C# MVC 4 控制器 JsonResult
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MVC 4 Controller JsonResult
提问by Stefan v.d Laarschot
I have a question related to my controller in MVC.
I want to loop inside my JsonResult GetAfmeldingenusing foreach.
我有一个与 MVC 中的控制器相关的问题。我想GetAfmeldingen使用 foreach在我的 JsonResult 中循环。
But what I do will not go inside my foreach here is my code as it looks right now
但是我所做的不会进入我的 foreach 这里是我现在看起来的代码
public JsonResult GetJsonAfmeldingen()
{
if (Functions.HasLoginCookie())
{
if (Models.Taken.ActID > 0)
{
foreach (var item in Talent.Afmelding.Fetch(null, Models.Taken.ActID, null, null))
{
return Json(item.Participant.CompleteName, JsonRequestBehavior.AllowGet);
}
return Json("Empty ?? ID = " + Models.Taken.ActID + "", JsonRequestBehavior.AllowGet);
}
else
{
return Json(null, JsonRequestBehavior.AllowGet);
}
}
else
{
return Json(null, JsonRequestBehavior.AllowGet);
}
}
In this example, I return a JsonResultwhen the first record in my list hits. I've looked to see if it works but it doesn't. The id is filled but what am I missing here?
I am new to MVC.
在此示例中，JsonResult当我的列表中的第一条记录命中时，我返回 a 。我已经看了看它是否有效，但没有。id 已填写，但我在这里缺少什么？我是 MVC 的新手。
采纳答案by Nick N.
This is probably what doesn't work, since you cannot come into the foreach.
这可能是行不通的，因为您无法进入 foreach。
public JsonResult GetJsonAfmeldingen()
{
if (Functions.HasLoginCookie())
{
//This one is probably not filled.
if (Models.Taken.ActID > 0)
{
This could be a possible solution:
这可能是一个可能的解决方案：
public JsonResult GetJsonAfmeldingen(int actID)
{
if (Functions.HasLoginCookie())
{
//Now it is filled if you post it correctly.
if (actID > 0)
{
After that try to test it in a smaller scope. Try to have a breakpoint on this line and see if the list is filled.
之后尝试在较小的范围内对其进行测试。尝试在这一行设置一个断点，看看列表是否已填满。
var listAfmeldingen = Talent.Afmelding.Fetch(null, Models.Taken.ActID, null, null);
//Breakpoint here
int count = listAfmeldingen.Count;
foreach (var item in listAfmeldingen)
{
return Json(item.Participant.CompleteName, JsonRequestBehavior.AllowGet);
}
Have a look at your routing as well, I use this one:
也看看你的路由，我用这个：
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
回答by Robert McKee
This will terminate on the first loop of the foreach, is that what you want?
这将在 foreach 的第一个循环中终止，这是您想要的吗？
foreach (var item in Talent.Afmelding.Fetch(null, Models.Taken.ActID, null, null))
{
return Json(item.Participant.CompleteName, JsonRequestBehavior.AllowGet);
}
