// Adds Value = ... and ClassID = ... member decorations to all NewExpressions for MetaID within the given expression.
private Expression <Func <IDatabaseResultRow, object> > AddNewMetaIDMemberDecoration(Expression <Func <IDatabaseResultRow, object> > expression)
{
return(AdHocExpressionVisitor.TransformAndRetainType(
expression,
expr =>
{
var newExpression = expr as NewExpression;
if (newExpression != null && newExpression.Constructor.DeclaringType == typeof(MetaID))
{
return Expression.New(
newExpression.Constructor,
newExpression.Arguments,
new[] { typeof(MetaID).GetProperty("Value"), typeof(MetaID).GetProperty("ClassID") });
}
return expr;
}));
}
private Expression ReplaceConvertExpressionMarker(Expression simplifiedExpectedInMemoryProjection)
{
return(AdHocExpressionVisitor.Transform(simplifiedExpectedInMemoryProjection, expr =>
{
var methodCallExpression = expr as MethodCallExpression;
if (methodCallExpression != null && methodCallExpression.Method.Name == "ConvertExpressionMarker")
{
var conversionMethodCall = methodCallExpression.Arguments.Single() as MethodCallExpression;
if (conversionMethodCall == null || conversionMethodCall.Object != null || conversionMethodCall.Arguments.Count != 1)
{
throw new InvalidOperationException(
"The argument to ConvertExpressionMarker must be a MethodCallExpression to a static method with a single argument.");
}
return Expression.Convert(conversionMethodCall.Arguments.Single(), conversionMethodCall.Type, conversionMethodCall.Method);
}
return expr;
}));
}