43 lines
1.7 KiB
C#
43 lines
1.7 KiB
C#
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using System;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using SqlSugar;
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namespace JSMachine.WMS.Infrastructure.LambdaHelp
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{
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public static class OrderExpression
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{
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public static ISugarQueryable<T> OrderByLambda<T>(this ISugarQueryable<T> source, string property, OrderByType orderByType)
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{
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return ApplyOrder<T>(source, property, orderByType.ToString());
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}
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static ISugarQueryable<T> ApplyOrder<T>(ISugarQueryable<T> source, string property, string methodName)
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{
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string[] props = property.Split('.');
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Type type = typeof(T);
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ParameterExpression arg = Expression.Parameter(type, "x");
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Expression expr = arg;
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foreach (string prop in props)
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{
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// use reflection (not ComponentModel) to mirror LINQ
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PropertyInfo pi = type.GetProperty(prop);
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expr = Expression.Property(expr, pi);
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type = pi.PropertyType;
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}
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Type delegateType = typeof(Func<,>).MakeGenericType(typeof(T), type);
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LambdaExpression lambda = Expression.Lambda(delegateType, expr, arg);
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object result = typeof(Queryable).GetMethods().Single(
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method => method.Name == methodName
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&& method.IsGenericMethodDefinition
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&& method.GetGenericArguments().Length == 2
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&& method.GetParameters().Length == 2)
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.MakeGenericMethod(typeof(T), type)
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.Invoke(null, new object[] { source, lambda });
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return (ISugarQueryable<T>)result;
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}
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}
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}
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