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Customer Filter Operator w/o deferred execution

3_linq_queries
jason.zhu 2021-02-25 13:31:24 +11:00
parent 512d8304e7
commit 46766de185
4 changed files with 34 additions and 3 deletions
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17
Queries/Movie.cs
View File

@ -1,9 +1,22 @@
namespace Queries using System;
namespace Queries
{ {
public class Movie public class Movie
{ {
public string Title { get; set; } public string Title { get; set; }
public float Rating { get; set; } public float Rating { get; set; }
public int Year { get; set; } private int _year;
public int Year {
get
{
Console.WriteLine($"Returning {_year} for {Title}");
return _year;
}
set
{
_year = value;
}
}
} }
} }

2
Queries/MyLInq.cs → Queries/MyLinq.cs
View File

@ -5,7 +5,7 @@ using System.Reflection;
namespace Queries namespace Queries
{ {
public static class MyLInq public static class MyLinq
{ {
public static IEnumerable<T> Filter<T>(this IEnumerable<T> source, public static IEnumerable<T> Filter<T>(this IEnumerable<T> source,
Func<T, bool> predicate) Func<T, bool> predicate)

4
Queries/Program.cs
View File

@ -17,6 +17,8 @@ namespace Queries
}; };
// filter operator from LINQ // filter operator from LINQ
Console.WriteLine();
Console.WriteLine("Filter operator from LINQ");
var query = movies.Where(m => m.Year > 2000); var query = movies.Where(m => m.Year > 2000);
foreach (var movie in query) foreach (var movie in query)
{ {
@ -24,6 +26,8 @@ namespace Queries
} }
// filter operator using customized Filter extension // filter operator using customized Filter extension
Console.WriteLine();
Console.WriteLine("Customerized Filter operator");
var query2 = movies.Filter(m => m.Year > 2000); var query2 = movies.Filter(m => m.Year > 2000);
foreach (var movie in query2) foreach (var movie in query2)
{ {

14
linq-fundamentals.sln
View File

@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Features", "Features\Featur
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Queries", "Queries\Queries.csproj", "{FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}" Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Queries", "Queries\Queries.csproj", "{FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}"
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "yield_test", "yield_test\yield_test.csproj", "{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}"
EndProject
Global Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU Debug|Any CPU = Debug|Any CPU
@ -58,5 +60,17 @@ Global
{FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}.Release|x64.Build.0 = Release|Any CPU {FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}.Release|x64.Build.0 = Release|Any CPU
{FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}.Release|x86.ActiveCfg = Release|Any CPU {FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}.Release|x86.ActiveCfg = Release|Any CPU
{FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}.Release|x86.Build.0 = Release|Any CPU {FB21B6B5-70C3-444E-A1D1-2CCD3F575DD9}.Release|x86.Build.0 = Release|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Debug|Any CPU.Build.0 = Debug|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Debug|x64.ActiveCfg = Debug|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Debug|x64.Build.0 = Debug|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Debug|x86.ActiveCfg = Debug|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Debug|x86.Build.0 = Debug|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Release|Any CPU.ActiveCfg = Release|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Release|Any CPU.Build.0 = Release|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Release|x64.ActiveCfg = Release|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Release|x64.Build.0 = Release|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Release|x86.ActiveCfg = Release|Any CPU
{790E4D64-D90A-4289-9F5D-35B6A2BDBE5B}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection EndGlobalSection
EndGlobal EndGlobal