D
Dylan Parry
Hi,
I’ve been tearing my hair out all afternoon on this one, and I’m
probably missing something really simple, but figured I’d ask some
fresher eyes!
I’ve got an MVC application, and one of the pages is supposed to list
some albums that are detailed in a database. I’ve been getting the same
error all day, so I changed the code slightly so that it would just take
the first album in the database and return its title to the browser.
The code for the action method etc is:
--- start ---
private IAlbumsRepository albumsRepository;
public AlbumsController(IAlbumsRepository albumsRepository)
{
this.artistsRepository = artistsRepository;
this.albumsRepository = albumsRepository;
}
public ActionResult Details(string name, string title)
{
return Content(albumsRepository.Albums.First().Title);
}
--- end ---
I’ve used some IoC magic to supply the correct implementation of
“IAlbumsRepository”, which is set up as:
--- start ---
public class SqlAlbumsRepository : IAlbumsRepository
{
private Table<Album> albumsTable;
public SqlAlbumsRepository(string connectionString)
{
albumsTable = (new DataContext(connectionString)).GetTable<Album>();
}
public IQueryable<Album> Albums
{
get { return albumsTable; }
}
}
--- end ---
More IoC stuff in the above supplies the correct “connectionString”. In
case it’s of any help, it’s Castle.Windsor that I’ve used for the IoC stuff.
The “Album” class is a simple class dotted with some attribute tags to
map the various properties to column in the database.
I based the code for all the above on another set of action methods,
repositories and classes that I wrote for “artists”, and those ones work
exactly as expected.
When I run the new stuff however, I get the following error:
---
Server Error in '/' Application.
Length cannot be less than zero.
Parameter name: length
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.
Exception Details: System.ArgumentOutOfRangeException: Length cannot be
less than zero.
Parameter name: length
Source Error:
Line 36: return Content(albumsRepository.Albums.First().Title);
Line 37: }
Line 38:
Source File: D:\Documents\Visual Studio
2008\Projects\ElectricFreedom\WebUI\Controllers\AlbumsController.cs
Line: 36
Stack Trace:
[ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length]
System.String.InternalSubStringWithChecks(Int32 startIndex, Int32
length, Boolean fAlwaysCopy) +7495287
System.Data.Linq.SqlClient.ProviderBase.Parse(String stype) +275
System.Data.Linq.SqlClient.SqlFactory.Default(MetaDataMember member) +52
System.Data.Linq.SqlClient.Translator.BuildProjectionInternal(SqlExpression
item, MetaType rowType, IEnumerable`1 members, Boolean allowDeferred,
SqlLink link, Expression source) +835
System.Data.Linq.SqlClient.Translator.BuildProjection(SqlExpression
item, MetaType rowType, Boolean allowDeferred, SqlLink link, Expression
source) +108
System.Data.Linq.SqlClient.Translator.BuildDefaultQuery(MetaType
rowType, Boolean allowDeferred, SqlLink link, Expression source) +154
System.Data.Linq.SqlClient.QueryConverter.TranslateConstantTable(ITable
table, SqlLink link) +109
System.Data.Linq.SqlClient.QueryConverter.CoerceToSequence(SqlNode
node) +96
System.Data.Linq.SqlClient.QueryConverter.VisitFirst(Expression
sequence, LambdaExpression lambda, Boolean isFirst) +30
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression
mc) +3477
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression
mc) +74
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression
node) +1003
System.Data.Linq.SqlClient.QueryConverter.ConvertOuter(Expression
node) +79
System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query,
SqlNodeAnnotations annotations) +114
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression
query) +132
System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression
expression) +49
System.Linq.Queryable.First(IQueryable`1 source) +269
WebUI.Controllers.AlbumsController.Details(String name, String
title) in D:\Documents\Visual Studio
2008\Projects\ElectricFreedom\WebUI\Controllers\AlbumsController.cs:36
lambda_method(ExecutionScope , ControllerBase , Object[] ) +136
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase
controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext
controllerContext, IDictionary`2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext
controllerContext, ActionDescriptor actionDescriptor, IDictionary`2
parameters) +24
System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +52
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter
filter, ActionExecutingContext preContext, Func`1 continuation) +254
System.Web.Mvc.<>c__DisplayClassf.<InvokeActionMethodWithFilters>b__c() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext
controllerContext, IList`1 filters, ActionDescriptor actionDescriptor,
IDictionary`2 parameters) +192
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext
controllerContext, String actionName) +314
System.Web.Mvc.Controller.ExecuteCore() +105
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +39
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext
requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult
_) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +59
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult
asyncResult) +44
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult
result) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+8679150
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously) +155
--- End ---
At first I tried running SQL Server Profiler to find out what was
getting returned, but I soon realised that it’s not even getting as far
as running a query as nothing shows up at all in the profiler window.
I’ve been puzzling on this one all afternoon and I’m baffled. As I said,
I’m probably missing something really obvious, but at this point my eyes
are too tired to see it!
Any ideas?
I’ve been tearing my hair out all afternoon on this one, and I’m
probably missing something really simple, but figured I’d ask some
fresher eyes!
