好的办法做到这一点?我感觉我过于复杂的事情...
公共类CustomModelBinder:IModelBinder
{
公共对象BindModel(ControllerContext controllerContext,
ModelBindingContext的BindingContext)
{ VAR领域=新的List< CustomFields>(); VAR的FormCollection =新的FormCollection(controllerContext.HttpContext.Request.Form); 的foreach(在字符串的FormCollection _key)
{
如果(_key.Contains(_ RequestVerificationToken))
打破; fields.Add(新CustomFields {名称= _key,
值= formCollection.GetValue(_key).AttemptedValue});
}
返回领域;
}
}
一切都是完美的,直到第3步,你提到foreach循环在视图中。这就是我会停下来使用的编辑器模板来代替。因此,通过更换循环在您的视图:
<%= Html.EditorForModel()%GT;
和将被渲染为模型集合中的每个元素对应的编辑器模板内(〜/查看/共享/ EditorTemplates / CustomFields.ascx
):
< DIV CLASS =编辑标记>
&所述;%= Html.LabelFor(X => x.Name)%GT;
< / DIV>
< DIV CLASS =主编场>
&所述;%= Html.TextBoxFor(X => x.Name)%GT;
< / DIV>
< DIV CLASS =主编场>
&所述;%= Html.TextBoxFor(X => x.Value)%GT;
< / DIV>
< DIV CLASS =主编场>
&所述;%= Html.TextBoxFor(X => x.Description)%GT;
< / DIV>
< DIV CLASS =主编场>
&所述;%= Html.TextBoxFor(X => x.FieldType)%GT;
< / DIV>
后来干脆:
[HttpPost]
[ValidateAntiForgeryToken]
公众的ActionResult指数(IEnumerable的< CustomFields>字段)
{
// code这里...
}
无需任何型号的粘合剂。编辑模板将采取使他们正确绑定生成输入字段专有名词的照顾。
I am a bit lost here as I have not really looked at model binders so if possible, can one advise me if I am actually thinking about my problem correctly... :) and if my code is way of, please advise...
1 -I have a DTO class which contains 'custom fields' each with a name and other properties i.e.:
Public Class CustomFields
{
public string Name {get;set;}
public string Description {get;set;}
public string FieldType {get;set;}
public string Value {get;set;}
}
2- Within my repo/business layer I am setting the values and returning ICollection for the view to render
3- the view uses a foreach to display fields
<% foreach (var item in Model) {%>
<div class="editor-label">
<%= Html.Label(item.Name) %>
</div>
<div class="editor-field">
<%= Html.TextBox(item.Name, item.Value)%>
</div>
<% } %>
Question: What is the best way to retrieve the result via a post? If there are errors I need to send back the errors to the view...
NOTE: What I did-->
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Index([ModelBinder(typeof(CustomModelBinder))] ICollection<CustomFields> Fields)
{
//code here...
}
Custom Model binder gets values from form collection and transforms in into the correct type- is this correct? The best way to do this? I get the feeling I overcomplicated things...
public class CustomModelBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext,
ModelBindingContext bindingContext)
{
var fields = new List<CustomFields>();
var formCollection = new FormCollection(controllerContext.HttpContext.Request.Form);
foreach (string _key in formCollection)
{
if (_key.Contains("_RequestVerificationToken"))
break;
fields.Add(new CustomFields { Name = _key,
Value = formCollection.GetValue(_key).AttemptedValue });
}
return fields;
}
}
Everything is perfect until step 3 where you mention foreach loops in a view. That's where I would stop and use editor templates instead. So replace the loop in your view by:
<%= Html.EditorForModel() %>
and inside the corresponding editor template which will be rendered for each element of the model collection (~/Views/Shared/EditorTemplates/CustomFields.ascx
):
<div class="editor-label">
<%= Html.LabelFor(x => x.Name) %>
</div>
<div class="editor-field">
<%= Html.TextBoxFor(x => x.Name) %>
</div>
<div class="editor-field">
<%= Html.TextBoxFor(x => x.Value) %>
</div>
<div class="editor-field">
<%= Html.TextBoxFor(x => x.Description) %>
</div>
<div class="editor-field">
<%= Html.TextBoxFor(x => x.FieldType) %>
</div>
then simply:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Index(IEnumerable<CustomFields> fields)
{
//code here...
}
No need of any model binders. The editor template will take care of generating proper names for the input fields so that they are correctly bound.
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