Question

Is there a way to do something like this:

//Create Connection.
NMBSReportViewer.Models.SchoolEntities db = new NMBSReportViewer.Models.SchoolEntities();

//Get the Data Using the Report's Stored QueryString.
String QueryString = report.Query; //"SELECT VALUE c FROM SchoolEntities.Courses AS c WHERE c.Credits > 0";
IQueryable<dynamic> data = db.CreateQuery<dynamic>(QueryString);

//Given String FieldName, String Operator, & String Value, from user, Filter the Above dataset.
data.Where(c => c.'FieldName' 'Operator' 'Value');

I’m assuming there’s nothing like I have above, but is there a way to achieve the same end result?
I am going to have Dropdownlists of the Fields and operators for the user and then they will input a value they want in a textbox for the three values, so the FieldName is should always be a viable field in the set.

Is there a way in LINQ to do such a thing?
If there isn’t a way to do that…
Is there a way to create an IQueryable with a static type of “SchoolEntities.Course” given just the string?

Answer 1

Sorry for the Confusion, I guess Entity Framework wasn’t an option after all.

In the end I guess I’ll have to use this approach in order to maintain the freedom from redeploying the project everytime the database gains or loses a table.

static void Main(string[] args)
{
//Connection String
String ConnectionString = @"Data Source = localhost\SQLEXPRESS; Initial Catalog = School; Trusted_Connection=True;";

//Create the Connection
SqlConnection DbConn = new SqlConnection(ConnectionString);

//Open the Connection
DbConn.Open();

//Query String
String QueryString = "SELECT * FROM COURSE";

//Create the SqlCommand Object
SqlCommand QueryCommand = new SqlCommand(QueryString, DbConn);

//Use the SqlCommand to create the DataReader Object.
SqlDataReader QueryCommandReader = QueryCommand.ExecuteReader();

//Create the Datatable.
DataTable DataT = new DataTable();

//Load the Data into the Table.
DataT.Load(QueryCommandReader);

//Get the User Input
String Expression = "Credits > 3";

//Create DataRows and Filter Table.
List<DataRow> FilteredData = new List<DataRow>();
FilteredData = DataT.Select(Expression).ToList();
}

Thank you for the help and information. Sorry it wasn’t entirely a clear question.