ViewStart和Layout-有什么区别? [英] ViewStart and Layout - what's the difference?

问题描述

我刚刚开始阅读ASP.NET MVC 4书籍，但遇到了一个问题.在Razor部分中，作者说，如果我未在View.cshtml文件中设置Layout变量，它将默认搜索_ViewStart.cshtml，但在另一部分中，他在Views/Shared中使用_Layout.cshtml，但我没有得到它

I have just started reading ASP.NET MVC 4 book and got one question. In the Razor part author said that if i dont set the Layout variable in the View.cshtml file it will as default search for a _ViewStart.cshtml, but in another part he is using _Layout.cshtml in Views/Shared, I dont get it.

如果我在View.cshtml中有这样的东西:

If i got smth like this in View.cshtml :

@{
     Layout = null;
 }

它告诉我们该视图没有布局，但是如果我使它像这样:

It tells that that this View has no layout, but if i make it like :

@{

 }

因此，这将使View搜索_ViewStart.cshtml文件或_Layout.cshtml吗?

So this will make that the View will search for a _ViewStart.cshtml file or _Layout.cshtml?

推荐答案

基本上，默认情况下，我们在视图>>共享>> _Layout.cshtml 中具有主布局，并且在 _ViewStart.cshtml ，这是我们的默认主版面.

Basically by default we have master layout in Views>> Shared >> _Layout.cshtml and this thing is defined in _ViewStart.cshtml that which one is our default master layout.

默认情况下，当我们使用主布局创建视图时，其主布局为 _Layout.cshtml ，但是我们可以从 _ViewStart.cshtml

When we create a view with master layout by default its master layout is _Layout.cshtml, but we can change it from _ViewStart.cshtml

我们写的时候:

@{
     Layout = null;
 }

在我们的视图中，我们说该视图没有任何主布局，这在我们主要创建部分视图或没有主布局的独立视图时使用.

in our view we say that this view does not have any master layout, this is used when we create partial view mostly or a standalone view without master layout.

如果您默认打开 _ViewStart.cshtml ，则其中会写有以下内容:

If you open _ViewStart.cshtml by default it has this written in it:

@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}

我们可以根据需要进行更改.

and we can change it if we want to.

您还可以通过在主布局视图上编写URL来更改某些特定视图的主布局:

You can also change of some specific view Master Layout by writing on top of it the url of master layout view:

@{
        Layout = "~/Views/Shared/_CustomMasterLayout.cshtml";
 }

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