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POreturning a list<interface> in C#
 

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    <p>Edited after initial suggestions about using IEnumerable instead of List.</p> <p>I am trying to do this:</p> <pre><code>public interface IKPIDetails // Previously: interface IKPIDetails { string name {get; set;} //... } public abstract class BaseReport { public List&lt;IKPIDetails&gt; m_KPIDetails; // Previously: list&lt;IKPIDetails&gt; m_KPIDetails; public BaseReport() { m_KPIDetails = MakeReportDataStructure(); //... } public abstract List&lt;IKPIDetails&gt; MakeReportDataStructure(); // Previously: public abstract IKPIDetails MakeReportDataStructure(); //... } public class AirTemp_KPIDetails : NetVisSolution.Reports.IKPIDetails // Previously: protected class AirTemp_KPIDetails : IKPIDetails { #region IKPIDetails implementation private string _Name; public string Name { get { return _Name; } set { _Name = value; } } #endregion ... } public class SSAirTempSummaryReport : BaseReport { public SSAirTempSummaryReport() : base () { // Do any extra initialisation here m_reportName = "Air Temperature Summary Report"; } //It now complains on the declaration below at the word // MakeReportDataStructure() public override IEnumerable&lt;IKPIDetails&gt; MakeReportDataStructure() // Previously: public override List&lt;IKPIDetails&gt; MakeReportDataStructure() { List&lt;AirTemp_KPIDetails&gt; d = new List&lt;AirTemp_KPIDetails&gt;(); return d; // &lt;-- this is where it used to break } //... } </code></pre> <p>So I have a report data object interface and potentially multiple report data classes implementing this interface and adding their specific extra bits. And I have an abstract report class implementing generic report functionality and multiple derived classes that each use their own report data class.</p> <p>Unfortunately, when I try to create a list of my report detail structures in the derived class and pass it back to the base class as a list of the interface, it complains: </p> <pre><code>Cannot implicitly convert type 'System.Collections.Generic.List&lt;NetVisSolution.Reports.AirTemp_KPIDetails&gt;' to 'System.Collections.Generic.List&lt;NetVisSolution.Reports.IKPIDetails&gt;' </code></pre> <p>It won't let me do it implicitely or explicitly. Is there any way that I can do this?</p> <p>Thanks in advance,</p> <p>--- Alistair.</p>
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