我已为动态数据提供程序实现了WCF数据服务。我正在使用内存中的虚拟数据源。我的实现基于Alex D James的精彩系列：http://blogs.msdn.com/b/alexj/archive/2010/01/07/data-service-providers-getting-started.aspx
我的问题是，我能够通过客户端应用程序添加产品对象，响应也显示该对象已添加，但当我尝试通过客户端应用程序或浏览器通过产品密钥获取数据时，我收到错误消息“找不到段'DataSourceRecords'的资源。
我有这样的Initialize方法：
config.SetEntitySetAccessRule("*", EntitySetRights.All);
config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V3;
config.DataServiceBehavior.AcceptCountRequests = true;
config.DataServiceBehavior.AcceptProjectionRequests = true;
我正在使用动态数据提供程序：OrganizationDataService：DataService，IServiceProvider
其中OrganizationDataServiceProvider扩展了IDataServiceMetadataProvider并使用了我对OrganizationServiceContext的实现：
public class OrganizationServiceContext
{
private List<DummyDataSource> records = new List<DummyDataSource>();
private Dictionary<string, ResourceType> resourceTypes = new Dictionary<string, ResourceType>();
private Dictionary<string, ResourceSet> resourceSets = new Dictionary<string, ResourceSet>();
public OrganizationServiceContext()
{
PopulateMedataData(this);
}
private void AddResourceType(ResourceType resourceType)
{
//resourceType.SetReadOnly();
resourceTypes.Add(resourceType.FullName, resourceType);
}
private void AddResourceSet(ResourceSet resourceSet)
{
resourceSet.SetReadOnly();
resourceSets.Add(resourceSet.Name, resourceSet);
}
private void PopulateMedataData(OrganizationServiceContext orgServiceContext)
{
var productType = new ResourceType(
typeof(DummyDataSource), // CLR type backing this Resource
ResourceTypeKind.EntityType, // Entity, ComplexType etc
null, // BaseType
"Namespace", // Namespace
"DummyDataSource", // Name
false // Abstract?
);
var prodKey = new ResourceProperty(
"ProdKey",
ResourcePropertyKind.Key |
ResourcePropertyKind.Primitive,
ResourceType.GetPrimitiveResourceType(typeof(int))
);
var prodName = new ResourceProperty(
"Name",
ResourcePropertyKind.Primitive,
ResourceType.GetPrimitiveResourceType(typeof(string))
);
var prodPrice = new ResourceProperty(
"Price",
ResourcePropertyKind.Primitive,
ResourceType.GetPrimitiveResourceType(typeof(Decimal))
);
productType.AddProperty(prodKey);
productType.AddProperty(prodName);
productType.AddProperty(prodPrice);
orgServiceContext.AddResourceType(productType);
orgServiceContext.AddResourceSet(new ResourceSet("DataSourceRecords", productType));
}
public void PopulateContextData(OrganizationServiceContext orgServiceContext)
{
orgServiceContext.Records.Add(
new DummyDataSource
{
ProdKey = 1,
Name = "Janus",
Cost = 4.35M,
Price = 6.49M
});
orgServiceContext.Records.Add(
new DummyDataSource
{
ProdKey = 2,
Name = "Bugger",
Cost = 4.97M,
Price = 7.21M
});
}
public Dictionary<string, ResourceType> GetResourceType()
{
return this.resourceTypes;
}
public Dictionary<string, ResourceSet> GetResourceSet()
{
return this.resourceSets;
}
public IQueryable GetQueryable(ResourceSet set)
{
if (set.Name == "DataSourceRecords")
{
return this.Records.AsQueryable();
}
else
{
throw new NotSupportedException(string.Format("{0} not found", set.Name));
}
}
public List<DummyDataSource> Records
{
get
{
return this.records;
}
}
public object CreateResource(ResourceType resourceType)
{
if (resourceType.InstanceType == typeof(DummyDataSource))
{
Debug.WriteLine(string.Format("OrganizationServiceContext : CreateResource::If. resourceType = {0}, Context.HashCode = {1}", resourceType.InstanceType, this.GetHashCode()));
return new DummyDataSource();
}
else
{
Debug.WriteLine(string.Format("OrganizationServiceContext : CreateResource::Else. resourceType = {0}, Context.HashCode = {1}", resourceType.InstanceType, this.GetHashCode()));
throw new NotSupportedException(string.Format("{0} not found", resourceType.FullName));
}
}
public void AddResource(ResourceType resourceType, object resource)
{
if (resourceType.InstanceType == typeof(DummyDataSource))
{
DummyDataSource temp = resource as DummyDataSource;
if (temp != null)
{
Debug.WriteLine(string.Format("OrganizationServiceContext : AddResource. resourceType = {0}, resource = {1}, Context.HashCode = {2}", resourceType, resource, this.GetHashCode()));
this.Records.Add(temp);
//Below foreach loop is only for debug purpose, will be removed from final code.
foreach (var pr in Records)
{
Debug.WriteLine(string.Format("Prod Key = {0}, Name = {1}, Price = {2}", pr.ProdKey, pr.Name, pr.Price));
}
return;
}
}
else
{
throw new NotSupportedException("Type not found");
}
}
public void DeleteResource( object resource)
{
if (resource.GetType() == typeof(DummyDataSource))
{
this.Records.Remove(resource as DummyDataSource);
return;
}
else
{
throw new NotSupportedException("Type not found");
}
}
public void SaveChanges()
{
Debug.WriteLine(string.Format("OrganizationServiceContext : SaveChanges. Context.HashCode = {0}", this.GetHashCode()));
var prodKey = this.Records.Max(p => p.ProdKey);
foreach (var prod in this.Records.Where(p => p.ProdKey == 0))
{
prod.ProdKey = prodKey+1;
}
//Below foreach loop is only for debug purpose, will be removed from final code.
foreach (var pr in Records)
{
Debug.WriteLine(string.Format("Prod Key = {0}, Name = {1}, Price = {2}", pr.ProdKey, pr.Name, pr.Price));
}
}
}
任何人都可以帮我吗？
还有其他人遇到过这个问题吗？
答案 0 :(得分：0)
好的，问题是我的提供商是在每个请求上创建的，所以我把它们改成单身，现在一切都很好。