ASPNET MVC - 为什么ModelState.IsValid假＆QUOT; X字段是必需的＆QUOT;当该字段具有值？ [英] ASPNET MVC - Why is ModelState.IsValid false "The x field is required" when that field does have a value?
问题描述
我有这样一个模型：
public PurchaseOrder
{
[Required] [StringLength(15)]
public virtual string OrderNumber {get;set;}
// etc.
}
当我从视图中提交订单（使用$。员额，不输入类型=提交），它进入我的控制器类：
When I submit an order from the view (using $.post, not input type=submit) it goes to my controller class:
public class PurchaseOrderController
{
public JsonResult Save(PurchaseOrder order)
{
// TryUpdateModel(order); // commented out since modelstate.isvalid remains false anyway
if (ModelState.IsValid)
{
// its never valid
}
}
}
ModelState.IsValid总是返回false，出现错误：是必需的订单号场。但是有一个值，在这个领域（为什么？）
ModelState.IsValid always returns false, with the error: "The Order Number field is required." But there is a value in this field (?? why)
为什么它会说：值是必需的，当它的确具有价值？我错过了什么？是不是因为.post的$，而不是提交？我该怎么办？
Why would it say "value is required" when it does have a value? Have I missed something? Is it because of the $.post instead of the submit? What can I do?
这是调试器是什么样子：
This is what the debugger looks like:
编辑：额外的信息....
我真的认为，由于某种原因，模型绑定没有发生。当我尝试这个code在这里找到：）
I really think that for some reason the model binding is not happening. When I try this code found here: )
if (!ModelState.IsValid)
{
ModelState.Clear();
ModelMetadata modelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => order, order.GetType());
ModelValidator compositeValidator = ModelValidator.GetModelValidator(modelMetadata, base.ControllerContext);
foreach (ModelValidationResult result in compositeValidator.Validate(null))
{
this.ModelState.AddModelError(result.MemberName, result.Message);
}
}
然后ModelState.IsValid = TRUE。 compositeValidator.Validate（）返回0错误。我认为这表明该模型是不绑定的，但我仍然不知道为什么。
Then ModelState.IsValid = true. compositeValidator.Validate() returns 0 errors. I think this indicates the model was not bound, but I still don't know why.
控制器方法实际上看起来像这样（我错过了过滤器时，最初写这个问题）
The controller method actually looks like this (I missed out the filter when originally writing this question)
[JsonFilter(Param = "order", JsonDataType = typeof(PurchaseOrder))]
public JsonResult Save(PurchaseOrder order) { // etc ... }
而JsonFilter并从JSON数据提交此提取POCO：
And the JsonFilter does this to extract the POCO from the json submitted data:
filterContext.ActionParameters[Param]
= jsSerializer.Deserialize(inputContent, JsonDataType);
我把一个断点在这条线上，和秩序是有效的，再加上order.OrderNumber有正确的值。
I put a breakpoint on this line, and order is valid, plus order.OrderNumber has the correct value.
所以仍然没有得到解决，但希望这额外的信息将会找到一个解决方案帮助
So still unresolved, but hopefully this extra info will help with finding a solution
推荐答案
好吧，我已经解决了，但我真的不明白，为什么我的变化作出都有帮助。
Well I have "solved" it, but I do not really understand why the changes I made have helped.
我必须做三件事：
-
删除JSON过滤器（过滤器不绑定）
Remove the json filter (filters don't bind)
更改的contentType为application / JSON
Change the contentType to application/json
$。ajaxSetup（{
的contentType：应用/ JSON的;字符集= UTF-8
}）;
$.ajaxSetup({ contentType: "application/json; charset=utf-8" });
使用的MVC期货作为这里描述下载Microsoft.Mvc.dll：<一href=\"http://haacked.com/archive/2010/04/15/sending-json-to-an-asp-net-mvc-action-method-argument.aspx\" rel=\"nofollow\">http://haacked.com/archive/2010/04/15/sending-json-to-an-asp-net-mvc-action-method-argument.aspx.哪里是说把它添加到的Application_Start（）在Global.asax.cs中：
Use the MVC futures download Microsoft.Mvc.dll as described here: http://haacked.com/archive/2010/04/15/sending-json-to-an-asp-net-mvc-action-method-argument.aspx. Where is says to add this to Application_Start() in Global.asax.cs:
ValueProviderFactories.Factories.Add（新JsonValueProviderFactory（））;
ValueProviderFactories.Factories.Add(new JsonValueProviderFactory());
现在我不知道为什么已经工作，但它有。
Now I dont know exactly why that has worked, but it has.
不幸的是，已经有一个负面效应：contentType为适用于所有$。获得（）和$。员额（）方法，并打破了我的所有jqgrids - 他们似乎只是工作，如果内容类型是默认应用程序/ x-WWW的形式urlen codeD
Unfortunately it has had a negative side effect: the contenttype is applied to all $.get() and $.post() methods, and broken all my jqgrids - they only seem to work if the content type is the default of application/x-www-form-urlencoded
于是我问2后续的问题：
So I've asked 2 follow on questions:
-
是否有可能设置在.post的$内容类型（）调用？然后，我就不需要全局设置它
<一href=\"http://stackoverflow.com/questions/2845459/jquery-how-to-make-post-use-contenttypeapplication-json\">http://stackoverflow.com/questions/2845459/jquery-how-to-make-post-use-contenttypeapplication-json
时，有可能使jqrid的工作，如果contentType为application / JSON？
<一href=\"http://stackoverflow.com/questions/2845459/jquery-how-to-make-post-use-contenttypeapplication-json\">http://stackoverflow.com/questions/2845459/jquery-how-to-make-post-use-contenttypeapplication-json
Is it possible to make jqrid work if the contenttype is application/json? http://stackoverflow.com/questions/2845459/jquery-how-to-make-post-use-contenttypeapplication-json
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