/// <summary>
/// This demonstrates how to plug a query expression into an EntitySet. It prints all customers and the
/// value of their purchases, filtering the purchases according to a specified predicate.
/// </summary>
static void QueryCustomers (Expression<Func<Purchase, bool>> purchasePredicate)
{
var data = new DemoData ();
// We do two special things to make this query work:
// (1) Call AsExpandable() on the Customer table
// (2) Call Compile() on the supplied predicate when it's used within an EntitySet.
// AsExpandable() returns a wrapper that strips away the call to Compile when the query is run.
var query =
from c in data.Customers.AsExpandable ()
where c.Purchases.Any (purchasePredicate.Compile ())
select new
{
c.Name,
FilteredPurchases =
from p in c.Purchases.Where (purchasePredicate.Compile ())
select p.Price
};
foreach (var customerResult in query)
{
Console.WriteLine (customerResult.Name);
foreach (decimal price in customerResult.FilteredPurchases)
Console.WriteLine (" $" + price);
}
}
public List<Tool> GetTools(Expression<Func<Tool, bool>> predicate)
{
if(predicate != null)
{
var preComp = predicate.Compile();
predicate = o => preComp(o) && o.Active == true;
return ausv1Context.Tools.Where(predicate.Compile()).ToList();
}
return ausv1Context.Tools.Where(o => o.Active == true).ToList();
}
/// <summary>
/// Задает значение свойству и сообщает о его изменении только если новое значение отличается.
/// </summary>
/// <typeparam name="TValue">Тип устанавливаемого значения</typeparam>
/// <param name="propertyExpression">Лямбда для получения имени свойства</param>
/// <param name="value">Устанавливаемое значение</param>
/// <param name="callerMemberName">Имя свойства</param>
/// <returns>Возвращает true если значение свойства было изменено</returns>
protected bool SetProperty <TValue>(Expression <Func <TValue> > propertyExpression, TValue value, [CallerMemberName] string callerMemberName = null)
{
var func = propertyExpression.Compile();
var funcValue = func();
if (Equals(funcValue, value))
{
return(false);
}
var propertyName = GetPropertyName(propertyExpression);
var owner = GetContainer(propertyExpression);
var ownerType = owner.GetType();
var fieldInfo = GetFieldRecursively(ownerType, propertyName);
if (fieldInfo != null)
{
fieldInfo.SetValue(owner, value);
OnPropertyChanged(callerMemberName);
return(true);
}
var propertyInfo = ownerType.GetProperty(propertyName);
if (propertyInfo != null)
{
propertyInfo.SetValue(owner, value);
OnPropertyChanged(callerMemberName);
return(true);
}
throw new NotSupportedException(propertyExpression.ToString());
}
public IEnumerable<User> Find(Expression<Func<User, bool>> where)
{
using (var db = new UserContext())
{
return db.Users.Where(where.Compile()).ToArray();
}
}
public static IObservable <TR> Bind <T, TR>(this T viewModel, System.Linq.Expressions.Expression <Func <T, TR> > outExpr, bool activate = false) where T : INotifyPropertyChanged
{
var expr = (System.Linq.Expressions.MemberExpression)outExpr.Body;
var prop = (System.Reflection.PropertyInfo)expr.Member;
var name = prop.Name;
var comp = outExpr.Compile();
var ret = Observable.FromEventPattern <PropertyChangedEventHandler, PropertyChangedEventArgs>(t => viewModel.PropertyChanged += t, t => viewModel.PropertyChanged -= t)
.Where(x => string.Equals(x.EventArgs.PropertyName, name))
.Select(x => comp(viewModel));
if (!activate)
{
return(ret);
}
var o = Observable.Create <TR>(obs => {
try
{
obs.OnNext(comp(viewModel));
}
catch (Exception e)
{
obs.OnError(e);
}
obs.OnCompleted();
return(Disposable.Empty);
});
return(o.Concat(ret));
}
private async Task TestFilter(Expression<Func<Order, bool>> predicate)
{
var table = Client.GetTable<Order>();
