wpf-visual-process-framework/LogicControl/DecisionNodeModel.cs

using System.Data;
using VisionFrame.Base;

namespace LogicControl
{
    public class DecisionNodeModel : DecisionNodeModelBase
    {
        public DecisionNodeModel()
        {
            // 某个变量值 == 什么值   >   <  >=   <=  !=   关系运算符
            // 
            this.Arguments.Add(new VisionFrame.Base.Models.NodeArgModel
            {
                ArgName = "判断目标",
                ArgType = "Any",
                Direction = "输入"
            });
            this.Arguments.Add(new VisionFrame.Base.Models.NodeArgModel
            {
                ArgName = "判断方式",
                ArgType = "String",
                Direction = "输入",
                ValueMode = 3
            });
            this.Arguments.Add(new VisionFrame.Base.Models.NodeArgModel
            {
                ArgName = "判断值",
                ArgType = "Any",
                Direction = "输入",
                ValueMode = 1
            });
        }
        public override bool Decision(IFlowContext context)
        {
            //int temp = 1;
            //return new DataTable().Compute("1<=2", "").ToString() == "True";

            if (this.Arguments[0].ArgValue == null)
                throw new Exception("判断目标参数未配置");
            if (this.Arguments[1].ArgValue == null)
                throw new Exception("判断方式参数未配置");
            if (this.Arguments[2].ArgValue == null)
                throw new Exception("判断值参数未配置");

            string org_value = "";
            var am = context.ArgumentList
               .FirstOrDefault(a => a.ArgName == this.Arguments[0].ArgValue.ToString());
            if (am != null)
                org_value = am.Value.ToString();

            string value = this.Arguments[2].ArgValue.ToString();
            if (this.Arguments[2].ValueMode == 0)
            {
                am = context.ArgumentList
                       .FirstOrDefault(a => a.ArgName == this.Arguments[0].ArgValue.ToString());
                if (am != null)
                    value = am.Value.ToString();
            }

            string compare = org_value + this.Arguments[1].ArgValue.ToString() + value;
            // "0x5235443==32432"
            // "1==2"
            return new DataTable().Compute(compare, "").ToString() == "True";
        }
    }

}