Model.（变量）有什么作用？
好的，我已经得到了这段代码：
public ActionResult Welcome(string name = "", int numTimes = 1)
{
var viewModel = new WelcomeViewModel
{
Message = "Hello " + name,
NumTimes = numTimes
};
return View(viewModel);
}
public class WelcomeViewModel
{
public string Message { get; set; }
public int NumTimes { get; set; }
}
Welcome() 中的视图是：
<h2>Welcome</h2>
<% for(int i = 0; i < Model.NumTimes; i++) {%>
<h3><%: Model.Message; %></h3>
<%} %>
首先，当我运行这个时，我在运行 .../Welcome?name=Scott&numtimes=4 时收到错误，说在行中
<h3><%: Model.Message; %></h3>
它期望 ')'
描述：编译服务此请求所需的资源期间发生错误。请查看以下具体错误详细信息并适当修改您的源代码。 编译器错误消息：CS1026:)预期
这是为什么？
其次，整个模型是什么？它有什么作用？
Okay, so I've got this code:
public ActionResult Welcome(string name = "", int numTimes = 1)
{
var viewModel = new WelcomeViewModel
{
Message = "Hello " + name,
NumTimes = numTimes
};
return View(viewModel);
}
public class WelcomeViewModel
{
public string Message { get; set; }
public int NumTimes { get; set; }
}
and the view in Welcome() is:
<h2>Welcome</h2>
<% for(int i = 0; i < Model.NumTimes; i++) {%>
<h3><%: Model.Message; %></h3>
<%} %>
Firstly, when I run this, I get an error when running .../Welcome?name=Scott&numtimes=4 saying that in the line
<h3><%: Model.Message; %></h3>
it expects ')'
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS1026: ) expected
why is this?
Secondly what is this whole Model thing? What does it do?
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评论（4）
这是因为
<%: Model.Message; %>翻译（基本上）为：如您所见，分号不应该在那里。编译器期望在分号之前有结束括号，因此会出现错误消息。
“模型事物”是 MVC 中的 M。模型是视图显示的数据。每个视图都有一个模型，因此模型包含视图所需的所有数据。
It's because the
<%: Model.Message; %>translates (basically) into:As you see, the semicolon should not be there. The compiler expects the ending parentheses before there is a semicolon, hence the error message.
The "Model thing" is the M in MVC. The Model is the data that the View displays. Each view has a single Model, so the Model contains all the data that the View needs.
我认为您不需要在
Model.Message之后添加分号。模型是对您在控制器中提供给视图的内容的引用。这与您在控制器中键入
return View(viewModel);的实例相同。I think you don't need to put the semi-colon after
Model.Message.Model is the reference to what you supplied to your view, in your controller. That's the same instance as what you type
return View(viewModel);in your controller.关于你的第二个问题，MVC 是一种将逻辑（在你的控制器中）与表示（在你的视图中）分离的方法。
您使用控制器生成一个模型，其中包含视图所需的所有信息。
例如，对于表单，模型将为每个输入都有一个字段。对于表，它将有一个
IEnumerable等...视图本身应该尽可能少地进行处理 - 简单的 if 语句和循环。所有实际逻辑都应限制于控制器。
一种思考方式是，开发人员编写控制器，设计人员编写视图，他们就模型中的内容进行协作 - 设计人员说“我需要知道 X、Y、Z” - 因此开发人员将它们添加到模型中模型并根据需要填充字段
正如另一个答案中提到的，
Model.Message后面的分号是多余的。With regards to your second question, MVC is a way of separating the logic (in your controller) from the presentation (in your view).
You use the controller to generate a model which contains all the information required by the view.
Eg for a form, the model would have a field for each input. For a table, it would have an
IEnumerable<SomeRowClass>etc...The view itself should do as little processing as possible - simple if statements and loops. all actual logic should be constrained to the controller.
One way to think of it is that a developer writes the controller, a designer writes the view and they collaborate for what goes in the model - designer says "I need to know X,Y,Z" - so the developer adds them to the model and populates the fields as appropriate
As mentioned in the other answer, the semicolon after
Model.Messageis superfluous.除了放错位置的分号之外，请确保您的视图定义为继承自
ViewPage。这指定了Model在视图中的类型，允许编译器解析其成员（Message、NumTimes）。In addition to the misplaced semicolon, make sure your view is defined to inherit from
ViewPage<WelcomeViewModel>. This specifies the type thatModelhas within the view, allowing the compiler to resolve its members (Message,NumTimes).