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well advanced to start new way of null checking.

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This commit is contained in:
David Lebée 2018-03-26 16:14:01 -05:00
parent 10f15b802c
commit b80e9e433c
10 changed files with 228 additions and 11 deletions
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6
PoweredSoft.DynamicLinq.ConsoleApp/App.config Normal file
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@ -0,0 +1,6 @@
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
</startup>
</configuration>

66
PoweredSoft.DynamicLinq.ConsoleApp/PoweredSoft.DynamicLinq.ConsoleApp.csproj Normal file
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@ -0,0 +1,66 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{A166BD89-7BF3-475B-871F-294B8A420D9E}</ProjectGuid>
<OutputType>Exe</OutputType>
<RootNamespace>PoweredSoft.DynamicLinq.ConsoleApp</RootNamespace>
<AssemblyName>PoweredSoft.DynamicLinq.ConsoleApp</AssemblyName>
<TargetFrameworkVersion>v4.6.2</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\PoweredSoft.DynamicLinq.Dal\PoweredSoft.DynamicLinq.Dal.csproj">
<Project>{c16927e7-1358-4b9d-bdd7-149e505de6cc}</Project>
<Name>PoweredSoft.DynamicLinq.Dal</Name>
</ProjectReference>
<ProjectReference Include="..\PoweredSoft.DynamicLinq.Test\PoweredSoft.DynamicLinq.Test.csproj">
<Project>{6f5c80f0-9045-4098-913f-7bdad135e6dd}</Project>
<Name>PoweredSoft.DynamicLinq.Test</Name>
</ProjectReference>
<ProjectReference Include="..\PoweredSoft.DynamicLinq\PoweredSoft.DynamicLinq.csproj">
<Project>{5bb7e50f-8b40-4512-88dc-4b3bd89c9a5e}</Project>
<Name>PoweredSoft.DynamicLinq</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>

50
PoweredSoft.DynamicLinq.ConsoleApp/Program.cs Normal file
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using PoweredSoft.DynamicLinq.Helpers;
using PoweredSoft.DynamicLinq.Test;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
namespace PoweredSoft.DynamicLinq.ConsoleApp
{
public class Program
{
static void Main(string[] args)
{
var type = typeof(Dal.Pocos.Author);
var param = Expression.Parameter(type);
var path = "Posts.Comments.Id";
var expr = ResolveSelectExpression(param, path, SelectCollectionHandling.Flatten);
var expr2 = ResolveSelectExpression(param, path, SelectCollectionHandling.Flatten, true);
}
public static Expression ResolveSelectExpression(ParameterExpression param, string path, SelectCollectionHandling selectCollectionHandling = SelectCollectionHandling.LeaveAsIs, bool nullChecking = false)
{
var notCheckNullExpression = QueryablePathHelpers.NavigatePath(param, path,
(before, member, isFirst, isLast) => member,
(before, member, isFirst, isLast) => member,
(parent, innerExpression, innerExpressionLambda) =>
{
var listGenericArgumentType = parent.Type.GetGenericArguments().First();
Expression ret = null;
if (selectCollectionHandling == SelectCollectionHandling.LeaveAsIs || !QueryableHelpers.IsGenericEnumerable(innerExpression))
ret = Expression.Call(typeof(Enumerable), "Select", new Type[] { listGenericArgumentType, innerExpression.Type }, parent, innerExpressionLambda);
else
ret = Expression.Call(typeof(Enumerable), "SelectMany", new Type[] { listGenericArgumentType, innerExpression.Type.GenericTypeArguments.First() }, parent, innerExpressionLambda);
return ret;
}
);
if (!nullChecking)
return notCheckNullExpression;
var type = notCheckNullExpression.Type;
throw new NotSupportedException();
}
}
}

36
PoweredSoft.DynamicLinq.ConsoleApp/Properties/AssemblyInfo.cs Normal file
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using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("PoweredSoft.DynamicLinq.ConsoleApp")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("PoweredSoft.DynamicLinq.ConsoleApp")]
[assembly: AssemblyCopyright("Copyright © 2018")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("a166bd89-7bf3-475b-871f-294b8a420d9e")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

