I have passed DIctionary to my view using a viewbag item.
In my view I am them converting back to Dictionary:
var date = veiwbag.Dictionary as Dictionary;
My dcitionary is set up as:
Key = string of date ("MMM yyyy") eg - SEP 2012
value = int - which is a count of entries in database where the date matches the key.
I am abel to output these Key value pairs. I need to know ho wwhen suer sleects an entry I can return the string Key to an aciton method to retrieve all dates for that string.
I'm new to MVC3 so am a bit lost.
My initial thinking was along the lines of:
(this syntax may be slightly wring as doing from memory)
#date.key (#date.value)
my controller has action:
public ActionResult Previous(string date)
{
..work on data
return View(..my results);
}
the code in the ActionResult is fine . The link takes me to my ActionResult but the string is null. How do I pass the
date.key
into the ActionResult as a string variable? Am I going about this all the wring way?
You could use a HTML helper to generate a proper link to this controller action:
#Html.ActionLink(
string.Format("{0} ({1})", date.key, date.value),
"Previous",
new { date = date.Key }
)
And if you need to specify the controller name as well you could use the following overload:
#Html.ActionLink(
string.Format("{0} ({1})", date.key, date.value),
"Previous",
"Posts",
new { date = date.Key },
null
)
Assuming default routes have been setup this will generate the following markup:
SEP 2012 (9)
and when the Previous controller action is invoked it will successfully be passed the date parameter of SEP 2012.
If you use default routes, then use:
public ActionResult Previous(string id)
or your link must look like:
/Posts/Previous?date=sometext
but better solution is use #Html.ActionLink:
#Html.ActionLink(String.Format("{0} ({1})", date.key, date.value), "Previous", "Posts", new { data = date.Key }, null)
Related
I am facing a problem in searching a exact record by LINQ query method in ASP.NET Web API my controller. This is my code:
[HttpGet]
[Route("api/tblProducts/AllProductbySearch/{SearchText}")]
[ResponseType(typeof(IEnumerable<tblProduct>))]
public IHttpActionResult AllProductbySearch(string SearchText)
{
IEnumerable<tblProduct> tblProduct = db.tblProducts.Where(x=>x.PrdKeyword.Contains(SearchText)).AsEnumerable();
if (tblProduct == null)
{
return NotFound();
}
return Ok(tblProduct);
}
In this I am searching the record with value have keyword column and getting the result but problem is that it is not giving exact result for example if in database two record have keyword column value like shirt and another have Tshirt
Then if I pass shirt in SearchText or pass tshirt in SearchText it is giving both record while I want one record which exact match with SearchText. Please help me
My updated action method code is:
[HttpGet]
[Route("api/tblProducts/AllProductbySearch/{SearchText}")]
[ResponseType(typeof(IEnumerable<tblProduct>))]
public IHttpActionResult AllProductbySearch(string SearchText)
{
IEnumerable<tblProduct> tblProduct = db.tblProducts.Where(x => CheckWord(x.PrdKeyword, SearchText)).AsEnumerable();
if (tblProduct == null)
{
return NotFound();
}
return Ok(tblProduct);
}
private bool CheckWord(string source, string searchWord)
{
var punctuation = source.Where(Char.IsPunctuation).Distinct().ToArray();
var words = source.Split().Select(x => x.Trim(punctuation));
return words.Contains(searchWord, StringComparer.OrdinalIgnoreCase);
}
But is throwing the same error - http 500
EDITED 2
Added ToList() - db.tblProducts.ToList().... In this case we retrieve all data from Data Base and filter them in memory. If we don't retrieve all data before filtering .Net tries to create request to SQL with filtration and can't because there are .Net methods as CheckWord().
I think we can get required data without retrieving all table into memory, but don't know how. As variant we should write specific Stored Procedure and use it. Get all into memory is a simplest way (but not faster)
Please, look at this post Get only Whole Words from a .Contains() statement
Actually, for your case solution can be:
IEnumerable<tblProduct> tblProduct = db.tblProducts.ToList()
.Where(x => Regex.Match(x.PrdKeyword, $#"\b{SearchText}\b", RegexOptions.IgnoreCase).Success)
.AsEnumerable();
Option 2. Without regexp:
public static bool CheckWord(string source, string searchWord)
{
if (source == null)
return false;
var punctuation = source.Where(Char.IsPunctuation).Distinct().ToArray();
var words = source.Split().Select(x => x.Trim(punctuation));
return words.Contains(searchWord, StringComparer.OrdinalIgnoreCase);
}
[HttpGet]
[Route("api/tblProducts/AllProductbySearch/{SearchText}")]
[ResponseType(typeof(IEnumerable<tblProduct>))]
public IHttpActionResult AllProductbySearch(string SearchText)
{
IEnumerable<tblProduct> tblProduct = db.tblProducts.ToList()
.Where(x => CheckWord(x.PrdKeyword, SearchText)).AsEnumerable();
if (tblProduct == null)
{
return NotFound();
}
return Ok(tblProduct);
}
Sorry, I'm from phone now, there can be mistakes here. Will try it in 3-4 hour
You are making a simple mistake. You just need to use .Equals instead of .Contains.