var items = await table.Where(predicate).OrderBy(o => o.Id).ToListAsync();
var expected = Orders.Where(predicate.Compile()).OrderBy(o => o.Id).ToArray();
ComparisonHelper.CompareAssert(expected, items);
}
public static void CheckExpression(Expression<Func<Boolean>> expression)
{
if (!expression.Compile()())
{
throw new MalformedException(string.Concat("Bad file format, expecting ", expression.ToString().Replace("() => ", string.Empty)));
}
}
public static T Eval <T>(this Expression expression)
{
Expression <Func <T> > lamda = Expression.Lambda <Func <T> >(expression);
T result = lamda.Compile()();
return(result);
}
public static void Bind <T, TR>(this T viewModel, System.Linq.Expressions.Expression <Func <T, TR> > outExpr, Action <TR> b, bool activateNow = false) where T : INotifyPropertyChanged
{
var expr = (System.Linq.Expressions.MemberExpression)outExpr.Body;
var prop = (System.Reflection.PropertyInfo)expr.Member;
var name = prop.Name;
var comp = outExpr.Compile();
viewModel.PropertyChanged += (sender, e) =>
{
if (e.PropertyName.Equals(name))
{
try
{
b(comp(viewModel));
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
};
if (activateNow)
{
try
{
b(comp(viewModel));
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
public static void BindCollection <T>(this T viewModel, System.Linq.Expressions.Expression <Func <T, INotifyCollectionChanged> > outExpr, Action <NotifyCollectionChangedEventArgs> b, bool activateNow = false) where T : INotifyPropertyChanged
{
var exp = outExpr.Compile();
var m = exp(viewModel);
m.CollectionChanged += (sender, e) =>
{
try
{
b(e);
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
};
if (activateNow)
{
try
{
b(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
}
static void Main()
{
System.Linq.Expressions.Expression <Action> expression = () =>
#endif
(
from currentTest in Enumerable.Range(0, Convert.ToInt32(Console.ReadLine()))
let numberOfVertexAndEdges = Console.ReadLine().Split()
let numberOfVertex = Convert.ToInt32(numberOfVertexAndEdges[0])
let numberOfEdges = Convert.ToInt32(numberOfVertexAndEdges[1])
select
(
from e in Enumerable.Range(0, numberOfEdges)
let edge = Console.ReadLine().Split()
let firstVertex = Convert.ToInt32(edge[0]) - 1
let secondVertex = Convert.ToInt32(edge[1]) - 1
select new { firstVertex, secondVertex }
).Aggregate(Enumerable.Range(0, numberOfVertex).ToArray(), (comp, newEdge) => (
from v in comp
select v == comp[newEdge.firstVertex] ?
Math.Min(v, comp[newEdge.secondVertex]) :
v == comp[newEdge.secondVertex] ? Math.Min(v, comp[newEdge.firstVertex]) : v
).ToArray()
).ToList().Distinct().Count()
).ToList().ForEach(result => Console.WriteLine(result))
#if !SATORI
;
expression.Compile().Invoke();
}
private void AssertJiraHttpLink(Expression<Func<IHttpInterfaceConfiguration, string>> configPropertyAccessor)
{
IHttpInterfaceConfiguration httpConfig = JiraConfig.Instance.HttpInterfaceConfiguration;
Assert.AreEqual(
ExpectedUrlFrom(configPropertyAccessor),
configPropertyAccessor.Compile().Invoke(httpConfig));
}
private void EntryTokenizeFormats(string token, Func<string[],string[]> tokenizer, Expression<Func<string[]>> expression)
{
var key = ExpressionHelper.GetExpressionText(expression);
var formats = tokenizer(expression.Compile().Invoke().ToArray());
TokenizeFormats[token + ":" + key] = formats;
}
public static Vector GradientDescent(
Expression<Func<Vector, double>> function,
Expression<Func<Vector, Vector>> gradient,
Vector x0,
int iter,
double stepSize,
out Vector trajectory)
{
trajectory = Vector.Zeros(iter);
var x = x0;
var obj = double.MaxValue;
var f = function.Compile();
var g = gradient.Compile();
for (int i = 0; i < iter; i++)
{
// calculate gradient
var grad = g(x);
