Question

我担心的另一个MS CRM问题，我很害怕。我在更新联系人记录时执行了以下代码，但是它给出了一个错误，说明作业被取消，因为它包含无限循环。谁能告诉我为什么会这样呢？

// <copyright file="PostContactUpdate.cs" company="">
// Copyright (c) 2013 All Rights Reserved
// </copyright>
// <author></author>
// <date>8/7/2013 2:04:26 PM</date>
// <summary>Implements the PostContactUpdate Plugin.</summary>
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:4.0.30319.1
// </auto-generated>
namespace Plugins3Test
{
    using System;
    using System.ServiceModel;
    using Microsoft.Xrm.Sdk;
    using Microsoft.Xrm.Sdk.Query;

    /// <summary>
    /// PostContactUpdate Plugin.
    /// Fires when the following attributes are updated:
    /// All Attributes
    /// </summary>    
    public class PostContactUpdate: Plugin
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="PostContactUpdate"/> class.
        /// </summary>
        public PostContactUpdate()
            : base(typeof(PostContactUpdate))
        {
            base.RegisteredEvents.Add(new Tuple<int, string, string, Action<LocalPluginContext>>(40, "Update", "contact", new Action<LocalPluginContext>(ExecutePostContactUpdate)));

            // Note : you can register for more events here if this plugin is not specific to an individual entity and message combination.
            // You may also need to update your RegisterFile.crmregister plug-in registration file to reflect any change.
        }

        /// <summary>
        /// Executes the plug-in.
        /// </summary>
        /// <param name="localContext">The <see cref="LocalPluginContext"/> which contains the
        /// <see cref="IPluginExecutionContext"/>,
        /// <see cref="IOrganizationService"/>
        /// and <see cref="ITracingService"/>
        /// </param>
        /// <remarks>
        /// For improved performance, Microsoft Dynamics CRM caches plug-in instances.
        /// The plug-in's Execute method should be written to be stateless as the constructor
        /// is not called for every invocation of the plug-in. Also, multiple system threads
        /// could execute the plug-in at the same time. All per invocation state information
        /// is stored in the context. This means that you should not use global variables in plug-ins.
        /// </remarks>
        protected void ExecutePostContactUpdate(LocalPluginContext localContext)
        {
            if (localContext == null)
            {
                throw new ArgumentNullException("localContext");
            }

            // TODO: Implement your custom Plug-in business logic.

            // Obtain the execution context from the service provider.
            IPluginExecutionContext context = localContext.PluginExecutionContext;
            IOrganizationService service = localContext.OrganizationService;
            IServiceProvider serviceProvider = localContext.ServiceProvider;
            ITracingService tracingService = localContext.TracingService;


            // Obtain the target entity from the input parmameters.
            //Entity contextEntity = (Entity)context.InputParameters["Target"];




                Entity targetEntity = null;
                targetEntity = (Entity)context.InputParameters["Target"];
                Guid cid = targetEntity.Id;
                ColumnSet cols = new ColumnSet("jobtitle");

                Entity contact = service.Retrieve("contact", cid, cols);
                contact.Attributes["jobtitle"] = "Sometitle";
                service.Update(contact);





        }
    }
}

Answer 1

它正在发生，因为你的插件是在更新联系人并且代码的最后一行再次更新联系人时执行的，这导致再次调用插件......

然后你有无限循环

您可以使用IExecutionContext.Depth属性

来阻止循环

http://msdn.microsoft.com/en-us/library/microsoft.xrm.sdk.iexecutioncontext.depth.aspx

但是，如果您解释您的要求，我认为可以找到解决方案。

Answer 2

首先if IExecutionContext.Depth <= 1似乎是一个好主意，但如果你有一个更新联系人的不同插件，它会咬你。您应该使用插件上下文的SharedVariables。

这样的事情应该有效：

将此声明作为类级别字段添加到插件类中：

public static readonly Guid HasRunKey = new Guid("{6339dc20-01ce-4f2f-b4a1-0a1285b65bff}");

并将其添加为插件的第一步：

if(context.SharedVariables.ContainsKey[HasRunKey]){
    return;
}else{
    context.SharedVariables.Add(HasRunKey);
    // Proceed with plugin execution
}

Answer 3

**我经历了大量的反复试验。我不知道为什么插件上下文不起作用但这有效，但是parentcontext有效。这（解决方法？）工作:) **

＆＃13;

            if (this.Context.ParentContext != null && this.Context.ParentContext.ParentContext != null)
            {
                var assemblyName = Assembly.GetExecutingAssembly().GetName().Name;

                if (!this.Context.ParentContext.ParentContext.SharedVariables.Contains(assemblyName))
                {
                    this.Context.ParentContext.ParentContext.SharedVariables.Add(assemblyName, true.ToString() );
                }
                else
                {
                   // isRecursive = true;
                  return;
                }
            }

＆＃13;

Answer 4

您的插件正在更新“jobtitle”字段，我不确定此插件是否被所有联系人更新触发，或者您已在Registerfile.crmregister插件的定义中为其设置了一些FilteringAttributes。通过从触发此插件的属性中排除“jobtitle”字段，您可以解决问题。

Microsoft CRM插件无限循环

4 个答案: