使用C＃从CRM 365中的Lookup动态获取价值

Question

I have an entity "new_trialxrmservicetoolkit" inside it I have lookup field "new_LookupTransactionHeader" and it linked to "new_transactionheader" entity.

How to solve this?

I follow this tutorial but doesn't solve what I am looking for.

My Code:

new_trialxrmservicetoolkit t = new new_trialxrmservicetoolkit();

ColumnSet myAttributes = new ColumnSet(new String[] { "new_LookupTransactionHeader" });
Entity myEntityHavingLookup = service.Retrieve("new_transactionheader", t.id, myAttributes);
var myLookupId = ((Microsoft.Xrm.Sdk.EntityReference)(myEntityHavingLookup.Attributes["new_LookupTransactionHeader"])).Id;

throw new InvalidPluginExecutionException(myLookupId.ToString()); // catch this result

this the result when I test the plugin:

Answer 1

Is this code running inside a plugin registered for ' new_trialxrmservicetoolkit '? If yes, then use below code.

var entity = (Entity)context.InputParameters["Target"];
if (entity.LogicalName != "new_trialxrmservicetoolkit")
    return;
var entityId=  entity.Id;
ColumnSet myAttributes = new ColumnSet(new String[] { "new_LookupTransactionHeader" });
Entity myEntityHavingLookup = service.Retrieve("new_trialxrmservicetoolkit", entityId, myAttributes);
var myLookupId = ((Microsoft.Xrm.Sdk.EntityReference)(myEntityHavingLookup.Attributes["new_LookupTransactionHeader"])).Id;
throw new InvalidPluginExecutionException(myLookupId.ToString());

If the plugin is for a 'Delete' message, Change the first line of my code:

var entity = (EntityReference)context.InputParameters["Target"];

Answer 2

t is of type new_trialxrmservicetoolkit , you cannot use t.id for new_LookupTransactionHeader type.

Get the lookup id from targetentity & use it to retrieve other columns.

Answer 3

Get Value of Lookup fields

EntityReference entref = (EntityReference)item.Attributes[attributeName];

var LookupId = entref.Id;

var logicalName = entref.LogicalName;

Set Value of Lookup fields

newAccount[attributeName] = new EntityReference(logicalName, LookupId);

Set Null Value of Lookup fields

newAccount[attributeName] = Null;