When you use Contains .Net will check if the input string is part of the main string. Whereas Equals will check for exact match.
var mainStr = “long string with Hello World”;
var inputStr = “Hello”;
var status = mainStr.Contains(inputStr);
// Value of status is `true`
status = mainStr.Equals(inputStr);
// Value of status is `false`
So your code should look like this:
IEnumerable<tblProduct> tblProduct = db.tblProducts.Where(x=>x.PrdKeyword.Equals(SearchText)).AsEnumerable();
.Equals can also help you find exact match with or without having case-sensitive check in force. The single-parameterised method does a Case-Sensitive check whereas the other overridden methods of .Equals gives you an opportunity to ignore it.
Hope this helps!
I'm trying to see if I need to write a custom IHttpRouteConstraint or if I can wrestle with the built-in ones to get what I want. I can't see to find any good documentation on this anywhere.
Basically, here's my action:
[Route("var/{varId:int:min(1)}/slot/{*slot:datetime}")]
public async Task<HttpResponseMessage> Put(int varId, DateTime slot)
{
...
}
What I want is to be able to call it like this:
PUT /api/data/var/1/slot/2012/01/01/131516 and have the framework bind 19 to var id and a DateTime with a value of "Jan 1st, 2012, 1:15:16pm" as the "slot" value.
Following the guide from here: http://www.asp.net/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing I am able to get it to work by passing in just the date segments, i.e. PUT /api/data/var/1/slot/2012/01/01 or PUT /api/data/var/1/slot/2012-01-01, but that only gives me a data value, no time components.
Something tells me that trying to pass in time in any sane way through URI segments is a bad idea, but I'm not sure why it'd be a bad idea, besides the ambiguity regarding local vs UTC times.
I've also tried constraining the datetime constraint with a regex, e.g. {slot:datetime:regex(\\d{4}/\\d{2}/\\d{2})/\\d{4})} to try to get it to parse something like 2013/01/01/151617 as a DateTime, but to no avail.
I'm pretty sure I can get this to work with a custom IHttpRouteConstraint, I just don't want to do something that might be built in.
Thanks!
an option is to pass the DateTime as query string parameters (see [FromUri]
e.g.
[Route("api/Customer/{customerId}/Calls/")]
public List<CallDto> GetCalls(int customerId, [FromUri]DateTime start, [FromUri]DateTime end)
this will have a signature of
GET api/Customer/{customerId}/Calls?start={start}&end={end}
Create the query string dates with
startDate.ToString("s", CultureInfo.InvariantCulture);
query string will look like
api/Customer/81/Calls?start=2014-07-25T00:00:00&end=2014-07-26T00:00:00
Web API datetime constraint doesn't do anything special regarding parsing datetime as you can notice below(source code here).
If your request url is like var/1/slot/2012-01-01 1:45:30 PM or var/1/slot/2012/01/01 1:45:30 PM, it seems to work fine...but I guess if you need full flexibility then creating a custom constraint is the best option...
public bool Match(HttpRequestMessage request, IHttpRoute route, string parameterName, IDictionary<string, object> values, HttpRouteDirection routeDirection)
{
if (parameterName == null)
{
throw Error.ArgumentNull("parameterName");
}
if (values == null)
{
throw Error.ArgumentNull("values");
}
object value;
if (values.TryGetValue(parameterName, out value) && value != null)
{
if (value is DateTime)
{
return true;
}
DateTime result;
string valueString = Convert.ToString(value, CultureInfo.InvariantCulture);
return DateTime.TryParse(valueString, CultureInfo.InvariantCulture, DateTimeStyles.None, out result);
}
return false;
}
Using Orchard CMS, I am dealing with a record and a part proxy, but cannot figure out how to save it into the DB. In fact, I confess I don't even know how to get the items I'm trying to save into this paradigm. I was originally using enum's for choices:
MyEmum.cs:
public enum Choices { Choice1, Choice2, Choice3, Choice4 }
MyRecord.cs:
public virtual string MyProperty { get; set; }
MyPart.cs:
public IEnumerable<string> MyProperty
{
get
{
if (String.IsNullOrWhiteSpace(Record.MyProperty)) return new string[] { };
return Record
.MyProperty
.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries)
.Select(r => r.Trim())
.Where(r => !String.IsNullOrEmpty(r));
}
set { Record.MyProperty = value == null ? null : String.Join(",", value); }
}
Now, in my service class, I tried something like:
public MyPart Create(MyPartRecord record)
{
MyPart part = Services.ContentManager.Create<MyPart>("My");
...
part.MyProperty = record.MyProperty; //getting error here
...
return part;
}
However, I am getting the following error: Cannot implicitly convert 'string' to System.Collections.Generic.IEnumerable<string>'
Essentially, I am trying to save choices from a checkboxlist (one or more selections) as a comma-separated list in the DB.
And this doesn't even get me over the problem of how do I use the enum. Any thoughts?
