RSCG_CompositeProvider by Ignat Andrei
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info
Name: RSCG_CompositeProvider
Interface to null object - common
Author: Ignat Andrei
NuGet: https://www.nuget.org/packages/RSCG_CompositeProvider/
https://www.nuget.org/packages/RSCG_CompositeProvider_common/
You can find more details at https://github.com/ignatandrei/RSCG_CompositeProvider
Source: https://github.com/ignatandrei/RSCG_CompositeProvider
Original Readme
note
RSCG_CompositeProvider
Composite provider from interface . Given multiple implementation of an interface , return data from each / one
Usage
Add the nuget package to your project
dotnet add package RSCG_CompositeProvider
dotnet add package RSCG_CompositeProviderCommon
or put in your csproj file
<ItemGroup>
<PackageReference Include="RSCG_CompositeProvider" Version="2025.218.2100" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
<PackageReference Include="RSCG_CompositeProvider_Common" Version="2025.218.2100" />
</ItemGroup>
Then if you have an interface like this
public interface IDataFrom
{
string Name { get; }
Task<string> KeyFromValue(string value, bool isKey);
}
and multiple implementation of the interface like this
class DataFromHttp : IDataValue
{
public string Name { get { return "DataFromHttp"; } set { } }
public async Task<string> KeyFromValue(string key, bool defaultValue)
{
var http=new HttpClient();
var result = await http.GetStringAsync("https://www."+ Guid.NewGuid().ToString()+".com/" + key);
return result;
}
}
class DataFromMemory : IDataValue
{
public string Name { get { return "DataFromMemory"; } set { } }
public async Task<string> KeyFromValue(string key, bool defaultValue)
{
await Task.Delay(1000);
return $"this is value for {key} from memory";
}
}
then you can call the composite provider to get data from all the implementation of the interface like this
IDataValue provider = new DataValue_CP(new DataFromHttp(), new DataFromMemory());
var result = await provider.KeyFromValue("test", false);
Console.WriteLine(result);
DataValue_CP realClass = (DataValue_CP)provider ;
var lastInterface = realClass.lastUsedInterface ?? -1;
Console.WriteLine("value was obtained from " + realClass.Get(lastInterface).Name);
About
note
Generate composite class from interface, using multiple sources
How to use
Example (source csproj, source files)
- CSharp Project
- Program.cs
- IDataValue.cs
- DataFromHttp.cs
This is the CSharp Project that references RSCG_CompositeProvider
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
<IsPackable>false</IsPackable>
<TreatWarningsAsErrors>true</TreatWarningsAsErrors>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="RSCG_CompositeProvider" Version="2025.218.2100" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
<PackageReference Include="RSCG_CompositeProvider_Common" Version="2025.218.2100" />
</ItemGroup>
<PropertyGroup>
<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
</PropertyGroup>
</Project>
This is the use of RSCG_CompositeProvider in Program.cs
using CP_Console;
IDataValue provider = new DataValue_CP(new DataFromHttp(), new DataFromMemory());
var result = await provider.KeyFromValue("test", false);
Console.WriteLine(result);
DataValue_CP realClass = (DataValue_CP)provider ;
var lastInterface = realClass.lastUsedInterface ?? -1;
Console.WriteLine("value was obtained from " + realClass.Get(lastInterface).Name);
This is the use of RSCG_CompositeProvider in IDataValue.cs
using RSCG_CompositeProvider_Common;
namespace CP_Console;
[CompositeProvider]
public interface IDataValue
{
public string Name { get; set; }
public Task<string> KeyFromValue(string key, bool defaultValue);
}
This is the use of RSCG_CompositeProvider in DataFromHttp.cs
namespace CP_Console;
class DataFromHttp : IDataValue
{
public string Name { get { return "DataFromHttp"; } set { } }
public async Task<string> KeyFromValue(string key, bool defaultValue)
{
var http=new HttpClient();
var result = await http.GetStringAsync("https://www."+ Guid.NewGuid().ToString()+".com/" + key);
return result;
}
}
class DataFromMemory : IDataValue
{
public string Name { get { return "DataFromMemory"; } set { } }
public async Task<string> KeyFromValue(string key, bool defaultValue)
{
await Task.Delay(1000);
return $"this is value for {key} from memory";
}
}
Generated Files
Those are taken from $(BaseIntermediateOutputPath)\GX
- TheAssemblyInfo.g.cs
- IDataValue_cp.cs
// <auto-generated/>
namespace Generated.CP_Console
{
public static class TheAssemblyInfo
{
public static readonly System.DateTime DateGeneratedUTC ;
public const string AssemblyName = "CP_Console";
public const string GeneratedNameNice = "Joseph Brodsky is feeling hard in Willemstad";
public const string GeneratedNameSmall = "hard-Joseph Brodsky";
public const string GeneratedName = "hard-Joseph Brodsky-Willemstad";
static TheAssemblyInfo(){
DateGeneratedUTC = System.DateTime.ParseExact("2025-07-24 04:41:22", "yyyy-MM-dd HH:mm:ss", null);
}
}
}
// <auto-generated>
// This code was generated by a tool :RSCG_CompositeProvider
// Runtime Version: Herta Müller is feeling amiable in George Town
// DateOfTool : 2025-02-18 17:23:31
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
//</auto-generated>
//------------------------------------------------------------------------------
/// <summary>
/// This static partial class is a composite provider of IDataValue objects.
///</summary>
#nullable enable
#pragma warning disable CS8603
#pragma warning disable CS8625
[global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
[global::System.CodeDom.Compiler.GeneratedCode("GeneratorName","2025.10218.11723.131")]
[System.Diagnostics.DebuggerDisplay("Name = {Name} ")]
public partial class DataValue_CP : global::CP_Console.IDataValue
{
public int? lastUsedInterface ;
private global::CP_Console.IDataValue[] values;
public DataValue_CP(params global::CP_Console.IDataValue[] values){
this.values=values;
}
public int Count{
get{
return values.Length;
}
}
public global::CP_Console.IDataValue Get(int nr){
return values[nr];
}
public string Name { get
{
lastUsedInterface = null;
foreach(var item in values){
lastUsedInterface =(lastUsedInterface ??-1)+1;
if(item == null)continue;
try{
return item.Name;
}
catch(Exception ){
//try with the next one
}
}
throw new System.Collections.Generic.KeyNotFoundException();
}
set
{
foreach(var item in values){
if(item == null)continue;
try{
item.Name = value;
}
catch(Exception ){
//try with the next one
}
}
}
}
public virtual async System.Threading.Tasks.Task<string> KeyFromValue(string key, bool defaultValue) {
lastUsedInterface =null;
foreach(var item in values){
lastUsedInterface =(lastUsedInterface ??-1)+1;
if(item == null)continue;
try{
var data= await item.KeyFromValue(key, defaultValue) ;
return data;
}
catch(Exception ){
//try with the next one
}
}
throw new System.Collections.Generic.KeyNotFoundException();
}
}
Useful
Download Example (.NET C#)
Share RSCG_CompositeProvider
https://ignatandrei.github.io/RSCG_Examples/v2/docs/RSCG_CompositeProvider
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Category "Interface" has the following generators:
3 CopyCat
9 ProxyGen
12 rscg_Interface_to_null_object
13 RSCG_Static