internal static bool IsMemberEqualsValueExpression(Expression exp, Type declaringType, string memberName)
{
if (exp.NodeType != ExpressionType.Equal)
{
return(false);
}
BinaryExpression be = (BinaryExpression)exp;
// Assert.
if (ExpressionTreeHelpers.IsSpecificMemberExpression(be.Left, declaringType, memberName) &&
ExpressionTreeHelpers.IsSpecificMemberExpression(be.Right, declaringType, memberName))
{
throw new Exception("Cannot have 'member' == 'member' in an expression!");
}
return(ExpressionTreeHelpers.IsSpecificMemberExpression(be.Left, declaringType, memberName) ||
ExpressionTreeHelpers.IsSpecificMemberExpression(be.Right, declaringType, memberName));
}
protected override Expression VisitBinary(BinaryExpression be)
{
if (be.NodeType == ExpressionType.Equal)
{
if (ExpressionTreeHelpers.IsMemberEqualsValueExpression(be, typeof(Place), "Name"))
{
locations.Add(ExpressionTreeHelpers.GetValueFromEqualsExpression(be, typeof(Place), "Name"));
return(be);
}
else if (ExpressionTreeHelpers.IsMemberEqualsValueExpression(be, typeof(Place), "State"))
{
locations.Add(ExpressionTreeHelpers.GetValueFromEqualsExpression(be, typeof(Place), "State"));
return(be);
}
else
{
return(base.VisitBinary(be));
}
}
else
{
return(base.VisitBinary(be));
}
}