c# - How to check file extension before displaying in view

Question

I have a project where I need to display images and videos. I am saving both image and videos URL inside a table called Images and while retrieving I am using image handler for images to resize the image on the server level. Right now my code to display images and video is just this line

<td>
                                <img src="~/ImageHandler.ashx?file=@Html.DisplayFor(modelItem => item.url)" />
                            </td>

I need something like below to identify the file extension before displaying. if the extension is png or jpeg go to this line else this line. How can I do like below or any other better option?

                        @foreach (var item in Model)
                        {
                            <tr>
                                if (extension == .png || extension == .jpeg )
                                {
                                <td>
                                    <img src="~/ImageHandler.ashx?file=@Html.DisplayFor(modelItem => item.url)" />
                                </td>
                                }
                                else
                                {
                                <td>
                                    <video width="240" height="240" autoplay>
                                        <source src="@Html.DisplayFor(modelItem => item.url)" type="video/mp4">
                                    </video>
                                </td>
                                }
                                <td>
                                    @Html.DisplayFor(modelItem => item.details)
                                </td>
                            </tr>
                        }

标签： c#asp.net-mvcrazor

Answer 1

如果模型仅包含文件的 url/路径，则可以使用分隔符将字符串拆分为“。” 并获取结果字符串数组中的最后一个元素。
例如：

@foreach(var item in Model)
{
    var extn = item.url.Split(".").Last();
    if (extn == ".png" || extn == ".jpeg" )
    {
        @*Do image display*@
    }
    else
    {
       @*Do video display*@
    }
}

不确定这是否是最佳的，但我想不出另一种方法来做到这一点。