I want to make [DisplayFormat(ConvertEmptyStringToNull = false)] the default behaviour for my fields in an ASP.NET Core web application.
Related questions are for .NET Framework, and I am unsure on how to proceed with .NET Core
Related:
Set default for DisplayFormatAttribute.ConvertEmptyStringToNull to false across site
Set default for DisplayFormatAttribute.ConvertEmptyStringToNull to false
http://puredotnetcoder.blogspot.com/2013/09/convertemptystringtonull-in-mvc.html
I tried the following based on this post, but it doesn't work and also breaks the attribute when I tried to include it anyways
public class EmptyStringAllowedModelMetadataProvider : DefaultModelMetadataProvider
{
public EmptyStringAllowedModelMetadataProvider(ICompositeMetadataDetailsProvider detailsProvider) : base(detailsProvider)
{
}
public EmptyStringAllowedModelMetadataProvider(ICompositeMetadataDetailsProvider detailsProvider, IOptions<MvcOptions> optionsAccessor) : base(detailsProvider, optionsAccessor)
{
}
public override ModelMetadata GetMetadataForType(Type modelType)
{
if (modelType != typeof(string)) return base.GetMetadataForType(modelType);
var identity = ModelMetadataIdentity.ForType(modelType);
var details = CreateTypeDetails(identity);
var context = new DisplayMetadataProviderContext(identity, details.ModelAttributes);
DetailsProvider.CreateDisplayMetadata(context);
details.DisplayMetadata = context.DisplayMetadata;
details.DisplayMetadata.ConvertEmptyStringToNull = false;
return CreateModelMetadata(details);
}
}
You can refer to the following way, it works fine:
CustomMetadataProvider:
public class CustomMetadataProvider : IMetadataDetailsProvider, IDisplayMetadataProvider
{
public void CreateDisplayMetadata(DisplayMetadataProviderContext context)
{
if (context.Key.MetadataKind == ModelMetadataKind.Property)
{
context.DisplayMetadata.ConvertEmptyStringToNull = false;
}
}
}
registration serviceļ¼
services.AddMvc()
.AddMvcOptions(options => options.ModelMetadataDetailsProviders.Add(new CustomMetadataProvider()));
Test Result:
Related
Please I need your help to solve FluentValidation issue. I have an old desktop application which I wrote a few years ago. I used FluentValidation Ver 4 and Now I'm trying to upgrade this application to use .Net framework 4.8 and FluentValidation Ver 10, but unfortunately, I couldn't continue because of an exception that I still cannot fix.
I have this customer class:
class Customer : MyClassBase
{
string _CustomerName = string.Empty;
public string CustomerName
{
get { return _CustomerName; }
set
{
if (_CustomerName == value)
return;
_CustomerName = value;
}
}
class CustomerValidator : AbstractValidator<Customer>
{
public CustomerValidator()
{
RuleFor(obj => obj.CustomerName).NotEmpty().WithMessage("{PropertyName} is Empty");
}
}
protected override IValidator GetValidator()
{
return new CustomerValidator();
}
}
This is my base class:
class MyClassBase
{
public MyClassBase()
{
_Validator = GetValidator();
Validate();
}
protected IValidator _Validator = null;
protected IEnumerable<ValidationFailure> _ValidationErrors = null;
protected virtual IValidator GetValidator()
{
return null;
}
public IEnumerable<ValidationFailure> ValidationErrors
{
get { return _ValidationErrors; }
set { }
}
public void Validate()
{
if (_Validator != null)
{
var context = new ValidationContext<Object>(_Validator);
var results = _Validator.Validate(context); **// <======= Exception is here in this line**
_ValidationErrors = results.Errors;
}
}
public virtual bool IsValid
{
get
{
if (_ValidationErrors != null && _ValidationErrors.Count() > 0)
return false;
else
return true;
}
}
}
When I run the application test I get the below exception:
System.InvalidOperationException HResult=0x80131509 Message=Cannot
validate instances of type 'CustomerValidator'. This validator can
only validate instances of type 'Customer'. Source=FluentValidation
StackTrace: at
FluentValidation.ValidationContext1.GetFromNonGenericContext(IValidationContext context) in C:\Projects\FluentValidation\src\FluentValidation\IValidationContext.cs:line 211 at FluentValidation.AbstractValidator1.FluentValidation.IValidator.Validate(IValidationContext
context)
Please, what is the issue here and How can I fix it?
