private static BinaryExpression RemoveUnnecessaryConverts(
BinaryExpression expression)
{
if (expression.Method != (MethodInfo)null || expression.Left.Type != expression.Right.Type)
{
return(expression);
}
switch (expression.Left.NodeType)
{
case ExpressionType.Constant:
ConstantExpression left1 = (ConstantExpression)expression.Left;
if (expression.Right.NodeType == ExpressionType.Convert)
{
UnaryExpression right = (UnaryExpression)expression.Right;
if (EntityExpressionVisitor.TryConvertConstant(ref left1, right.Operand.Type))
{
return(EntityExpressionVisitor.MakeBinaryExpression(expression.NodeType, (Expression)left1, right.Operand));
}
break;
}
break;
case ExpressionType.Convert:
UnaryExpression left2 = (UnaryExpression)expression.Left;
switch (expression.Right.NodeType)
{
case ExpressionType.Constant:
ConstantExpression right1 = (ConstantExpression)expression.Right;
if (EntityExpressionVisitor.TryConvertConstant(ref right1, left2.Operand.Type))
{
return(EntityExpressionVisitor.MakeBinaryExpression(expression.NodeType, left2.Operand, (Expression)right1));
}
break;
case ExpressionType.Convert:
UnaryExpression right2 = (UnaryExpression)expression.Right;
if (EntityExpressionVisitor.CanRemoveConverts(left2, right2))
{
return(EntityExpressionVisitor.MakeBinaryExpression(expression.NodeType, left2.Operand, right2.Operand));
}
break;
}
}
return(expression);
}
internal virtual Expression VisitComparison(BinaryExpression expression)
{
return(this.VisitBinary(EntityExpressionVisitor.RemoveUnnecessaryConverts(expression)));
}
