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+// Admin.NET 项目的版权、商标、专利和其他相关权利均受相应法律法规的保护。使用本项目应遵守相关法律法规和许可证的要求。
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+//
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+// 本项目主要遵循 MIT 许可证和 Apache 许可证（版本 2.0）进行分发和使用。许可证位于源代码树根目录中的 LICENSE-MIT 和 LICENSE-APACHE 文件。
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+//
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+// 不得利用本项目从事危害国家安全、扰乱社会秩序、侵犯他人合法权益等法律法规禁止的活动！任何基于本项目二次开发而产生的一切法律纠纷和责任，我们不承担任何责任！
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+
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+using System.Text.Json;
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+
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+namespace Admin.NET.Core;
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+
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+/// <summary>
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+/// Sqlsugar 动态查询扩展方法
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+/// </summary>
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+public static class SqlSugarExtension
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+{
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+ public static ISugarQueryable<T> SearchBy<T>(this ISugarQueryable<T> queryable,BaseFilter filter)
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+ {
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+ return queryable.SearchByKeyword(filter.Keyword)
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+ .AdvancedSearch(filter.Search)
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+ .AdvancedFilter(filter.Filter);
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+ }
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+
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+ public static ISugarQueryable<T> SearchByKeyword<T>(this ISugarQueryable<T> queryable,string keyword)
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+ {
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+ return queryable.AdvancedSearch(new Search { Keyword = keyword });
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+ }
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+
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+ public static ISugarQueryable<T> AdvancedSearch<T>(this ISugarQueryable<T> queryable,Search search)
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+ {
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+ if (!string.IsNullOrWhiteSpace(search?.Keyword))
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+ {
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+ var paramExpr = Expression.Parameter(typeof(T));
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+
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+ Expression right = Expression.Constant(false);
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+
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+ if (search.Fields?.Any() is true)
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+ {
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+ foreach (string field in search.Fields)
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+ {
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+ MemberExpression propertyExpr = GetPropertyExpression(field, paramExpr);
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+
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+ var left = AddSearchPropertyByKeyword<T>(propertyExpr, search.Keyword);
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+
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+ right = Expression.Or(left, right);
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+ }
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+ }
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+ else
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+ {
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+ var properties = typeof(T).GetProperties()
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+ .Where(prop => Nullable.GetUnderlyingType(prop.PropertyType) == null
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+ && !prop.PropertyType.IsEnum
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+ && Type.GetTypeCode(prop.PropertyType) != TypeCode.Object);
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+
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+ foreach (var property in properties)
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+ {
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+ var propertyExpr = Expression.Property(paramExpr, property);
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+
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+ var left = AddSearchPropertyByKeyword<T>(propertyExpr, search.Keyword);
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+
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+ right = Expression.Or(left, right);
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+ }
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+ }
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+
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+ var lambda = Expression.Lambda<Func<T, bool>>(right, paramExpr);
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+
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+ return queryable.Where(lambda);
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+ }
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+
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+ return queryable;
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+ }
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+
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+ public static ISugarQueryable<T> AdvancedFilter<T>(this ISugarQueryable<T> queryable,Filter filter)
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+ {
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+ if(filter is not null)
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+ {
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+ var parameter = Expression.Parameter(typeof(T));
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+
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+ Expression binaryExpresioFilter;
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+
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+ if (filter.Logic.HasValue)
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+ {
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+ if (filter.Filters is null) throw new ArgumentException("The Filters attribute is required when declaring a logic");
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+ binaryExpresioFilter = CreateFilterExpression(filter.Logic.Value, filter.Filters, parameter);
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+ }
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+ else
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+ {
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+ var filterValid = GetValidFilter(filter);
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+ binaryExpresioFilter = CreateFilterExpression(filterValid.Field!, filterValid.Operator.Value, filterValid.Value, parameter);
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+ }
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+
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+ var lambda = Expression.Lambda<Func<T, bool>>(binaryExpresioFilter, parameter);
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+
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+ return queryable.Where(lambda);
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+ }
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+ return queryable;
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+ }
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+
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+ private static Expression CombineFilter(
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+ FilterLogicEnum filterLogic,
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+ Expression bExpresionBase,
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+ Expression bExpresion)
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+ {
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+ return filterLogic switch
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+ {
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+ FilterLogicEnum.And => Expression.And(bExpresionBase, bExpresion),
