使用语句后无法访问@Viewbag属性

时间：2017-06-05 11:47:48

标签： asp.net asp.net-mvc

在@using（html.BeginForm）语句之后，视图不再访问@ViewBag，我也不知道原因。我收到错误＆＃34;名称＆＃39; ViewBag＆＃39;在当前上下文中不存在＆＃34;。这是为什么？任何帮助，将不胜感激。 

@{ Layout = null; }

@model IEnumerable<ReportViewModel>
<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <link href="StyleSheets/css" rel="stylesheet" />
    <link rel="stylesheet" type="text/css" href="~/StyleSheets/css" />
    <link rel="stylesheet" type="text/css" href="~/StyleSheets/css" />


    <script src="@Url.Content("~/Js/utills.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Js/jQuery/jquery-1.11.0.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Js/rt.js")" type="text/javascript"></script>

    <title>@ViewBag.title</title>


</head>
<body>

    @*@if ((ViewBag.site != "Sites" && ViewBag.site != null) || ViewBag.site != "PrintThis")
        {*@
    @using (Html.BeginForm(null, null, FormMethod.Post, new { id = "ReportForm" }))
        {
            if (@ViewBag.print != "PrintReport")
            {
            <div class="im-row im-padding-4 im-padding-top-16" id="Header" style="width: 100%;">

                <div class="im-container" style="width: 95%;">

                    <div class="im-col--3">
                        @Html.DropDownList(
                                 "OrderSelector",
                                 new SelectList(new[]
                                 {
                                     new SelectListItem {Text = "L", Value = @Url.Action("Pdf", "Report/", new {SecurityCode = @ViewData["SCode"], site = @ViewBag.site, team = @ViewBag.team, sortOrder = "L"})},
                                     new SelectListItem {Text = "R", Value = @Url.Action("Pdf", "Report/", new {SecurityCode = @ViewData["SCode"], site = @ViewBag.site, team = @ViewBag.team, sortOrder = "R"})},
                                     new SelectListItem {Text = "D", Value = @Url.Action("Pdf", "Report/", new {SecurityCode = @ViewData["SCode"], site = @ViewBag.site, team = @ViewBag.team, sortOrder = "D"})},
                                     new SelectListItem {Text = "T", Value = @Url.Action("tPdf", "Report/", new {SecurityCode = @ViewData["SCode"], site = @ViewBag.site, team = @ViewBag.team, sortOrder = "T"})},
                                 }, "Value", "Text"),
                                 new { id = "OrderSelector", @class = "sortOrder", onchange = "CallChangeFunc(this.value)" }
                                 )
                        <input id="SCode" type="hidden" value="@ViewData["SCode"]" />
                        <input id="SelectedSort" type="hidden" value="@ViewBag.sortOrder" />
                    </div>
                    <div class="im-col--5" style="margin-top: 15px;">
                        <span>(to change your default sort preference, click on the 'Settings' tab)</span>
                    </div>
                    <div class="im-col--2">
                        @Html.ActionLink("Print", "Print", "Report", new { site = @ViewBag.site, team = @ViewBag.team, sortOrder = @ViewBag.sortOrder }, new { @class = "im-btn im-btn--primary im-btn--sm printBtn", id = "PrintPdf" })
                    </div>

                    <div class="im-row im-padding-4  im-col--12" style="width: 100%;">
                        <div class="im-container">
                            <hr />
                        </div>
                    </div>
                </div>
            </div>
        }
    }
    <div class="im-container Report im-no-padding-left" style="width: 95%;" id="Report">
        <div class="im-row title">
            <div class="im-col--6 im-no-padding-left">
                <p class="im-text--extra-bold-weight inline">
                    CC
                </p>
                <p class="inline">
                    - @ViewBag.status, @ViewBag.site, @ViewBag.team, @ViewBag.user
                </p>
            </div>
            <div class="im-col--6">
                <p class="im-text--extra-bold-weight inline">
                    @{ string[] currentDate = DateTime.Now.ToString("g").Split(' ');}
                    @currentDate[0] at @currentDate[1]
                </p>
                <p class="im-float--right im-text--color-grey im-text--extra-bold-weight inline">
                    @Model.Count() Rat(s)
                </p>
            </div>

        </div>

1 个答案:

答案 0 :(得分：1)

您应该删除@声明中的if字符。因为@用于指定剃刀中的C＃代码。但是，如果您启动类似if语句的C＃代码，则不应再次使用@字符。像这样：

if (ViewBag.print != "PrintReport")
{
...

