I'm migrating a solution from asp net to asp net core. When I tested this method
[HttpPut, Route("SearchPrices")]
public dynamic SearchPrices(dynamic data)
{
var list = from ma in db.Materials
select new
{
ma.MaterialID,
ma.MaterialTypeID,
ma.StatusID,
ma.Horsepower,
ma.MaterialPrice
};
list = list.OrderBy(s => s.MaterialID);
string filterString = data.filterString;
if (!string.IsNullOrEmpty(filterString))
{
list = list.Where(ma => new[] {
ma.MaterialID,
ma.MaterialPrice.ToString(),
ma.MaterialTypeID
}.Any(c => c.Contains(filterString)));
}
dynamic sort = data.sort;
string column = sort.column;
if (!string.IsNullOrEmpty(column))
{
bool reverse = sort.reverse;
list = list.OrderByColumn(column, reverse);
}
return FilterByColumn(list, data);
}
I receive a parameter with something like
ValueKind = Object : "{"filterString":"","options":[],"skipNumber":0,"takeNumber":50,"sort":{"column":"","reverse":false}}"
In which I cant make it work like it used to before, it throws a error when it tries to resolve "Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: ''System.Text.Json.JsonElement' does not contain a definition for 'filterString''".
I've already tried some solutions to deserialize, but they didn't work.
Related
public ActionResult Rajasthan()
{
//List<PackageGallery> all = new List<PackageGallery>();
using (travelAndTourismEntities objentity = new travelAndTourismEntities())
{
List<PackageGallery> all = (from p in objentity.PackageGalleries where p.ParentCategory == "Rajasthan" orderby p.Imageid select p).ToList();
// all = objentity.PackageGalleries.ToList();
return View(all);
}
}
I am writing this query but this is specific to rajasthan only how to make it generalize
You can create a parameter to your action method where you accept the state name you want to use in your filter.
public ActionResult PackageGalleries(string id)
{
var all = new List<PackageGallery>();
using (var db = new travelAndTourismEntities())
{
all = db.PackageGalleries
.Where(s=>s.ParentCategory==id)
.OrderBy(x=>x.ImageId).ToList();
}
return View(all);
}
And you can call it like yourSiteName/yourControllerName/PackageGalleries/rajasthan or yourSiteName/yourControllerName/PackageGalleries/kerala
The last part of the url will be mapped to the id parameter of the action method.
Consider this breze query:
return EntityQuery.from('myAPI')
.noTracking(true)
.using(manager).execute()
.then(querySucceeded)
.fail(queryFailed);
My API is defined like this:
[HttpGet]
public object myAPI()
{
// var userId = get the users id from auth ticket
var userPref = _contextProvider.Context.UserPreferences.Where(u => u.userId == userId);
var userOptions = _contextProvider.Context.UserOptions.Where(u => u.userId == userId);
return new
{
userPref,
userOptions
};
}
I know I can get access to the raw data, which is great. But in addition to this, the entities are created in the entity manager, which I would prefer they not be. This works fine for apis that return IQueryable. Is there a different syntax for noTracking for web apis that returns multiple result sets?
thanks
I can't reproduce the error you describe. I have a similar DocCode test that passes which references Breeze v1.5.3.
Here is the pertinent NorthwindController method:
[HttpGet]
public object Lookups()
{
var regions = _repository.Regions;
var territories = _repository.Territories;
var categories = _repository.Categories;
var lookups = new { regions, territories, categories };
return lookups;
}
And here's the passing QUnit test:
asyncTest('object query (e.g., lookups) w/ "no tracking" does not add to cache', function () {
expect(2);
var em = newNorthwindEm();
EntityQuery.from('Lookups')
.noTracking(true)
.using(em).execute()
.then(success).fail(handleFail).fin(start);
function success(data) {
var lookups = data.results[0];
var hasLookups = lookups &&
lookups.categories && lookups.regions && lookups.territories;
ok(hasLookups, 'Expected a lookups object w/ categories, regions and territories');
var cached = em.getEntities();
var len = cached.length;
equal(0, len, 'Expected ZERO cached entities of any kind and got ' + len);
}
});
If I comment out the noTracking(true) clause, the test fails and tells me that there are 65 entities in cache ... as predicted.
What am I missing?
I am working on a multilingual ASP.NET MVC application (MVC4).
I want to make my resource file strings to be editable at runtime without recompiling the application and without app pool recycling And it doesn't look possible with .resx file, so I migrate to store string resources in Database.