6
PoweredSoft.DynamicLinq.Test/SelectTests.cs
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@ -57,8 +57,8 @@ namespace PoweredSoft.DynamicLinq.Test
.Select(t => .Select(t =>
{ {
t.Path("Id"); t.Path("Id");
t.PathToList("Bs.FirstNames", "FirstNames", SelectCollectionHandling.SelectMany); t.PathToList("Bs.FirstNames", "FirstNames", SelectCollectionHandling.Flatten);
t.PathToList("Bs.FirstNames", "FirstNamesLists", SelectCollectionHandling.Select); t.PathToList("Bs.FirstNames", "FirstNamesLists", SelectCollectionHandling.LeaveAsIs);
}) })
.ToDynamicClassList(); .ToDynamicClassList();
@ -94,7 +94,7 @@ namespace PoweredSoft.DynamicLinq.Test
var querySelect = query.Select(t => var querySelect = query.Select(t =>
{ {
t.NullChecking(true); t.NullChecking(true);
t.PathToList("Posts.Comments", selectCollectionHandling: SelectCollectionHandling.SelectMany); t.PathToList("Posts.Comments", selectCollectionHandling: SelectCollectionHandling.Flatten);
}); });
var list = querySelect.ToDynamicClassList(); var list = querySelect.ToDynamicClassList();

12
PoweredSoft.DynamicLinq.sln
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@ -1,15 +1,17 @@
 
Microsoft Visual Studio Solution File, Format Version 12.00 Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15 # Visual Studio 15
VisualStudioVersion = 15.0.27130.2010 VisualStudioVersion = 15.0.27130.2036
MinimumVisualStudioVersion = 10.0.40219.1 MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq", "PoweredSoft.DynamicLinq\PoweredSoft.DynamicLinq.csproj", "{5BB7E50F-8B40-4512-88DC-4B3BD89C9A5E}" Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PoweredSoft.DynamicLinq", "PoweredSoft.DynamicLinq\PoweredSoft.DynamicLinq.csproj", "{5BB7E50F-8B40-4512-88DC-4B3BD89C9A5E}"
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq.Test", "PoweredSoft.DynamicLinq.Test\PoweredSoft.DynamicLinq.Test.csproj", "{6F5C80F0-9045-4098-913F-7BDAD135E6DD}" Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq.Test", "PoweredSoft.DynamicLinq.Test\PoweredSoft.DynamicLinq.Test.csproj", "{6F5C80F0-9045-4098-913F-7BDAD135E6DD}"
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq.Dal", "PoweredSoft.DynamicLinq.Dal\PoweredSoft.DynamicLinq.Dal.csproj", "{C16927E7-1358-4B9D-BDD7-149E505DE6CC}" Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq.Dal", "PoweredSoft.DynamicLinq.Dal\PoweredSoft.DynamicLinq.Dal.csproj", "{C16927E7-1358-4B9D-BDD7-149E505DE6CC}"
EndProject EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq.EntityFramework", "PoweredSoft.DynamicLinq.EntityFramework\PoweredSoft.DynamicLinq.EntityFramework.csproj", "{82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}" Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PoweredSoft.DynamicLinq.EntityFramework", "PoweredSoft.DynamicLinq.EntityFramework\PoweredSoft.DynamicLinq.EntityFramework.csproj", "{82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PoweredSoft.DynamicLinq.ConsoleApp", "PoweredSoft.DynamicLinq.ConsoleApp\PoweredSoft.DynamicLinq.ConsoleApp.csproj", "{A166BD89-7BF3-475B-871F-294B8A420D9E}"
EndProject EndProject
Global Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution GlobalSection(SolutionConfigurationPlatforms) = preSolution
@ -33,6 +35,10 @@ Global
{82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}.Debug|Any CPU.Build.0 = Debug|Any CPU {82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}.Debug|Any CPU.Build.0 = Debug|Any CPU
{82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}.Release|Any CPU.ActiveCfg = Release|Any CPU {82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}.Release|Any CPU.ActiveCfg = Release|Any CPU
{82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}.Release|Any CPU.Build.0 = Release|Any CPU {82DADDB0-4A69-4E19-82AD-E73ABC8F1B4A}.Release|Any CPU.Build.0 = Release|Any CPU
{A166BD89-7BF3-475B-871F-294B8A420D9E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{A166BD89-7BF3-475B-871F-294B8A420D9E}.Debug|Any CPU.Build.0 = Debug|Any CPU
{A166BD89-7BF3-475B-871F-294B8A420D9E}.Release|Any CPU.ActiveCfg = Release|Any CPU
{A166BD89-7BF3-475B-871F-294B8A420D9E}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection EndGlobalSection
GlobalSection(SolutionProperties) = preSolution GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE HideSolutionNode = FALSE

4
PoweredSoft.DynamicLinq/Constants.cs
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@ -55,8 +55,8 @@ namespace PoweredSoft.DynamicLinq
public enum SelectCollectionHandling public enum SelectCollectionHandling
{ {
Select, LeaveAsIs,
SelectMany Flatten
} }
internal static class Constants internal static class Constants

