/// <summary>
/// Initializes a new instance of the <see cref="DbProvider"/> class.
/// </summary>
/// <param name="dbMetadata">The db metadata.</param>
public DbProvider(IDbMetadata dbMetadata)
{
this.dbMetadata = dbMetadata;
newCommand = DynamicConstructor.Create(dbMetadata.CommandType.GetConstructor(Type.EmptyTypes));
newConnection = DynamicConstructor.Create(dbMetadata.ConnectionType.GetConstructor(Type.EmptyTypes));
newCommandBuilder = DynamicConstructor.Create(dbMetadata.CommandBuilderType.GetConstructor(Type.EmptyTypes));
newDataAdapter = DynamicConstructor.Create(dbMetadata.DataAdapterType.GetConstructor(Type.EmptyTypes));
newParameter = DynamicConstructor.Create(dbMetadata.ParameterType.GetConstructor(Type.EmptyTypes));
}
/// <summary>
/// Uses reflection to create an object using its
/// default constructor.
/// </summary>
/// <param name="objectType">Type of object to create.</param>
public static object CreateInstance(Type objectType)
{
DynamicConstructor cachedConstructor = MethodCaller.GetCachedConstructor(objectType);
if (cachedConstructor == null)
{
throw new NotImplementedException("Default Constructor not implemented.");
}
return(cachedConstructor());
}
/// <summary>
/// Initializes a new instance of the <see cref="DbProvider"/> class.
/// </summary>
/// <param name="dbMetadata">The db metadata.</param>
public DbProvider(IDbMetadata dbMetadata)
{
this.dbMetadata = dbMetadata;
newCommand = DynamicConstructor.Create(dbMetadata.CommandType.GetConstructor(Type.EmptyTypes));
// Oracle needs custom bind by name property set to true as it's false by default
var bindByNameProperty = dbMetadata.CommandType.GetProperty("BindByName");
if (bindByNameProperty != null && bindByNameProperty.CanWrite)
{
commandBindByName = DynamicProperty.Create(bindByNameProperty);
}
newConnection = DynamicConstructor.Create(dbMetadata.ConnectionType.GetConstructor(Type.EmptyTypes));
newCommandBuilder = DynamicConstructor.Create(dbMetadata.CommandBuilderType.GetConstructor(Type.EmptyTypes));
newDataAdapter = DynamicConstructor.Create(dbMetadata.DataAdapterType.GetConstructor(Type.EmptyTypes));
newParameter = DynamicConstructor.Create(dbMetadata.ParameterType.GetConstructor(Type.EmptyTypes));
}
private static DynamicConstructor GetCachedConstructor(Type objectType)
{
DynamicConstructor dynamicConstructor = null;
if (MethodCaller._ctorCache.TryGetValue(objectType, out dynamicConstructor))
{
return(dynamicConstructor);
}
lock (MethodCaller._ctorCache)
{
if (!MethodCaller._ctorCache.TryGetValue(objectType, out dynamicConstructor))
{
ConstructorInfo constructor = objectType.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, Type.EmptyTypes, null);
dynamicConstructor = DynamicMethodHandlerFactory.CreateConstructor(constructor);
MethodCaller._ctorCache.Add(objectType, dynamicConstructor);
}
}
return(dynamicConstructor);
}
private static DynamicConstructor GetCachedConstructor(Type objectType)
{
DynamicConstructor result = null;
if (_ctorCache.TryGetValue(objectType, out result))
{
return(result);
}
lock (_ctorCache)
{
if (!_ctorCache.TryGetValue(objectType, out result))
{
ConstructorInfo info = objectType.GetConstructor(ctorFlags, null, Type.EmptyTypes, null);
result = DynamicMethodHandlerFactory.CreateConstructor(info);
_ctorCache.Add(objectType, result);
}
}
return(result);
}
public static void Main()
{
var handler = new DynamicConstructor(typeof(SampleHandler1)).New();
invokeIConsumeFor(handler, "Sample Message");
}