Initialize CBDD solution and add a .NET-focused gitignore for generated artifacts.

src/CBDD.Core/Query/BTreeQueryable.cs

@@ -0,0 +1,56 @@
+using System.Collections;
+using System.Linq;
+using System.Linq.Expressions;
+
+namespace ZB.MOM.WW.CBDD.Core.Query;
+
+internal class BTreeQueryable<T> : IOrderedQueryable<T>
+{
+    /// <summary>
+    /// Initializes a new queryable wrapper for the specified provider and expression.
+    /// </summary>
+    /// <param name="provider">The query provider.</param>
+    /// <param name="expression">The expression tree.</param>
+    public BTreeQueryable(IQueryProvider provider, Expression expression)
+    {
+        Provider = provider;
+        Expression = expression;
+    }
+
+    /// <summary>
+    /// Initializes a new queryable wrapper for the specified provider.
+    /// </summary>
+    /// <param name="provider">The query provider.</param>
+    public BTreeQueryable(IQueryProvider provider)
+    {
+        Provider = provider;
+        Expression = Expression.Constant(this);
+    }
+
+    /// <summary>
+    /// Gets the element type returned by this query.
+    /// </summary>
+    public Type ElementType => typeof(T);
+
+    /// <summary>
+    /// Gets the expression tree associated with this query.
+    /// </summary>
+    public Expression Expression { get; }
+
+    /// <summary>
+    /// Gets the query provider for this query.
+    /// </summary>
+    public IQueryProvider Provider { get; }
+
+    /// <inheritdoc />
+    public IEnumerator<T> GetEnumerator()
+    {
+        return Provider.Execute<IEnumerable<T>>(Expression).GetEnumerator();
+    }
+
+    /// <inheritdoc />
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+        return GetEnumerator();
+    }
+}