generate a sql query from class in csharp

One approach to generate a SQL query from a class in C# is to use an Object-Relational Mapping (ORM) tool. An ORM tool can map a class to a database table and provide methods to query, insert, update, and delete records.

Here's an example using Entity Framework, a popular ORM tool in .NET:

main.cs
using (var context = new MyDbContext()) 
{
    var query = from p in context.Products
                where p.Category == "Food"
                select p;

    string sql = query.ToSql();
    Console.WriteLine(sql);
}
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In this example, MyDbContext is a class derived from DbContext that represents a database context. Products is a property of MyDbContext that represents a database table. The LINQ query generates a SQL query that selects all products where the category is "Food". The ToSql() method is an extension method that converts the LINQ query to a SQL query string.

Note that the exact syntax of the generated SQL query may depend on the database provider used by Entity Framework.