/// <summary>
/// 当前表达式是否能与指定表达式合并
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public virtual bool CanCombine(ExpressionBase expression)
{
return(expression == null);
}
public override bool CanCombine(ExpressionBase expression)
{
return(expression == null || expression is TextConstantExpression);
}