Convert FetchXML to QueryExpression?

FetchXML and QueryExpression are two different query languages used to retrieve data from Microsoft Dynamics CRM. FetchXML is an XML-based query language that is used to retrieve data in a more simplified way, while QueryExpression is a more powerful and complex query language that provides more options and capabilities.

In some cases, you may need to convert FetchXML to QueryExpression in order to take advantage of the additional capabilities provided by QueryExpression. Fortunately, this process can be accomplished relatively easily using the FetchXmlToQueryExpressionRequest class provided by the CRM SDK.

Here's an example of how to convert FetchXML to QueryExpression using the FetchXmlToQueryExpressionRequest class:

using Microsoft.Xrm.Sdk; using Microsoft.Xrm.Sdk.Messages; string fetchXml = "<fetch version='1.0' output-format='xml-platform' mapping='logical' distinct='false'>" + "<entity name='account'>" + "<attribute name='name'/>" + "<attribute name='address1_city'/>" + "<filter type='and'>" + "<condition attribute='address1_city' operator='eq' value='Seattle'/>" + "</filter>" + "</entity>" + "</fetch>"; FetchXmlToQueryExpressionRequest request = new FetchXmlToQueryExpressionRequest() { FetchXml = fetchXml }; FetchXmlToQueryExpressionResponse response = (FetchXmlToQueryExpressionResponse)service.Execute(request); QueryExpression query = response.Query;

In this example, a FetchXML query is created to retrieve all accounts located in Seattle. The FetchXmlToQueryExpressionRequest class is then used to convert the FetchXML query to a QueryExpression object. The resulting QueryExpression object can then be used to retrieve the data from the CRM using the RetrieveMultiple method.

It's important to keep in mind that, the conversion process may not always result in an exact match, as some FetchXML features may not have a direct equivalent in QueryExpression. Additionally, some of the complexities of FetchXML may get lost in the conversion process.

In conclusion, converting FetchXML to QueryExpression is a process that can be accomplished relatively easily using the FetchXmlToQueryExpressionRequest class provided by the CRM SDK. This process allows you to take advantage of the additional capabilities provided by QueryExpression while still using the simplicity of FetchXML. However, it's important to keep in mind that the conversion process may not always result in an exact match and some of the complexities of FetchXML may get lost in the conversion process.