This is already available in Entity Framework 4.1.
See here for a reference for how to use the include feature, it also shows how to include multiple levels: http://msdn.microsoft.com/en-us/library/gg671236(VS.103).aspx
The strongly typed Include()
method is an extension method so you have to remember to declare the using System.Data.Entity;
statement.
Credit goes to Joe Ferner:
public static class ObjectQueryExtensionMethods {
public static ObjectQuery<T> Include<T>(this ObjectQuery<T> query, Expression<Func<T, object>> exp) {
Expression body = exp.Body;
MemberExpression memberExpression = (MemberExpression)exp.Body;
string path = GetIncludePath(memberExpression);
return query.Include(path);
}
private static string GetIncludePath(MemberExpression memberExpression) {
string path = "";
if (memberExpression.Expression is MemberExpression) {
path = GetIncludePath((MemberExpression)memberExpression.Expression) + ".";
}
PropertyInfo propertyInfo = (PropertyInfo)memberExpression.Member;
return path + propertyInfo.Name;
}
}
ctx.Users.Include(u => u.Order.Item)
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