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+ FilterLogicEnum.Or => Expression.Or(bExpresionBase, bExpresion),
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+ FilterLogicEnum.Xor => Expression.ExclusiveOr(bExpresionBase, bExpresion),
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+ _ => throw new ArgumentException("FilterLogic is not valid.", nameof(filterLogic)),
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+ };
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+ }
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+
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+ private static Filter GetValidFilter(Filter filter)
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+ {
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+ if (string.IsNullOrEmpty(filter.Field)) throw new ArgumentException("The field attribute is required when declaring a filter");
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+ if (filter.Operator.IsNullOrEmpty()) throw new ArgumentException("The Operator attribute is required when declaring a filter");
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+ return filter;
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+ }
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+
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+
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+ private static Expression CreateFilterExpression(
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+ FilterLogicEnum filterLogic,
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+ IEnumerable<Filter> filters,
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+ ParameterExpression parameter)
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+ {
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+ Expression filterExpression = default!;
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+
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+ foreach (var filter in filters)
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+ {
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+ Expression bExpresionFilter;
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+
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+ if (filter.Logic.HasValue)
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+ {
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+ if (filter.Filters is null) throw new ArgumentException("The Filters attribute is required when declaring a logic");
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+ bExpresionFilter = CreateFilterExpression(filter.Logic.Value, filter.Filters, parameter);
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+ }
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+ else
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+ {
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+ var filterValid = GetValidFilter(filter);
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+ bExpresionFilter = CreateFilterExpression(filterValid.Field!, filterValid.Operator.Value, filterValid.Value, parameter);
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+ }
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+
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+ filterExpression = filterExpression is null ? bExpresionFilter : CombineFilter(filterLogic, filterExpression, bExpresionFilter);
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+ }
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+
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+ return filterExpression;
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+ }
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+
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+ private static Expression CreateFilterExpression(
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+ string field,
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+ FilterOperatorEnum filterOperator,
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+ object? value,
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+ ParameterExpression parameter)
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+ {
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+ var propertyExpresion = GetPropertyExpression(field, parameter);
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+ var valueExpresion = GeValuetExpression(field, value, propertyExpresion.Type);
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+ return CreateFilterExpression(propertyExpresion, valueExpresion, filterOperator);
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+ }
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+
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+ private static Expression CreateFilterExpression(
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+ MemberExpression memberExpression,
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+ ConstantExpression constantExpression,
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+ FilterOperatorEnum filterOperator)
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+ {
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+ return filterOperator switch
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+ {
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+ FilterOperatorEnum.EQ => Expression.Equal(memberExpression, constantExpression),
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+ FilterOperatorEnum.NEQ => Expression.NotEqual(memberExpression, constantExpression),
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+ FilterOperatorEnum.LT => Expression.LessThan(memberExpression, constantExpression),
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+ FilterOperatorEnum.LTE => Expression.LessThanOrEqual(memberExpression, constantExpression),
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+ FilterOperatorEnum.GT => Expression.GreaterThan(memberExpression, constantExpression),
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+ FilterOperatorEnum.GTE => Expression.GreaterThanOrEqual(memberExpression, constantExpression),
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+ FilterOperatorEnum.Contains => Expression.Call(memberExpression,nameof(FilterOperatorEnum.Contains), null, constantExpression),
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+ FilterOperatorEnum.StartsWith => Expression.Call(memberExpression, nameof(FilterOperatorEnum.StartsWith), null, constantExpression),
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+ FilterOperatorEnum.EndsWith => Expression.Call(memberExpression, nameof(FilterOperatorEnum.EndsWith), null, constantExpression),
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+ _ => throw new ArgumentException("Filter Operator is not valid."),
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+ };
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+ }
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+
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+ private static string GetStringFromJsonElement(object value)
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+ {
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+ if (value is JsonElement) return ((JsonElement)value).GetString()!;
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+ if (value is string) return (string)value;
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+ return value?.ToString();
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+ }
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+
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+
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+ private static ConstantExpression GeValuetExpression(
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+ string field,
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+ object? value,
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+ Type propertyType)
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+ {
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+ if (value == null) return Expression.Constant(null, propertyType);
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+
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+ if (propertyType.IsEnum)
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+ {
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+ string? stringEnum = GetStringFromJsonElement(value);
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+