Thank you
Your overall implementation isn't what I'd consider normal usage however the problem is that you're asking FV to validate the validator instance, rather than the customer instance:
var context = new ValidationContext<Object>(_Validator);
var results = _Validator.Validate(context);
It should start working if you change it to:
var context = new ValidationContext<object>(this);
var results = _Validator.Validate(context);
You're stuck with using the object argument for the validation context unless you introduce a generic argument to the base class, or create it using reflection.
I needed to add a property to a model and I have implemented what is suggested in the selected answer here and it's working in that it removes the property I have tagged with SwaggerIgnorePropertyAttribute attribute of the model.
My question is , if I have several API versions of my application,how to remove it from the swagger doc/schema for certain versions? I only care not to see the added property in swagger. I only really have 1 version of the model across the application even though I have several version of the app.
I added the version like this:
services.AddSwaggerGen(
swaggerOptions =>
{
swaggerOptions.SwaggerDoc(
"v1",
new Info
{
Title = "Titlebla1",
Description = "bla1",
Version = "v1"
});
swaggerOptions.SwaggerDoc(
"v2",
new Info
{
Title = "Titlebla2",
Description = "bla2",
Version = "v2"
});
etc
I know that I can find the version by using SwaggerDocument and doing something like this: swaggerDoc.Info.Version but how can I get access to SwaggerDocument from the Apply in my SwaggerExcludePropertySchemaFilter class below ?
private class SwaggerExcludePropertySchemaFilter : ISchemaFilter
{
public void Apply(Schema schema, SchemaFilterContext context)
{
if (schema?.Properties == null)
{
return;
}
var excludedProperties = context.SystemType.GetProperties().Where(t => t.GetCustomAttribute<SwaggerIgnorePropertyAttribute>() != null);
foreach (var excludedProperty in excludedProperties)
{
var propertyToRemove = schema.Properties.Keys.SingleOrDefault(x => string.Equals(x, excludedProperty.Name, StringComparison.OrdinalIgnoreCase));
if (propertyToRemove != null)
{
schema.Properties.Remove(propertyToRemove);
}
}
}
}
Try use IDocumentFilter , see example:
public class CustomSwaggerFilter : IDocumentFilter
{
public void Apply(OpenApiDocument swaggerDoc, DocumentFilterContext context)
{
var nonRequiredMYPropertyAPIs = swaggerDoc.Paths
.Where(x => !x.Key.ToLower().Contains("v1") /*the version you want to remove the property */)
.ToList();
nonRequiredMYPropertyAPIs.ForEach(x => {
swaggerDoc.Components.Schemas["YOUR_CLASS_MODEL"]
.Properties.Remove("PROPERTY_NAME_YOU_WANT_TO_IGNORE");
});
}
}
Don't forget register the filter:
c.DocumentFilter<CustomSwaggerFilter>();
I've built an MVC 5 intranet web app in the company I work for. It's built using windows authentication and impersonates the user of the app.
On the backend, there is a centralized security database which has an employee table, a role table and a bridge table to join both.
There is an MVC view which is basically a datatable with employees and permissions, pivoted. Users connect to the webapp, the webapps reads the username and checks SQL Server to see what permissions they have. Therefore it's very easy for administrators to authorize use of the site with a nice front end.
Here's the issue - when I assign 'SRPE' permission to myself (which successfully adds the record to the bridge table), I expect to see that change reflected. Effectively this permission, if true, makes MVC return an alternative view for one of the views I've built. Anyway, it doesn't work.
