I've got a bunch of screenshots and some screenshot meta data I'm trying to display in an ASP.NET MVC 3 web application, I'm trying to retrieve the data from my databse but I get this error:
LINQ to Entities does not recognize the method 'System.Drawing.Image
ByteArrayToImage(Byte[])' method, and this method cannot be translated
into a store expression.
Here's my code:
var screenshotData = (from screenshots in db.screenshots
where screenshots.projects_ID == projectID
select new ImageInformation
{
ID = screenshots.id,
Language = screenshots.language,
Screenshot = Utility.ByteArrayToImage(screenshots.screen_shot),
ProjectID = screenshots.projects_ID
});
foreach (ImageInformation info in screenshotData)
{
this.Add(info);
}
ImageInformation is just a simple class that contains the defintion the information stored (ID, Language, Screenshot, ProjectID).
Here's my ByteArrayToImage function:
public static Image ByteArrayToImage(byte[] byteArrayIn)
{
using (MemoryStream ms = new MemoryStream(byteArrayIn))
{
Image returnImage = Image.FromStream(ms);
return returnImage;
}
}
Can anybody tell me why I receive this error when this code runs?
Thanks.
I think it's because, with LINQ-to-Entities, the code is turned into server-side query and it can't do that in this case. I don't think you can mix client-side code like this directly with L2E.
I would suspect you will have to do the conversion from byte->image after you've retrieved the data from the database as a distinct step.
You can't do the function in a LINQ to Entities query... one option:
1) have a byte[] property on the object you are instantiating (ImageInformation) and copy the data in there along with another propery to read the image from this ImageInformation object.
Related
I am wondering how a xstring should be retrieved from ABAP backend using RfcQuery.
final RfcQuery query = new RfcQuery(<myRFC>)...
Byte[] pdf = query.execute(erpEndpoint).get("EX_BLOB").getAs ??
Any ideas?
As of now retrieving XSTRING values from an remote-enabled function module is not supported.
I'll edit this question if there is an update.
i have a wcf which connects to crm (on prem) to retrieve an account record. i can see when the entity is retrieved it does not hold the current record i.e. some field will still hold the old column value. i tried with various merge option with no avail. please see the code below
using (XrmServiceContext cContext = new XrmServiceContext(con))
{
Entity ent = cContext.Retrieve(ConstantKVP.AccountSchema.ENTITY_LOGICAL_NAME, AccountId, new ColumnSet(true));
}
any suggestions?
Is it possible the data is being cached?
cContext.TryAccessCache(cache => cache.Mode = OrganizationServiceCacheMode.Disabled);
I took this approach for a CrmOrganizationServiceContext, so perhaps the same theory applies.
After save use clear changes cContext.ClearChanges();
For retrieves use MergeOption.OverwriteChanges
Or
Create a new XrmServiceContext object by passing a newed up organizationservice:
var uncachedOrganizationService = new OrganizationService("Xrm");
var uncachedXrmServiceContext = new XrmServiceContext(uncachedOrganizationService);
var ent = uncachedXrmServiceContext.Retrieve(ConstantKVP.AccountSchema.ENTITY_LOGICAL_NAME,AccountId,new ColumnSet(true));
I am using breeze and the filter does not work.
var EntityQuery = breeze.EntityQuery;
var manager = configureBreezeManager("xxx");
function configureBreezeManager(param) {
breeze.NamingConvention.camelCase.setAsDefault();
var mgr = new breeze.EntityManager(param);
model.configureMetadataStore(mgr.metadataStore);
return mgr;
}
And my query query
var query = EntityQuery.from('GetStudents').where("Id", "==", "xxx");
return manager.executeQuery(query)
The filter is ignore and all results are returned. my get student returns an IQueryable of all students.
public IQueryable<Students> GetStudents(){
return context.Students;
}
Is there something up there I am doing wrong or should I look elsewhere?
EDIT
I realize that my controller is missing the property [BreezeController]. But when I include that, me metadata path is not found giving me an error (error 500 below) when trying to load it. The matadata loads fine without this property on the controller, but filtering does not work. Is this related?
"Could not load file or assembly 'System.Web.Http.OData, ... or one of its dependencies. The system cannot find the file specified."
Your issue might be that you have specified a 'camelCase' namingConvention, but your query is for 'Id' instead of 'id'. i.e. try:
var query = EntityQuery.from('GetStudents').where("id", "==", "xxx");
return manager.executeQuery(query)
I was missing the [BreezeController] and after adding it, I received the error Could not load file or assembly System.Web.Http.OData, Version=4.0.0.0 and was able to solve it by runing Install-Package Microsoft.AspNet.WebApi.OData in the package manager
I have a servicestack service which when called via the browser (restful) Url ex:http://localhost:1616/myproducts, it works fine.
The service method has RedisCaching enabled. So first time it hits the data repository and caches it for subsequent use.
