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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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PoweredSoft.DynamicLinq.ConsoleApp/App.config
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<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />
</startup>
</configuration>
PoweredSoft.DynamicLinq.ConsoleApp/PoweredSoft.DynamicLinq.ConsoleApp.csproj
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<?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>
PoweredSoft.DynamicLinq.ConsoleApp/Program.cs
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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();
}
}
}
PoweredSoft.DynamicLinq.ConsoleApp/Properties/AssemblyInfo.cs
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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")]