有没有办法在CRM Dynamics中查看LINQ生成的查询表达式？

Question

考虑到CRM Dynamics中的LINQ查询被转换为查询表达式(源):

[...] OrganizationServiceContext类包含一个基础LINQ查询提供程序,它将LINQ查询从Microsoft Visual C#或Microsoft Visual Basic .NET语法转换为Microsoft Dynamics CRM使用的查询API.[...]

有没有办法看到生成的查询表达式(因为它可以在Linq-to-Sql或Linq-to-Entities中看到生成的SQL查询)？

Answer 1

您可以使用反射来获取查询对象,然后将其转换为FetchXML查询以获取可打印查询.这将适用于早期绑定和后期绑定查询.

来自:https://pogo69.wordpress.com/2012/04/05/crm-linq-provider-converting-expressions-to-queryexpression-andor-fetchxml/

var connectionString = @"SET YOUR CONNECTION STRING";

var service = new CrmServiceClient(connectionString);   

using (var xrm = service.OrganizationServiceProxy)
{

    OrganizationServiceContext orgContext =
                new OrganizationServiceContext(xrm);

    var query = from c in orgContext.CreateQuery("contact")
                join a in orgContext.CreateQuery("account")
                    on c["contactid"] equals a["primarycontactid"]
                where (String)c["lastname"] == "Wilcox" ||
                    (String)c["lastname"] == "Andrews"
                where ((String)a["address1_telephone1"]).Contains("(206)")
                    || ((String)a["address1_telephone1"]).Contains("(425)")
                select new
                {
                    Contact = new
                    {
                        FirstName = c["firstname"],
                        LastName = c["lastname"]
                    },
                    Account = new
                    {
                        Address1_Telephone1 = a["address1_telephone1"]
                    }
                };

    IQueryProvider queryProvider = query.Provider;      

    MethodInfo translateMethodInfo = queryProvider.GetType().GetMethod("Translate");
    QueryExpression queryEx = (QueryExpression)translateMethodInfo.Invoke(queryProvider, new object[] { query.Expression });        

    QueryExpressionToFetchXmlRequest reqConvertToFetchXml = new QueryExpressionToFetchXmlRequest { Query = queryEx };
    QueryExpressionToFetchXmlResponse respConvertToFetchXml = (QueryExpressionToFetchXmlResponse)xrm.Execute(reqConvertToFetchXml);

    Console.WriteLine("To FetchXML:" + Environment.NewLine + Environment.NewLine);
    Console.WriteLine(respConvertToFetchXml.FetchXml);

或者,您可以使用Fiddler捕获SOAP消息中发送的实际查询文本.我以前做过这个,并没有发现它比FetchXml更有价值.