MVC @Html.下拉列表在ViewBag中使用SelectList时出现错误

本文关键字：SelectList 错误 下拉列表 @Html ViewBag MVC | 更新日期: 2023-09-27 18:14:13

我在控制器中创建了一个列表:

     var PayList = new[] {
      new ListEntry { Id = 1, Name = "" },
      new ListEntry { Id = 2, Name = "Yes" },  
      new ListEntry { Id = 3, Name = "No" }  
      };
     ViewBag.PayList = new SelectList(PayList, "Id", "Name");

在视图中，我有以下内容:

    @Html.DropDownList("Pay", new SelectList(ViewBag.PayList,"Id","Name"))

当我试图显示它时，它显示如下:数据绑定:"System.Web.Mvc。SelectListItem'不包含名称为'Id'的属性。不知道为什么这不起作用。

还有，我如何默认选择列表的值。我喜欢默认为"是"。我认为有一种方法可以从控制器做到这一点

MVC @Html.下拉列表在ViewBag中使用SelectList时出现错误

您的ViewBag.PayList已经是SelectList的类型。我不认为有理由创建两次SelectList，所以它不应该只是:

@Html.DropDownList("Pay", ViewBag.PayList)

或

@Html.DropDownList("Pay", ViewBag.PayList as SelectList)

(我从来没有使用过ViewBag，所以我不确定你的版本是否是强类型的)。

就用

@Html.DropDownList("Pay", ViewBag.PayList)

在你的视图

Try this Way:
<div id="divmsg" style="color: green; font-weight: bold">
    @ViewBag.Msg
</div>
<div id="divmsg2" style="color: red; font-weight: bold">@ViewBag.Msg2</div>
<div id="quality" style="width: 80%;" align="center">
    <input type="hidden" value="@ViewBag.ProjectId" id="ProjectId_" class="projectId"/>
    <input type="hidden" value="@ViewBag.ProjectName" id="ProjectName_" class="projectName"/>
    <input type="hidden" value="@ViewBag.UserId" class="UserId_" id="UserId"/>
    <input type="hidden" value="@ViewBag.TempId" class="TempId_" id="TempId" />
    <div class="toggle-contents">
        <table width="100%" id="qualitygoal">
            <tr>
                <td class="even" align="left">
                    @Html.Label("Project Id")
                </td>
                <td class="even" align="left">
                    @ViewBag.ProjectId
                </td>
            </tr>
            <tr>
                <td class="projectname" align="left">
                    @Html.Label("Project Name")
                </td>
                <td class="projectname" align="left">
                    @ViewBag.ProjectName
                </td>
            </tr>
        </table>
        <table width="100%" id="qualitygoal1" class="tbl">
            <tbody>
                <tr>
                    <th align="center">DestinationColumns</th>
                    <th align="center">SourceColumns</th>

                </tr>
                @foreach (var data in Model)
                {
                    <tr>
                        <td>
                            <span class="spanStatus" id="lblStatus_@data.TempId"  destinationID = "@data.Destination">@data.Destinationvalue</span>
                            <select class="status" id="ddlStatus_@data.TempId">
                                <option value="0">--Select--</option>
                                <option value="4">TICKET ID</option>
                                <option value="5">DESCRIPTION</option>
                                <option value="6">TICKET CATEGERY</option>
                                <option value="7">SEVIORITY/PRIORITY</option>
                                <option value="8">STATUS</option>
                                <option value="9">CREATED DATE</option>
                                <option value="10">CREATED BY</option>
                                <option value="11">ASSIGNED TO</option>
                                <option value="12">ASSIGNED DATE</option>
                                <option value="13">REPSONSE ETA</option>
                                <option value="14">RESOLUTION ETA</option>
                                <option value="15">RESPONSE DATE</option>
                                <option value="16">RESOLUTION DATE</option>
                                <option value="17">ROOT CAUSE/MODULE</option>
                                <option value="18">REOPEN FLAG (Y/N)</option>
                                <option value="19">CLOSE DATE</option>
                                <option value="20">SLA MET (Y/N)</option>
                            </select>
                        </td>
                        <td>
                            <span class="spanSource" id="lblSource_@data.TempId" >@data.Source</span>
                            <input  class="Source" id="txtSource_@data.TempId" type="text" value="@data.Source" maxlength="30"  />
                        </td>
                        <td>
                            <table style="width: 50%;">
                                <tr>
                                    <td>
                                        <input class="edit" id="Edit_@data.TempId" type="button" value="Edit"   />
                                        <input class="update" id="Update_@data.TempId" type="button" value="Update"  />
                                    </td>
                                    <td class="Gcancle" id="Canc_@data.TempId">
                                        <input class="gridcancel" id="Cancel_@data.TempId" type="button" value="Cancel"  />
                                    </td>
                                </tr>
                            </table>
                        </td>
                        <td>
                            <table style="width: 50%;">
                                <tr>
                                    <td>
                                        <input class="delete" id="Delete_@data.TempId" type="button" value="Delete"  />
                                    </td>
                                </tr>
                            </table>
                        </td>
                    </tr>
                }
            </tbody>
        </table>
    </div>
    <div align="right">
        <input type="button" value="Add New Row" class="Add" />
        <input type="button" value="Save" class="saved" />
        <input type="button" value="Close" class="cancel" />

    </div>
</div>
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