The actual result is that nothing happens, i.e. the same view is being returned. By the way this is all running from VS for now. So by accident I managed to cause an error in the app during some other operation and funnily enough when I fixed the bug and restarted the site, the permission was reflected.
What I don't understand is why the permission isn't reflected during runtime. This design pattern I've used all over. The security class looks like this:
using System;
using System.Linq;
using MDMWebApp.Models;
namespace MDMWebApp.Security
{
public class MenuSecurity
{
// DMPA DMP Admin
// EIPA EIP Admin
// EIPU EIP User
// SRPA Standard Reporting Admin
// SRPE Standard Reporting Entity User
// SRPM Standard Reporting Master Data Contributer
// SRPU Standard Reporting User
private static SecurityDbContext _context = new SecurityDbContext();
private vEmployeeRole employeeRole = _context.vEmployeeRoles.SingleOrDefault(er => er.Username == Environment.UserName);
private bool isOnSystem => employeeRole != null ? true : false;
private bool isDMPAdmin => employeeRole.DMPA;
private bool isEIPAdmin => employeeRole.EIPA;
private bool isEIPUser => employeeRole.EIPU;
private bool isStandardReportingAdmin => employeeRole.SRPA;
private bool isStandardReportingEntityUser => employeeRole.SRPE;
private bool isStandardReportingMasterDataContributer => employeeRole.SRPM;
private bool isStandardReportingUser => employeeRole.SRPU;
public bool CanUseSystem
{
get { return isOnSystem; }
}
public bool DMPAdmin
{
get
{
return isDMPAdmin;
}
}
public bool EIPAdmin
{
get
{
return isDMPAdmin || isEIPAdmin;
}
}
public bool CanSeeEIP
{
get
{
return isDMPAdmin || isEIPAdmin || isEIPUser;
}
}
public bool StandardReportingEntityUser
{
get
{
return isStandardReportingEntityUser;
}
}
public bool StandardReportingMasterDataContributer
{
get
{
return isDMPAdmin || isStandardReportingAdmin || isStandardReportingMasterDataContributer;
}
}
}
}
and controller/action in question:
public ActionResult TaskTracker()
{
var lastWeekEnding = DateTime.Now.AddDays(-7);
var taskTracker = _context.TaskTracker.Where(d => d.WeekEnding >= lastWeekEnding);
MenuSecurity ms = new MenuSecurity();
if (ms.StandardReportingEntityUser)
{
return View("TaskTrackerEntity",taskTracker);
}
else return View("TaskTracker", taskTracker);
}
Does MVC not execute the action on hitting the appropriate route and then do a fresh retrieval of permissions at action execution time?
Finally resolved the issue. By implementing the using statement in the MenuSecurity class, the connection was disposed of after each use, thus retrieving fresh records each time. To do this I used an initialization method and called it each time I created a new instance of Menu Security.
