Dynamics 365中自定义工作流活动获取的上下文分析及注意事项

using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
using Microsoft.Xrm.Sdk.Workflow;
using Microsoft.Xrm.Sdk;
using System.Reflection;

namespace CrmVSSolution.Workflow
{
    public sealed class PostTestUpdate : CodeActivity
    {
        protected override void Execute(CodeActivityContext executionContext)
        {
            ITracingService tracingService = executionContext.GetExtension<ITracingService>();
            tracingService.Trace("进入自定义工作流活动CrmVSSolution.Workflow.PostTestUpdate");
            IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
            IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
            IOrganizationService orgService = serviceFactory.CreateOrganizationService(context.UserId);
            StringBuilder sb = new StringBuilder();
            PropertyInfo[] properties = context.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
            foreach (PropertyInfo proInfo in properties)
            {
                sb.Append(proInfo.Name);
                sb.Append(" = ");
                if (proInfo.CanRead)
                {
                    sb.Append(proInfo.GetValue(context, null));
                }
                else
                {
                    sb.Append("Cannot read value");
                }
                sb.Append("(");
                sb.Append(proInfo.PropertyType.ToString());
                sb.Append(");");
                sb.Append("\n");
            }
            tracingService.Trace("工作流中context的所有参数如下:\n");
            tracingService.Trace(sb.ToString());
            sb.Clear();
            foreach(var item in context.InputParameters)
            {
                sb.Append(item.Key);
                sb.Append(" = ");
                if (item.Value != null)//注意有的属性的值为null，比如InputArguments
                {
                    sb.Append(item.Value.ToString());
                }
                else
                {
                    sb.Append("null");
                }
                sb.Append("\n");
            }
            tracingService.Trace("工作流中context.InputParameter的参数如下:\n");
            tracingService.Trace(sb.ToString());
            sb.Clear();
            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
            {
                sb.Append("工作流中包括了Target参数，它是Entity类型.\n");
                var currentEntity = context.InputParameters["Target"] as Entity;
                sb.Append("Target参数包括如下属性:\n");
                foreach (var attr in currentEntity.Attributes)
                {
                    sb.Append(attr.Key);
                    sb.Append(" = ");
                    if (attr.Value != null)//注意有的属性值为null，比如modifiedonbehalfby，所以要加上判断
                    {
                        sb.Append(attr.Value.ToString());
                    }
                    else
                    {
                        sb.Append("null");
                    }
                    sb.Append("\n");
                }
                tracingService.Trace(sb.ToString());
            }
            tracingService.Trace("结束自定义工作流活动CrmVSSolution.Workflow.PostTestUpdate");
            throw new InvalidWorkflowException("有时候不抛出异常不行啊！");
        }
    }
}