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PO
 

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  1. PO
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    <p>Unfortunately, the exact context is not quite clear to me, but I believe your code should look like this:</p> <pre><code>public interface IParameter&lt;T&gt; { bool Match(T entry); } public abstract class DataRepository&lt;T, TParameter&gt; where TParameter : IParameter&lt;T&gt; { public abstract IEnumerable&lt;T&gt; RetrieveAll(TParameter parameter1); public abstract bool Delete(TParameter parameter1); } // public interface IAudit {/* ... */} public interface IAuditSearch : IParameter&lt;IAudit&gt; {/* ... */} public class SearchRepository : DataRepository&lt;IAudit, IAuditSearch&gt; { public override bool Delete(IAuditSearch parameter1) { // iterate by collection items using parameter matching // CODE GOES HERE (DELETE ALL FOUND ENTRIES) } public override IEnumerable&lt;IAudit&gt; RetrieveAll(IAuditSearch parameter1) { // iterate by collection items using parameter matching // CODE GOES HERE (RETURN ALL FOUND ENTRIES) } } </code></pre> <p>Different IAuditSearch implementation will incapsulate a "search by different parameter" logic:</p> <pre><code>var guidSearchResult = repository.RetrieveAll( new GuidSearch(new Guid("00000000-0000-0000-0000-000000000000"))); var idRangeSearchResult = repository.RetrieveAll( new IDRangeSearch(1000, 2000)); </code></pre> <p>where GuidSearch and IDRangeSearch are implemented as:</p> <pre><code>public class GuidSearch : IAuditSearch { Guid ID; public GuidSearch(Guid id) { this.ID = id; } public bool Match(IAudit entry) { /* search implementation using ID(Guid)*/ throw new NotImplementedException(); } } public class IDRangeSearch : IAuditSearch { int StartID; int EndID; public IDRangeSearch(int startId, int endId) { this.StartID = startId; this.EndID = endId; } public bool Match(IAudit entry) { /* search implementation using ID range (StartID...EndID)*/ throw new NotImplementedException(); } } </code></pre>
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    1. POGetting warning, 'Type Parameter X Hides Interface X'
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    1. USDmitryG
    1. USDmitryG
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    1. COWhat if I want to pass different parameters to the different methods? What if there is also a retrieve method that needs a parameter of type Guid?
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      1. USCyfer13
    2. CO@Cyfer13: I have updated my answer with the more detailed explanation of my idea. Please review it and inform me whether or not this approach suits your needs.
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      1. USDmitryG
 

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