I'm using TDirectory::GetFiles() to get a list of files (obviously).
The result is stored in a TStringDynArray and I want to transfer it to a TStringList for the sole purpose to use the IndexOf() member to see if a string is present in the list or not.
Any solution that will let me know if a certain string is present in the list of files returned from TDirectory::GetFiles() will do fine. Although, it would be interesting to know how to convert the TStringDynArray.
TStringDynArray DynFiles = TDirectory::GetFiles("Foo path");
System::Classes::TStringList *Files = new System::Classes::TStringList;
Files->Assing(DynFiles) // I know this is wrong, but it illustrates what I want to do.
if(Files->IndexOf("Bar") { // <---- This is my goal, to find "Bar" in the list of files.
}
TStringList and TStringDynArray do not know anything about each other, so you will have to copy the strings manually:
TStringDynArray DynFiles = TDirectory::GetFiles("Foo path");
System::Classes::TStringList *Files = new System::Classes::TStringList;
for (int I = DynFiles.Low; I <= DynFiles.High; ++I)
Files->Add(DynFiles[I]);
if (Files->IndexOf("Bar")
{
//...
}
delete Files;
Since you have to manually loop through the array anyway, you can get rid of the TStringList:
TStringDynArray DynFiles = TDirectory::GetFiles("Foo path");
for (int I = DynFiles.Low; I <= DynFiles.High; ++I)
{
if (DynFiles[I] == "Bar")
{
//...
break;
}
}
But, if you are only interested in checking for the existence of a specific file, look at TFile::Exists() instead, or even Sysutils::FileExists().
if (TFile::Exists("Foo path\\Bar"))
{
//...
}
if (FileExists("Foo path\\Bar"))
{
//...
}
* personally, I hate that the IOUtils unit uses dynamic arrays for lists. They are slow, inefficient, and do not integrate well with the rest of the RTL. But that is just my opinion.
TStrings knows TStringDynArray good enough to provide a member AddStrings:
Files->AddStrings(TDirectory::GetFiles("Foo path"));
will do the job.
I'm very new to breeze/knockout, but I'm 99% of the way to doing what I need to do. I'm using the Hot Towel template, and I'm successfully retrieving a list of items via breeze. The entity (ITBAL) is a database first Entity Framework entity. When I look at the JSON coming back in Fiddler, I see the correct data. The problem is that all of the properties of data.results are dependentobservables, and not the raw values themselves.
We have a custom grid control that is trying to display the data.results array. Because it is not expecting observables, it is simply displaying "function dependentobservable" instead of the value.
I tried to unwrap the object, but keep getting the circular reference error. I don't know why that is, since ITBAL isn't associated with anything.
The data as Fiddler reports it:
[{"$id":"1","$type":"WebUIHtml5HotTowel.Models.ITBAL, WebUIHtml5HotTowel","IBITNO":"A100 ","IBWHID":"1 ","IBITCL":"50","IBITSC":"3 ","IBSUSP":" ","IBVNNO":"100 ","IBPRLC":" ","IBSCLC":" ","IBCCCD":"P","IBPICD":" ","IBSAFL":"Y","IBSTCS":399.99000,"IBUSCS":0.00000,"IBAVCS":414.95214,"IBLCST":7.00000,"IBLCCC":20.0,"IBLCDT":110923.0,"IBLSCC":20.0,"IBLSDT":130111.0,"IBLXCC":19.0,"IBLXDT":990102.0,"IBMXO1":2100.000,"IBMXO2":0.000,"IBMXO3":0.000,"IBMNO1":5.000,"IBMNO2":0.000,"IBMNO3":0.000,"IBFOQ1":0.000,"IBFOQ2":0.000,"IBFOQ3":0.000,"IBOHQ1":327.000,"IBOHQ2":0.000,"IBOHQ3":0.000,"IBAQT1":1576.000,"IBAQT2":0.000,"IBAQT3":0.000,"IBBOQ1":50.000,"IBBOQ2":0.000,"IBBOQ3":0.000,"IBPOQ1":448.000,"IBPOQ2":0.000,"IBPOQ3":0.000,"IBIQT1":1446.000,"IBIQT2":0.000,"IBIQT3":0.000,"IBRMD1":10.000,"IBRMD2":0.000,"IBRMD3":0.000,"IBRYD1":10.000,"IBRYD2":0.000,"IBRYD3":0.000,"IBISM1":0.000,"IBISM2":0.000,"IBISM3":0.000,"IBISY1":0.000,"IBISY2":0.000,"IBISY3":0.000,"IBAMD1":0.000,"IBAMD2":0.000,"IBAMD3":0.000,"IBAYD1":0.000,"IBAYD2":0.000,"IBAYD3":0.000,"IBMMD1":0.000,"IBMMD2":0.000,"IBMMD3":0.000,"IBMYD1":0.000,"IBMYD2":0.000,"IBMYD3":0.000,"IBSMD1":1.0,"IBSMD2":0.0,"IBSMD3":0.0,"IBSYD1":1.0,"IBSYD2":0.0,"IBSYD3":0.0,"IBBLME":335.000,"IBBLYO":2680.000,"IBBLLY":1441.000,"IBNMTY":8.0,"IBNMLY":11.0,"IBQSMD":21.000,"IBQSYD":21.000,"IBQSLY":20.000,"IBISMD":16318.19,"IBISYD":16318.19,"IBISLY":45714.87,"IBCSMD":373.46,"IBCSYD":373.46,"IBCSLY":67.00,"IBDQMD":0.000,"IBDQYD":0.000,"IBDQLY":0.000,"IBDSMD":0.00,"IBDSYD":0.00,"IBDSLY":0.00,"IBDCMD":0.00,"IBDCYD":0.00,"IBDCLY":0.00,"IBNOMD":18.0,"IBNOYD":18.0,"IBNOLY":18.0,"IBPKMD":15.0,"IBPKYD":15.0,"IBPKLY":14.0,"IBINUS":" ","IBIAID":0.0,"IBSAID":0.0,"IBCQT1":1527.000,"IBCQT2":0.000,"IBCQT3":0.000,"IBFCST":"Y","IBDRSH":" ","IBWMIU":"JP","IBFL15":" ","IBUS20":" ","IBLPR1":0.00000,"IBLPR2":0.00000,"IBLPR3":0.00000,"IBLPR4":0.00000,"IBLPR5":0.00000,"IBLPCD":" ","IBABCC":"B","IBPRCL":0.0,"IBQBCL":" ","IBACDC":"Y","IBTDCD":" ","IBDOUM":" ","IBTP01":0.0,"IBTP02":0.0,"IBTP03":0.0,"IBTP04":0.0,"IBLMCC":20.0,"IBLMDT":130513.0,"IBTMPH":"Y","IBCOMC":" ","IBCOMF":0.00000,"IBITCT":" ","IBEOQT":0.000,"IBITCM":0.0,"IBBRVW":" ","IBPTID":" ","IBQTLT":0.0000,"IBCTY1":"AUS","IBCTY2":"AUS","IBTXCD":"1","IBREVS":"Y","IBITXC":" ","IBMNOQ":0.000,"IBSTUS":0.000,"IBUS30":" ","IBPSLN":" ","IBPLIN":"N","IBUPDP":"Y","IBDFII":"2011-08-11T00:00:00.000","IBLHRK":"A","IBPLNC":" "}]
My Controller:
[BreezeController]
public class ItemInquiryController : ApiController
{
readonly EFContextProvider<AplusEntities> _contextProvider = new EFContextProvider<AplusEntities>();
[System.Web.Http.HttpGet]
public string Metadata()
{
return _contextProvider.Metadata();
}
[HttpGet]
public IQueryable<ITBAL> ItemBalances(string itemNumber, string warehouse)
{
return _contextProvider.Context.ITBALs.Where(i => i.IBITNO == itemNumber && i.IBWHID == warehouse)
.OrderBy(i => i.IBWHID)
.ThenBy(i => i.IBITNO);
}
}
The relevant portion from the viewmodel:
var manager = new breeze.EntityManager("api/ItemInquiry");
var store = manager.metadataStore;
var itbalInitializer = function (itbal) {
itbal.CompositeKey = ko.computed(function () {
return itbal.IBITNO() + itbal.IBWHID();
});
};
store.registerEntityTypeCtor("ITBAL", null, itbalInitializer);
var index = "0" + (args.pageNum * args.pageSize);
var query = new breeze.EntityQuery("ItemBalances")
.withParameters({ itemNumber: "A100", warehouse: "1" })
.take(args.pageSize);
if (index > 0) {
query = query.skip(index);
}
manager.executeQuery(query).then(function (data) {
vm.itbals.removeAll();
var itbals = data.results;//[0].Data;
itbals.forEach(function (itbal) {
vm.itbals.push(itbal);
});
vm.totalRecords(1);
itemBalancesGrid.mergeData(vm.itbals(), args.pageNum, parseInt(vm.totalRecords()));
}).fail(function (e) {
logger.log(e, null, loggerSource, true, 'error');
});
I figure I must be missing something fairly simple, but it is escaping me.
