There is no argument given that corresponds to the required formal parameter

There is no argument given that corresponds to the required formal parameter of x

I am getting the following error message, I could not able to figure out how to handle that. I would be glad if anyone has any ideas.

There is no argument given that corresponds to the required formal parameter ‘parent’ of ‘MyViewModel.MyViewModel(MapViewModel)’.

2 Answers 2

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By default, if you don’t explicitly specify a constructor for your MyViewModel class, it will assume that a parameter-less one will be used. However if you have a single view model as you currently do, you will need to explicitly create a parameter-less one as well (as MVC only knows of the one that expects a parent parameter) :

Parameter-less constructors can also be incredibly helpful for MVC to know how to serialize content and bind it to your models as well.

Your MyViewModel doesn’t have a parameterless constructor.

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There is no argument given that corresponds to the required formal parameter

I don’t have any idea about this error please how I make that work?

2 Answers 2

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The error appears because the base class does not have a default constructor. You need to define a constructor in the derived class, which gets the same parameters as the constructor in the base class, and invokes that base class constructor using the base keyword as explained here

I could not open the screenshot of CenterExamen class. The error happens becauase your base class CenterExamen does not have a default constructor. It does not mean like you need to have a default constructor in the base class. In such cases, when inheriting a class, the inherited class should instantiate the base class by passing the required parameters.

How to fix «There is no argument given that corresponds to the required formal parameter ‘?

I was trying to do a class library in order to create objects and transfer their information into a database

The error shown is :

There is no argument given that corresponds to the required formal parameter ‘codproduto’ of ‘Produto.Produto(string, string, double, int, double)’

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Your child class needs to call the base-class constructor, or define a public parameter-less constructor. (the automatic one goes away when you define a constructor with parameters)

Software constructor needs to be:

if you declare a constructor with parameters in the base class, then the compiler will force you to call it in the derived class. This is what this (informative) error message is trying to tell you.

The reason is quite simple. When you want to create an instance of a derived class then the constructor of the base class will be called before it! So it will need all the parameters that you have defined.

To avoid a huge set of parameters for the Software constructor you can pass a base class object into it and the call the base constructor passing the necessary variables into it:

Resolve error ‘there is no argument given that corresponds to required formal parameter’?

I have following code where I’m getting error while compiling in C# visual Studio 2015.

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Fixing your bug:

The error occurs due to the lack of a parameterless constructor (or your lack of using the base() method in your constructor (just like user3185569 had said)

Fixing your code:

a. Conventions

There are some rules about common conventions that should apply to your code.

Members usually begin with either m or _ and then the memberName (camel casing).

Properties are usually written regularly as PropertyName and same applies to methods.

Parameters and variables are simply camel cased like parameterName

b. Access Modifiers

I think it would be the best to reference you to here to read some more about the topic: https://msdn.microsoft.com/en-us/library/ms173121.aspx

I’ve re-written your code to include all those tips (and also fix your issue)

Error: There is no argument given that corresponds to the required formal parameter

I’ve looked through the other answers for this question, but I honestly don’t know enough about coding to understand what they’re saying. I’m in an intro class and know the bare minimum. I’m supposed to make a car price calculator, using methods to find out which specifications were chosen to get the total price for the car, but keep receiving the error in the tile:

There is no argument given that corresponds to the required formal parameter

1 Answer 1

Error: There is no argument given that corresponds to the required formal parameter

Error occurs here:

Because the method getBasePrice(double typeChoice) expects a value of type double to be passed in whenever the method is invoked.

you can resolve it by passing in some data but MUST be of type double.

Currently, I am unaware of what specific data you want to pass into the method parameter. However, the solution above solves that issue, so all you have to do is pass the correct data to the method.

UPDATE

it seems that all you want to do is invoke the method getBasePrice() in order to get the corresponding value(s) within the method. In such situation, I’d suggest that you remove the method parameter and return the value depending on which button is clicked.