如何在cshtml中检查null/empty值

Question

<b>Start Date: </b>@employee["StartDate"].<br />

使用MVC Razor 3/C#,如何employee["StartDate"]在cshtml中检查值是否为空/空？所以,如果是,我反而显示:

<b>Start Date: </b>Unknown.<br />

我试过了:

@if(employee["StartDate"] == null){<b>Start Date: </b>Unknown.<br />} 

但这不起作用.

Answer 1

尝试

<b>Start Date: </b>@(employee["StartDate"] ?? "Unknown").<br />

??如果左侧值为,则返回左侧值或右侧值null.

Answer 2

如果您只担心 null 或 empty

@(String.IsNullOrEmpty(employee["StartDate"])?"Unknow":employee["StartDate"])