By default WCF Data Service do not support
Parametrized QueryInterceptor in some rare scenarios feel that
Parameterized Query Interceptor could have been a great solution.
However we can leverage custom parameters to archive
the same effect.
Solution
Unfortunately there is no direct support of providing parameters in QueryInterceptor but there is possibility to add custom support. belwo is step by step solution
Actually Data Service class provide a base member OperationContext that contains information about Absolute URL is being passed all you need to do is Intercept this Absolute URI and use it in your Query Interceptor. High level steps are below.
Add two new data member in your
data service class
|
DataServiceOperationContext OpsContext;
Dictionary<string,
string> QueryParameters;
|
Add an override ‘OnStartProcessingRequest
‘ to Initialized OpsContext
|
protected override
void OnStartProcessingRequest(ProcessRequestArgs args)
{
OpsContext =
args.OperationContext;
QueryParameters = GetQueryParameterBag(OpsContext);
base.OnStartProcessingRequest(args);
}
|
Implement a function to populate QueryParameters from incoming
URL
|
Dictionary<string,
string> GetQueryParameterBag(DataServiceOperationContext
serviceOperationContext)
……….<See code details Belwo>
|
Implement a Parameter Verification
function
[Optional]
|
void
VerifyEmployeesInterceptorParameters(Dictionary<string, string>
QueryParams)
|
Implement your interceptor that
calls Parameter Verification Function and consume QueryParameters collection
|
[QueryInterceptor("vEmployees")]
public
Expression<Func<vEmployee, bool>>
FilterEmplyee()
{
VerifyEmployeesInterceptorParameters(this.QueryParameters);
string
FirstName = QueryParameters["FirstName"];
return
o => (o.FirstName.StartsWith(FirstName));
}
|
Once above steps are applied you can use URL Query parameters to bind with Query Interceptors i.e.
http://localhost:2545/WcfDataService1.svc/vEmployees?FirstName=Rober
Limitation of solution
This solution will not work if entity
paging is enabled i.e. custom parameters will not be forwarded to next
page url , this is a data service limitation please refer to MSDN thread
"Custom Query Options and Server Driven Paging" for more detailsComplete Data Service Class File
Note :- Code
Attached the the very bottom suggest standard approach i.e. putting
Parameter collection object and parameter verification separate function
but can be placed in Query interceptor itself if there is no reuse
required.
//-----------------------------------------------------------------------
// <copyright
file="ServerHelpers.cs" company="None">
// None
//
</copyright>
//-----------------------------------------------------------------------
namespace SampleDataService
{
using
System;
using
System.Collections.Generic;
using
System.Data.Services;
using
System.Data.Services.Common;
using
System.Linq;
using
System.ServiceModel.Web;
using
System.Web;
using
System.Linq.Expressions;
[System.ServiceModel.ServiceBehavior(IncludeExceptionDetailInFaults =
true)]
public class WCFDataService
: DataService<NORTHWNDEntities>
{
DataServiceOperationContext
OpsContext;
Dictionary<string, string>
QueryParameters;
// This
method is called only once to initialize service-wide policies.
public
static void
InitializeService(DataServiceConfiguration
config)
{
//
TODO: set rules to indicate which entity sets and service operations are
visible, updatable, etc.
//
Examples:
config.UseVerboseErrors = true;
config.SetEntitySetAccessRule("*", EntitySetRights.AllRead);
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
}
Dictionary<string, string>
GetQueryParameterBag(DataServiceOperationContext
serviceOperationContext)
{
Dictionary<string, string>
ParameterBag = null;
string
query = serviceOperationContext.AbsoluteRequestUri.Query;
if
(!string.IsNullOrEmpty(query))
{
ParameterBag = new Dictionary<string, string>();
query = query.Remove(0, 1);
string[]
param = query.Split('&');
string
paramName;
string
paramValue;
foreach
(var item in
param)
if(!item.StartWith("$")
{ paramName = item.Substring(0, item.IndexOf("="));
paramValue =
item.Substring(item.IndexOf("=")
+ 1);
ParameterBag.Add(paramName, paramValue);
}
}
}
return
ParameterBag;
}
protected
override void
OnStartProcessingRequest(ProcessRequestArgs
args)
{
OpsContext =
args.OperationContext;
QueryParameters =
GetQueryParameterBag(OpsContext);
base.OnStartProcessingRequest(args);
}
void
VerifyEmployeesInterceptorParameters(Dictionary<string, string>
QueryParams)
{
if
(QueryParams==null||!QueryParams.Keys.Contains("FirstName"))
{
throw
new ArgumentException("Expecting parameter 'FirstName' but not
found");
}
}
[QueryInterceptor("Employees")]
public
Expression<Func<Employee, bool>>
FilterEmplyee()
{
VerifyEmployeesInterceptorParameters(this.QueryParameters);
string
FirstName = QueryParameters["FirstName"];
return
o => (o.FirstName.StartsWith(FirstName));
}
}
}
|
Nice post. You might want to wrap your loop that builds the parameter dictionary "if (item[0] != '$')" to exclude the standard oData parameters from the list. Also, I am providing an alternate method for passing parameters from the client below. this took me a while to find so it might help other readers.
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