public FtsEntityReferenceVisitor(FtsContainsMethodDescriptor descriptor)
{
_descriptor = descriptor;
}
protected override Expression VisitMethodCall(MethodCallExpression node)
{
if (node.Method.Name == nameof(SqlServerDbFunctionsExtensions.Contains) &&
node.Method.DeclaringType == typeof(SqlServerDbFunctionsExtensions))
{
MethodInfo methodInfo = null;
if (node.Arguments.Count == 3)
{
methodInfo = Contains3Args;
}
else if (node.Arguments.Count == 4)
{
methodInfo = Contains4Args;
}
if (methodInfo != null)
{
var descriptor = new FtsContainsMethodDescriptor();
_ = new FtsPropertyReferenceVisitor(descriptor).Visit(node.Arguments[1]);
var methodParams = new List <Expression>
{
Expression.Constant(_ftsInterceptionProvider),
descriptor.EntityReference,
descriptor.PropertyReference,
};
methodParams.AddRange(node.Arguments.Skip(2));
return(Expression.Call(methodInfo, methodParams.ToArray()));
}
}
else
if (node.Method.Name == nameof(List <string> .Contains) &&
node.Method.DeclaringType == typeof(List <string>) && node.Object != null)
{
//replaces to Enumerable.Contains(List<string>, arg1, StringComparer.OrdinalIgnoreCase)
return(Expression.Call(InvariantEnumerableContains,
node.Object,
node.Arguments.First(),
Expression.Constant(StringComparer.OrdinalIgnoreCase)));
}
else
if (node.Method.Name == nameof(Enumerable.Contains) &&
node.Method.DeclaringType == typeof(Enumerable) && node.Arguments.Count == 2 &&
typeof(IEnumerable <string>).IsAssignableFrom(node.Arguments[0].Type))
{
//replaces to Enumerable.Contains(IEnumerable<string>, arg1, StringComparer.OrdinalIgnoreCase)
var args = new List <Expression>(node.Arguments)
{
Expression.Constant(StringComparer.OrdinalIgnoreCase)
};
return(Expression.Call(InvariantEnumerableContains, args));
}
else
if (node.Method.Name == nameof(string.Contains) && node.Method.DeclaringType == typeof(string) &&
node.Object != null)
{
//replaces to string.IndexOf(arg1, StringComparison.OrdinalIgnoreCase) >= 0
return(Expression.GreaterThanOrEqual(
Expression.Call(node.Object, StringIndexOf, node.Arguments[0],
Expression.Constant(StringComparison.OrdinalIgnoreCase)),
Expression.Constant(0)));
}
return(base.VisitMethodCall(node));
}
