System.NullReferenceException: 对象未设置为对象的实例?
System.NullReferenceException: Object not set to an instance of an object?
我正在写一个插件,当合同被取消时删除两个日期之间的记录...要删除的记录是从取消日期到合同结束。这是我正在使用的代码:
using System;
using System.Linq;
using System.ServiceModel;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Query;
/// <summary>
/// This plugin will trimm off unit orders after a contract is cancelled before the end of the contract duration
/// </summary>
namespace DCWIMS.Plugins
{
[CrmPluginRegistration(MessageNameEnum.Update,
"contract",
StageEnum.PostOperation,
ExecutionModeEnum.Asynchronous,
"statecode",
"Post-Update On Cancel Contract",
1000,
IsolationModeEnum.Sandbox,
Image1Name = "PreImage",
Image1Type = ImageTypeEnum.PreImage,
Image1Attributes = "")]
public class UnitPluginOnCancel : IPlugin
{
public void Execute(IServiceProvider serviceProvider)
{
// Extract the tracing service for use in debugging sandboxed plug-ins.
// Will be registering this plugin, thus will need to add tracing service related code.
ITracingService tracing = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
//obtain execution context from service provider.
IPluginExecutionContext context = (IPluginExecutionContext)
serviceProvider.GetService(typeof(IPluginExecutionContext));
// InputParameters collection contains all the data passed in the message request.
if (context.InputParameters.Contains("Target") &&
context.InputParameters["Target"] is Entity)
{
Entity entity = (Entity)context.InputParameters["Target"];
//Get the before image of the updated contract
Entity PreImage = context.PreEntityImages["PreImage"];
//verify that the target entity represents the the contract entity has been cancelled
if (entity.LogicalName != "contract" || entity.GetAttributeValue<OptionSetValue>("statecode").Value != 4)
return;
//obtain the organization service for web service calls.
IOrganizationServiceFactory serviceFactory =
(IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
//Core Plugin code in Try Block
try
{
//Get Contract line start date
var startDate = entity.GetAttributeValue<DateTime>("cancelon");
//Get Contract Line End Date
DateTime endDate = (DateTime)PreImage["expireson"];
//Get Contract range into weekdays list
Eachday range = new Eachday();
var weekdays = range.WeekDay(startDate, endDate);
//Get Unit Order Lookup Id
EntityReference unitOrder = (EntityReference)PreImage.Attributes["new_unitorderid"];
var unitOrderId = unitOrder.Id;
var unitOrders = service.Retrieve(unitOrder.LogicalName, unitOrder.Id, new ColumnSet("new_name"));
var uiName = unitOrders.GetAttributeValue<string>("new_name");
//Get Entity Collection to delete
string fetchXml = @" <fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false' top='2000'>
<entity name='new_units'>
<link-entity name='new_alterunitorder' from ='new_orderlineid' to = 'new_unitsid' >
<attribute name='new_alterunitorderid' />
<filter type='and'>
<condition attribute='new_orderdate' operator='on-or-after' value='" + startDate.ToShortDateString() + @"' />
<condition attribute='new_orderdate' operator='on-or-before' value='" + endDate.ToShortDateString() + @"' />
<condition attribute='new_orderlineid' operator='eq' uiname='" + uiName + @"' uitype='new_units' value='" + unitOrderId + @"' />
</filter>
</link-entity>
</entity>
</fetch>";
var result = service.RetrieveMultiple(new FetchExpression(fetchXml));
var entityRefs = result.Entities.Select(e => e.GetAttributeValue<EntityReference>("new_alterunitorderid"));
var batchSize = 1000;
var batchNum = 0;
var numDeleted = 0;
while (numDeleted < entityRefs.Count())
{
var multiReq = new ExecuteMultipleRequest()
{
Settings = new ExecuteMultipleSettings()
{
ContinueOnError = false,
ReturnResponses = false
},
Requests = new OrganizationRequestCollection()
};
var currentList = entityRefs.Skip(batchSize * batchNum).Take(batchSize).ToList();
currentList.ForEach(r => multiReq.Requests.Add(new DeleteRequest { Target = r }));
service.Execute(multiReq);
numDeleted += currentList.Count;
batchNum++;
}
}
catch (FaultException<OrganizationServiceFault> ex)
{
throw new InvalidPluginExecutionException("An error occured.. Phil is responsible. ", ex);
}
catch (Exception ex)
{
tracing.Trace("An error occured: {0}", ex.ToString());
throw;
}
}
}
}
}
我在第 55 行收到 NullReferenceException...我确实对以前的插件使用了同一行,没有任何问题。取消合同的状态码值为 4,我只希望插件合同解除时执行。这是调试的图像。
我之前在另一个作用于合约实体的插件上使用过这个语句并且它工作正常,我不知道为什么这次它不工作。声明如下:
//verify that the target entity represents the the contract entity has been cancelled
if (entity.LogicalName != "contract" || entity.GetAttributeValue<OptionSetValue>("statecode").Value != 4)
return;
您从输入参数中获得的 entity
可能没有 StateCode,因此 .Value
失败。
也许在取消引用 .Value
.
之前尝试 entity.GetAttributeValue<OptionSetValue>("statecode")
或 entity.Contains("statecode")
看看是否有任何内容
既然你有 PreImage
,你可能想在那里寻找 statecode
。
检查您在调试时是否使用了正确的配置文件...如果您使用了错误的配置文件,空引用将在不应该通过的方法上通过!