2
PoweredSoft.DynamicLinq/Fluent/Select/SelectBuilder.cs
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@ -141,7 +141,7 @@ namespace PoweredSoft.DynamicLinq.Fluent
return this; return this;
} }
public SelectBuilder PathToList(string path, string propertyName = null, SelectCollectionHandling selectCollectionHandling = SelectCollectionHandling.Select) public SelectBuilder PathToList(string path, string propertyName = null, SelectCollectionHandling selectCollectionHandling = SelectCollectionHandling.LeaveAsIs)
{ {
if (propertyName == null) if (propertyName == null)
propertyName = path.Split('.').LastOrDefault(); propertyName = path.Split('.').LastOrDefault();

4
PoweredSoft.DynamicLinq/Helpers/QueryableHelpers.cs
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@ -270,7 +270,7 @@ namespace PoweredSoft.DynamicLinq.Helpers
var innerExpression = InternalResolvePathExpression(step + 1, innerParam, parts.Skip(1).ToList(), selectCollectionHandling, nullChecking); var innerExpression = InternalResolvePathExpression(step + 1, innerParam, parts.Skip(1).ToList(), selectCollectionHandling, nullChecking);
var lambda = Expression.Lambda(innerExpression, innerParam); var lambda = Expression.Lambda(innerExpression, innerParam);
if (selectCollectionHandling == SelectCollectionHandling.Select) if (selectCollectionHandling == SelectCollectionHandling.LeaveAsIs)
ret = Expression.Call(typeof(Enumerable), "Select", new Type[] { listGenericArgumentType, innerExpression.Type }, memberExpression, lambda); ret = Expression.Call(typeof(Enumerable), "Select", new Type[] { listGenericArgumentType, innerExpression.Type }, memberExpression, lambda);
else else
ret = Expression.Call(typeof(Enumerable), "SelectMany", new Type[] { listGenericArgumentType, innerExpression.Type.GenericTypeArguments.First() }, memberExpression, lambda); ret = Expression.Call(typeof(Enumerable), "SelectMany", new Type[] { listGenericArgumentType, innerExpression.Type.GenericTypeArguments.First() }, memberExpression, lambda);
@ -527,7 +527,7 @@ namespace PoweredSoft.DynamicLinq.Helpers
return result; return result;
} }
public static bool IsGenericEnumerable(MemberExpression member) => IsGenericEnumerable(member.Type); public static bool IsGenericEnumerable(Expression member) => IsGenericEnumerable(member.Type);
public static bool IsGenericEnumerable(Type type) public static bool IsGenericEnumerable(Type type)
{ {
if (!type.IsGenericType) if (!type.IsGenericType)

53
PoweredSoft.DynamicLinq/Helpers/QueryablePathHelpers.cs Normal file
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@ -0,0 +1,53 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
namespace PoweredSoft.DynamicLinq.Helpers
{
public static class QueryablePathHelpers
{
public delegate Expression SimplePathNavigated(Expression before, MemberExpression member, bool isFirst, bool isLast);
public delegate Expression CollectionPathNavigated(Expression before, MemberExpression member, bool isFirst, bool isLast);
public delegate Expression CollectionHandling(Expression parent, Expression innerExpression, LambdaExpression innerExpressionLambda);
internal static Expression InternalNavigatePath(Expression before, List<string> parts, SimplePathNavigated simple, CollectionPathNavigated collection, CollectionHandling collectionHandling)
{
var isFirst = before is ParameterExpression;
var isLast = parts.Count() == 1;
var currentExpression = Expression.PropertyOrField(before, parts.First());
var isEnumerable = QueryableHelpers.IsGenericEnumerable(currentExpression);
// allow interaction through callback.
var alteredExpression = isEnumerable ? simple(before, currentExpression, isFirst, isLast) : collection(before, currentExpression, isFirst, isLast);
// if its last we are done :)
if (isLast)
return alteredExpression;
// not enumerable pretty simple.
if (!isEnumerable)
return InternalNavigatePath(alteredExpression, parts.Skip(1).ToList(), simple, collection, collectionHandling);
// enumerable.
var listGenericArgumentType = alteredExpression.Type.GetGenericArguments().First();
// sub param.
var innerParameter = Expression.Parameter(listGenericArgumentType);
var innerExpr = InternalNavigatePath(innerParameter, parts.Skip(1).ToList(), simple, collection, collectionHandling);
var lambda = Expression.Lambda(innerExpr, innerParameter);
var collectionHandlingResult = collectionHandling(alteredExpression, innerExpr, lambda);
return collectionHandlingResult;
}
public static Expression NavigatePath(ParameterExpression param, string path,
SimplePathNavigated simple,
CollectionPathNavigated collection,
CollectionHandling collectionHandling)
{
var parts = path.Split('.').ToList();
return InternalNavigatePath(param, parts, simple, collection, collectionHandling);
}
}
}