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+ if (!Enum.TryParse(propertyType, stringEnum, true, out object? valueparsed)) throw new ArgumentException(string.Format("Value {0} is not valid for {1}", value, field));
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+
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+ return Expression.Constant(valueparsed, propertyType);
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+ }
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+ if(propertyType == typeof(long))
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+ {
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+ string? stringLong = GetStringFromJsonElement(value);
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+
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+ if (!long.TryParse(stringLong, out long valueparsed)) throw new ArgumentException(string.Format("Value {0} is not valid for {1}", value, field));
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+
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+ return Expression.Constant(valueparsed, propertyType);
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+ }
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+
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+ if (propertyType == typeof(Guid))
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+ {
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+ string? stringGuid = GetStringFromJsonElement(value);
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+
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+ if (!Guid.TryParse(stringGuid, out Guid valueparsed)) throw new ArgumentException(string.Format("Value {0} is not valid for {1}", value, field));
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+
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+ return Expression.Constant(valueparsed, propertyType);
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+ }
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+
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+ if (propertyType == typeof(string))
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+ {
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+ string? text = GetStringFromJsonElement(value);
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+
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+ return Expression.Constant(text, propertyType);
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+ }
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+
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+ if (propertyType == typeof(DateTime) || propertyType == typeof(DateTime?))
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+ {
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+ string? text = GetStringFromJsonElement(value);
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+ return Expression.Constant(ChangeType(text, propertyType), propertyType);
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+ }
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+
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+ return Expression.Constant(ChangeType(((JsonElement)value).GetRawText(), propertyType), propertyType);
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+ }
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+
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+ private static dynamic? ChangeType(object value, Type conversion)
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+ {
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+ var t = conversion;
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+
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+ if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
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+ {
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+ if (value == null)
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+ {
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+ return null;
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+ }
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+
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+ t = Nullable.GetUnderlyingType(t);
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+ }
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+
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+ return Convert.ChangeType(value, t!);
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+ }
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+
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+ private static MemberExpression GetPropertyExpression(
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+ string propertyName,
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+ ParameterExpression parameter)
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+ {
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+ Expression propertyExpression = parameter;
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+ foreach (string member in propertyName.Split('.'))
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+ {
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+ propertyExpression = Expression.PropertyOrField(propertyExpression, member);
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+ }
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+
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+ return (MemberExpression)propertyExpression;
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+ }
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+
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+ private static Expression AddSearchPropertyByKeyword<T>(
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+ Expression propertyExpr,
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+ string keyword,
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+ FilterOperatorEnum operatorSearch = FilterOperatorEnum.Contains)
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+ {
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+ if (propertyExpr is not MemberExpression memberExpr || memberExpr.Member is not PropertyInfo property)
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+ {
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+ throw new ArgumentException("propertyExpr must be a property expression.", nameof(propertyExpr));
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+ }
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+
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+ ConstantExpression constant = Expression.Constant(keyword);
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+
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+ MethodInfo method = operatorSearch switch
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+ {
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+ FilterOperatorEnum.Contains => typeof(string).GetMethod(nameof(FilterOperatorEnum.Contains), new Type[] { typeof(string) }),
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+ FilterOperatorEnum.StartsWith => typeof(string).GetMethod(nameof(FilterOperatorEnum.StartsWith), new Type[] { typeof(string) }),
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+ FilterOperatorEnum.EndsWith => typeof(string).GetMethod(nameof(FilterOperatorEnum.EndsWith), new Type[] { typeof(string) }),
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+ _ => throw new ArgumentException("Filter Operator is not valid."),
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+ };
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+
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+ Expression selectorExpr =
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+ property.PropertyType == typeof(string)
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+ ? propertyExpr
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+ : Expression.Condition(
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+ Expression.Equal(Expression.Convert(propertyExpr, typeof(object)), Expression.Constant(null, typeof(object))),
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+ Expression.Constant(null, typeof(string)),
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+ Expression.Call(propertyExpr, "ToString", null, null));
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+
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+ return Expression.Call(selectorExpr, method, constant);
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+ }
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+}
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yorkove