Sol dış birleştirmeyi here, ancak dinamik linq uzantısı yöntemlerini kullanarak taklit etmeye çalışıyorum. i var Ne:Dinamik Linq ile sol dış birleştirme nasıl yapılır?
public static IQueryable SelectMany(this IQueryable source, string selector,
string resultsSelector, params object[] values)
{
if (source == null) throw new ArgumentNullException("source");
if (selector == null) throw new ArgumentNullException("selector");
// Parse the lambda
LambdaExpression lambda = DynamicExpression.ParseLambda(
source.ElementType, null, selector, values);
// Fix lambda by recreating to be of correct Func<> type in case
// the expression parsed to something other than IEnumerable<T>.
// For instance, a expression evaluating to List<T> would result
// in a lambda of type Func<T, List<T>> when we need one of type
// an Func<T, IEnumerable<T> in order to call SelectMany().
Type inputType = source.Expression.Type.GetGenericArguments()[0];
Type resultType = lambda.Body.Type.GetGenericArguments()[0];
Type enumerableType = typeof(IEnumerable<>).MakeGenericType(resultType);
Type delegateType = typeof(Func<,>).MakeGenericType(inputType,
enumerableType);
lambda = Expression.Lambda(delegateType, lambda.Body, lambda.Parameters);
ParameterExpression[] parameters = new ParameterExpression[] {
Expression.Parameter(source.ElementType, "outer"),
Expression.Parameter(resultType, "inner")
};
LambdaExpression resultsSelectorLambda = DynamicExpression.ParseLambda(
parameters, null, resultsSelector, values);
// Create the new query
return source.Provider.CreateQuery(Expression.Call(typeof(Queryable),
"SelectMany", new Type[] {
source.ElementType,
resultType,
resultsSelectorLambda.Body.Type
}, source.Expression, Expression.Quote(lambda),
Expression.Quote(resultsSelectorLambda)));
}
ve: SelectMany
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