30 lines
1.3 KiB
C#
30 lines
1.3 KiB
C#
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using System.Linq.Expressions;
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namespace ShardingCore.CommonTest;
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public static class QueryableExtension
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{
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public static IQueryable<T> CheckBetween<T, S>(this IQueryable<T> baseQuery, S? valMin,S? valMax,Expression<Func<T,S?>> field,bool includeMin=true,bool includeMax=true) where S : struct
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{
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if (valMin == null && valMax == null)
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{
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return baseQuery;
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}
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else
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{
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IQueryable<T> rv = baseQuery;
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if (valMin != null)
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{
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BinaryExpression exp1 = !includeMin ? Expression.GreaterThan(Expression.PropertyOrField(field.Body, "Value"), Expression.Constant(valMin)) : Expression.GreaterThanOrEqual(Expression.PropertyOrField(field.Body, "Value"), Expression.Constant(valMin));
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rv = rv.Where(Expression.Lambda<Func<T, bool>>(exp1, field.Parameters[0]));
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}
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if (valMax != null)
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{
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BinaryExpression exp2 = !includeMax ? Expression.LessThan(Expression.PropertyOrField(field.Body, "Value"), Expression.Constant(valMax)) : Expression.LessThanOrEqual(Expression.PropertyOrField(field.Body, "Value"), Expression.Constant(valMax));
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rv = rv.Where(Expression.Lambda<Func<T, bool>>(exp2, field.Parameters[0]));
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}
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return rv;
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}
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}
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}
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