private Tuple <int, bool> GetCompareMode(DbExpressionKind kind)
{
switch (kind)
{
case DbExpressionKind.Equals:
return(Tuple.Create(0, true));
case DbExpressionKind.NotEquals:
return(Tuple.Create(0, false));
case DbExpressionKind.GreaterThan:
return(Tuple.Create(1, true));
case DbExpressionKind.GreaterThanOrEquals:
return(Tuple.Create(-1, false));
case DbExpressionKind.LessThan:
return(Tuple.Create(-1, true));
case DbExpressionKind.LessThanOrEquals:
return(Tuple.Create(1, false));
}
throw new InvalidOperationException(
"The ExpressionKind cannot be " + kind.ToString());
}
private Expression CreateComparison(Expression left, Expression right, DbExpressionKind kind)
{
if (left.Type == typeof(string) && right.Type == typeof(string))
{
return(CreateStringComparison(left, right, kind));
}
switch (kind)
{
case DbExpressionKind.Equals:
return(Expression.Equal(left, right));
case DbExpressionKind.NotEquals:
return(Expression.NotEqual(left, right));
case DbExpressionKind.GreaterThan:
return(Expression.GreaterThan(left, right));
case DbExpressionKind.GreaterThanOrEquals:
return(Expression.GreaterThanOrEqual(left, right));
case DbExpressionKind.LessThan:
return(Expression.LessThan(left, right));
case DbExpressionKind.LessThanOrEquals:
return(Expression.LessThanOrEqual(left, right));
default:
throw new InvalidOperationException(
"The ExpressionKind cannot be " + kind.ToString());
}
}
private Expression CreateComparison(Expression left, Expression right, DbExpressionKind kind)
{
if (left.Type == typeof(string) && right.Type == typeof(string))
{
return CreateStringComparison(left, right, kind);
}
switch (kind)
{
case DbExpressionKind.Equals:
return Expression.Equal(left, right);
case DbExpressionKind.NotEquals:
return Expression.NotEqual(left, right);
case DbExpressionKind.GreaterThan:
return Expression.GreaterThan(left, right);
case DbExpressionKind.GreaterThanOrEquals:
return Expression.GreaterThanOrEqual(left, right);
case DbExpressionKind.LessThan:
return Expression.LessThan(left, right);
case DbExpressionKind.LessThanOrEquals:
return Expression.LessThanOrEqual(left, right);
default:
throw new InvalidOperationException(
"The ExpressionKind cannot be " + kind.ToString());
}
}
private Tuple<int, bool> GetCompareMode(DbExpressionKind kind)
{
switch (kind)
{
case DbExpressionKind.Equals:
return Tuple.Create(0, true);
case DbExpressionKind.NotEquals:
return Tuple.Create(0, false);
case DbExpressionKind.GreaterThan:
return Tuple.Create(1, true);
case DbExpressionKind.GreaterThanOrEquals:
return Tuple.Create(-1, false);
case DbExpressionKind.LessThan:
return Tuple.Create(-1, true);
case DbExpressionKind.LessThanOrEquals:
return Tuple.Create(1, false);
}
throw new InvalidOperationException(
"The ExpressionKind cannot be " + kind.ToString());
}