Here is the updated class:
using System;
using System.Linq;
using MDMWebApp.Models;
namespace MDMWebApp.Security
{
public class MenuSecurity
{
// DMPA DMP Admin
// EIPA EIP Admin
// EIPU EIP User
// SRPA Standard Reporting Admin
// SRPE Standard Reporting Entity User
// SRPM Standard Reporting Master Data Contributer
// SRPU Standard Reporting User
private bool isOnSystem;
private bool isDMPAdmin;
private bool isEIPAdmin;
private bool isEIPUser;
private bool isStandardReportingAdmin;
private bool isStandardReportingEntityUser;
private bool isStandardReportingMasterDataContributer;
private bool isStandardReportingUser;
public void Initialize()
{
using (var _context = new SecurityDbContext())
{
var employeeRole = _context.vEmployeeRoles.SingleOrDefault(er => er.Username == Environment.UserName);
isOnSystem = employeeRole != null ? true : false;
isDMPAdmin = employeeRole.DMPA;
isEIPAdmin = employeeRole.EIPA;
isEIPUser = employeeRole.EIPU;
isStandardReportingAdmin = employeeRole.SRPA;
isStandardReportingEntityUser = employeeRole.SRPE;
isStandardReportingMasterDataContributer = employeeRole.SRPM;
isStandardReportingUser = employeeRole.SRPU;
}
}
public bool CanUseSystem
{
get { return isOnSystem; }
}
public bool DMPAdmin
{
get
{
return isDMPAdmin;
}
}
public bool EIPAdmin
{
get
{
return isDMPAdmin || isEIPAdmin;
}
}
public bool CanSeeEIP
{
get
{
return isDMPAdmin || isEIPAdmin || isEIPUser;
}
}
public bool StandardReportingEntityUser
{
get
{
return isStandardReportingEntityUser;
}
}
public bool StandardReportingMasterDataContributer
{
get
{
return isDMPAdmin || isStandardReportingAdmin || isStandardReportingMasterDataContributer;
}
}
}
}
Currently we are building a web application, desktop first, that needs device specific Razor Pages for specific pages. Those pages are really different from their Desktop version and it makes no sense to use responsiveness here.
We have tried to implement our own IViewLocationExpander and also tried to use the MvcDeviceDetector library (which is basically doing the same). Detection of the device type is no problem but for some reason the device specific page is not picked up and it is constantly falling back to the default Index.cshtml.
(edit: We're thinking about implementing something based on IPageConvention, IPageApplicationModelProvider or something ... ;-))
Index.mobile.cshtml
Index.cshtml
We have added the following code using the example of MvcDeviceDetector:
public static IMvcBuilder AddDeviceDetection(this IMvcBuilder builder)
{
builder.Services.AddDeviceSwitcher<UrlSwitcher>(
o => { },
d => {
d.Format = DeviceLocationExpanderFormat.Suffix;
d.MobileCode = "mobile";
d.TabletCode = "tablet";
}
);
return builder;
}
and are adding some route mapping
routes.MapDeviceSwitcher();
We expected to see Index.mobile.cshtml to be picked up when selecting a Phone Emulation in Chrome but that didnt happen.
edit Note:
we're using a combination of Razor Views/MVC (older sections) and Razor Pages (newer sections).
also not every page will have a mobile implementation. That's what would have a IViewLocationExpander solution so great.
edit 2
I think the solution would be the same as how you'd implement Culture specific Razor Pages (which is also unknown to us ;-)). Basic MVC supports Index.en-US.cshtml
Final Solution Below
If this is a Razor Pages application (as opposed to an MVC application) I don't think that the IViewLocationExpander interface is much use to you. As far as I know, it only works for partials, not routeable pages (i.e. those with an #page directive).
What you can do instead is to use Middleware to determine whether the request comes from a mobile device, and then change the file to be executed to one that ends with .mobile. Here's a very rough and ready implementation:
public class MobileDetectionMiddleware
{
private readonly RequestDelegate _next;
public async Task Invoke(HttpContext context)
{
if(context.Request.IsFromAMobileDevice())
{
context.Request.Path = $"{context.Request.Path}.mobile";
}
await _next.Invoke(context);
}
}
It's up to you how you want to implement the IsFromAMobileDevice method to determine the nature of the user agent. There's nothing stopping you using a third party library that can do the check reliably for you. Also, you will probably only want to change the path under certain conditions - such as where there is a device specific version of the requested page.
Register this in your Configure method early:
app.UseMiddleware<MobileDetectionMiddleware>();
I've finally found the way to do it convention based. I have implemented a IViewLocationExpander in order to tackle the device handling for basic Razor Views (including Layouts) and I've implemented IPageRouteModelConvention + IActionConstraint to handle devices for Razor Pages.
Note: this solution only seems to be working on ASP.NET Core 2.2 and up though. For some reason 2.1.x and below is clearing the constraints (tested with a breakpoint in a destructor) after they've been added (can probably be fixed).
