添加项目文件。

Common/Tool/ExpressionEvaluator.cs

@@ -0,0 +1,104 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using NCalc;
+
+namespace Common.Tools
+{
+    public class ExpressionEvaluator
+    {
+        public static bool EvaluateExpression(string expression, Dictionary<string, object>? variables = null)
+        {
+            try
+            {
+                // 预处理：替换中文变量名为英文别名
+                var (processedExpression, processedVariables) = PreprocessExpression(expression, variables);
+
+                var expr = new Expression(processedExpression, EvaluateOptions.IgnoreCase);
+
+                if (processedVariables != null)
+                {
+                    foreach (var kvp in processedVariables)
+                    {
+                        expr.Parameters[kvp.Key] = kvp.Value;
+                    }
+                }
+
+                if (expr.HasErrors())
+                {
+                    throw new ArgumentException($"条件表达式格式错误: {expr.Error}");
+                }
+
+                var result = expr.Evaluate();
+                return Convert.ToBoolean(result);
+            }
+            catch (Exception ex)
+            {
+                throw new ArgumentException($"条件表达式异常: {ex.Message}");
+            }
+        }
+
+        private static (string, Dictionary<string, object>) PreprocessExpression(
+            string expression,
+            Dictionary<string, object>? variables)
+        {
+            if (variables == null || variables.Count == 0)
+                return (expression, variables ?? new Dictionary<string, object>());
+
+            // 生成变量名映射 (中文 -> 英文别名)
+            var chineseToAlias = new Dictionary<string, string>();
+            var aliasToValue = new Dictionary<string, object>();
+            int counter = 1;
+
+            foreach (var key in variables.Keys)
+            {
+                if (ContainsChinese(key))
+                {
+                    string alias = $"var_{counter}";
+                    counter++;
+                    chineseToAlias[key] = alias;
+                    aliasToValue[alias] = variables[key];
+                }
+            }
+
+            // 如果没有中文变量名，直接返回原始数据
+            if (chineseToAlias.Count == 0)
+                return (expression, variables);
+
+            // 替换表达式中的中文变量名
+            string processedExpression = expression;
+            foreach (var pair in chineseToAlias)
+            {
+                // 使用正则确保完整匹配变量名
+                string pattern = $@"\b{Regex.Escape(pair.Key)}\b";
+                processedExpression = Regex.Replace(
+                    processedExpression,
+                    pattern,
+                    pair.Value,
+                    RegexOptions.Compiled
+                );
+            }
+
+            // 创建新变量字典（英文别名 + 原始英文变量）
+            var newVariables = new Dictionary<string, object>(aliasToValue);
+            foreach (var key in variables.Keys)
+            {
+                if (!ContainsChinese(key))
+                {
+                    newVariables[key] = variables[key];
+                }
+            }
+
+            return (processedExpression, newVariables);
+        }
+
+        // 检查字符串是否包含中文字符
+        private static bool ContainsChinese(string text)
+        {
+            return text.Any(c => c >= 0x4E00 && c <= 0x9FFF);
+        }
+    }
+}