首先我們需要確定windows workflow foundation 已經安裝.

創建之後先移除MyCustomWorkflows 裏面的 Activity.xaml

從packages\Microsoft.CrmSdk.XrmTooling.PluginRegistrationTool.9.0.2.12\tools 路徑中添加以下兩個reference

復制下面的代碼到我們新建的GetTaxWorkflow.cs

因為我們在CRM裏面定義的custom entity是鍵值對的形式出現, 所以我們需要input值和output值.

我們有以下幾個方式獲取數據. 這裏我們使用Query By Attribute

1. UsingRetrieve (必須獲得GUID)

2. QueryExpression (可以實現復雜的邏輯)

3. Query By Attribute (簡化的QueryExpression)

4. FatchXML

5. LINQ

    public class GetTaxWorkflow : CodeActivity
    {
        [Input("Key")]
        public InArgument<string> Key { get; set; }

        [Output("Tax")]
        
 
public OutArgument<string> Tax { get; set; }

        protected override void Execute(CodeActivityContext executionContext)
        {
            //Create the tracing service
            ITracingService tracingService = executionContext.GetExtension<ITracingService>();

            
 
//Create the context
            IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
            IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

            var key = Key.Get(executionContext);

            // Get data from Configuraton Entity
            // Call organization web service

            QueryByAttribute query = new QueryByAttribute("contoso_configuration");
            query.ColumnSet = new ColumnSet(new string[] { "contoso_value" });
            query.AddAttributeValue("contoso_name", key);
            EntityCollection collection = service.RetrieveMultiple(query);

            if (collection.Entities.Count != 1)
            {
                tracingService.Trace("Something is wrong with configuration");

            }

            Entity config = collection.Entities.FirstOrDefault();

            tracingService.Trace(config.Attributes["contoso_value"].ToString());
            Tax.Set(executionContext, config.Attributes["contoso_value"].ToString());
        }
    }

記得註冊這個assembly

然後讓我們build一下項目. 我們的workflow dll就會在debug中

創建一個dynamics CRM workflow (四) - Development of Custom Workflows