For some background:
I understand that the appropriate way to handle this relationship would be to create a separate table and use IList<MyEnum>. However, this is a simple list that I do not intend to manipulate with edits (in fact, no driver is used in this scenario as I handle this on the front-end with a controller and routes). I am just capturing data and redisplaying it in the Admin view for statistical/historical purposes. I may even consider getting rid of the Part (considering the following post: Bertrand's Blog Post.
It should be:
part.MyProperty = new[] {"foo", "bar"};
for example. The part's setter will store the value on the record's property as a comma-separated string, which will get persisted into the DB.
If you want to use enum values, you should use the Parse and ToString APIs that .NET provide on Enum.
I am using JQGrid with the Trirand.Web.Mvc class, and trying to figure out how to do custom paging.
I have seen the paging demos here
The problem with these demos is that they bind directly to a linq context object and lets MVC take care of the paging.
// This method is called when the grid requests data. You can choose any method to call
// by setting the JQGrid.DataUrl property
public JsonResult PerformanceLinq_DataRequested()
{
// Get both the grid Model and the data Model
// The data model in our case is an autogenerated linq2sql database based on Northwind.
var gridModel = new OrdersJqGridModel();
var northWindModel = new NorthwindDataContext();
// return the result of the DataBind method, passing the datasource as a parameter
// jqGrid for ASP.NET MVC automatically takes care of paging, sorting, filtering/searching, etc
return gridModel.OrdersGrid.DataBind(northWindModel.OrdersLarges);
}
The data set I want to bind to is quite complex and I am returning it from a stored procedure, which does the paging for me.
So all I have to give JQGrid is the correct size of rows for a specific page of the entire resultset. I can also return the total row count.
So I have my results in a List myListOfObjects.
I can pass this into the DataBind using myListOfObjects.AsQueryable()
The problem is, JQGrid thinks there is only {page size} rows, so does not display any of the paging options.
Is it possible to pass in the total row count?
Other grids, like Teleriks MVC grid allows you to pass in the Total row count, and it displays the paging correctly
Ok, so I've managed to solve this myself. There may be other ways to do it, if so I'd love to hear them!
The JQGrid.DataBind produces an JsonResult object, whose Data value is set to Trirands own object Trirand.Web.Mvc.JsonResponse
It's an internal class to their Trirand.Web.Mvc, so i had to copy its structure which I could see using Visual Studio debugging.
It has:
page - the current page number
records - the total record count
rows - of type Trirand.Web.Mvc.JsonRow (which I need to replicate too)
total - the total number of pages needed
JsonRow looks like:
cell - a string array of your columns
id - your row ID
So my code looked like this:
var jsonList = new List<JSONRow>();
myData.ForEach(x => jsonList.Add(new JSONRow(x)));
var jsonResult = Json (new
{
page = page,
rows = jsonList.ToArray(),
records = totalRows,
total = Math.Round((double)totalRows / rows, MidpointRounding.AwayFromZero)
}, JsonRequestBehavior.AllowGet);
return jsonResult;
My JsonRow looks like this:
public class JSONRow
{
public string[] cell { get; set; }
public string id { get; set; }
public JSONRow(MyObjectType myObject)
{
id = myObject.id;
cell = new string[3];
cell[0] = myObject.Col1;
cell[1] = myObject.Col2?? "";
cell[2] = myObject.Col3?? "";
}
}
I have a linq query to a XML dataset, which when executed is generating a NullReferenceException.
XDocument dataDoc = XDocument.Load(new StringReader(e.Result));
var Genres = from genre in dataDoc.Descendants("genres")
where (!genre.Element("ID").IsEmpty)
select (string)genre.Element("id").Value + ',' + (string)genre.Attribute("name").Value + ',' + (string)genre.Attribute("url").Value;
foreach (string myGenre in Genres)
{
}
When executed, the Linq query works fine, but when the code attempts to iterate through the foreach loop, the NullReferenceException occurs.
Now, i think that the issue has to do with the XML data I am reading, which looks like the following:
<genres>
<translated>true</translated>
<genre name="1">
<id>28</id>
<url>http://url1</url>
</genre>
<genre name="2">
<id>12</id>
<url>http://url2</url>
</genre>
</genres>
Is the first child node, which is different in structure, causing the issue?
My class behind this shouldn't be an issue, but is the following (just in case):
public class Genre
{
public string ID { get; set; }
public string Name { get; set; }
public string URL { get; set; }
}
genre.Attribute("url") returns null, since there is no url attribute.
You need to call Element, not Attribute.
EDIT: Calling dataDoc.Descendants("genres") returns the single <genres> element, which is not what you want.
You need to call Descendants("genre") (singular) to get the individual <genre ...> elements.
You could also call dataDoc.Descendants("genres").Elements to get the elements inside the <genres> element.
SLaks has pointed out the mistake in using Attribute rather than Element, but there's another improvement you can make in your code. Currently you're using the Value property and then redundantly casting to string. If you just cast an XAttribute or XElement to string, then if the original reference is null, the result will be null as well, rather than an exception being thrown. There's no point in using Value and casting.