题
有没有文件上传一个HTMLHelper
?具体地讲,我要寻找一个替换的
<input type="file"/>
使用ASP.NET MVC的HtmlHelper。
或者,如果使用
using (Html.BeginForm())
什么是文件上传HTML控件?
解决方案
<强> HTML载文件ASP MVC 3。强>
<强>模型强>:(。请注意,FileExtensionsAttribute是MvcFutures可用它将验证文件扩展客户端和服务器端)
public class ViewModel
{
[Required, Microsoft.Web.Mvc.FileExtensions(Extensions = "csv",
ErrorMessage = "Specify a CSV file. (Comma-separated values)")]
public HttpPostedFileBase File { get; set; }
}
<强> HTML视图强>:
@using (Html.BeginForm("Action", "Controller", FormMethod.Post, new
{ enctype = "multipart/form-data" }))
{
@Html.TextBoxFor(m => m.File, new { type = "file" })
@Html.ValidationMessageFor(m => m.File)
}
<强>控制器动作强>:
[HttpPost]
public ActionResult Action(ViewModel model)
{
if (ModelState.IsValid)
{
// Use your file here
using (MemoryStream memoryStream = new MemoryStream())
{
model.File.InputStream.CopyTo(memoryStream);
}
}
}
其他提示
您还可以使用:
@using (Html.BeginForm("Upload", "File", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
<p>
<input type="file" id="fileUpload" name="fileUpload" size="23" />
</p>
<p>
<input type="submit" value="Upload file" /></p>
}
或者你可以正确地做到这一点:
在您的HtmlHelper Extension类:
public static MvcHtmlString FileFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression)
{
return helper.FileFor(expression, null);
}
public static MvcHtmlString FileFor<TModel, TProperty>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TProperty>> expression, object htmlAttributes)
{
var builder = new TagBuilder("input");
var id = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression));
builder.GenerateId(id);
builder.MergeAttribute("name", id);
builder.MergeAttribute("type", "file");
builder.MergeAttributes(new RouteValueDictionary(htmlAttributes));
// Render tag
return MvcHtmlString.Create(builder.ToString(TagRenderMode.SelfClosing));
}
此行:
var id = helper.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(ExpressionHelper.GetExpressionText(expression));
生成独特的模型的ID,你知道在名单之类的东西。模型[0]请将.Name等
在模型中创建正确的属性:
public HttpPostedFileBase NewFile { get; set; }
然后,你需要确保你的表单将发送文件:
@using (Html.BeginForm("Action", "Controller", FormMethod.Post, new { enctype = "multipart/form-data" }))
然后这里是你的帮手:
@Html.FileFor(x => x.NewFile)
改进Paulius Zaliaduonis'的回答的版本:
为了使验证工作正常,我不得不改变模型:
public class ViewModel
{
public HttpPostedFileBase File { get; set; }
[Required(ErrorMessage="A header image is required"), FileExtensions(ErrorMessage = "Please upload an image file.")]
public string FileName
{
get
{
if (File != null)
return File.FileName;
else
return String.Empty;
}
}
}
和视图以:
@using (Html.BeginForm("Action", "Controller", FormMethod.Post, new
{ enctype = "multipart/form-data" }))
{
@Html.TextBoxFor(m => m.File, new { type = "file" })
@Html.ValidationMessageFor(m => m.FileName)
}
这是必需的,因为什么@Serj萨根写FileExtension属性只使用了字符串。
要使用BeginForm
,这里是使用它的方式:
using(Html.BeginForm("uploadfiles",
"home", FormMethod.POST, new Dictionary<string, object>(){{"type", "file"}})
这也适用:
<强>型号:强>
public class ViewModel
{
public HttpPostedFileBase File{ get; set; }
}
查看:强>
@using (Html.BeginForm("Action", "Controller", FormMethod.Post, new
{ enctype = "multipart/form-data" }))
{
@Html.TextBoxFor(m => m.File, new { type = "file" })
}
<强>控制器动作:强>
[HttpPost]
public ActionResult Action(ViewModel model)
{
if (ModelState.IsValid)
{
var postedFile = Request.Files["File"];
// now you can get and validate the file type:
var isFileSupported= IsFileSupported(postedFile);
}
}
public bool IsFileSupported(HttpPostedFileBase file)
{
var isSupported = false;
switch (file.ContentType)
{
case ("image/gif"):
isSupported = true;
break;
case ("image/jpeg"):
isSupported = true;
break;
case ("image/png"):
isSupported = true;
break;
case ("audio/mp3"):
isSupported = true;
break;
case ("audio/wav"):
isSupported = true;
break;
}
return isSupported;
}
这是一个小哈克我想,但它会导致正确的验证特性等被施加
@Html.Raw(Html.TextBoxFor(m => m.File).ToHtmlString().Replace("type=\"text\"", "type=\"file\""))
不隶属于 StackOverflow