Justen  Hintz

Justen Hintz

1551342496

How to store all ctor parameters in fields

I'm learning C# and a thought came up when coding. Is it possible to automaticly store parameters from a constructor to the fields in a simple way without having to write this.var = var on every variable to store them?

Example:

class MyClass
{
    int var1;
    int var2;
    int var3;
    int var4;
    public MyClass(int var1, int var2, int var3, int var4){
        this.var1 = var1;
        this.var2 = var2;
        this.var3 = var3;
        this.var4 = var4;
    }
}

Is there a way to avoid writing this.varX = varX and save all the variables to the fields if the names are the same?

#c-sharp #oop

What is GEEK

Buddha Community

Elthel Mario

1551411070

No, largely because this pattern’s pretty rigid. For example, what if you wanted an argument that wouldn’t be set to a field; what’d be the syntax for that? Most solutions you might come up with would either be constraining or about as verbose as the current approach.

Still, that rigidity is only a problem in the general case. If this pattern works for you, then you can define it through inheritance, which is the right tool for this job.

So, you might define a set of generic Tuple<>-like classes that you can inherit from:

public abstract class TupleBase<T1>
{
    public T1 Argument1 { get; private set; }

    public TupleBase(T1 argument1)
    {
       this.Argument1 = argument1;
    }
}

public abstract class TupleBase<T1, T2>
{
    public T1 Argument1 { get; private set; }
    public T2 Argument2 { get; private set; }

    public TupleBase(T1 argument1, T2 argument2)
    {
       this.Argument1 = argument1;
       this.Argument2 = argument2;
    }
}

public abstract class TupleBase<T1, T2, T3>
{
    public T1 Argument1 { get; private set; }
    public T2 Argument2 { get; private set; }
    public T3 Argument3 { get; private set; }

    public TupleBase(T1 argument1, T2 argument2, T3 argument3)
    {
       this.Argument1 = argument1;
       this.Argument2 = argument2;
       this.Argument3 = argument3;
    }
}

//  Etc..

Then

class MyClass
{
    int var1;
    int var2;
    int var3;
    int var4;

    public MyClass(int var1, int var2, int var3, int var4){
        this.var1 = var1;
        this.var2 = var2;
        this.var3 = var3;
        this.var4 = var4;
    }
}

becomes

class MyClass : TupleBase<int, int, int, int>
{
    public MyClass(int var1, int var2, int var3, int var4)
        :   base(var1, var2, var3, var4)
    {
    }
}

.

Inheritance is the fundamentally correct tool for this since you want MyClass to pick up on a basic pattern, i.e. inherit it. The problem you’ll have in C# is that you can only inherit from one class at-a-time, so you can’t just tack on additional functionality like this in all cases.

Alternatively, you could write

class MyClass
{
    int var1;
    int var2;
    int var3;
    int var4;

    public MyClass(int var1, int var2, int var3, int var4){
        this.SetConstructorValues(var1, var2, var3, var4);
    }
}

, where .SetConstructorValues() is a generic extension method

private static System.Collections.ConcurrentDictionary<Type, Action<object, object[]>> ConstructorSetterDictionary { get; private set; }

public static void SetConstructorValues<T_SetClass>(
            this T_SetClass instanceToSetValuesFor
        ,   params object[] constructorArguments
    )
{
    var instanceType = typeof(T_SetClass);

    Action<object, object[]> constructorSetterAction;
    if (!ConstructorSetterDictionary.TryGetValue(
                instanceType
            ,   out constructorSetterAction
        ))
    {
        throw new Exception("Populate the dictionary!  Also change this Exception message; it's from a StackOverflow example and not really designed to actually be written like this.");
    }

    constructorSetterAction(
                instanceToSetValuesFor
            ,   constructorArguments
        );
}

, where ConstructorSetterDictionary is a dictionary of the setter-Action<object, object[]>'s for each Type, inferred according to whatever logic you like (e.g., matching constructors with parameter names to fields), populated upon program startup using reflection.

Conceptually, getting a method like this based on an object’s Type is basically how virtual methods work, where the ConstructorSetterDictionary is a virtual lookup table.

I find this sort of meta-programming to be useful in my own work, but be warned that, at some point, it stops being C#.

I am Developer

1597489568

Dynamically Add/Remove Multiple input Fields and Submit to DB with jQuery and Laravel

In this post, i will show you how to dynamically add/remove multiple input fields and submit to database with jquery in php laravel framework. As well as, i will show you how to add/remove multiple input fields and submit to database with validation in laravel.

dynamically add remove multiple input fields and submit to database with jquery and laravel app will looks like, you can see in the following picture:

add/remove multiple input fields dynamically with jquery laravel

Laravel - Add/Remove Multiple Input Fields Using jQuery, javaScript

Follow the below given easy step to create dynamically add or remove multiple input fields and submit to database with jquery in php laravel

  • Step 1: Install Laravel App
  • Step 2: Add Database Details
  • Step 3: Create Migration & Model
  • Step 4: Add Routes
  • Step 5: Create Controller by Artisan
  • Step 6: Create Blade View
  • Step 7: Run Development Server

https://www.tutsmake.com/add-remove-multiple-input-fields-in-laravel-using-jquery/

#laravel - dynamically add or remove input fields using jquery #dynamically add / remove multiple input fields in laravel 7 using jquery ajax #add/remove multiple input fields dynamically with jquery laravel #dynamically add multiple input fields and submit to database with jquery and laravel #add remove input fields dynamically with jquery and submit to database #sql

Kole  Haag

Kole Haag

1602403200

What is NoSQL and How is it Utilized?

