如何在MVC视图中检查空值？

string myVar = null;
string result = myVar == null ? "空值" : myVar;

string myVar = null;
string result = myVar?.ToString() ?? "空值";

@if (Model.MyVar == null)
{
    <p>空值</p>
}
else
{
    <p>@Model.MyVar</p>
}

<p>@(Model.MyVar == null ? "空值" : Model.MyVar)</p>