first commit

2026-09-02 16:31:50 +08:00
commit a461727193
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+using System;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Reflection;
+using SqlSugar;
+
+namespace JSMachine.WMS.Infrastructure.LambdaHelp
+{
+    public static class OrderExpression
+    {
+        public static ISugarQueryable<T> OrderByLambda<T>(this ISugarQueryable<T> source, string property, OrderByType orderByType)
+        {
+            return ApplyOrder<T>(source, property, orderByType.ToString());
+        }
+
+        static ISugarQueryable<T> ApplyOrder<T>(ISugarQueryable<T> source, string property, string methodName)
+        {
+            string[] props = property.Split('.');
+            Type type = typeof(T);
+            ParameterExpression arg = Expression.Parameter(type, "x");
+            Expression expr = arg;
+            foreach (string prop in props)
+            {
+                // use reflection (not ComponentModel) to mirror LINQ
+                PropertyInfo pi = type.GetProperty(prop);
+                expr = Expression.Property(expr, pi);
+                type = pi.PropertyType;
+            }
+            Type delegateType = typeof(Func<,>).MakeGenericType(typeof(T), type);
+            LambdaExpression lambda = Expression.Lambda(delegateType, expr, arg);
+
+            object result = typeof(Queryable).GetMethods().Single(
+                    method => method.Name == methodName
+                            && method.IsGenericMethodDefinition
+                            && method.GetGenericArguments().Length == 2
+                            && method.GetParameters().Length == 2)
+                    .MakeGenericMethod(typeof(T), type)
+                    .Invoke(null, new object[] { source, lambda });
+            return (ISugarQueryable<T>)result;
+        }
+    }
+}