// get step size (avoid overstepping)
var eta = stepSize / System.Math.Sqrt(iter + 1);
// take step
x = x - eta * grad;
// calculate objective
trajectory[i] = f(x);
// sanity check (don't want to take too many steps)
if (System.Math.Abs(obj - trajectory[i]) < MIN_DIFF)
break;
// start again
obj = trajectory[i];
}
return x;
}
public static void AddRequestProperty(Expression<Func<HttpRequestBase, object>> expression)
{
var property = ReflectionHelper.GetProperty(expression);
_systemProperties.Add(property);
_requestProperties[property.Name] = expression.Compile();
}
protected internal virtual string GetFriendlyName(Type type, Expression<Func<Type, string>> nameFunctionExpression)
{
if(type == null)
throw new ArgumentNullException("type");
if(nameFunctionExpression == null)
throw new ArgumentNullException("nameFunctionExpression");
if(type.IsGenericParameter)
return type.Name;
var name = nameFunctionExpression.Compile().Invoke(type);
if(!type.IsGenericType)
return name;
name = name.Substring(0, name.IndexOf("`", StringComparison.OrdinalIgnoreCase));
var genericArgumentFriendlyName = string.Empty;
foreach(var genericArgument in type.GetGenericArguments())
{
if(!string.IsNullOrEmpty(genericArgumentFriendlyName))
genericArgumentFriendlyName += ", ";
genericArgumentFriendlyName += this.GetFriendlyName(genericArgument, nameFunctionExpression);
}
return string.Format(CultureInfo.InvariantCulture, "{0}<{1}>", name, genericArgumentFriendlyName);
}
private static Func <object, object, object> CreateFunc(string program)
{
var assemblyName = new AssemblyName(Guid.NewGuid().ToString())
{
Version = new Version(1, 0)
};
AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName,
AssemblyBuilderAccess.Run);
ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("Program");
ParameterExpression valueParameter = Expression.Parameter(typeof(object), "value");
ParameterExpression parameterParameter = Expression.Parameter(typeof(object), "parameter");
AstHelper astHelper = AstHelper.Default(moduleBuilder);
astHelper.Variables.Add("value", valueParameter);
astHelper.Variables.Add("parameter", parameterParameter);
Expression rootExpression = ProgramExpression.Compile(astHelper, program);
Expression <Func <object, object, object> > lambda =
Expression.Lambda <Func <object, object, object> >(Expression.Convert(rootExpression, typeof(object)),
valueParameter, parameterParameter);
return(lambda.Compile());
}
public static void NotNullOrEmpty(Expression<Func<string>> expr)
{
if (!string.IsNullOrEmpty(expr.Compile()()))
return;
var param = (MemberExpression)expr.Body;
throw new ArgumentNullException("The parameter '" + param.Member.Name + "' cannot be null or empty.");
}
public RouteTarget(Expression<Func<IServiceLocator, object>> controllerExpr)
{
_controllerExpr = controllerExpr;
_controllerFunc = _controllerExpr.Compile();
ControllerType = ((_controllerExpr.Body as MethodCallExpression)?.Arguments?[0]
as ConstantExpression)?.Value as Type;
}
public void AddHttpMethodFilter(Expression<Func<ActionCall, bool>> filter, string method)
{
_httpMethodFilters.Add(new HttpMethodFilter{
Filter = filter.Compile(),
Description = filter.Body.ToString(),
Method = method
});
}
private static void DoAction(Expression<Action> action)
{
Console.Write("Executing {0} ... ", action.Body.ToString());
var act = action.Compile();
act.Invoke();
Console.WriteLine();
}
private Action<FunctionContext> CompileTree(Expression<Action<FunctionContext>> lambda)
{
if (this.CompileInterpretDecision == CompileInterpretChoice.AlwaysCompile)
{
return lambda.Compile();
}
int compilationThreshold = (this.CompileInterpretDecision == CompileInterpretChoice.NeverCompile) ? 0x7fffffff : -1;