}

但如果您的声明嵌套在HTML代码中，则应使用if启动@声明。例如：

<div class="im-container" style="width: 95%;">
     @if(ViewBag.print != "PrintReport")
     {
       ...
     }
     <div class="im-col--3">
     </div>
</div>
  

视图后不再访问@ViewBag   @using（html.BeginForm）声明，我不知道为什么。

因为您刚刚使用了C＃代码：

@using (Html.BeginForm(null, null, FormMethod.Post, new { id = "ReportForm" }))
{
if (ViewBag.print != "PrintReport")
        {

您现在没有添加HTML代码。因此，它让您相信您正在使用C＃代码。但是，如果您开始添加HTML代码，它会实现HTML代码，之后您应该在添加新的C＃代码之前添加@。

因此，您不必在C＃语句中使用@，但必须在将C＃代码嵌套在HTML代码中的地方使用它。像这样：

<p class="inline">
     - @ViewBag.status, @ViewBag.site, @ViewBag.team, @ViewBag.user
</p>

最后，对于您的代码示例，您应该更改它：

<body>
    @*@if ((ViewBag.site != "Sites" && ViewBag.site != null) || ViewBag.site != "PrintThis")
        {*@
    @using (Html.BeginForm(null, null, FormMethod.Post, new { id = "ReportForm" }))
    {
        if (@ViewBag.print != "PrintReport")
        {
            <div class="im-row im-padding-4 im-padding-top-16" id="Header" style="width: 100%;">

                <div class="im-container" style="width: 95%;">

                    <div class="im-col--3">
                        @Html.DropDownList(
                                 "OrderSelector",
                                 new SelectList(new[]
                                 {
                                     new SelectListItem {Text = "L", Value = Url.Action("Pdf", "Report/", new {SecurityCode = ViewData["SCode"], site = ViewBag.site, team = ViewBag.team, sortOrder = "L"})},
                                     new SelectListItem {Text = "R", Value = Url.Action("Pdf", "Report/", new {SecurityCode = ViewData["SCode"], site = ViewBag.site, team = ViewBag.team, sortOrder = "R"})},
                                     new SelectListItem {Text = "D", Value = Url.Action("Pdf", "Report/", new {SecurityCode = ViewData["SCode"], site = ViewBag.site, team = ViewBag.team, sortOrder = "D"})},
                                     new SelectListItem {Text = "T", Value = Url.Action("tPdf", "Report/", new {SecurityCode = ViewData["SCode"], site = ViewBag.site, team = ViewBag.team, sortOrder = "T"})},
                                 }, "Value", "Text"),
                                 new { id = "OrderSelector", @class = "sortOrder", onchange = "CallChangeFunc(this.value)" }
                                 )
                        <input id="SCode" type="hidden" value="@ViewData["SCode"]" />
                        <input id="SelectedSort" type="hidden" value="@ViewBag.sortOrder" />
                    </div>
                    <div class="im-col--5" style="margin-top: 15px;">
                        <span>(to change your default sort preference, click on the 'Settings' tab)</span>
                    </div>
                    <div class="im-col--2">
                        @Html.ActionLink("Print", "Print", "Report", new { site = ViewBag.site, team = ViewBag.team, sortOrder = ViewBag.sortOrder }, new { @class = "im-btn im-btn--primary im-btn--sm printBtn", id = "PrintPdf" })
                    </div>

                    <div class="im-row im-padding-4  im-col--12" style="width: 100%;">
                        <div class="im-container">
                            <hr />
                        </div>
                    </div>
                </div>
            </div>
        }
    }
    <div class="im-container Report im-no-padding-left" style="width: 95%;" id="Report">
        <div class="im-row title">
            <div class="im-col--6 im-no-padding-left">
                <p class="im-text--extra-bold-weight inline">
                    CC
                </p>
                <p class="inline">
                    - @ViewBag.status, @ViewBag.site, @ViewBag.team, @ViewBag.user
                </p>
            </div>
            <div class="im-col--6">
                <p class="im-text--extra-bold-weight inline">
                    @{ string[] currentDate = DateTime.Now.ToString("g").Split(' ');}
                    @currentDate[0] at @currentDate[1]
                </p>
                <p class="im-float--right im-text--color-grey im-text--extra-bold-weight inline">
                    @Model.Count() Rat(s)
                </p>
            </div>

        </div>
    </div>
</body>
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