[英]System.InvalidOperationException when calling WCF Service
[英]System.InvalidOperationException: When submitting a message
我收到上面的錯誤消息。 我看過其他人的問題,似乎無法查明錯誤。 這是我為控制器編寫的代碼。 這是我得到的錯誤:
System.InvalidOperationException:擁有鍵“ RecieverID”的ViewData項的類型為“ System.String”,但必須為類型的“ IEnumerable <SelectListItem>”
public ActionResult Create()
{
ViewBag.RecieverID = new SelectList(db.AspNetUsers, "Id", "Email");
return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "RecieverID,TEXT")] Message message)
{
if (ModelState.IsValid)
{
var mes = new Message
{
SenderID = User.Identity.GetUserId(),
DATETIMEMADE = DateTime.Now,
TEXT = message.TEXT
};
db.Messages.Add(mes);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.ReceiverID = new SelectList(db.AspNetUsers, "Id", "Email", message.RecieverID);
return View(message);
}
之后,這是我創建消息的觀點:
@model MUE.Models.Message
@{
ViewBag.Title = "Create";
}
<h2>Create</h2>
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Message</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.RecieverID, "RecieverID", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("RecieverID", null, htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.RecieverID, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.TEXT, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.TEXT, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.TEXT, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
不知道問題出在哪里,但是任何幫助將不勝感激。
首先,不要成為納粹語法,但應該是“接收者”而不是“接收者”。
其次,model.RecieverID指示單個字段,而不是集合。
“新的SelectList(...)”是集合。
請參考: MVC-設置SelectList的選定值
您可以為頁面創建一個ViewModel,例如:
public class MyViewModel
{
public SelectList ReceiverList
public MUE.Models.Message ReceivedMessage
}
在控制器中分配值,然后執行以下操作:
@Html.DropDownListFor(model => model.ReceivedMessage.ReceiverID, Model.ReceiverList, new { @class = "form-control" })
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