mvc htmlhelper扩展

public static MvcHtmlString NewTextBox(this HtmlHelper htmlHelper, string name, string value)
{
    var builder = new TagBuilder("input");
    builder.Attributes["type"] = "text";
    builder.Attributes["name"] = name;
    builder.Attributes["value"] = value;
    return MvcHtmlString.Create(builder.ToString(TagRenderMode.SelfClosing));
}

public static MvcHtmlString NewTextBoxFor<TModel, TProperty>
(this HtmlHelper<TModel> htmlHelper, Expression<Func<TModel, TProperty>> expression)
{
    var name = ExpressionHelper.GetExpressionText(expression);
    var metadata = ModelMetadata.FromLambdaExpression(expression, htmlHelper.ViewData);
    return NewTextBox(htmlHelper, name, metadata.Model as string);
}

使用：

@Html.NewTextBoxFor(model => model.Title)

生成的代码如下：
<input name="Title" type="text" value="" />

将文本内容下载：

 public FileStreamResult CreateFile()
        {
            //todo: add some data from your database into that string:
            var string_with_your_data = "1234";

            var byteArray = Encoding.ASCII.GetBytes(string_with_your_data);
            var stream = new MemoryStream(byteArray);

            return File(stream, "application/pdf", "your_file_name.txt");
        }

view使用方法：

@Html.ActionLink("Download Text File", "CreateFile", "SomeController ")