HtmlHelper MVC 5中的System.InvalidOperationException(System.InvalidOperationException inside HtmlHelper MVC 5)

我有一个连续三个元素的CreateGame视图：一个label ，一个dropdownlist和一个用于输入十进制数字的editbox 。

它是这样的：

<div class="form-group"> <div class="col-md-1.5"> @Html.LabelFor(model => model.id1, htmlAttributes: new { @class = "control-label col-md-2" }) </div> <div class="col-md-2"> @Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.id1, "", new { @class = "text-danger" }) </div> <div class="col-md-1"> @Html.EditorFor(model => model.rating_1, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.rating_1, "", new { @class = "text-danger" }) </div> </div>

基本上我想确定哪个玩家（来自下拉列表）玩游戏并给他一定的评分。

现在我有两种不同的场景。 我可以为评级设置一个整数，一切运行顺利，或者我可以输入一个十进制数字（这就是重点），并在此行中抛出System.InvalidOperationException异常：

@Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" })

说明

具有键“id1”的ViewData项的类型为“System.Int32”，但必须是“IEnumerable”类型。

我知道错误消息在说什么，但我不明白rating属性如何改变编译器在上面一行的方式。 如何能够为评级插入十进制数字？

编辑：

顺便说一句，这就是我在控制器上创建ViewBag.Lista ：

var lista = db.Players .Select(p => new SelectListItem { Text = p.name, Value = p.ID.ToString() }).ToList(); ViewBag.Lista = new SelectList(lista, "Value", "Text");

I have my CreateGame View with three elements in a row: a label, a dropdownlist and an editbox to put a decimal number.

It goes like this:

<div class="form-group"> <div class="col-md-1.5"> @Html.LabelFor(model => model.id1, htmlAttributes: new { @class = "control-label col-md-2" }) </div> <div class="col-md-2"> @Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.id1, "", new { @class = "text-danger" }) </div> <div class="col-md-1"> @Html.EditorFor(model => model.rating_1, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.rating_1, "", new { @class = "text-danger" }) </div> </div>

Basically I want to identify which player (from the dropdownlist) played the game and to assign him a certain rating.

Now I have two different scenarios. I can either put an integer number for the rating and everything runs smoothly or I can put a decimal number (that's the point) and a System.InvalidOperationException exception is thrown in this line:

@Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" })

stating

The ViewData item that has the key 'id1' is of type 'System.Int32' but must be of type 'IEnumerable'.

I know what the error message is saying, but I don't understand how can the rating property changes the way the compiler looks at a line above. How can I be able to insert a decimal number for the rating?

EDIT:

Btw, this is how I create my ViewBag.Lista on my controller:

var lista = db.Players .Select(p => new SelectListItem { Text = p.name, Value = p.ID.ToString() }).ToList(); ViewBag.Lista = new SelectList(lista, "Value", "Text");

最满意答案

尝试在你的模型中设置id1 ：

public IEnumerable<SelectListItem> Your_name_list {get; set;}

并在视图中设置此列表：

@Html.DropDownListFor(model => model.id1, model.Your_name_list, htmlAttributes: new { @class = "form-control" })

Try in your model where you have id1 set:

public IEnumerable<SelectListItem> Your_name_list {get; set;}

And in the view set this list:

@Html.DropDownListFor(model => model.id1, model.Your_name_list, htmlAttributes: new { @class = "form-control" })HtmlHelper MVC 5中的System.InvalidOperationException(System.InvalidOperationException inside HtmlHelper MVC 5)

我有一个连续三个元素的CreateGame视图：一个label ，一个dropdownlist和一个用于输入十进制数字的editbox 。

它是这样的：

<div class="form-group"> <div class="col-md-1.5"> @Html.LabelFor(model => model.id1, htmlAttributes: new { @class = "control-label col-md-2" }) </div> <div class="col-md-2"> @Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.id1, "", new { @class = "text-danger" }) </div> <div class="col-md-1"> @Html.EditorFor(model => model.rating_1, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.rating_1, "", new { @class = "text-danger" }) </div> </div>

基本上我想确定哪个玩家（来自下拉列表）玩游戏并给他一定的评分。

现在我有两种不同的场景。 我可以为评级设置一个整数，一切运行顺利，或者我可以输入一个十进制数字（这就是重点），并在此行中抛出System.InvalidOperationException异常：

@Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" })

说明

具有键“id1”的ViewData项的类型为“System.Int32”，但必须是“IEnumerable”类型。

我知道错误消息在说什么，但我不明白rating属性如何改变编译器在上面一行的方式。 如何能够为评级插入十进制数字？

编辑：

顺便说一句，这就是我在控制器上创建ViewBag.Lista ：

var lista = db.Players .Select(p => new SelectListItem { Text = p.name, Value = p.ID.ToString() }).ToList(); ViewBag.Lista = new SelectList(lista, "Value", "Text");

I have my CreateGame View with three elements in a row: a label, a dropdownlist and an editbox to put a decimal number.

It goes like this:

<div class="form-group"> <div class="col-md-1.5"> @Html.LabelFor(model => model.id1, htmlAttributes: new { @class = "control-label col-md-2" }) </div> <div class="col-md-2"> @Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.id1, "", new { @class = "text-danger" }) </div> <div class="col-md-1"> @Html.EditorFor(model => model.rating_1, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.rating_1, "", new { @class = "text-danger" }) </div> </div>

Basically I want to identify which player (from the dropdownlist) played the game and to assign him a certain rating.

Now I have two different scenarios. I can either put an integer number for the rating and everything runs smoothly or I can put a decimal number (that's the point) and a System.InvalidOperationException exception is thrown in this line:

@Html.DropDownListFor(model => model.id1, (SelectList)ViewBag.Lista, htmlAttributes: new { @class = "form-control" })

stating

The ViewData item that has the key 'id1' is of type 'System.Int32' but must be of type 'IEnumerable'.

I know what the error message is saying, but I don't understand how can the rating property changes the way the compiler looks at a line above. How can I be able to insert a decimal number for the rating?

EDIT:

Btw, this is how I create my ViewBag.Lista on my controller:

var lista = db.Players .Select(p => new SelectListItem { Text = p.name, Value = p.ID.ToString() }).ToList(); ViewBag.Lista = new SelectList(lista, "Value", "Text");

最满意答案

尝试在你的模型中设置id1 ：

public IEnumerable<SelectListItem> Your_name_list {get; set;}

并在视图中设置此列表：

@Html.DropDownListFor(model => model.id1, model.Your_name_list, htmlAttributes: new { @class = "form-control" })

Try in your model where you have id1 set:

public IEnumerable<SelectListItem> Your_name_list {get; set;}

And in the view set this list:

@Html.DropDownListFor(model => model.id1, model.Your_name_list, htmlAttributes: new { @class = "form-control" })