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Commented Issue: Included Test Examples Do Not Work [8296]

warloki — Fri, 30 Nov 2012 16:17:36 GMT

Commented Issue: Included Test Examples Do Not Work [8296]

warloki — Fri, 30 Nov 2012 16:00:00 GMT

This is one of the test cases (ported to run in a console project for quick testing):
---
var builder = new StringBuilder();
var context = new TextContext<Book>(new StringWriter(builder));

var query = from book in context
select book;

Console.WriteLine(query.Count());
---
This generates an error: "Error 41 Could not find an implementation of the query pattern for source type 'LinqExtender.Tests.TextContext<LinqExtender.Tests.Book>'. 'Select' not found."

Not sure what you were thinking, but a proper provider implementation is required before this LINQ should work...?
Comments: After a few hours of struggling I finally found an answer. I'm not so familiar with CLR to explain the behaviour. Maybe you could help. The error was disappeared after I changed the namespace of the TextContext to start with 'LinqExtender' and do the same with Test class where the context was queried. You could reproduce the issue. Just change the namespace of the Test project and containing classes to something different from 'LinqExtender.XXX'.

Commented Issue: Included Test Examples Do Not Work [8296]

warloki — Fri, 30 Nov 2012 15:20:00 GMT

This is one of the test cases (ported to run in a console project for quick testing):
---
var builder = new StringBuilder();
var context = new TextContext<Book>(new StringWriter(builder));

var query = from book in context
select book;

Console.WriteLine(query.Count());
---
This generates an error: "Error 41 Could not find an implementation of the query pattern for source type 'LinqExtender.Tests.TextContext<LinqExtender.Tests.Book>'. 'Select' not found."

Not sure what you were thinking, but a proper provider implementation is required before this LINQ should work...?
Comments: Have the same issue. I cannot understand its nature. I have absolutely identical context classes: TextContext<T> : ExpressionVisitor, IQueryContext<T> One is from the source code test project, another one created by myself. In case when building my class I have the same error message. Looks like my compiler cannot understand how the context could enumerate the items.

Commented Issue: Included Test Examples Do Not Work [8296]

mehfuzh — Fri, 17 Dec 2010 12:20:24 GMT

This is one of the test cases (ported to run in a console project for quick testing):
---
var builder = new StringBuilder();
var context = new TextContext<Book>(new StringWriter(builder));

var query = from book in context
select book;

Console.WriteLine(query.Count());
---
This generates an error: "Error 41 Could not find an implementation of the query pattern for source type 'LinqExtender.Tests.TextContext<LinqExtender.Tests.Book>'. 'Select' not found."

Not sure what you were thinking, but a proper provider implementation is required before this LINQ should work...?
Comments: Accordingly, I created an console project referenced LinqExtender.Tests (Since i will be using the bits from the test project) and LinqExtender project and wrote the following: var builder = new StringBuilder(); var context = new TextContext<Book>(new StringWriter(builder)); var query = from book in context select book; Console.WriteLine(query.Count()); Console.WriteLine(builder); Console.ReadLine(); It prints : 0 select * from book Here is the link for github project: http://mehfuzh.github.com/LinqExtender/ Hope that helps,

Commented Issue: Included Test Examples Do Not Work [8296]

mehfuzh — Fri, 17 Dec 2010 12:06:14 GMT

Commented Issue: Included Test Examples Do Not Work [8296]

mehfuzh — Fri, 17 Dec 2010 12:04:12 GMT

This is one of the test cases (ported to run in a console project for quick testing):
---
var builder = new StringBuilder();
var context = new TextContext<Book>(new StringWriter(builder));

var query = from book in context
select book;

Console.WriteLine(query.Count());
---
This generates an error: "Error 41 Could not find an implementation of the query pattern for source type 'LinqExtender.Tests.TextContext<LinqExtender.Tests.Book>'. 'Select' not found."

Not sure what you were thinking, but a proper provider implementation is required before this LINQ should work...?
Comments: Hi James, Executing the query, it will just populate the builder. Here query.Count() will be 0, since in the query context i am returning an empty list. The purpose of the test project is to assert if the query is generated as it is expected. But yes it should not throw such exception as well. Therefore, i will take a look. Just to be sure, i guess you are using the version from github (source / download) not the one from source tab. Sorry for any inconvenience

Commented Issue: Included Test Examples Do Not Work [8296]

mehfuzh — Fri, 17 Dec 2010 12:01:37 GMT

This is one of the test cases (ported to run in a console project for quick testing):
---
var builder = new StringBuilder();
var context = new TextContext<Book>(new StringWriter(builder));

var query = from book in context
select book;

Console.WriteLine(query.Count());
---
This generates an error: "Error 41 Could not find an implementation of the query pattern for source type 'LinqExtender.Tests.TextContext<LinqExtender.Tests.Book>'. 'Select' not found."

Not sure what you were thinking, but a proper provider implementation is required before this LINQ should work...?
Comments: Hi James, Executing the query, it will just populate the builder. Here query.Count() will be 0, since in the query context i am returning an empty list. The purpose of the test project is to assert if the expected is generated as it is expected. But yes it should not throw such exception as well. Therefore, i will take a look. Just to be sure, i guess you are using the version from github not from the source tab. Regards, Mehfuz

Edited Issue: Included Test Examples Do Not Work [8296]

jamesnw — Mon, 13 Dec 2010 03:48:55 GMT

Created Issue: Included Test Examples Do Not Work [8296]

jamesnw — Mon, 13 Dec 2010 03:47:48 GMT

This is one of the test cases:
---
var builder = new StringBuilder();
var context = new TextContext<Book>(new StringWriter(builder));

var query = from book in context
select book;

Console.WriteLine(query.Count());
---
This generates an error: "Error 41 Could not find an implementation of the query pattern for source type 'LinqExtender.Tests.TextContext<LinqExtender.Tests.Book>'. 'Select' not found."