UPDATE: I removed the BreezeController attribute from the ApiController, and it works correctly.
Jon, removing the [Breeze] attribute effectively disables breeze for your application so I don't think that is the long term answer to your problem.
If you don't actually want entities for this scenario - you just want data - than a Breeze projection that mentions just the data to display in the grid would seem to be the best choice. Projections return raw data that are not wrapped in KO observables and are not held in the Breeze EntityManager cache.
If you want the data as cached entities and you also want to display them in a grid that doesn't like KO observable properties ... read on.
You can unwrap a KO'd object with ko.toJS. However, the grid is likely to complain about circular references (or throw an "out of memory" exception as some grids do) ... even if the entity has no circular navigation paths. The difficulty stems from the fact that every Breeze entity has an inherent circularity by way of its entityAspect property:
something.entityAspect.entity //'entity' points back to 'something'
Because you are using Knockout for your model library and because you say ITBAL has no navigation properties ("is not related to anything"), I think the following will work for you:
manager.executeQuery(query).then(success) ...
function success(data) {
var unwrapped = ko.toJS(data.results).map(
function(entity) {
delete entity.entityAspect;
return entity;
});
vm.itbals(unwrapped);
vm.totalRecords(1); // huh? What is that "parseInt ..." stuff?
itemBalancesGrid.mergeData(vm.itbals(), args.pageNum, parseInt(vm.totalRecords()));
})
ko.toJS is a Knockout function that recursively unwraps an object or collection of objects, returning copies of values. Then we iterate over the copied object graphs, deleting their entityAspect properties. The array of results is stuffed into the vm.itbals observable and handed along.
You can imagine how to generalize this to remove anything that is giving you trouble.
Extra
What the heck is vm.totalRecords? I sense that this is supposed to be the total number of matching records before paging. You can get that from Breeze by adding .inlineCount() to the breeze query definition. You get the value after the query returns from the data.inlineCount property.
Do you really need vm.itbals()? If all you do here is pass values to the grid, why not do that and cut out the middle man?
The following success callback combines these thoughts
function success(data) {
var unwrapped = ko.toJS(data.results).map(
function(entity) {
delete entity.entityAspect;
return entity;
});
itemBalancesGrid.mergeData(unwrapped, args.pageNum, data.inlineCount);
})
I need to parse an expressiontree to get a sql where clause.
Aren't there any classes in the .NET FX or any third party library which already have this abilities ?
I mean Linq2SQL, EntityFramework , all of them have to do this, so does anyone know, if there is something that can be reused instead of reinventing the wheel?
MyType.Where(Func<TEntity,bool>((entity)=>entity.Id == 5)))
now i need to get the corresponding string representing a where clause:
where abc.Id = "5"
this is just an simple example. it should also work with logical conjunctions.
I know I can create the expressiontree and parse it on my own, but i think there could be something already existing, which I'm missing
You could create an ExpressionVisitor with the sole purpose of finding and processing the where calls. Making this task very easy to handle.
e.g.,
public class WhereCallVisitor : ExpressionVisitor
{
protected override Expression VisitMethodCall(MethodCallExpression node)
{
var method = node.Method;
if (method.Name == "Where" && method.DeclaringType == typeof(Queryable))
{ // we are in a Queryable.Where() call
ProcessWhereCall(node);
}
return base.VisitMethodCall(node);
}
private void ProcessWhereCall(MethodCallExpression whereCall)
{
// extract the predicate expression
var predicateExpr = ((dynamic)whereCall.Arguments[1]).Operand as LambdaExpression;
// do stuff with predicateExpr
}
// p.s., dynamic used here to simplify the extraction
}
Then to use it:
var query = from row in table
where row.Foo == "Bar"
select row.Baz;
var visitor = new WhereCallVisitor();
visitor.Visit(query.Expression);