Method over loading in interface

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I have below interface.

internal Interface I1
{
IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters);
IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters, string str);
}

When I am implementing the I1 interface, in my class by overriding the methods in base class compiler is reaching the first method always though I am passing value with str variable only.

Could you please help me in this.

What I have tried:

When I am implementing the I1 interface, in my class by overriding the methods in base class compiler is reaching the first method always though I am passing value with str variable only.

Posted 7-Apr-21 20:45pm

nsvrao

Updated 8-Apr-21 6:10am

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BillWoodruff 8-Apr-21 4:10am

"compiler is reaching the first method always though I am passing value with str variable only."

doesn't make sense: both methods require: IDbDataParameter[] parameters

2 solutions

Solution 2

Thanks for your reply. could you please look the below code and suggest where I am missing.

The class implementation is like the below.
internal class C1 : I1
    {
    protected virtual IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters)
        {
        Debug.WriteLine("In 1 param");
        return new IDbDataParameter[0];
        }

    protected virtual IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters, string str)
        {
        Debug.WriteLine("In 2 param");
        return new IDbDataParameter[0];
        }

and the methods are getting over rided like below

internal class C2 
    {
    protected override IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters)
        {
        Debug.WriteLine("In 1 param");
        return new IDbDataParameter[0];
        }

    protected override IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters, string str)
        {
        Debug.WriteLine("In 2 param");
        return new IDbDataParameter[0];
        }

Posted 8-Apr-21 6:10am

nsvrao

Comments

Richard Deeming 9-Apr-21 4:46am

This is not a solution to your question.

Click the green "Improve question" link and update your question to add the new details. Click the "Have a Question or Comment?" button under Bill's solution, and ask him to take a look at your updated question. Then delete this non-solution.

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OriginalGriff · Accepted Answer · 2021-04-07T21:53:00

1) C# is case sensitive: Interface is not the same as interface - you need the latter.

2) If I correct that and implement your code, I get what I expect:

C#

internal class IDbDataParameter { }
internal interface I1
    {
    IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters);
    IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters, string str);
    }
internal class C1 : I1
    {
    public IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters)
        {
        Debug.WriteLine("In 1 param");
        return new IDbDataParameter[0];
        }

    public IDbDataParameter[] TransformParameters(IDbDataParameter[] parameters, string str)
        {
        Debug.WriteLine("In 2 param");
        return new IDbDataParameter[0];
        }
    }

C#

C1 c1 = new C1();
c1.TransformParameters(new IDbDataParameter[0]);
c1.TransformParameters(new IDbDataParameter[0], "Hello World");

In 1 param
In 2 param

Are you sure your original code compiled error free and you weren't running an earlier version?