希望对您有所帮助!
我正在写一个插件,当合同被取消时删除两个日期之间的记录...要删除的记录是从取消日期到合同结束。这是我正在使用的代码:
using System;
using System.Linq;
using System.ServiceModel;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Query;
/// <summary>
/// This plugin will trimm off unit orders after a contract is cancelled before the end of the contract duration
/// </summary>
namespace DCWIMS.Plugins
{
[CrmPluginRegistration(MessageNameEnum.Update,
"contract",
StageEnum.PostOperation,
ExecutionModeEnum.Asynchronous,
"statecode",
"Post-Update On Cancel Contract",
1000,
IsolationModeEnum.Sandbox,
Image1Name = "PreImage",
Image1Type = ImageTypeEnum.PreImage,
Image1Attributes = "")]
public class UnitPluginOnCancel : IPlugin
{
public void Execute(IServiceProvider serviceProvider)
{
// Extract the tracing service for use in debugging sandboxed plug-ins.
// Will be registering this plugin, thus will need to add tracing service related code.
ITracingService tracing = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
//obtain execution context from service provider.
IPluginExecutionContext context = (IPluginExecutionContext)
serviceProvider.GetService(typeof(IPluginExecutionContext));
// InputParameters collection contains all the data passed in the message request.
if (context.InputParameters.Contains("Target") &&
context.InputParameters["Target"] is Entity)
{
Entity entity = (Entity)context.InputParameters["Target"];
//Get the before image of the updated contract
Entity PreImage = context.PreEntityImages["PreImage"];
//verify that the target entity represents the the contract entity has been cancelled
if (entity.LogicalName != "contract" || entity.GetAttributeValue<OptionSetValue>("statecode").Value != 4)
return;
//obtain the organization service for web service calls.
IOrganizationServiceFactory serviceFactory =
(IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);
//Core Plugin code in Try Block
try
{
//Get Contract line start date
var startDate = entity.GetAttributeValue<DateTime>("cancelon");
//Get Contract Line End Date
DateTime endDate = (DateTime)PreImage["expireson"];
//Get Contract range into weekdays list
Eachday range = new Eachday();
var weekdays = range.WeekDay(startDate, endDate);
//Get Unit Order Lookup Id
EntityReference unitOrder = (EntityReference)PreImage.Attributes["new_unitorderid"];
var unitOrderId = unitOrder.Id;
var unitOrders = service.Retrieve(unitOrder.LogicalName, unitOrder.Id, new ColumnSet("new_name"));
var uiName = unitOrders.GetAttributeValue<string>("new_name");
//Get Entity Collection to delete
string fetchXml = @" <fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false' top='2000'>
<entity name='new_units'>
<link-entity name='new_alterunitorder' from ='new_orderlineid' to = 'new_unitsid' >
<attribute name='new_alterunitorderid' />
<filter type='and'>
<condition attribute='new_orderdate' operator='on-or-after' value='" + startDate.ToShortDateString() + @"' />
<condition attribute='new_orderdate' operator='on-or-before' value='" + endDate.ToShortDateString() + @"' />
<condition attribute='new_orderlineid' operator='eq' uiname='" + uiName + @"' uitype='new_units' value='" + unitOrderId + @"' />
</filter>
</link-entity>
</entity>
</fetch>";
var result = service.RetrieveMultiple(new FetchExpression(fetchXml));
var entityRefs = result.Entities.Select(e => e.GetAttributeValue<EntityReference>("new_alterunitorderid"));
var batchSize = 1000;
var batchNum = 0;
var numDeleted = 0;
while (numDeleted < entityRefs.Count())
{
var multiReq = new ExecuteMultipleRequest()
{
Settings = new ExecuteMultipleSettings()
{
ContinueOnError = false,
ReturnResponses = false
},
Requests = new OrganizationRequestCollection()
};
var currentList = entityRefs.Skip(batchSize * batchNum).Take(batchSize).ToList();
currentList.ForEach(r => multiReq.Requests.Add(new DeleteRequest { Target = r }));
service.Execute(multiReq);
numDeleted += currentList.Count;
batchNum++;
}
}
catch (FaultException<OrganizationServiceFault> ex)
{
throw new InvalidPluginExecutionException("An error occured.. Phil is responsible. ", ex);
}
catch (Exception ex)
{
tracing.Trace("An error occured: {0}", ex.ToString());
throw;
}
}
}
}
}
我在第 55 行收到 NullReferenceException...我确实对以前的插件使用了同一行,没有任何问题。取消合同的状态码值为 4,我只希望插件合同解除时执行。这是调试的图像。
我之前在另一个作用于合约实体的插件上使用过这个语句并且它工作正常,我不知道为什么这次它不工作。声明如下:
//verify that the target entity represents the the contract entity has been cancelled
if (entity.LogicalName != "contract" || entity.GetAttributeValue<OptionSetValue>("statecode").Value != 4)
return;
您从输入参数中获得的 entity
可能没有 StateCode,因此 .Value
失败。
也许在取消引用 .Value
.
entity.GetAttributeValue<OptionSetValue>("statecode")
或 entity.Contains("statecode")
看看是否有任何内容
既然你有 PreImage
,你可能想在那里寻找 statecode
。
检查您在调试时是否使用了正确的配置文件...如果您使用了错误的配置文件,空引用将在不应该通过的方法上通过!
希望对您有所帮助!