How to pass class object as parameter

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Hi,

I want to make a soap request and assign values to productlist which accepts product class as a parameter

[System.Xml.Serialization.XmlArrayItemAttribute("PRODUCT", Form=System.Xml.Schema.XmlSchemaForm.Unqualified, IsNullable=false)]
public product[] PRODUCTLIST {
    get {
        return this.pRODUCTLISTField;
    }
    set {
        this.pRODUCTLISTField = value;
        this.RaisePropertyChanged("PRODUCTLIST");
    }
}

I am trying to set the values in this way but it is not assigning the values

sup.PRODUCTLIST[0] = new Supcancel.product
                {
                    Name = "Mouse",
                    Price = 20,
                    Size = "Small",
                    date = date
                };

the error i am getting is

object reference not set to instance of an object

Need help

Thanks in advance

What I have tried:

i have tride this way also

sup.PRODUCTLIST[0].Name = "Mouse";
               sup.PRODUCTLIST[0].Price = 20;
               sup.PRODUCTLIST[0].Size = "Small";
               sup.PRODUCTLIST[0].date = date;

Posted 27-Sep-19 13:45pm

Member 14583379

Updated 28-Sep-19 15:47pm

v2

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Afzaal Ahmad Zeeshan 27-Sep-19 20:39pm

What error do you get?

Member 14583379 28-Sep-19 1:20am

i am getting this error object reference not set to instance of an object

DerekT-P 28-Sep-19 16:15pm

what is the value of sup.PRODUCTLIST[0] before you do the above assignment? Because that's all you're doing - assigning a new value to the first element in the sup.PRODUCTLIST array. Have you declared the size of that array? Or did you mean this to be a list? In which case you'll need to ADD it to the (defined) list... The "not set to an instance of an object" is referring the left-hand side, not the right!

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Afzaal Ahmad Zeeshan · Answer 1 · 2019-09-28T15:47:00

Since you are getting a null reference exception, the solution is simply:

C#

// Create an array of products that it will use.
sup.PRODUCTLIST = new product[10];

Since you would be adding the elements at runtime, I would highly recommend using other generic types that can accommodate new elements without a need of re-allocation on your part, such as List<T>.

The code would become:

C#

// Change Product to product, if you really think naming should be that way. 
public List<Product> PRODUCTLIST {
    get {
        return this.pRODUCTLISTField;
    }
    set {
        this.pRODUCTLISTField = value;
        this.RaisePropertyChanged("PRODUCTLIST");
    }
}

Then, in the code you should do this,

C#

sup.PRODUCTLIST = new List<Product>();

This is necessary in C#, otherwise NullReferenceException will always be raised and your program will crash.

Check out these past posts of mine to learn more on this:
Null reference exception[^]
Problem with 'Null Reference' Error while creating Class instances[^]
how to handle null reference and out of bound exceptions[^]
Object reference not set to and instance of an object[^]
What Is A Null Error in Code Execution[^]