c# - 如果 MvC View 中不存在源，如何显示默认图像

Question

我在 loginpartial.cshtml 文件中有以下代码
如果 src 不存在，任何人都可以建议是否有办法显示默认图像？

@if (Request.IsAuthenticated)
{   

    <li><a href="#">Support</a></li>
    <li class="dropdown"><a class="dropdown-toggle" data-toggle="dropdown" href="#">



        //in below image tab m Display user Uploaded image ,
        //wants to display default Image if no Image is present

        <img src="/user/RetrievePhoto/@ABC.Web.Session.LoginData.UserToken.UserId" alt="" class="profilePhotoSM" />@ABC.Web.Session.LoginData.UserToken.UserName <span class="caret"></span></a>
        <ul class="dropdown-menu">
            <li>@using (Html.BeginForm("LogOff", "Account", FormMethod.Post, new { id = "logoutForm" }))
                {
                @Html.AntiForgeryToken()
                <a href="javascript:document.getElementById('logoutForm').submit()">Log off</a>
                }</li>
        </ul>
    </li>


}
else
{

    <li>@Html.ActionLink("Sign Up", "Register", "User", routeValues: null, htmlAttributes: new { id = "registerLink", @class = "navLink" })</li>
    <li>@Html.ActionLink("Login", "Authentication", "Account", routeValues: null, htmlAttributes: new { id = "loginLink", @class = "navLink" })</li>

}

Answer 1

将默认图像添加到您的网络服务器，即 myDefaultImage.png。将 ImageName 和 Photo 属性添加到您的模型，即

public class AModel
{
   public string ImageName { get; set; }
   public string Photo { get { return ImageName == null ? "myDefaultImage.png" : ImageName; }}
}

如果图像存在，请从您的 Controller 设置 ImageName 属性。如果未设置，Photo 属性中的 get 将处理默认图像。

然后您可以按如下方式显示 src:

src="/user/RetrievePhoto/@Model.Photo"