I have to Get Each Label/String Resource From Database, so there will be more hits to database for each request. How to fix that?
I have googled around and someone suggests to load the resource in a dictionary and store it as application variable, at login/Sign In page and use that dictionary as resource instead of database hit.
I am confused, what will be effective approach.Can someone guide me in right direction to avoid more database hits?
Any help/suggestions will be highly appreciated.
Thanks
I ran into the same concerns using .resx files for localization. They just did not work well when the persons doing the translation were not programmers. Now, we have a translation page in our admin area. Works great.
One area which we still don't have a good solution for are the data annotations, which still use the .resx files. I have trimmed the source below to remove any references to our actual database structures or tables.
There is a fallback to using the underlying .resx file, if an entry does not exist in the database. If there is not an entry in the .resx file, I split the word whenever a capitol letter is found ( CamelSpace is a string extension method ).
Lastly, depending on your implementation, you may need to remove the context caching, especially if you are caching out of process.
A few examples of usage:
#LanguageDb.Translate("Enter your first name below","FirstNamePrompt")
#LanguageDb.Me.FirstName
#String
.Format(LanguageDb
.Translate(#"You can be insured for
{0} down and {1} payments of {2}"),
Model.Down,Model.NumPayments,
Model.InstallmentAmount)
public class LanguageDb : DynamicObject
{
public static dynamic Me = new LanguageDb();
private LanguageDb() { }
public static string Translate(string englishPhrase, string resourceCode = null)
{
return GetTranslation(englishPhrase, resourceCode) ?? englishPhrase;
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
result = GetTranslation(binder.Name);
return true;
}
private static string GetTranslation(string resourceName, string resourceCode = null)
{
resourceCode = resourceCode ?? resourceName;
if (resourceCode.Contains(" ") || resourceCode.Length > 50)
{
resourceCode = resourceName.GetHashCode().ToString(CultureInfo.InvariantCulture);
}
var lang = (string)HttpContext.Current.Request.RequestContext.RouteData.Values["lang"] ?? "en";
// cache entries for an hour
var result = Get(subagent + "_" + lang + "_" + resourceCode, 3600, () =>
{
// cache a datacontext object for 30 seconds.
var context = Get("_context", 30, () => new YourDataContext()) as YourDataContext;
var translation = context.Translations.FirstOrDefault(row => row.lang == lang && row.Code == resourceCode);
if (translation == null)
{
translation = new Lookup {
Code = resourceCode,
lang = lang,
Value = Language.ResourceManager.GetString(resourceName, Language.Culture)
?? resourceName.CamelSpace()
};
context.Translations.Add(translation);
context.SaveChanges();
}
return translation.Value;
});
return result;
}
public override bool TrySetMember(SetMemberBinder binder, object value)
{
// ignore this
return true;
}
public static T Get<T>(string cacheId, int secondsToCache, Func<T> getItemCallback) where T : class
{
T item = HttpRuntime.Cache.Get(cacheId) as T;
if (item == null)
{
item = getItemCallback();
if (secondsToCache > 0)
{
HttpRuntime.Cache.Insert(
cacheId, item, null, Cache.NoAbsoluteExpiration,
new TimeSpan(0, 0, secondsToCache), CacheItemPriority.Normal, null);
}
else
{
HttpRuntime.Cache.Insert(cacheId, item);
}
}
return item;
}
}
How do I create an index programmatically in RavenDB?
I tried to follow this example.
This is my index creator:
public class MyIndex : Raven.Client.Indexes.AbstractIndexCreationTask<MyEntity>
{
public MyIndex()
{
Map = col => col.Select(c => new
{
code = c.Code,
len = c.Code.Length,
sub = c.Code.Substring(0, 1)
});
}
}
And here is the caller:
var store = new Raven.Client.Document.DocumentStore
{
Url = "http://localhost:8080"
};
store.Initialize();
try
{
using (var session = store.OpenSession("MyDB"))
{
Raven.Client.Indexes.IndexCreation.CreateIndexes(
typeof(MyIndex).Assembly, store);
}
}
finally
{
store.Dispose();
}
The index was created but not in MyDB but in system database.
How to create the index in MyDB? Is the way I create index correct?
Try this:
specify the database name in your store object
var store = new Raven.Client.Document.DocumentStore
{
Url = "http://localhost:8080",
DefaultDatabase = "MyDB"
};
As MED pointed out, you can provide a default database when attaching to the document store. When doing so, you no longer pass the database name to the OpenSession method. This is the easiest way, and if you're working with a single database then it is the best answer (and should be given the credit as the answer to this question).
