c# – 使用Base64 String在MVC Webgrid中下载问题

我正在尝试在MVC网格中实现下载功能.这是演示代码.

模型

public class Student
    {
        public string Name { get; set; }
        public string Address { get; set; }

        public string ByteArray { get; set; }

        public List<Student> StudentList { get; set; }

    }

视图

@model Fileuploaddemo.Models.Student

   @{ var grid = new WebGrid(Model.StudentList);}

    @Html.LabelFor(model => model.Name)
    @Html.EditorFor(model => model.Name)

    @Html.LabelFor(model => model.Address)
    @Html.EditorFor(model => model.Address)

  @grid.GetHtml(            
                  htmlAttributes: new
                  {
                      id = "gridT1",@calss = ""
                  },tableStyle: "webgrid-table",headerStyle: "webgrid-header",columns: grid.Columns(
    grid.Column(columnName: "Name",header: "Name"),grid.Column(columnName: "Address",header: "Address") ))

调节器

public ActionResult Index()
        {
            Student obj = new Student();
            obj.StudentList = new List<Student>();
            return View(obj);

        }
        [HttpPost]
        public ActionResult Index(Student obj,HttpPostedFileBase file1)
        {
            if (file1 != null)
            {
                MemoryStream target = new MemoryStream();
                file1.InputStream.copyTo(target);
                byte[] data = target.ToArray();
                obj.ByteArray = Convert.ToBase64String(data);
            }

            obj.StudentList = new List<Student>();
            obj.StudentList.Add(obj);
            return View(obj);

        }

在这段代码中,我试图在MVC Web网格中显示学生详细信息以及文件下载选项.

但在这里,我没有得到如何下载文件,这是base64string格式.

请协助我解决问题.

提前致谢.

解决方法

你需要为你的WebGrid添加一个额外的列,它将有一个名为“下载”的链接.这个链接需要在控制器中调用下载操作并通过被点击的学生的base64属性.这是一个完整的工作示例,希望它可以帮助你：

控制器：

public class StudentController : Controller
{
    public ActionResult Index()
    {
        Student obj = new Student();
        byte[] bytes = System.IO.File.ReadAllBytes("F:\\test.txt");
        string ba = Convert.ToBase64String(bytes);

        var s1 = new Student { Name = "Student1",Address = "Address1",ByteArray = ba };
        var s2 = new Student { Name = "Student2",Address = "Address2",ByteArray = ba };
        var s3 = new Student { Name = "Student3",Address = "Address3",ByteArray = ba };

        obj.StudentList = new List<Student>() { s1,s2,s3 };
        return View(obj);
    }

    [HttpGet]
    public FileResult DownloadAction(string file)
    {
        byte[] fileBytes = Convert.FromBase64String(file);
        string fileName = "test.txt";
        return File(fileBytes,System.Net.Mime.MediaTypeNames.Application.Octet,fileName);
    }
}

视图：

@model Fileuploaddemo.Models.Student

@{ var grid = new WebGrid(Model.StudentList);}

@Html.LabelFor(model => model.Name)
@Html.EditorFor(model => model.Name)

@Html.LabelFor(model => model.Address)
@Html.EditorFor(model => model.Address)


@grid.GetHtml(
                  htmlAttributes: new
                  {
                      id = "gridT1",header: "Address"),grid.Column("Download","Download",format: @<text>
        @Html.ActionLink("Download","DownloadAction","Student",new { file = item.ByteArray },null)
    </text>)
    ))