Now I can have /Index.mobile.cshtml /Index.desktop.cshtml etc. in both MVC and Razor Pages.
Note: This solution can also be used to implement a language/culture specific Razor Pages (eg. /Index.en-US.cshtml /Index.nl-NL.cshtml)
public class PageDeviceConvention : IPageRouteModelConvention
{
private readonly IDeviceResolver _deviceResolver;
public PageDeviceConvention(IDeviceResolver deviceResolver)
{
_deviceResolver = deviceResolver;
}
public void Apply(PageRouteModel model)
{
var path = model.ViewEnginePath; // contains /Index.mobile
var lastSeparator = path.LastIndexOf('/');
var lastDot = path.LastIndexOf('.', path.Length - 1, path.Length - lastSeparator);
if (lastDot != -1)
{
var name = path.Substring(lastDot + 1);
if (Enum.TryParse<DeviceType>(name, true, out var deviceType))
{
var constraint = new DeviceConstraint(deviceType, _deviceResolver);
for (var i = model.Selectors.Count - 1; i >= 0; --i)
{
var selector = model.Selectors[i];
selector.ActionConstraints.Add(constraint);
var template = selector.AttributeRouteModel.Template;
var tplLastSeparator = template.LastIndexOf('/');
var tplLastDot = template.LastIndexOf('.', template.Length - 1, template.Length - Math.Max(tplLastSeparator, 0));
template = template.Substring(0, tplLastDot); // eg Index.mobile -> Index
selector.AttributeRouteModel.Template = template;
var fileName = template.Substring(tplLastSeparator + 1);
if ("Index".Equals(fileName, StringComparison.OrdinalIgnoreCase))
{
selector.AttributeRouteModel.SuppressLinkGeneration = true;
template = selector.AttributeRouteModel.Template.Substring(0, Math.Max(tplLastSeparator, 0));
model.Selectors.Add(new SelectorModel(selector) { AttributeRouteModel = { Template = template } });
}
}
}
}
}
protected class DeviceConstraint : IActionConstraint
{
private readonly DeviceType _deviceType;
private readonly IDeviceResolver _deviceResolver;
public DeviceConstraint(DeviceType deviceType, IDeviceResolver deviceResolver)
{
_deviceType = deviceType;
_deviceResolver = deviceResolver;
}
public int Order => 0;
public bool Accept(ActionConstraintContext context)
{
return _deviceResolver.GetDeviceType() == _deviceType;
}
}
}
public class DeviceViewLocationExpander : IViewLocationExpander
{
private readonly IDeviceResolver _deviceResolver;
private const string ValueKey = "DeviceType";
public DeviceViewLocationExpander(IDeviceResolver deviceResolver)
{
_deviceResolver = deviceResolver;
}
public void PopulateValues(ViewLocationExpanderContext context)
{
var deviceType = _deviceResolver.GetDeviceType();
if (deviceType != DeviceType.Other)
context.Values[ValueKey] = deviceType.ToString();
}
public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
{
var deviceType = context.Values[ValueKey];
if (!string.IsNullOrEmpty(deviceType))
{
return ExpandHierarchy();
}
return viewLocations;
IEnumerable<string> ExpandHierarchy()
{
var replacement = $"{{0}}.{deviceType}";
foreach (var location in viewLocations)
{
if (location.Contains("{0}"))
yield return location.Replace("{0}", replacement);
yield return location;
}
}
}
}
public interface IDeviceResolver
{
DeviceType GetDeviceType();
}
public class DefaultDeviceResolver : IDeviceResolver
{
public DeviceType GetDeviceType() => DeviceType.Mobile;
}
public enum DeviceType
{
Other,
Mobile,
Tablet,
Normal
}
Startup
services.AddMvc(o => { })
.SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
.AddRazorOptions(o =>
{
o.ViewLocationExpanders.Add(new DeviceViewLocationExpander(new DefaultDeviceResolver()));
})
.AddRazorPagesOptions(o =>
{
o.Conventions.Add(new PageDeviceConvention(new DefaultDeviceResolver()));
});
I recently upgraded an application I am working on from Cocktail 1.4 to Cocktail 2.6 (Punch). I have adjusted my bootstrapper class for the wpf project which now loads with no issues. However, on my WCF / Web projects, I am receiving a runtime exception with the following error when attempting to call Composition.GetInstance:
"You must first set a valid CompositionProvider by using Composition.SetProvider."
