/// <summary>
/// 根据放入AutoModelFilterDict的字段（要指定排序功能）自动生成一个对应的ModelSorter用于Sort排序，若SortRuleDict中没有规则，则返回null
/// </summary>
/// <returns></returns>
public Comparison <T> GetModelSorter()
{
if (ModelSortRuleDict.IsNullOrEmptySet())
{
return(null);
}
return(delegate(T modelX, T modelY)
{
int result = 0; //1,-1,0分别是大，小，相等，默认升序
Dictionary <string, KeyValuePair <Type, object> > modelxInfoDict = ReflectionTool.GetAllPropertyInfo <T>(modelX); //获取一个model字段的信息
foreach (var modelProperty in modelxInfoDict)
{
string fieldName = modelProperty.Key;
Type type = modelProperty.Value.Key;
if (ModelSortRuleDict.TryGetValue(fieldName, out KeyValuePair <int, bool> rule) && typeof(IComparable).IsAssignableFrom(type)) //若该字段有排序规则且实现了Comparable接口
{
var xValue = modelProperty.Value.Value; //原始字段值
var yValue = typeof(T).GetProperty(fieldName)?.GetValue(modelY); //要比较的字段值
int weight = rule.Key; //该字段排序权重
if (rule.Value)
{
weight = -weight; //若该字段是降序则权重相反
}
weight *= ((IComparable)xValue).CompareTo(yValue);
result += weight;
}
}
return result;
});
}
//Func<T, object, bool> func = (modelInstance, comparePair) => 的lamada表达式被简化为了本地函数
static bool func(T modelInstance, object comparePair)
{
bool result = true;
Dictionary <string, KeyValuePair <object, FilterType> > list = (Dictionary <string, KeyValuePair <object, FilterType> >)comparePair;//[Key属性名 Value[Key属性值,Value过滤类型]]
Dictionary <string, KeyValuePair <Type, object> > propertyInfoDict = ReflectionTool.GetAllPropertyInfo <T>(modelInstance);
if (propertyInfoDict.IsNullOrEmptySet() || comparePair == null)
{
return(true); //没东西就不用过滤了
}
foreach (var contrastPair in list)
{
var pair = contrastPair.Value;
if (propertyInfoDict.TryGetValue(contrastPair.Key, out KeyValuePair <Type, object> originPair))
{
Type propertyType = originPair.Key;
object propertyValue = originPair.Value;
object contrast = pair.Key;
FilterType filterType = pair.Value;
var origin = propertyValue;//原始字段值
//当Str类型支持Empty值时符合则匹配
if (filterType.HasFlag(FilterType.SupportStrEmpty) && contrast is string && origin is string && ((string)contrast).IsNullOrEmpty() && ((string)origin).IsNullOrEmpty())
{
continue;
}
//原始值是空的不匹配，除非支持null值匹配
if (!filterType.HasFlag(FilterType.SupportNull) && origin == null)
{
return(false);
}
//原始值是值类型且是默认值的不匹配，除非支持默认值
if (origin is ValueType && !filterType.HasFlag(FilterType.SupportValueDefault) && origin.Equals(Activator.CreateInstance(propertyType)))
{
return(false);
}
//比较值为空的匹配，因为没有做限制，除非支持null认为null也是限制
if (!filterType.HasFlag(FilterType.SupportNull) && contrast == null)
{
continue;
}
//当仅过滤空值、默认值时直接匹配（因为前面已经过滤掉了）
if (filterType.HasFlag(FilterType.OnlyFilterNull))
{
continue;
}
if (origin is string) //类型是string的
{
string ori = (string)origin;
if (ori == string.Empty && !filterType.HasFlag(FilterType.SupportStrEmpty))
{
return(false);
}
string con = (string)contrast;
switch (filterType)
{
case var _ when filterType.HasFlag(FilterType.Exact): //C#7.0特性 case的when约束，要true才会成功case
case FilterType.Exact:
result &= ori.Equals(con);
break;
case FilterType.IgnoreCase:
result &= ori.Equals(con, StringComparison.OrdinalIgnoreCase);
break;
case FilterType.Fuzzy:
result &= ori.Trim().Contains(con.Trim());
break;
case FilterType.FuzzyIgnoreCase:
result &= ori.ToLower().Trim().Contains(con.ToLower().Trim());
break;
case FilterType.Interval: //转为闭区间类型
result &= ori.TryGetInterval(out double left, out double right, true) &&
con.TryGetInterval(out double conleft, out double conright, true) &&
(conleft <= left && right <= conright);
break;
default:
goto case FilterType.FuzzyIgnoreCase;
}
}
else if (origin is double || origin is int && contrast is string)//数值型支持区间表示
{
double ori = System.Convert.ToDouble(origin);
string con = (string)contrast;
if (ZhNumber.IsContainZhNumber(con))
{
con = ZhNumber.ToArabicNumber(con);
}
if (double.TryParse(con, out double num))//直接精确等于
{
result &= num == ori;
}
else if (con.TryGetInterval(out IntervalDouble left, out IntervalDouble right))//区间表示
{
if (!(ori >= left && ori <= right))
{
return(false);
}
}
else
{
return(false);//无法转换则不匹配
}
}
else if (origin is Enum)//支持枚举类过滤
{
if (contrast is string con)
{
result &= Enum.Parse(propertyType, con).Equals(origin);
}
else
{
result &= contrast.Equals(origin);
}
}
else if (origin is TimeSpan span && contrast is string con)//支持TimeSpan区间型过滤
{
if (con.TryGetTimeSpan(out TimeSpan timeSpan))
{
if (timeSpan != span)
{
return(false);
}
}
else if (con.TryGetTimeSpanInterval(out TimeSpan left, out TimeSpan right))
{
if (!(span >= left && span <= right))
{
return(false); //不在区间内
}
}
else//尝试古代时间、现代时间以及中文计数法
{
var interval = Regex.Split(con, "(到|[-~,])+");
string rightCon = "";//尝试是否存在第二个以构成区间
bool isRightExist = false;
if (interval.Length >= 3)
{
con = interval[0];
rightCon = interval[2];
isRightExist = true;
}
TimeSpan zhTimeSpan = new TimeSpan();
bool success = KouStringTool.TryToTimeSpan(con, out zhTimeSpan);
if (success && isRightExist)//如果左边成功了尝试是否有第二个构成区间
{
TimeSpan zhTimeSpanRight = new TimeSpan();
bool successRight = KouStringTool.TryToTimeSpan(rightCon, out zhTimeSpanRight);
if (!successRight || zhTimeSpan > zhTimeSpanRight || span < zhTimeSpan || span > zhTimeSpanRight)
{
return(false); //原时间间隔不在区间内的不匹配
}
}
else if (!success || zhTimeSpan != span)
{
return(false); //时间与原时间间隔的不一致的不匹配
}
}
}
else//其他类型直接比较是否相等
{
contrast = System.Convert.ChangeType(contrast, propertyType);
result &= contrast.Equals(origin);
}
if (result == false)
{
return(false);
}
}
}