But if you need to work with multiple databases, and thus can't use that technique, then you can use this helper method.
public static void CreateIndexes(Assembly assembly, IDocumentStore store,
string databaseName)
{
var catalog = new AssemblyCatalog(assembly);
var provider = new CompositionContainer(catalog);
var commands = store.DatabaseCommands.ForDatabase(databaseName);
IndexCreation.CreateIndexes(provider, commands, store.Conventions);
}
Call it the same way you would call the other method, but now you can pass the database name as a parameter.
I modified the "Read" operation on my Windows Azure Mobile Services Preview table (named "Item") as follows:
Javascript:
function read(query, user, request)
{
var howRead;
if(howRead == "unique")
{
var sqlUnique = "SELECT DISTINCT ? FROM Item WHERE qProjectCode = ?";
mssql.query(sqlUnique)
request.execute();
}
else if (howRead == "column")
{
var sqlColumn = "SELECT ? FROM Item WHERE qProjectCode = ?";
mssql.query(sqlColumn)
request.execute();
}
else if (howRead == "all")
{
var sqlAll = "SELECT * FROM Item WHERE qProjectCode = ?";
mssql.query(sqlAll)
request.execute();
}
}
This simply species when I want a unique list of a single column's values returned, all items in a single column, or all columns, respectively, all while limiting the read to those records with a given project code.
Right now, this works in C#, but scans the entire table (with other project codes) and always returns all columns. This is inherently inefficient.
c#
var client = new MobileServiceClient("[https path", "[key]");
var table = client.GetTable<Item>();
var query1 = table.Where(w => w.QProjectCode == qgv.projCode && w.QRecord == (int)lbRecord.Items[uStartRecordIndex]);
var query1Enum = await query1.ToEnumerableAsync();
foreach (var i in query1Enum)
{
// process data
}
How do I alter the c# code to deal with the Javascript code? Feel free to critique the overall approach, since I am not a great programmer and can always use advice!
Thanks
A few things:
In your server code, the mssql calls are not doing anything (useful). If you want to get their results, you need to pass a callback (the call is asynchronous) to it.
Most of your scenarios can be accomplished at the client side. The only for which you'll need server code is the one with the DISTINCT modifier.
For that scenario, you'll need to pass a custom parameter to the server script. You can use the WithParameters method in the MobileServiceTableQuery<T> object to define parameters to pass to the service.
Assuming this data class:
public class Item
{
public int Id { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string Other { get; set; }
public string ProjectCode { get; set; }
}
The code below can be used to accomplish the scenarios 2 and 3 at the client side only (no script needed at the server side). The other one will need some script, which I'll cover later.
Task<IEnumerable<string>> ReadingByColumn(IMobileServiceTable<Item> table, string projectCode)
{
return table
.Where(i => i.ProjectCode == projectCode)
.Select(i => i.Name)
.ToEnumerableAsync();
}
Task<IEnumerable<Item>> ReadingAll(IMobileServiceTable<Item> table, string projectCode)
{
return table.Where(i => i.ProjectCode == projectCode).ToEnumerableAsync();
}
Task<IEnumerable<string>> ReadingByColumnUnique(IMobileServiceTable<Item> table, string projectCode)
{
var dict = new Dictionary<string, string>
{
{ "howRead", "unique" },
{ "projectCode", projectCode },
{ "column", "Name" },
};
return table
.Select(i => i.Name)
.WithParameters(dict)
.ToEnumerableAsync();
}
Now, to support the last method (which takes the parameters, we'll need to do this on the server script:
function read(query, user, request)
{
var howRead = request.parameters.howRead;
if (howRead) {
if (howRead === 'unique') {
var column = request.parameters.column; // WARNING: CHECK FOR SQL INJECTION HERE!!! DO NOT USE THIS IN PRODUCTION!!!
var sqlUnique = 'SELECT DISTINCT ' + column + ' FROM Item WHERE ProjectCode = ?';
mssql.query(sqlUnique, [request.parameters.projectCode], {
success: function(distinctColumns) {
var results = distinctColumns.map(function(item) {
var result = [];
result[column] = item; // mapping to the object shape
return result;
});
request.respond(statusCodes.OK, results);
}
});
} else {
request.respond(statusCodes.BAD_REQUEST, {error: 'Script does not support option ' + howRead});
}
} else {
// no server-side action needed
request.execute();
}
}