After digging into the issue a bit, it appears the composition container is automatically configured when your bootstrapper inherits from CocktailMefBootstrapper. I currently do not have bootstrapper classes at all for non-wpf projects. Prior to the upgrade, all I had to do was call the configure method on the Composition class to configure the composition container, but it appears that it has been deprecated:
Composition.Configure();
I noticed that you can also call Composition.SetProvider(), however I am a little unsure on how to satisfy the method signature exactly. The DevForce Punch documentation states that the generic type for the bootstrapper class should be a viewmodel, and there are no views / view models in a service project. This leaves me in limbo on what to do as I don't want to rip cocktail out of these WCF projects. Is there still a way to use Cocktail's composition container without a bootstrapper for a project in Cocktail (Punch) 2.6?
UPDATE
I found this on the DevForce forums. So it appears that I ought to learn how to configure a multi threaded ICompositionProvider and call Composition.SetProvider() as mentioned above. Any recommended articles to achieving this?
After digging through Punch's source code and looking at Ideablade's MefCompositionContainer, which implements ICompositionProvider, I created my own thread safe implementation of ICompositionProvider. Below is the code I used. Basically, it's the same code for Ideablade's MefCompositionContainer which can be found here in their repository. The only change is that I am passing a bool flag of true into the CompositionContainer's constructor. MSDN lists the pros and cons of making the container thread safe
internal partial class ThreadSafeCompositionProvider : ICompositionProvider
{
static ThreadSafeCompositionProvider()
{
CompositionHost.IgnorePatterns.Add("Caliburn.Micro*");
CompositionHost.IgnorePatterns.Add("Windows.UI.Interactivity*");
CompositionHost.IgnorePatterns.Add("Cocktail.Utils*");
CompositionHost.IgnorePatterns.Add("Cocktail.Compat*");
CompositionHost.IgnorePatterns.Add("Cocktail.dll");
CompositionHost.IgnorePatterns.Add("Cocktail.SL.dll");
CompositionHost.IgnorePatterns.Add("Cocktail.WinRT.dll");
}
public IEnumerable<Assembly> GetProbeAssemblies()
{
IEnumerable<Assembly> probeAssemblies = CompositionHost.Instance.ProbeAssemblies;
var t = GetType();
// Add Cocktail assembly
probeAssemblies = probeAssemblies.Concat(GetType().GetAssembly());
return probeAssemblies.Distinct(x => x);
}
private List<Assembly> _probeAssemblies;
private AggregateCatalog _defaultCatalog;
private ComposablePartCatalog _catalog;
private CompositionContainer _container;
public ComposablePartCatalog Catalog
{
get { return _catalog ?? DefaultCatalog; }
}
public ComposablePartCatalog DefaultCatalog
{
get
{
if (_defaultCatalog == null)
{
_probeAssemblies = GetProbeAssemblies().ToList();
var mainCatalog = new AggregateCatalog(_probeAssemblies.Select(x => new AssemblyCatalog(x)));
_defaultCatalog = new AggregateCatalog(mainCatalog);
CompositionHost.Recomposed += new EventHandler<RecomposedEventArgs>(OnRecomposed)
.MakeWeak(x => CompositionHost.Recomposed -= x);
}
return _defaultCatalog;
}
}
internal void OnRecomposed(object sender, RecomposedEventArgs args)
{
if (args.HasError) return;
var newAssemblies = GetProbeAssemblies()
.Where(x => !_probeAssemblies.Contains(x))
.ToList();
if (newAssemblies.Any())
{
var catalog = new AggregateCatalog(newAssemblies.Select(x => new AssemblyCatalog(x)));
