/// <summary>
/// Will be called when the expression is a binary expression. E.g. Id == "value" or Id.CompareTo("value") > 0
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
protected override Expression VisitBinary(BinaryExpression node)
{
MemberExpression propertyExpression = null;
//E.g. Id.CompareTo("value") > 0
if (node.Left is MethodCallExpression methodCallExpression)
{
propertyExpression = methodCallExpression.Object as MemberExpression;
}
//E.g. Id == "value"
else if (node.Left is MemberExpression)
{
propertyExpression = node.Left as MemberExpression;
}
//Checks if the member of the expression is the field 'Id'
if (propertyExpression?.Member?.Name == "Id")
{
//Pass the expression the IdValueUpdateVisitor to add the table prefix to the expression constant
var visitor = new IdValueUpdateVisitor();
node = visitor.Visit(node) as BinaryExpression;
}
return(base.VisitBinary(node));
}
/// <summary>
/// Will be called when the expression is a method call (A method that returns a boolean in our particular case)
/// E.g. Id.StartsWith("value") or Id.Contains("value")
/// </summary>
/// <param name="node"></param>
/// <returns></returns>
protected override Expression VisitMethodCall(MethodCallExpression node)
{
//We only want to modify the expression value if the method is 'StartsWith',
//because the entities in the collection are all prefixed with the table name
if (node.Method.Name == "StartsWith")
{
var visitor = new IdValueUpdateVisitor();
node = visitor.Visit(node) as MethodCallExpression;
}
return(base.VisitMethodCall(node));
}
