为什么CRM 2011实体关系无效在这个插件code？ [英] Why is CRM 2011 Entity Relationship null in this plugin code?
问题描述
这是为CRM 2011，我创建的插件注册工具为这个插件的一个创建的步骤，我已经写了一个插件的工作示例。这执行罚款。我也注册了一个插件'更新'的一步。这种无法执行，因为返回的主要联系人为空。这些步骤都注册为异步的。
使用系统;
使用System.Collections.Generic;
使用System.Linq的;
使用System.Text;
使用Microsoft.Xrm.Sdk;
使用System.ServiceModel;
使用System.IO;
使用System.Net;
命名空间CRMNewsletterPlugin
{
公共类NewsletterSignup：IPlugin
{
公共无效执行（的IServiceProvider的ServiceProvider）
{
ITracingService tracingService =（ITracingService）serviceProvider.GetService（typeof运算（ITracingService））;
//获取来自服务提供商的执行上下文。
IPluginExecutionContext上下文=（IPluginExecutionContext）
serviceProvider.GetService（typeof运算（IPluginExecutionContext））;
tracingService.Trace（开始加载）;
//该InputParameters集合包含了所有的消息请求传递的数据。
如果（context.InputParameters.Contains（目标）及和放大器;
context.InputParameters [目标]是实体）
{
tracingService.Trace（我们有一个目标。）;
//获取从输入parmameters目标实体。
实体实体=（实体）context.InputParameters [目标];
IOrganizationServiceFactory服务工厂=（IOrganizationServiceFactory）serviceProvider.GetService（typeof运算（IOrganizationServiceFactory））;
IOrganizationService服务= serviceFactory.CreateOrganizationService（context.UserId）;
如果（entity.GetAttributeValue＆所述;！布尔＆GT（new_receivesnewsletter））
{
尝试
{
//检查账号存在
字符串EMAILADDRESS = entity.GetAttributeValue＆LT;字符串＆GT;（emailaddress1）;
的EntityReference primaryContact = entity.GetAttributeValue＆其中;的EntityReference＆GT（primarycontactid）;
//更新步骤失败HERE
如果（primaryContact == NULL）
{
tracingService.Trace（主要联系人为空）;
}
实体接触= service.Retrieve（接触，primaryContact.Id，新Microsoft.Xrm.Sdk.Query.ColumnSet（新的String [] {全名}））;
字符串全称= contact.GetAttributeValue＆LT;字符串＆GT;（全名）;
字符串名称= entity.GetAttributeValue＆LT;字符串＆GT;（姓名）;
WebRequest的REQ = WebRequest.Create（HTTP：// localhost的）;
字符串POSTDATA =CM-NAME =+真实姓名+＆放大器; CM-ddurhy-ddurhy =+ EMAILADDRESS +＆放大器; CM-F-jddkju =+名;
tracingService.Trace（POSTDATA）;
byte []的发送= Encoding.Default.GetBytes（POSTDATA）;
req.Method =POST;
req.ContentType =应用/的X WWW的形式urlen codeD;
req.ContentLength = send.Length;
tracingService.Trace（发送信息）;
流Sout = req.GetRequestStream（）;
sout.Write（发送，0，send.Length）;
sout.Flush（）;
sout.Close（）;
tracingService.Trace（信息发送）;
WebResponse的解析度= req.GetResponse（）;
StreamReader的SR =新的StreamReader（res.GetResponseStream（））;
字符串返回值= sr.ReadToEnd（）;
tracingService.Trace（返回值）;
entity.Attributes [new_receivesnewsletter] =真;
service.Update（实体）;
tracingService.Trace（通讯领域集）;
}
赶上（FaultException异常前）
{
抛出新InvalidPluginExecutionException（在插件中发生错误。前）;
}
}
}
}
} //结束类
}
中包含的InputParameters实体[目标]只包含的提交的更新的是，改田，不是所有领域。你的插件适用于创建因为InputParameters [目标]始终包含在一个所有字段创建效果显着。
要解决这个问题，你需要添加一个preImage在PluginRegistrationTool的步骤，其中包括primarycontactid领域。一个preImage将始终包含字段的值指定的，因为他们在更新之前的。
诀窍是[目标]首先检查primarycontactid上InputParameters，因为那样会包含最新值（如果用户在同一个更新的两个new_receivesnewsletter和primarycontactid保存，例如）。如果InputParameters [目标]不包含primarycontactid，然后退回到您的preImage，访问是这样的（假设你设置你的preImage的别名为preimage）：
<$p$p><$c$c>context.$p$pEntityImages["$p$pimage"].GetAttributeValue<EntityReference>("primarycontactid")
希望帮助！
this is a working example of a plugin that I have written for CRM 2011. I have created a 'Create' step in the plugin registration tool for this plugin. This executes fine. I also have an 'Update' step registered for the plugin. This fails to execute because the primary contact returned is null. These steps are both registered as asynchronous.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xrm.Sdk;
using System.ServiceModel;
using System.IO;
using System.Net;
namespace CRMNewsletterPlugin
{
public class NewsletterSignup : IPlugin
{
public void Execute(IServiceProvider serviceProvider)
{
ITracingService tracingService = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
// Obtain the execution context from the service provider.
