使用MVC5进行图像上载的服务器端验证

Question

我需要使用mvc5验证服务器端的图像上传。我正在使用angularJS代码使用base64上传图像。如何验证图像。 这是我在视图中的图片上传代码代码..

在视图中

 <div>
 <span class="btn btn-primary" ng-show="!$flow.files.length" data-flow-btn id="Image"        >Select image</span>
 <span class="btn btn-info" ng-show="$flow.files.length" data-flow-btn id="Image" >Change</span>
 <span class="btn btn-danger" ng-show="$flow.files.length" ng-click="$flow.cancel()" >Remove</span>
</div>

控制器中的

public ActionResult ValidationControl()
{
    return View();
}
[HttpPost]
public ActionResult ValidationControl(IEnumerable<HttpPostedFileBase> file,ServerValidation model)
{
    if (!ModelState.IsValid)
    {
        ViewBag.Name = model.UserName;
        ViewBag.Email = model.Password ;
    }
    return View();
}

在模型中

public class ServerValidation
{
    [Required(ErrorMessage = "Name is Required")]
    public string UserName { get; set; }
    [Required (ErrorMessage = "password is Required")]
    public string Password { get; set; }
    [Required(ErrorMessage = "Image is Required")]
    public string Image { get; set; }
}