How to set values in a list of objects

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Posted on by RadekM

172

How can I create a list with objects containing a set of values to feed XML.

I do have declared : public List<line> line{ get; set; }

I need to create multiple objects of line for every orderline. I'm sure the problem is in IEnumerable declaration yet i don't knwo how to fix it. Right now the code ends at getEnumerator() since its null.

 protected mySchema.lines createlines()
    {
        mySchema.lines lines = new mySchema.lines();

        lines.zz = '3';
        lines.xx = '100.00';
       
        System.Collections.IEnumerable list = lines.line;
        System.Collections.IEnumerator enumerator = list.GetEnumerator();
 
        while  (enumerator.MoveNext())
        {
          line myline = enumerator.current;
          myline  = this.createline();
        }
        return FaWiersze;
    }

    protected mySchema.line createline()
    {

        mySchema.line line = new mySchema.line();

        line.qq = '1';
        line.ww = 'aaa';
        line.ee = 'bbb';
        line.rr = 'ccc.';

        return line;
    }

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Martin Dráb 237,898 Most Valuable Professional on at

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It seems that you forgot to provide some details.

Do youu mean that you have a C# class library with mySchema.lines class and you've created line property of type List<line>? (Note that you violated C# naming conventions.) And now you're trying to use it in X++. Did I guess everything correctly?

When you said that " code ends at getEnumerator() since its null", you likely meant list (lines.line) by it. It's indeed always empty, because you never set any value into it.

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RadekM 172 on at

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Yes, I have a C# class library and I try to set values for mySchema in X++ class using this library. I need to create a xml and recreate the same structure with different values. Thats why I declared the List<line> but I don't know how to correctly create it. How can I set it correct? It always overwrittes the provious created object or like above I failed on creating the list.line.

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Martin Dráb 237,898 Most Valuable Professional on at

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If your goal is creating an object, than trying to iterate the collection has nothing to do with your goal and the fix for this part of code is throwing it away.

X++ has a very limited support for generics (and Microsoft seems to pretend that there is none, likely because they did it just partially and then stopped the investment), therefore the best thing you can do is designing your class in a way that can be easily consumed from X++. For example, initialize the value of line property when creating lines object and provide AddLine(line) method to add a line from X++. Or use a non-generic collection.

In fact, it's possible to create an instance of a generic collection (as I showed in Generic types in X++ (AX 7)), but as I said, a better approach is designing your class in a way that you don't need to work with generic types in X++.

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RadekM 172 on at

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Well I tried te below. Yet I can't assign the list or array to my lines.line. As far I know array is non generic but still I cant make it work.

The errors I get it Generic.List

Error Cannot implicitly convert from type 'System.Collections.Generic.List' to type 'System.Collections.Generic.List'1.
Error Cannot implicitly convert from type 'Array' to type 'System.Array'.

Array Arr = new Array (Types::Class); int j = 1; while(j <= 3) { Arr.value(j, this.createline()); j ; } lines.line = Arr; System.Collections.Generic.List MyLine = new System.Collections.Generic.List(); MyLine.Add(this.createline()); MyLine.Add(this.createline()); MyLine.Add(this.createline()); lines.line = MyLine;

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Martin Dráb 237,898 Most Valuable Professional on at

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The first part of your code makes no sense. The Array class in X++ is a completely different type than your List<line>. That's what the second error message is about.

Where do you get the first error?

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RadekM 172 on at

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Sorry forgot to mention that for the test case I changed List<line> to Array line. The first part (line 1-9) is for Array line and the second part is for List<line> just added it all together so it may look confusing.

Both error occours on the same line, when I try to set the value lines.line = Arr; / lines.line = MyLine;

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Martin Dráb 237,898 Most Valuable Professional on at

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If I understand you correctly, you're saying that the type of lines.is List<line>, but the following code fails at the third line with "Cannot implicitly convert from type 'System.Collections.Generic.List' to type 'System.Collections.Generic.List'1". Is that correct?

mySchema.lines lines = new mySchema.lines(); System.Collections.Generic.List MyLine = new System.Collections.Generic.List(); lines.line = MyLine;

Should it actually be List<myschema.line> instead of List<line>?

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RadekM 172 on at

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The lines class looks like below. And yes, the code fails on line 3

Edit. chaning to MySchema.line actually didnt changed, the error is still the same

mySchema.lines lines = new mySchema.lines(); System.Collections.Generic.List MyLine = new System.Collections.Generic.List(); lines.line = MyLine;

[XmlType(TypeName = "Lines")] public class Lines { public String LinesNum { get; set; } [XmlElement(ElementName = "Line")] public List Line{ get; set; } }

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Martin Dráb 237,898 Most Valuable Professional on at

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CLR Interop is case-senstive therefore mySchema and MySchema are twodifferent names. The same applies to Lines vs lines and Line vs line.

Assuming that the namespace is called mySchema, the code should look like this, if you insist on ignoring my recommendation to avoid generics in X :

mySchema.Lines lines = new mySchema.Lines(); System.Collections.Generic.List myLine = new System.Collections.Generic.List(); lines.Line = myLine;

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RadekM 172 on at

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I have all names remade so it;s perfectly ideantical. Yet the problem is still there.

What other non generic type could I use to archive my goal?

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