团结(在PRISM)

Question

我正在使用PRISM，在Bootstrapper类中，我确实重写了ConfigureContainer()方法。

protected override void ConfigureContainer()
{       
    Container.RegisterType<IDataContext, SQLDataContext>(new InjectionConstructor(@"Server=localhost\SQLExpress;User Id=sa;Password=xxxxx;Database=MyDatabase"));
        base.ConfigureContainer();
}

在“调试时”，我尝试调用Container.Resolve()，但这给了我以下错误：

异常消息是:当前生成操作(生成键生成{Microsoft.Practices.Unity.ResolutionFailedException}，空)失败:值不能为空。\r\n参数名称：

(策略类型BuildPlanStrategy，索引3)"} System.Exception System.Exception

但当我做的时候

Container.IsTypeRegistered(typeof(IDataContext))

我是真的！

• 我错过了什么？

作为答案发布的信息，它应该是对问题：的编辑。

这是完整的堆栈：

Microsoft.Practices.Unity.ResolutionFailedException: Resolution of the dependency failed, type = "Photo.DAL.Abstract.IDataContext", name = "". Exception message is: The current build operation (build key Build Key[Photo.DAL.Concrete.SQLDataContext, null]) failed: Value cannot be null.
Parameter name: stream (Strategy type BuildPlanStrategy, index 3) ---> Microsoft.Practices.ObjectBuilder2.BuildFailedException: The current build operation (build key Build Key[Photo.DAL.Concrete.SQLDataContext, null]) failed: Value cannot be null.
Parameter name: stream (Strategy type BuildPlanStrategy, index 3) ---> System.ArgumentNullException: Value cannot be null.
Parameter name: stream
   at System.Data.Linq.Mapping.XmlMappingSource.FromStream(Stream stream)
   at Photo.DAL.Mapping.GetMapping() in C:\Users\Savvas\Documents\Visual Studio 2008\Projects\Photo\Photo.DAL\Mapping.cs:line 18
   at Photo.DAL.Concrete.SQLDataContext..ctor(String connectionString) in C:\Users\Savvas\Documents\Visual Studio 2008\Projects\Photo\Photo.DAL\Concrete\SQLDataContext.cs:line 52
   at BuildUp_Photo.DAL.Concrete.SQLDataContext(IBuilderContext )
   at Microsoft.Practices.ObjectBuilder2.DynamicMethodBuildPlan.BuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.BuildPlanStrategy.PreBuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)
   --- End of inner exception stack trace ---
   at Microsoft.Practices.ObjectBuilder2.StrategyChain.ExecuteBuildUp(IBuilderContext context)
   at Microsoft.Practices.ObjectBuilder2.Builder.BuildUp(IReadWriteLocator locator, ILifetimeContainer lifetime, IPolicyList policies, IStrategyChain strategies, Object buildKey, Object existing)
   at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name)
   --- End of inner exception stack trace ---
   at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, Object existing, String name)
   at Microsoft.Practices.Unity.UnityContainer.DoBuildUp(Type t, String name)
   at Microsoft.Practices.Unity.UnityContainer.Resolve(Type t, String name)
   at Microsoft.Practices.Unity.UnityContainerBase.Resolve(Type t)
   at Microsoft.Practices.Unity.UnityContainerBase.Resolve[T]()
   at Photo.Desktop.Bootstrapper.ConfigureContainer() in C:\Users\Savvas\Documents\Visual Studio 2008\Projects\Photo\Photo.Desktop\Bootstrapper.cs:line 42

我注意到错误不是来自实际解析类，而是来自调用方法GetMapping()，该方法被定义为

public static class Mapping
    {
        public static XmlMappingSource GetMapping()
        {
            XmlMappingSource mapping;
            using (Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("Photo.DAL.Entities.Entities.map"))
            {
                mapping = XmlMappingSource.FromStream(stream);
            }
            return mapping;
        }
    }

• 是统一组织做不到的吗？(对温莎来说效果很好！)

Answer 1

这可能是两件事之一..。你的例外还不清楚..。

masked?

• Otherwise可能是另一个内部异常，可能是您的SqlDataContext类有一个接受流？

的构造函数。

同样，例外情况还不够清楚(至少对我来说是这样)。如果这些建议都没有帮助，你能在你的问题中贴出$exception.ToString()的全部内容吗？

编辑:根据您的完整堆栈跟踪，失败的代码行是这样的：

using (Stream stream = Assembly.
                       GetExecutingAssembly().
                       GetManifestResourceStream("Photo.DAL.Entities.Entities.map"))
{
    //This line is failing with null argument
    mapping = XmlMappingSource.FromStream(stream);
}

您的资源流将返回null，这表明您的资源不存在，或者程序集无法加载(有时这是指附属程序集)。我怀疑前第一个..。检查以确保.map文件上的构建设置是正确的。