IPluginExecutionContext context = (IPluginExecutionContext)
serviceProvider.GetService(typeof(IPluginExecutionContext));
tracingService.Trace("Begin load");
// The InputParameters collection contains all the data passed in the message request.
if (context.InputParameters.Contains("Target") &&
context.InputParameters["Target"] is Entity)
{
tracingService.Trace("We have a target.");
// Obtain the target entity from the input parmameters.
Entity entity = (Entity)context.InputParameters["Target"];
IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
if (!entity.GetAttributeValue<bool>("new_receivesnewsletter"))
{
try
{
//check if the account number exist
string emailAddress = entity.GetAttributeValue<string>("emailaddress1");
EntityReference primaryContact = entity.GetAttributeValue<EntityReference>("primarycontactid");
// UPDATE STEP FAILS HERE
if (primaryContact == null)
{
tracingService.Trace("Primary Contact is null");
}
Entity contact = service.Retrieve("contact", primaryContact.Id, new Microsoft.Xrm.Sdk.Query.ColumnSet(new string[] { "fullname" }));
string fullname = contact.GetAttributeValue<string>("fullname");
string name = entity.GetAttributeValue<string>("name");
WebRequest req = WebRequest.Create("http://localhost");
string postData = "cm-name=" + fullname + "&cm-ddurhy-ddurhy=" + emailAddress + "&cm-f-jddkju=" + name;
tracingService.Trace(postData);
byte[] send = Encoding.Default.GetBytes(postData);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = send.Length;
tracingService.Trace("Sending info");
Stream sout = req.GetRequestStream();
sout.Write(send, 0, send.Length);
sout.Flush();
sout.Close();
tracingService.Trace("Info sent");
WebResponse res = req.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream());
string returnvalue = sr.ReadToEnd();
tracingService.Trace(returnvalue);
entity.Attributes["new_receivesnewsletter"] = true;
service.Update(entity);
tracingService.Trace("Newsletter field set");
}
catch (FaultException ex)
{
throw new InvalidPluginExecutionException("An error occurred in the plug-in.", ex);
}
}
}
}
}//end class
}
The entity contained in the InputParameters["Target"] only includes the changed fields that were submitted in the update, not all fields. Your plugin works for Create because InputParameters["Target"] always contains all fields during a Create obviously.
To fix this, you need to add a PreImage to your step in PluginRegistrationTool that includes the primarycontactid field. A PreImage will always include the values for the fields you specify as they were before the update.
The trick is to check for primarycontactid on InputParameters["Target"] first, because that would contain the latest value (if the user updated both new_receivesnewsletter and primarycontactid during the same save, for example). If InputParameters["Target"] doesn't contain primarycontactid, then fall back on your PreImage, accessed something like this (assuming you set your PreImage's alias to "preimage"):
context.PreEntityImages["preimage"].GetAttributeValue<EntityReference>("primarycontactid")
Hope that helps!
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