We can use PowerShell to discover many SSRS properties, including the different parameters available in a report. This blog post is based on SQL Server 2014 and PowerShell V5.

The example report utilizes different variations of parameters. In the example, Customer ID is an integer. Order Date From and To are dates. Online Flag is a boolean. Min Total Due is a float. Status is a multi-value text.

Additional properties can be found in the Report Parameter window, including whether the parameter is nullable, if it’s multivalued, or if it’s visible or hidden, etc.

To do this in PowerShell, the first thing to do is to add the assembly that will allow us to create the ReportViewer object. Note that the version and public key token are specified, so check the version you have on your machine to ensure the accuracy.

See full blog post here