ASP. NET CORE Study04

Binding source Attributes

With the help of binding source attributes You can pass the requested data to api, The details of the attribute Here's the picture .

but stay api Under the project of Marked apicontroller Of controller Next ,binding source attributes The rules of Something has changed

HttpHEAD

head It is also a kind of http Request method , He followed get The method is very similar . The important difference is head Method does not return body , Only the response header information .
head It can be used to obtain some information on resources .
stay asp.net core Provides HTTP attribute HttpHead Use , Very convenient .

Filter and Search for

Filter ： The first is a complete set , Then match them according to the conditions / Unmatched data items are removed .
Search for ： The first is an empty set , Then match them according to the conditions / Add unmatched data items to it .

Pay attention to filtration Field of Only right Exposed to the outside world DTO Class .

asp.net core exception handling

Under development mode , Unexpected exception occurred in the program , Prompt information is returned to the user through exception handling , Instead of returning exception information directly , There are hidden dangers in security .

yes startup Class configure Method to configure .

if (env.IsDevelopment())
            {
    
                app.UseDeveloperExceptionPage();
            }
            else
            {
    	
                //  Use useexceptionhandler  Middle price to simply handle exceptions 
                app.UseExceptionHandler(appBuilder => 
                {
    
                    appBuilder.Run(async context =>
                    {
    
                        context.Response.StatusCode = 500;
                        await context.Response.Body.WriteAsync(System.Text.Encoding.Default.GetBytes("Unexpected Error"));
                    });
                });
            }

http Security and idempotency

HTTP A detailed explanation of each method

according to http The security and idempotency of methods , What methods can be used to provide references in various business scenarios .

Delivery complexity Action Parameters

When Action When more parameters are required , Pass directly through formal parameters , This leads to very redundant code , So you need to use Model class To accept complex parameters , Handle the transfer of complex parameters .
First of all, you need to declare Model class , Is the basic simple ordinary c# class

    public class CompanyDtoParameters
    {
    
        public String CompanyName {
     get; set; }

        public String SearchTerm {
     get; set; }
    }

Note that the name of the attribute is the key name of the requested data .

And then in service Class and controller Use in

Be careful controller in You need to specify the Data source of model binding .