Open-Harbor/dotnet-dynamic-linq
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better handling of null and simple expression null checking.

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This commit is contained in:
David Lebée 2018-04-14 23:26:42 -05:00
parent 904d3c9945
commit 62fa1a4d21
4 changed files with 20 additions and 7 deletions
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2
PoweredSoft.DynamicLinq.ConsoleApp/Program.cs
View File

@ -15,7 +15,7 @@ namespace PoweredSoft.DynamicLinq.ConsoleApp
static void Main(string[] args)
{
var selectTests = new SelectTests();
selectTests.SelectNullChecking();
selectTests.SelectNullChecking2();
}
}

4
PoweredSoft.DynamicLinq.Test/SelectTests.cs
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@ -82,6 +82,7 @@ namespace PoweredSoft.DynamicLinq.Test
{
var query = TestData.Authors.AsQueryable();
var qs = query.Select(t => new
{
CommentLikes = t.Posts == null ?
@ -128,7 +129,8 @@ namespace PoweredSoft.DynamicLinq.Test
{
t.NullChecking(true);
// this needs to be fixed.
t.PathToList("Comment.Post.Comments.CommentText", selectCollectionHandling: SelectCollectionHandling.Flatten);
t.Path("Comment.CommentText", "CommentText2");
//t.PathToList("Comment.Post.Comments.CommentText", selectCollectionHandling: SelectCollectionHandling.Flatten);
});
var b = querySelect.ToDynamicClassList();

6
PoweredSoft.DynamicLinq/Helpers/QueryableHelpers.cs
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@ -208,7 +208,11 @@ namespace PoweredSoft.DynamicLinq.Helpers
{
if (selectType == SelectTypes.Path)
{
return ResolvePathForExpression(parameter, path);
var parser = new ExpressionParser(parameter, path);
var resolver = new PathExpressionResolver(parser);
resolver.NullChecking = nullChecking;
resolver.Resolve();
return resolver.GetResultBodyExpression();
}
else if (selectType == SelectTypes.PathToList)
{

15
PoweredSoft.DynamicLinq/Resolver/PathExpressionResolver.cs
View File

@ -15,7 +15,6 @@ namespace PoweredSoft.DynamicLinq.Resolver
public ExpressionParser Parser { get; protected set; }
public Expression Result { get; protected set; }
public Type NullType { get; set; }
public PathExpressionResolver(ExpressionParser parser)
{
@ -55,7 +54,11 @@ namespace PoweredSoft.DynamicLinq.Resolver
if (group.Parent == null)
{
currentExpression = groupExpressionLambda;
currentExpression = groupExpression;
if (NullChecking != false)
currentExpression = CheckNullOnFirstGroup(group, currentExpression);
currentExpression = Expression.Lambda(currentExpression, group.Parameter);
continue;
}
@ -128,10 +131,14 @@ namespace PoweredSoft.DynamicLinq.Resolver
{
var path = string.Join(".", group.Pieces.Select(t => t.Name));
var whereExpression = QueryableHelpers.CreateConditionExpression(group.Parameter.Type, path,
ConditionOperators.Equal, null, QueryConvertStrategy.ConvertConstantToComparedPropertyOrField,
ConditionOperators.NotEqual, null, QueryConvertStrategy.ConvertConstantToComparedPropertyOrField,
parameter: group.Parameter, nullChecking: true);
var whereBodyExpression = (whereExpression as LambdaExpression).Body;
whereBodyExpression =Expression.Not(whereBodyExpression);
var nullType = currentExpression.Type;
Expression ifTrueExpression = null;
@ -143,7 +150,7 @@ namespace PoweredSoft.DynamicLinq.Resolver
}
else
{
ifTrueExpression = Expression.Default(NullType);
ifTrueExpression = Expression.Default(nullType);
}
return Expression.Condition(whereBodyExpression, ifTrueExpression, currentExpression, currentExpression.Type);