_defaultCatalog.Catalogs.Add(catalog);
_probeAssemblies.AddRange(newAssemblies);
}
// Notify clients of the recomposition
var handlers = Recomposed;
if (handlers != null)
handlers(sender, args);
}
public CompositionContainer Container
{
get { return _container ?? (_container = new CompositionContainer(Catalog, true)); }
}
public Lazy<T> GetInstance<T>() where T : class
{
var exports = GetExportsCore(typeof(T), null).ToList();
if (!exports.Any())
throw new Exception(string.Format("Could Not Locate Any Instances Of Contract", typeof(T).FullName));
return new Lazy<T>(() => (T)exports.First().Value);
}
public T TryGetInstance<T>() where T : class
{
if (!IsTypeRegistered<T>())
return null;
return GetInstance<T>().Value;
}
public IEnumerable<T> GetInstances<T>() where T : class
{
var exports = GetExportsCore(typeof(T), null);
return exports.Select(x => (T)x.Value);
}
public Lazy<object> GetInstance(Type serviceType, string contractName)
{
var exports = GetExportsCore(serviceType, contractName).ToList();
if (!exports.Any())
throw new Exception(string.Format("Could Not Locate Any Instances Of Contract",
serviceType != null ? serviceType.ToString() : contractName));
return new Lazy<object>(() => exports.First().Value);
}
public object TryGetInstance(Type serviceType, string contractName)
{
var exports = GetExportsCore(serviceType, contractName).ToList();
if (!exports.Any())
return null;
return exports.First().Value;
}
public IEnumerable<object> GetInstances(Type serviceType, string contractName)
{
var exports = GetExportsCore(serviceType, contractName);
return exports.Select(x => x.Value);
}
public ICompositionFactory<T> GetInstanceFactory<T>() where T : class
{
var factory = new ThreadSafeCompositionFactory<T>();
Container.SatisfyImportsOnce(factory);
if (factory.ExportFactory == null)
throw new CompositionException(string.Format("No export found.", typeof(T)));
return factory;
}
public ICompositionFactory<T> TryGetInstanceFactory<T>() where T : class
{
var factory = new ThreadSafeCompositionFactory<T>();
Container.SatisfyImportsOnce(factory);
if (factory.ExportFactory == null)
return null;
return factory;
}
public void BuildUp(object instance)
{
// Skip if in design mode.
if (DesignTime.InDesignMode())
return;
Container.SatisfyImportsOnce(instance);
}
public bool IsRecomposing { get; internal set; }
public event EventHandler<RecomposedEventArgs> Recomposed;
internal bool IsTypeRegistered<T>() where T : class
{
return Container.GetExports<T>().Any();
}
public void Configure(CompositionBatch compositionBatch = null, ComposablePartCatalog catalog = null)
{
_catalog = catalog;
var batch = compositionBatch ?? new CompositionBatch();
if (!IsTypeRegistered<IEventAggregator>())
batch.AddExportedValue<IEventAggregator>(new EventAggregator());
Compose(batch);
}
public void Compose(CompositionBatch compositionBatch)
{
if (compositionBatch == null)
throw new ArgumentNullException("compositionBatch");
Container.Compose(compositionBatch);
}
private IEnumerable<Lazy<object>> GetExportsCore(Type serviceType, string key)
{
return Container.GetExports(serviceType, null, key);
}
}
After setting up that class, I added a configuration during startup to instantiate my new thread safe composition provider and to set it as the provider for Punch's Composition class:
if (createThreadSafeCompositionContainer)
{
var threadSafeContainer = new ThreadSafeCompositionProvider();
Composition.SetProvider(threadSafeContainer);
}
Seems to be working like a charm!