HttpPostedFileBase不具约束力的模型 [英] HttpPostedFileBase not binding to model

问题描述

这是我的ViewModel

 公共类FaultTypeViewModel
{
    [HiddenInput（DisplayValue = FALSE）]
    公众诠释TYPEID {搞定;组; }    [必填（ErrorMessageResourceType = typeof运算（AdministrationStrings），ErrorMessageResourceName =FaultTypeNameRequired）]
    [显示（=的ResourceType typeof运算（AdministrationStrings），名称=FaultTypeName）]
    公共字符串类型名{获得;组; }    [显示（=的ResourceType typeof运算（AdministrationStrings），名称=FaultTypeDescription）]
    [数据类型（DataType.MultilineText）
    公共字符串TypeDescription {搞定;组; }    [显示（=的ResourceType typeof运算（AdministrationStrings），名称=FaultTypeImageFile）]
    公共HttpPostedFileBase TypeImageFile {搞定;组; }    [HiddenInput（DisplayValue = FALSE）]
    公共字符串TypeImageURL {搞定;组; }
}
 

通知我有一个TypeImageFileHttpPostedFileBase
我预计到模型传递到控制器BU我只是不断收到空模型绑定会纽带，财产的形式。

下面是在查看相关code：

  @using（Html.BeginForm（AddFaultType，管理，FormMethod.Post））
{    ＆LT; D​​IV CLASS =模头＆GT;
        ＆LT;按钮式=按钮级=关闭数据解雇=莫代尔ARIA隐藏=真＆GT;
            ×＆LT; /按钮＆GT;
        ＆LT; H3 ID =myModalLabel＆GT; @ SharedStrings.Add @ SharedStrings.FaultType＆LT; / H3 GT＆;
    ＆LT; / DIV＆GT;
    ＆LT; D​​IV CLASS =模体＆GT;
        @ Html.ValidationSummary（真）
        ＆LT; D​​IV CLASS =编辑标记＆GT;
            @ Html.LabelFor（型号=＆GT; model.TypeName）
        ＆LT; / DIV＆GT;
        ＆LT; D​​IV CLASS =主编场＆GT;
            @ Html.EditorFor（型号=＆GT; model.TypeName）
            @ Html.ValidationMessageFor（型号=＆GT; model.TypeName）
        ＆LT; / DIV＆GT;
        ＆LT; D​​IV CLASS =编辑标记＆GT;
            @ Html.LabelFor（型号=＆GT; model.TypeDescription）
        ＆LT; / DIV＆GT;
        ＆LT; D​​IV CLASS =主编场＆GT;
            @ Html.EditorFor（型号=＆GT; model.TypeDescription）
            @ Html.ValidationMessageFor（型号=＆GT; model.TypeDescription）
        ＆LT; / DIV＆GT;
        ＆LT; D​​IV CLASS =编辑标记＆GT;
            @ Html.LabelFor（型号=＆GT; model.TypeImageFile）
        ＆LT; / DIV＆GT;
        ＆LT; D​​IV CLASS =主编场＆GT;
            ＆LT;输入类型=文件名称=TypeImageFileID =TypeImageFile/＆GT;
        ＆LT; / DIV＆GT;
    ＆LT; / DIV＆GT;    ＆LT; D​​IV CLASS =模式躯＆GT;
        ＆LT;输入类型=提交值=@ SharedStrings.Add级=BTN BTN-主要/＆GT;
        @ Html.ActionLink（SharedStrings.Cancel，索引，管理，空，新的{类=BTN，data_dismiss =莫代尔，aria_hidden =真}）
    ＆LT; / DIV＆GT;
}
 

和这里是控制器：

  [HttpPost]
        公众的ActionResult AddFaultType（FaultTypeViewModel i_FaultToAdd）
        {
            变种文件名= Path.GetFileName（i_FaultToAdd.TypeImageFile.FileName）;
            VAR路径= Path.Combine（使用Server.Mappath（〜/ App_Data文件/上传），文件名）;
            i_FaultToAdd.TypeImageFile.SaveAs（路径）;            返回RedirectToAction（「指数」）;
        }
 

解决方案

请确保你设置你的窗体上的是enctype 属性多部分/ form-data的表单上，如果你希望能够上传文件：

  @using（Html.BeginForm（AddFaultType，管理，FormMethod.Post，新{ENCTYPE =的multipart / form-data的}））
{
    ...
}
 

here is my ViewModel

public class FaultTypeViewModel
{
    [HiddenInput(DisplayValue = false)]
    public int TypeID { get; set; }

    [Required(ErrorMessageResourceType = typeof(AdministrationStrings), ErrorMessageResourceName = "FaultTypeNameRequired")]
    [Display(ResourceType = typeof(AdministrationStrings), Name = "FaultTypeName")]
    public string TypeName { get; set; }

    [Display(ResourceType = typeof(AdministrationStrings), Name = "FaultTypeDescription")]
    [DataType(DataType.MultilineText)]
    public string TypeDescription { get; set; }

    [Display(ResourceType = typeof(AdministrationStrings), Name = "FaultTypeImageFile")]
    public HttpPostedFileBase TypeImageFile { get; set; }

    [HiddenInput(DisplayValue = false)]
    public string TypeImageURL { get; set; }
}

Notice I have a "TypeImageFile" HttpPostedFileBase I would expect that the model binder would bond that property from the form to the model passes to the controller bu I just keep receiving null.

here is the relevant code in the View:

@using (Html.BeginForm("AddFaultType","Administration", FormMethod.Post))
{

    <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">
            ×</button>
        <h3 id="myModalLabel">@SharedStrings.Add @SharedStrings.FaultType</h3>
    </div>
    <div class="modal-body">
        @Html.ValidationSummary(true)
        <div class="editor-label">
            @Html.LabelFor(model => model.TypeName)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.TypeName)
            @Html.ValidationMessageFor(model => model.TypeName)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.TypeDescription)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.TypeDescription)
            @Html.ValidationMessageFor(model => model.TypeDescription)
        </div>
        <div class="editor-label">
            @Html.LabelFor(model => model.TypeImageFile)
        </div>
        <div class="editor-field">
            <input type="file" name="TypeImageFile" id="TypeImageFile" />
        </div>
    </div>

    <div class="modal-footer">
        <input type="submit" value="@SharedStrings.Add" class="btn btn-primary" />
        @Html.ActionLink(SharedStrings.Cancel, "Index", "Administration", null, new { Class = "btn", data_dismiss = "modal", aria_hidden = "true" })
    </div>
}

and here is the controller:

        [HttpPost]
        public ActionResult AddFaultType(FaultTypeViewModel i_FaultToAdd)
        {
            var fileName = Path.GetFileName(i_FaultToAdd.TypeImageFile.FileName);
            var path = Path.Combine(Server.MapPath("~/App_Data/uploads"), fileName);
            i_FaultToAdd.TypeImageFile.SaveAs(path);

            return RedirectToAction("Index");
        }

解决方案

Make sure you've set the enctype attribute on your form to multipart/form-data on your form if you want to be able to upload files:

@using (Html.BeginForm("AddFaultType", "Administration", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    ...
}

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