Posted on September 25, 2020 by Dean Conally | Updated: October 8, 2020

Category: Tutorials | Tags: CassandraColumnsDatabaseDatabase ManagementDatabase StructureDB2Document StoresDynamic SchemaExtensible Record StoresGraph StoresJSONKey-ValueMSSQLMulti-RowMySQLNodeNode Relationship NodeNon-Relational DatabasesNoSQLNoSQL ModelQueryRowsScalabilitySchema FreeSQLStoresTablesWide-Column

Reading Time: 5 minutes

What is NoSQL?

A NoSQL or a NoSQL Database is a term used when referring to a “non SQL” or “not only SQL” database. NoSQL databases store data in a different format than a traditional relational database management systems. This is why NoSQL is often associated with the term “non-relational” database. Simply put, NoSQL databases are modern databases with high flexibility, blazing performance, and built for scalability. These databases are used when you require low latency and high extensibility while working with large data structures. The versatility of NoSQL is due to the nature of as being unrestricted in comparison to relational databases models such as MySQL or DB2.

SQL vs. NoSQL Comparison

There are multiple differences between SQL and NoSQL database types. In the table below, we will compare some of the most critical variations.

#tutorials #cassandra #columns #database #database management #database structure #db2 #document stores #dynamic schema #extensible record stores #graph stores #json #key-value #mssql #multi-row #mysql #node #node relationship node #non-relational databases #nosql #nosql model #query #rows #scalability #schema free #sql #stores #tables #wide-column

i-Verve Inc

i-Verve Inc

1621594876

How to start an online grocery store | Setting up Online Grocery Business in 2021

Start An Online Grocery Store

Despite the Covid-19 threat to the world and economy of every country, Online Grocery Market has recorded a 3X increase since 2019 till now.

“About 1-4th online shoppers are already shopping groceries on the internet in developed countries and 55% are willing to in near future. – Nielson study”

The new store these days are digital stores, Web stores, and Mobile applications where 70% of the customers reach and buy every day.

Take your store where the customers are to generate more revenue by developing e-commerce grocery store/application and Supermarket online store and mobile application.

Online grocery shopping sales in the United States from 2018 to 2023(in billion U.S. dollars)

“As per Statista, The U.S. online grocery market was estimated to generate sales worth about 28.68 billion U.S. dollars in 2019, with sales forecast to reach 59.5 billion U.S. dollars by 2023.”

Online store and mobile applications are helping small grocery business owners reach 70% more customers and generate unbelievable but real 48% more revenue other than the existing one. Check out a few of the businesses listed below:

  • Dry fruit sellers
  • Vegetables and organic vegetable sellers
  • Fruits and Organic Fruit sellers
  • Bakery product seller
  • Meat seller
  • Milk and Milk product seller
  • Mega Grocery store owner (All in one)

Want to start an online grocery store? – Here’s what you should know

If you dream of owning your own online store regardless are you setting up a small business for the first time or you’ve been in the game a long time, this guide will help you learn how to start an online store.

Online selling, better known as e-commerce, has truly hit its pace. Fortunately, getting started is easier than you might think provided you have basic information about the business (which we will cover here) and you have a team of ecommerce website store solution experts to get the things implemented.

Accenture estimates, by the end of 2020, the ecommerce industry will get 13.5% of the revenue share. What does it mean for online store owners? It means that out of every 7 dollars spent on retail consumption: eCommerce will get about 1 dollar.

This article was originally published - How to start an online grocery store?

#start an online grocery store, #steps to opening a successful online business #steps to open online store #create your own grocery store #ecommerce store development

I am Developer

1597489654

Laravel - Dynamically Add or Remove Input Fields

In this post, i will share with you how to dynamically add/remove input fields in laravel forms.

As well as, dynamically add/remove input field and save data to database laravel.

Laravel – Add/remove input field Dynamically with Jquery

Dynamically add/remove input fields using submit form with jQuery ajax with validation and store fields into database in laravel:

  1. Step 1: Install Laravel App
  2. Step 2: Add Database Details
  3. Step 3: Create Migration & Model
  4. Step 4: Add Routes
  5. Step 5: Create Controller by Artisan
  6. Step 6: Create Blade View
  7. Step 7: Run Development Server

https://www.tutsmake.com/laravel-dynamically-add-or-remove-input-fields-jquery/

#dynamically add input fields and save data to database laravel #laravel - dynamically add or remove input fields using jquery #add/remove input fields dynamically with jquery laravel #add remove input fields dynamically with jquery and submit to database in laravel

Justen  Hintz

Justen Hintz

1551342496

How to store all ctor parameters in fields

I'm learning C# and a thought came up when coding. Is it possible to automaticly store parameters from a constructor to the fields in a simple way without having to write this.var = var on every variable to store them?

Example:

class MyClass
{
    int var1;
    int var2;
    int var3;
    int var4;
    public MyClass(int var1, int var2, int var3, int var4){
        this.var1 = var1;
        this.var2 = var2;
        this.var3 = var3;
        this.var4 = var4;
    }
}

Is there a way to avoid writing this.varX = varX and save all the variables to the fields if the names are the same?

#c-sharp #oop