溪客(编程代码)

判定规则是匹配失败还是匹配异常

当RulesEngine进行规则匹配的是，不论是失败还是异常，IsSuccess都为false，且都不抛出异常

• 失败：指规则不匹配
• 异常：指给到的参数或者规则本身出异常

看下结果类

public class RuleResultTree
{
    public Rule Rule { get; set; }
    public bool IsSuccess { get; set; }
    public IEnumerable<RuleResultTree> ChildResults { get; set; }
    public Dictionary<string, object> Inputs { get; set; }
    public ActionResult ActionResult { get; set; }
    public string ExceptionMessage { get; set; }
}

这里可以通过ExceptionMessage是否有值来判定是否是异常

不要使用 Dictionary<string,object>

Exception while parsing expression `customer.HalfYearOrders > 3` -The binary operator GreaterThan is not defined for the types 'System.Object' and 'System.Int32'.

如上所示，会提示无法比较

建议：

如果类型是确定的，使用类对象或者匿名对象

var data = new { Name: "张三"};

如果不确定的，使用ExpandoObject

IDictionary<string, object> data = new System.Dynamic.ExpandoObject();

dapper 动态数据的使用

使用dapper查出dynamic数据，如下代码

dynamic obj = db.QuerySingle("ZJX_usp_xx", new { cardNo = CardNo }, commandType: System.Data.CommandType.StoredProcedure);

如果将obj直接用于param，将提示如下错误

var engine= new RulesEngine.RulesEngine(workflowRules);
var workflowParam = new RulesEngine.Models.RuleParameter("customer", obj);
var resultList = await engine.ExecuteAllRulesAsync('workflowName', workflowParam); 

这里 resultList 会提示

Exception while parsing expression `customer.HalfYearOrders>3` - No property or field 'HalfYearOrders' exists in type 'DapperRow'

解决办法是将dynamic数据取出来放在ExpandoObject中，然后再用

IDictionary<string, object> dapperRowProperties = obj as IDictionary<string, object>;
IDictionary<string, object> expando = new System.Dynamic.ExpandoObject();
foreach (KeyValuePair<string, object> property in dapperRowProperties)
   expando.Add(property.Key, property.Value);
                
var engine= new RulesEngine.RulesEngine(workflowRules);
var workflowParam = new RulesEngine.Models.RuleParameter("customer", obj);
var resultList = await engine.ExecuteAllRulesAsync('workflowName', expando); // 注意这里，使用转换过的