Question

我在编辑表单中的应用程序中有一个下拉列表。但在某些地方我错了。

HomeController.cs

        ViewData["RealizatorID"] = from r in db.tGlavnas
           select new SelectListItem { Text = r.Realizator.ImeRealizatora, 
           Value = r.Realizator.ImeRealizatora, Selected = (r.RealizatorID == id) };

Edit.aspx

        <div class="editor-label">
            <%: Html.LabelFor(model => model.RealizatorID) %>
        </div>
        <div class="editor-field">
            <%: Html.DropDownList("RealizatorID")%>
            <%: Html.ValidationMessageFor(model => model.RealizatorID) %>
        </div>

在Edit.aspx页面中记录更改后，向我报告错误：

没有类型为“IEnumerable”的ViewData项具有“RealizatorID”键。

Answer 1

我建议你做以下事情：

控制器：

ViewData["SelRealizator"] = from r in db.tGlavnas
           select new SelectListItem { Text = r.Realizator.ImeRealizatora, 
           Value = r.Realizator.ImeRealizatora, Selected = (r.RealizatorID == id) };

查看：

<div class="editor-label">
    <%: Html.LabelFor(model => model.RealizatorID) %>
</div>
<div class="editor-field">
    <%: Html.DropDownListFor(model => model.RealizatorID, ViewData["SelRealizator"] as IEnumerable<SelectListItem>)%>
    <%: Html.ValidationMessageFor(model => model.RealizatorID) %>
</div>

Answer 2

完整代码：

    public ActionResult Edit(int id)
    {
        var log = db.tGlavnas.Single(lo => lo.RedniBroj == id);

        ViewData["SelRealizator"] = from r in db.tGlavnas select new SelectListItem { Text = r.Realizator.ImeRealizatora, Value = r.Realizator.ImeRealizatora, Selected = (r.RealizatorID == id) };
        return View(log);
    }

我还没有写Post方法。

Answer 3

Edit.aspx

<h2>Edit</h2>
<% using (Html.BeginForm()) {%>
    <%: Html.ValidationSummary(true) %>

    <fieldset>
        <legend>Fields</legend>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.RedniBroj) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.RedniBroj) %>
            <%: Html.ValidationMessageFor(model => model.RedniBroj) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.DatumPrijema) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.DatumPrijema) %>
            <%: Html.ValidationMessageFor(model => model.DatumPrijema) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.DatumPredaje) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.DatumPredaje) %>
            <%: Html.ValidationMessageFor(model => model.DatumPredaje) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.BrojID) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.BrojID) %>
            <%: Html.ValidationMessageFor(model => model.BrojID) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.PredmetJavneNabavke) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.PredmetJavneNabavke) %>
            <%: Html.ValidationMessageFor(model => model.PredmetJavneNabavke) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.VrstaID) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.VrstaID) %>
            <%: Html.ValidationMessageFor(model => model.VrstaID) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.TipSredstvaID) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.TipSredstvaID) %>
            <%: Html.ValidationMessageFor(model => model.TipSredstvaID) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.ProcenjenaVrednost) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.ProcenjenaVrednost) %>
            <%: Html.ValidationMessageFor(model => model.ProcenjenaVrednost) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.PoKontuID) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.PoKontuID) %>
            <%: Html.ValidationMessageFor(model => model.PoKontuID) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.RealizatorID) %>
        </div>
        <div class="editor-field">
            <%: Html.DropDownListFor(model => model.RealizatorID, ViewData["SelRealizator"] as 
                IEnumerable<SelectListItem>)%>
            <%: Html.ValidationMessageFor(model => model.RealizatorID) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.PonudjacID) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.PonudjacID) %>
            <%: Html.ValidationMessageFor(model => model.PonudjacID) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.Iznos) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.Iznos, String.Format("{0:F}", Model.Iznos)) %>
            <%: Html.ValidationMessageFor(model => model.Iznos) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.BrojRacuna) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.BrojRacuna) %>
            <%: Html.ValidationMessageFor(model => model.BrojRacuna) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.DatumIsplate) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.DatumIsplate, String.Format("{0:g}", Model.DatumIsplate)) %>
            <%: Html.ValidationMessageFor(model => model.DatumIsplate) %>
        </div>

        <div class="editor-label">
            <%: Html.LabelFor(model => model.JavnaNabSprovPostID) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.JavnaNabSprovPostID) %>
            <%: Html.ValidationMessageFor(model => model.JavnaNabSprovPostID) %>
        </div>

        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>

<% } %>

<div>
    <%: Html.ActionLink("Back to List", "Index") %>
</div>

ASP.NET MVC DropDownList和HTML属性

3 个答案: