Yes, tabular server supports .Net Provider but only for those Data Sources which are mentioned in this article –  Data Sources Supported (SSAS Tabular)

Take an example of Oracle, if you select Oracle in “Table Import Wizard” and click on Next, you will find Connect to an Oracle Database Windows -> on that windows select Advanced and it will provide  an option of Selecting Providers, if you notice in screenshot as follow you can see Oracle Data Provider for .Net is present.

What about other data sources which are not appearing in the Table Import Wizard Relational Databases List, for such sources you can use Others (Oledb/ODBC)

This option should work if you are able to connect to your Data Source using ODBC, I have tested with SQL Engine and it worked like charm and same manner I had tested with Hadoop (HDInsight) as well

2) If ODBC Providers supported by Tabular Server, then why its not working for me?

ODBC is supported by Tabular Server but you need to configure 2 DSN one for 32 BIT and second for 64 BIT but with same name, otherwise you will get an error message while importing data.

Why we need 2 ODBC DSN?

32 Bit is for SSDT and 64 BIT is used by Tabular Engine while importing data in Tabular Server, further explained in this post Post Link

Applies to: SQL Server 2012

Summary: Tabular models hosted in SQL Server 2012 Analysis Service provide a comparatively lightweight, easy to build and deploy solution for business intelligence. However, as you increase the data load, add more users, or run complex queries, you need to have a strategy for maintaining and tuning performance. This paper describes strategies and specific techniques for getting the best performance from your tabular models, including processing and partitioning strategies, DAX query tuning, and server tuning for specific workloads

To review the document, please download the Performance Tuning of Tabular Models in SQL Server 2012 Analysis Services Word document.

When using ODBC as a Data Source in the Table Import Wizard to add data to a Tabular Server, we are getting the following  error; however, preview shows the data correctly:

Error Message:

OLE DB or ODBC error: [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application; IM014.

A connection could not be made to the data source with the DataSourceID of '7300a711-299c-4367-98eb-b2e01b7e4ba5', Name of 'Custom 4'.

An error occurred while processing the partition 'DimAccount 1_e8a5233f-406a-450d-8b2e-8bf86a321d2f' in table 'DimAccount 1_e8a5233f-406a-450d-8b2e-8bf86a321d2f'.

The current operation was cancelled because another operation in the transaction failed.

Environment

SSAS Tabular Server 2012 x64

Assessment

Read more………………….Link

Refer this blog for further information: https://blogs.msdn.com/b/analysisservices/archive/2013/05/31/power-view-connectivity-for-multidimensional-models-released.aspx

select CalendarYear,color,sum(SalesAmount) from [DimProduct] join FactInternetSales
on DimProduct.[ProductKey]=FactInternetSales.[ProductKey]
join DimDate
on dimdate.datekey=FactInternetSales.OrderDatekey
Group by CalendarYear,color
Having sum(salesamount)>5000
order by CalendarYear,color

Equivalent Dax of achieving same is:

evaluate( filter (summarize ('Internet Sales', 'Date'[Calendar Year],
'Product'[Color] ,"Sales Amount",sum('Internet Sales'[Sales Amount]))
,Calculate(sum('Internet Sales'[Sales Amount]))>5000))
order by 'Date'[Calendar Year],
'Product'[Color]

   1:  [Reflection.Assembly]::LoadWithPartialName("Microsoft.AnalysisServices")

   2:  $ServerName = ".\sql2008r2"

   3:  $DB = "Adventure Works DW 2008"

   4:  $Server = New-Object Microsoft.AnalysisServices.Server

   5:  $Server.Connect($ServerName)

   6:  $SSASDatabase = $Server.Databases.Item($DB)

   7:  $SSASDatabase.Roles | Select Name, Members