NetCore DynamicExpresso 动态表达式使用例子

Simple.cs 简单使用例子

using DynamicExpresso;namespace DynamicExpressoDemo
{class Customer { public string Name { get; set; } }public class Simple{public static void Test(){// 返回结果Interpreter target1 = new Interpreter();double result1 = target1.Eval<double>("Math.Min(x, y) + 5", new Parameter("x", typeof(double), 1), new Parameter("y", typeof(double), 2));Console.WriteLine($"result:{result1}");// 输出:6// 定义变量并赋值var target2 = new Interpreter().SetVariable("myVar", 23);var result2 = target2.Eval("myVar + 10");Console.WriteLine($"result:{result2}");// 输出：33// 动态参数var target3 = new Interpreter();var parameters = new[] { new Parameter("x", 23), new Parameter("y", 7) };var result3 = target3.Eval("x + y", parameters);Console.WriteLine($"result:{result3}");// 输出：30var target = new Interpreter();target.SetVariable("a", new Customer { Name = "AA" });target.SetVariable("b", new Customer { Name = "BB" });Console.WriteLine(target.Eval("a.Name"));// 输出：AAConsole.WriteLine(target.Eval("b.Name")); // 输出：BB}}
}

QueryMemoryData.cs 查询内存数据例子

using DynamicExpresso;namespace DynamicExpressoDemo
{class Trade{public int TradeID { get; set; }public string TradeTitle { get; set; }public DateTime Created { get; set; }public int CustomerID { get; set; }}public class QueryMemoryData{static Interpreter interpreter = new Interpreter();public static void Filter(){var tradeList = new List<Trade>(){new Trade() { TradeID = 1, TradeTitle = "交易1", Created = Convert.ToDateTime("2020/8/1"), CustomerID = 1 },new Trade() { TradeID = 2, TradeTitle = "交易2", Created = Convert.ToDateTime("2020/8/5"), CustomerID = 2 },new Trade() { TradeID = 3, TradeTitle = "交易3", Created = Convert.ToDateTime("2020/8/10"), CustomerID = 3 }};// 查询内存值string whereExpression = "(trade.CustomerID == 1 || trade.CustomerID == 2 || trade.CustomerID == 10) && trade.Created <= Convert.ToDateTime(\"2020-08-20\")"; Func<Trade, bool> queryFunc = interpreter.ParseAsDelegate<Func<Trade, bool>>(whereExpression, "trade"); var list = tradeList.Where(queryFunc).ToList();// list + DynamicExpressoforeach (var a in list){a.TradeTitle = a.TradeTitle + "_update";// 更新内存值Console.WriteLine(a.ToString());}}}
}