Not sure what you were thinking, but a proper provider implementation is required before this LINQ should work...?

Closed Issue: Disjunction clauses drop last value [8295]

mehfuzh — Wed, 08 Dec 2010 17:56:44 GMT

Commented Issue: Disjunction clauses drop last value [8295]

mehfuzh — Wed, 08 Dec 2010 17:56:04 GMT

Commented Issue: Disjunction clauses drop last value [8295]

purujit — Sat, 13 Nov 2010 01:07:29 GMT

I have a query like this
var result = eQuery.Where(email => email.subject == "terminal").Where(email => email.sender == "X" || email.sender == "Y" || email.sender == "Z");

As you can see in the last Where part there are 3 values joined with OR and in my select item I see only the first 2 being passed.
It does not repro if the disjunction Where is the first Where clause. It seems like a bug to me.
Comments: Okay, I have identified a potential solution. In the createquery method, if you already have a node that means you have already processed a Where call earlier. If the current call is another Where you need to make the AND the previous expression tree with the current Where method's expression tree. That's what I am trying to do by adding a new parent Node of type AND. So far it worked for the queries I threw at it. TreeNode parentNode = null; // Create a new bucket when Query<T>.Execute is called or it is empty for current type. if ((!Buckets.ContainsKey(typeof(T).FullName)) || Buckets.Current.IsAlreadyProcessed) { Buckets.Current = BucketImpl<T>.NewInstance.Describe(); } else if (curentMethodcall.Method.Name == MethodNames.Where) { parentNode = ProcessCurrentNode(null, CompoundOperator.And); } Buckets.Current.IsAsc = curentMethodcall.Method.Name == MethodNames.Orderbydesc ? false : true; if (curentMethodcall.Arguments.Count == 2) { VisitExpression<TS>(curentMethodcall.Arguments[curentMethodcall.Arguments.Count - 1], 0, parentNode); } }

Commented Issue: Disjunction clauses drop last value [8295]

purujit — Thu, 11 Nov 2010 08:15:55 GMT

Commented Issue: Disjunction clauses drop last value [8295]

purujit — Thu, 11 Nov 2010 07:58:15 GMT

Commented Issue: Disjunction clauses drop last value [8295]

mehfuzh — Tue, 09 Nov 2010 12:44:06 GMT

Created Issue: Disjunction clauses drop last value [8295]

purujit — Tue, 09 Nov 2010 01:10:46 GMT

Created Issue: LinqExtender and WCF Data Services (OData) [8294]

burningice — Mon, 10 May 2010 14:20:52 GMT

I have created a Linq-provider with LinqExtender and wanted to expose it as a OData feed. I keep getting a Null Reference exception from the underlying system (WCF) and after alot of debugging it seems like the issue is LinqExtender wrapping the "real" object that should be in the IEnumerable. Its the only difference i can see between the result of a query against my provider an regular Linq for Objects.

I've also created a question about this on stackoverflow: http://stackoverflow.com/questions/2800229/using-linqextender-to-make-odata-feed-fails

Commented Issue: Multiple calls to Select causes exception [6864]

mehfuzh — Thu, 11 Mar 2010 19:59:39 GMT

I have written a Linq provider for the Google Base API and it mostly works very well. However, if I do a query like:

var q = context.GoogleProductItems.Select(p => new { p.Author, p.Description, p.Price }).Select(p => new { p.Author, p.Price })

An exception is thrown when I enumerate the query results. The exception detail is

System.InvalidCastException was unhandled
Message="Unable to cast object of type 'System.Linq.Expressions.Expression`1[System.Func`2[CustomLinqProviderSample.GoogleProductItem,<>f__AnonymousType0`3[System.String,System.String,System.Decimal]]]' to type 'System.Linq.Expressions.Expression`1[System.Func`2[CustomLinqProviderSample.GoogleProductItem,<>f__AnonymousType1`2[System.String,System.Decimal]]]'."
Source="LinqExtender"
StackTrace:
at LinqExtender.ProjectedQuery`2.ProcessGenericList() in C:\Source\Sage 200 Architecture Team\TFS Projects\Mikes Projects\New Linq.Google\Linq Extender\ProjectedQuery.cs:line 49
at LinqExtender.ProjectedQuery`2.GetEnumerator() in C:\Source\New Linq.Google\Linq Extender\ProjectedQuery.cs:line 36
at GoogleTestConsole.Program.Main(String[] args) in C:\Source\New Linq.Google\GoogleTestConcole\Program.cs:line 20
at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:

The problem I think is that QueryExtension.GetUnaryExpressionFromMethodCall is not properly resolving the expression. It ends up returning the lambda expression from the first call to Select. The body of this expression is AnonymousType0 <string, string, decimal> whereas the second type argument for the ProjectedQuery<T,S> is AnonymousType1 <string, decimal>
Comments: ** Comment from web user: mehfuzh **

Hi Sorry for being late,
I will try it and come back to you in a day or two.

Commented Issue: Multiple calls to Select causes exception [6864]

theblacklabrador — Thu, 11 Mar 2010 14:31:14 GMT

Hello,

Is there any progress on this? It might seem obscure, but it's actually a critical bug for my project!

Any updates welcome!

Thanks

Commented Issue: Multiple calls to Select causes exception [6864]

mehfuzh — Wed, 06 Jan 2010 18:40:52 GMT

Good catch, will fix it. Actually creating a new version. So wait till end of this week/early next week.