/// <summary>
/// Uses Code First with the given context and writes the resulting Entity Data Model to the given
/// writer in EDMX form. This method can only be used with context instances that use Code First
/// and create the model internally. The method cannot be used for contexts created using Database
/// First or Model First, for contexts created using a pre-existing <see cref="T:System.Data.Entity.Core.Objects.ObjectContext" />, or
/// for contexts created using a pre-existing <see cref="T:System.Data.Entity.Infrastructure.DbCompiledModel" />.
/// </summary>
/// <param name="context"> The context. </param>
/// <param name="writer"> The writer. </param>
public static void WriteEdmx(DbContext context, XmlWriter writer)
{
Check.NotNull <DbContext>(context, nameof(context));
Check.NotNull <XmlWriter>(writer, nameof(writer));
InternalContext internalContext = context.InternalContext;
if (internalContext is EagerInternalContext)
{
throw Error.EdmxWriter_EdmxFromObjectContextNotSupported();
}
DbModel beingInitialized = internalContext.ModelBeingInitialized;
if (beingInitialized != null)
{
EdmxWriter.WriteEdmx(beingInitialized, writer);
}
else
{
DbCompiledModel codeFirstModel = internalContext.CodeFirstModel;
if (codeFirstModel == null)
{
throw Error.EdmxWriter_EdmxFromModelFirstNotSupported();
}
DbModelBuilder dbModelBuilder = codeFirstModel.CachedModelBuilder.Clone();
EdmxWriter.WriteEdmx(internalContext.ModelProviderInfo == null ? dbModelBuilder.Build(internalContext.Connection) : dbModelBuilder.Build(internalContext.ModelProviderInfo), writer);
}
}
/// <summary>
/// Saves a model to the store.
/// </summary>
/// <param name="contextType">The type of context representing the model.</param>
/// <param name="model">The metadata model to save.</param>
public override void Save(Type contextType, DbModel model)
{
using (var writer = XmlWriter.Create(GetFilePath(contextType),
new XmlWriterSettings
{
Indent = true
}))
{
EdmxWriter.WriteEdmx(model, writer);
}
}
public void Read_loads_edmx_from_EdmxWriter_into_DbCompiledModel()
{
var stream = new MemoryStream();
var xmlWriter = XmlWriter.Create(stream);
using (var context = new EmptyContext())
{
EdmxWriter.WriteEdmx(context, xmlWriter);
}
stream.Seek(0, SeekOrigin.Begin);
var defaultSchema = "default";
var xmlReader = XmlReader.Create(stream);
var readModel = EdmxReader.Read(xmlReader, defaultSchema);
Assert.IsType <DbCompiledModel>(readModel);
Assert.Equal(defaultSchema, readModel.DefaultSchema);
Assert.NotNull(readModel.ProviderInfo);
}