I’ve got an MVC application, and one of the pages is supposed to list
some albums that are detailed in a database. I’ve been getting the same
error all day, so I changed the code slightly so that it would just take
the first album in the database and return its title to the browser.
The code for the action method etc is:
--- start ---
private IAlbumsRepository albumsRepository;
public AlbumsController(IAlbumsRepository albumsRepository)
{
this.artistsRepository = artistsRepository;
this.albumsRepository = albumsRepository;
}
public ActionResult Details(string name, string title)
{
return Content(albumsRepository.Albums.First().Title);
}
--- end ---
I’ve used some IoC magic to supply the correct implementation of
“IAlbumsRepository”, which is set up as:
--- start ---
public class SqlAlbumsRepository : IAlbumsRepository
{
private Table<Album> albumsTable;
public SqlAlbumsRepository(string connectionString)
{
albumsTable = (new DataContext(connectionString)).GetTable<Album>();
}
public IQueryable<Album> Albums
{
get { return albumsTable; }
}
}
--- end ---
More IoC stuff in the above supplies the correct “connectionString”. In
case it’s of any help, it’s Castle.Windsor that I’ve used for the IoC stuff.
The “Album” class is a simple class dotted with some attribute tags to
map the various properties to column in the database.
I based the code for all the above on another set of action methods,
repositories and classes that I wrote for “artists”, and those ones work
exactly as expected.
When I run the new stuff however, I get the following error:
---
Server Error in '/' Application.
Length cannot be less than zero.
Parameter name: length
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information
about the error and where it originated in the code.
Exception Details: System.ArgumentOutOfRangeException: Length cannot be
less than zero.
Parameter name: length
Source Error:
Line 36: return Content(albumsRepository.Albums.First().Title);
Line 37: }
Line 38:
Source File: D:\Documents\Visual Studio
2008\Projects\ElectricFreedom\WebUI\Controllers\AlbumsController.cs
Line: 36
Stack Trace:
[ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length]
System.String.InternalSubStringWithChecks(Int32 startIndex, Int32
length, Boolean fAlwaysCopy) +7495287
System.Data.Linq.SqlClient.ProviderBase.Parse(String stype) +275
System.Data.Linq.SqlClient.SqlFactory.Default(MetaDataMember member) +52
System.Data.Linq.SqlClient.Translator.BuildProjectionInternal(SqlExpression
item, MetaType rowType, IEnumerable`1 members, Boolean allowDeferred,
SqlLink link, Expression source) +835
System.Data.Linq.SqlClient.Translator.BuildProjection(SqlExpression
item, MetaType rowType, Boolean allowDeferred, SqlLink link, Expression
source) +108
System.Data.Linq.SqlClient.Translator.BuildDefaultQuery(MetaType
rowType, Boolean allowDeferred, SqlLink link, Expression source) +154
System.Data.Linq.SqlClient.QueryConverter.TranslateConstantTable(ITable
table, SqlLink link) +109
System.Data.Linq.SqlClient.QueryConverter.CoerceToSequence(SqlNode
node) +96
System.Data.Linq.SqlClient.QueryConverter.VisitFirst(Expression
sequence, LambdaExpression lambda, Boolean isFirst) +30
System.Data.Linq.SqlClient.QueryConverter.VisitSequenceOperatorCall(MethodCallExpression
mc) +3477
System.Data.Linq.SqlClient.QueryConverter.VisitMethodCall(MethodCallExpression
mc) +74
System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression
node) +1003
System.Data.Linq.SqlClient.QueryConverter.ConvertOuter(Expression
node) +79
System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query,
SqlNodeAnnotations annotations) +114
System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression
query) +132
System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression
expression) +49
System.Linq.Queryable.First(IQueryable`1 source) +269
WebUI.Controllers.AlbumsController.Details(String name, String
title) in D:\Documents\Visual Studio
2008\Projects\ElectricFreedom\WebUI\Controllers\AlbumsController.cs:36
lambda_method(ExecutionScope , ControllerBase , Object[] ) +136
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase
controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext
controllerContext, IDictionary`2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext
controllerContext, ActionDescriptor actionDescriptor, IDictionary`2
parameters) +24
System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +52
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter
filter, ActionExecutingContext preContext, Func`1 continuation) +254
System.Web.Mvc.<>c__DisplayClassf.<InvokeActionMethodWithFilters>b__c() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext
controllerContext, IList`1 filters, ActionDescriptor actionDescriptor,
IDictionary`2 parameters) +192
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext
controllerContext, String actionName) +314
System.Web.Mvc.Controller.ExecuteCore() +105
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +39
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext
requestContext) +7
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +34
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult
_) +12
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +59
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult
asyncResult) +44
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult
result) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+8679150
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&
completedSynchronously) +155
--- End ---
At first I tried running SQL Server Profiler to find out what was
getting returned, but I soon realised that it’s not even getting as far
as running a query as nothing shows up at all in the profiler window.
I’ve been puzzling on this one all afternoon and I’m baffled. As I said,
I’m probably missing something really obvious, but at this point my eyes
are too tired to see it!
Any ideas?
