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2011-02-26T17:32:05.197
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<p>In an expression visitor you would override the method call. Check if the method is Queryable.Where, and if so, the methods second parameter is a quoted expression of type lambda expression. Fish it out and you can screw with it.</p> <pre><code> static void Main() { IQueryable<int> queryable = new List<int>(Enumerable.Range(0, 10)).AsQueryable(); IQueryable<string> queryable2 = queryable .Where(integer => integer % 2 == 0) .OrderBy(x => x) .Select(x => x.ToString()); var expression = Rewrite(queryable2.Expression); } private static Expression Rewrite(Expression expression) { var visitor = new AddToWhere(); return visitor.Visit(expression); } class AddToWhere : ExpressionVisitor { protected override Expression VisitMethodCall(MethodCallExpression node) { ParameterExpression parameter; LambdaExpression lambdaExpression; if (node.Method.DeclaringType != typeof(Queryable) || node.Method.Name != "Where" || (lambdaExpression = ((UnaryExpression)node.Arguments[1]).Operand as LambdaExpression).Parameters.Count != 1 || (parameter = lambdaExpression.Parameters[0]).Type != typeof(int)) { return base.VisitMethodCall(node); } return Expression.Call( node.Object, node.Method, this.Visit(node.Arguments[0]), Expression.Quote( Expression.Lambda( lambdaExpression.Type, Expression.AndAlso( lambdaExpression.Body, Expression.Equal( Expression.Modulo( parameter, Expression.Constant( 4 ) ), Expression.Constant( 0 ) ) ), lambdaExpression.Parameters ) ) ); } } } </code></pre>
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1. POUsing an existing IQueryable to create a new dynamic IQueryable
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Querying!

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A row detail

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