My problem is when I try calling it from a c# client via Soap12ServiceClient. It returns the below error:
Error in line 1 position 183. Expecting element '<target response>'
from namespace 'http://schemas.datacontract.org/2004/07/<target namespace>'..
Encountered 'Element' with name 'base64Binary',
namespace 'http://schemas.microsoft.com/2003/10/Serialization/'.
Below is my Client code:
var endpointURI = "http://mydevelopmentapi.serverhostingservices.com:1616/";
using (IServiceClient client = new Soap12ServiceClient(endpointURI))
{
var request = new ProductRequest { Param1 = "xy23432"};
client.Send<ProductResponse>(request);
}
It seems that the soapwsdl used is giving the problem, but I appear to have used the defaults as generated by servicestack..
Any help will be much appreciated.
Update
I was able over come this error by changing the cache code at the service end:
Code that returned error at client end:
return RequestContext.ToOptimizedResultUsingCache(this.CacheClient, cacheKey,
() =>
new ProductResponse(){CreateDate = DateTime.UtcNow,
products = new productRepository().Getproducts(request)
});
Code that works now:
var result = this.CacheClient.Get<ProductResponse>(cacheKey);
if (result == null)
{
this.CacheClient.Set<ProductResponse>(cacheKey, productResult);
result = productResult;
}
return result;
But I am still curious to know why the first method (RequestContext.ToOptimizedResultUsingCache) returned error at c# client?
But I am still curious to know why the first method (RequestContext.ToOptimizedResultUsingCache) returned error at c# client?
From what I can tell, the ToOptimizedResultUsingCache is trying to pull a specific format (xml, html, json, etc) out of the cache based on the RequestContext's ResponseContentType (see code here and here). When using the Soap12ServiceClient the ResponseContentType is text/html (not sure if this is correct/intentional within ServiceStack). So what ToOptimizedResultUsingCache is pulling out of the cache is a string of html. The html string is being returned to the Soap12ServiceClient and causing an exception.
By pulling directly out of the cache you are bypassing ToOptimizedResultUsingCache's 'format check' and returning something the Soap12ServiceClient can handle.
** If you are using Redis and creating your key with UrnId.Create method you should see a key like urn:ProductResponse:{yourkey}.html
Thanks for your response paaschpa.
I revisited the code and I was able to fix it. Since your response gave me the direction, I have accepted your answer. Below is my fix.
I moved the return statement from RequestContext to the response DTO.
Code which throws error when used via c# client (code was returning entire requestcontext):
return RequestContext.ToOptimizedResultUsingCache(this.CacheClient, cacheKey,
() =>
new ProductResponse(){CreateDate = DateTime.UtcNow,
products = new productRepository().Getproducts(request)
});
Fixed Code (return moved to response DTO):
RequestContext.ToOptimizedResultUsingCache(this.CacheClient, cacheKey,
() => {
return new ProductResponse(){CreateDate = DateTime.UtcNow,
products = new productRepository().Getproducts(request)
}
});
I'm starting using DevExpress XtraReports for the company project. My problem is the following:
I have a stored procedure that extracts the data, given three paramaters: startDay, endDay and developer ID, and this SP is inside a .dbml file.
Following this example http://www.devexpress.com/Support/Center/p/B223095.aspx, we have the this method:
static void report_DataSourceDemanded(object sender, System.EventArgs e)
{
Reports.WeeklyTimesheet report = (Reports.WeeklyTimesheet)sender;
DataClasses1DataContext context = new DataClasses1DataContext();
System.Data.Linq.ISingleResult<WeeklyTimesheetUserReportResult> res = >context.WeeklyTimesheetUserReport(Convert.ToDateTime("2012/01/16"), >Convert.ToDateTime("2012/01/20"), 52);
var result = from orderDetail in res select orderDetail;
report.DataSource = res.ToList();
}
Which is the only way i've found (that works) to pass parameters to the SP for the report.
What can i do so the report comes with the data i am sucessfully bringing but is not binding into the report? The attached images will illustrate this point better.
I have to point that when i made that report in the images, were originally formatted from a dataset using the wizard (hence why is ordered), but i have no idea how i can format it instead using the .dbml file.
Thanks in advance.
http://imgur.com/YQ7RE
XtraReport have xrTables, xrLabel controls, they will let you to create custom report and after that you can bind those cell etc and modify the XRControl bindings of the report in the following manner:
[C#]
...
// Original
//this.xrTableCell14.DataBindings.AddRange(new DevExpress.XtraReports.UI.XRBinding[] {
// new DevExpress.XtraReports.UI.XRBinding("Text", null, "Symbols.Description")});
// Modified
this.xrTableCell14.DataBindings.AddRange(new DevExpress.XtraReports.UI.XRBinding[] {
new DevExpress.XtraReports.UI.XRBinding("Text", null, "Description")});
...
Refer these links and samples..
Binding a Report to an Entity Framework object at runtime
[ How to
use LINQ to SQL data source to create a Master-Detail report
example