C# Razor syntax rules

Use a single variable directly@aThe form of does not require a semicolon, generally use existing variables directly, pay attention to usinghtmlWhen tagging, razorAdd a space to the expression.

//The following are all wrong @int a=0 //There can't be spaced//@int a=0, @int will be recognized as a Razor expression, a=0 will be recognized as a character, and @int will report an error @int a = 0//No spaces&lt;p&gt;How many people are there@a&lt;/a&gt;
//It will not be recognized here, it has become a character&lt;h1 class="display-4"&gt;Welcome @a;&lt;/h1&gt;
// The input is@a; Will only recognize@a,and;Will become a character

Razor code is encapsulated in @{ ... } --Multiple lines of code need to be included in @{}middle

@{ int a = 0}        //Report an error，exist@{}Press normallyC#Write code，Add a point number after the statement

Encapsulated in@{ ... }In , Razor's variables are global, and a variable is declared at one position and can be used later.
If the variable isif/for{} If declared at et al, it is a local variable. Forif/for For these functions, they can be not included in @{} and can be used directly@if/@forThis form

&lt;!-- Multi-line statement code block 1 --&gt;
@{
var greeting = "Welcome to our site!";
var weekDay = ;
var greetingMessage = greeting + " Here in Huston it is: " + weekDay;
}

&lt;!-- Multi-line statement code block 2 --&gt;
&lt;ul&gt;  
@for (int i = 0; i &lt; 100; i++)
   {
    i += 1;
    &lt;li&gt;@i&lt;/li&gt;
   }

In-line expressions (variables and functions) start with @ --A single expression such as assignment or output, you only need to add @ at the beginning

&lt;!-- Single line of code block --&gt;
@{ var myMessage =    "Hello World"; }

&lt;!-- In-line expressions or variables --&gt;
&lt;p&gt;The value of myMessage is: @myMessage&lt;/p&gt;

Code statements end with semicolons
Strings are surrounded by quotes
C# code is case sensitive, Razor is the same

hint:
The variables declared in @{} are global.
@var net = "From the beginning to the abandonment"; is the wrong way to write it, because single-line expressions cannot have spaces. Please use @{ var net = "From Getting Started to Give Up";}
Razor code can be placed anywhere in the HTML tag, combined with the tag to present content to the user.
In the multi-line code block @{}, if there are only c# code statements, there is no need to prepend each statement, such as the first item in the knowledge summary.
The multi-line statement block @{} can contain HTML tags. If you need to use code in HTML tags, you only need to add a statement in the format of "@ statement" to a certain part.
In the example "Multi-line statement code block 2", "@for{}" is directly used, which contains multiple lines of code. Here, multiple lines of code can be added to the for function "for{}", which is consistent with "@{}".
In addition to the for function, if , if...else... , while and other functions can also contain multiple lines of code.
More complex situations:

&lt;div class="container-fluid col-10"&gt;
                @{
                    if (Model != null)
                    {
                        if ( == 200)
                        {
                            var a = (AccurateBasicModel);
                            if ( != null)
                            {
                                &lt;p&gt;Image orientation @&lt;/p&gt;
                            }
                            &lt;p&gt;Number of identified text @a.words_result_num&lt;/p&gt;
                            int i = 1;
                            &lt;table class="table table-hover table-responsive table-bordered"&gt;
                                &lt;tr&gt;&lt;td&gt;serial number&lt;/td&gt;&lt;td&gt;Identify text&lt;/td&gt;&lt;td&gt;Row confidence average&lt;/td&gt;&lt;td&gt;Row confidence variance&lt;/td&gt;&lt;td&gt;Minimum value of confidence&lt;/td&gt;&lt;/tr&gt;
                                @foreach (var item in a.words_result)
                                {
                                    &lt;tr&gt;
                                        &lt;td&gt;@i&lt;/td&gt;
                                        &lt;td&gt; @&lt;/td&gt;
                                        @{
                                            if ( != null)
                                            {
                                                &lt;td&gt;@&lt;/td&gt;
                                                &lt;td&gt;@&lt;/td&gt;
                                                &lt;td&gt;@&lt;/td&gt;
                                            }
                                            else
                                            {
                                                &lt;td&gt;Not set&lt;/td&gt;
                                                &lt;td&gt;Not set&lt;/td&gt;
                                                &lt;td&gt;Not set&lt;/td&gt;
                                            }
                                        }
                                        @{ i++;}
                                    &lt;/tr&gt;
                                }
                            &lt;/table&gt;
                        }
                        else
                        {
                            &lt;h3&gt;Identification errors，Error details：&lt;/h3&gt;
                            &lt;p&gt;
                                @()
                            &lt;/p&gt;
                        }
                    }
                    else
                    {
                        &lt;h2 &gt;Please upload pictures&lt;/h2&gt;
                    }
                }
            &lt;/div&gt;
        &lt;/div&gt;

This is all about this article about C# Razor grammar rules. I hope it will be helpful to everyone's learning and I hope everyone will support me more.