return (Action<FunctionContext>) new LightCompiler(compilationThreshold).CompileTop(lambda).CreateDelegate();
}
public IEnumerable<Call> FindCalls(Expression<Func<CallInput, bool>> filter)
{
if (filter == null)
{
throw new ArgumentNullException("filter");
}
var predicate = filter.Compile();
return from call in _calls where predicate.Invoke(call.Input) select call;
}
private static void ArgumentIsTrueOrFalse(Expression<Func<bool>> expression, bool throwCondition, string exceptionMessage)
{
ArgumentNotNull(expression, nameof(expression));
if (expression.Compile().Invoke() == throwCondition)
{
var paramName = expression.GetMemberName();
throw new ArgumentException(exceptionMessage, paramName);
}
}
public void Property_ReturnsTheValueForTheSpecificCityType(ICity city,
Expression<Func<ICity, int>> property,
int expectedValue)
{
// :::: ACT ::::
var actualValue = property.Compile().Invoke(city);
// :::: ASSERT ::::
actualValue.Should().Be(expectedValue);
}
private static Action BuildAction(Expression<Func<bool>> spec)
{
return () =>
{
if (!spec.Compile()())
{
throw new AssertionException("Failed:" + SpecDescriber.DescribeSpec(spec));
}
};
}
public static void Assert(Expression<Func<bool>> assertion)
{
Func<bool> compiled = assertion.Compile();
bool evaluatedValue = compiled();
if (!evaluatedValue)
{
throw new InvalidOperationException(
string.Format("'{0}' is not met.", Normalize(assertion.ToString())));
}
}
public static IObservable <Unit> BindCollection <T>(this T viewModel, System.Linq.Expressions.Expression <Func <T, INotifyCollectionChanged> > outExpr, bool activate = false) where T : INotifyPropertyChanged
{
var exp = outExpr.Compile();
var m = exp(viewModel);
var ret = Observable.FromEventPattern <NotifyCollectionChangedEventHandler, NotifyCollectionChangedEventArgs>(t => m.CollectionChanged += t, t => m.CollectionChanged -= t)
.Select(_ => Unit.Default);
return(activate ? ret.StartWith(Unit.Default) : ret);
}
public void setName(string name,Expression<Func<string,bool>> exp)
{
if (name == "leo")
{
var func=exp.Compile();
if (func(name))
{
System.Console.WriteLine(name);
}
}
}
public IEnumerable<DalRole> GetByPredicate(Expression<Func<DalRole, bool>> f)
{
Func<DalRole, bool> func = f.Compile();
IEnumerable<DalRole> users = context.Set<Roles>().Where(u => true).AsEnumerable().Select(role => new DalRole()
{
Id = role.id,
Name = role.Name
}).AsEnumerable();
List<DalRole> result = users.Where(user => func(user)).ToList();
return result;
}
public void False(Expression<Func<bool>> matchFunc)
{
this.commandProvider.Act(() =>
{
var compiledFunc = matchFunc.Compile();
if (compiledFunc())
{
throw new FluentExpectFailedException("Expected expression [{0}] to return false.", matchFunc.ToExpressionString());
}
});
}
public virtual MetadataDefinitionGroupProjection WithTracking(Expression<Func<TrackingBase, Func<TrackingBase>>> tb)
{
SetUpdated();
return new MetadataDefinitionGroupProjection
{
Description = Description,
Identity = Identity,
Name = Name,
Tracking = tb.Compile().Invoke(Tracking).Invoke()
};
}
protected void given_remote_resource(string uri,
Expression<Func<IClientRequest, IClientResponse>> handler)
{
Client.Resources[uri.ToUri()] = new MemoryResource
{
Operations =
{
{ handler.Parameters[0].Name, handler.Compile() }
}
};
}
public DelegateCommand(Action<object> executeMethod, Expression<Func<object, bool>> canExecuteMethod)
{
_executeWithParameterMethod = executeMethod;
if (canExecuteMethod == null)
{
_canExecuteWithParameterMethod = ((obj) => true);
}
else
{
_canExecuteWithParameterMethod = canExecuteMethod.Compile();
}
}
public static void That(Expression<Func<bool>> assertion, string msg = null)
{
var compiled = assertion.Compile();
bool ok = false;
try {
ok = compiled();
} catch (Exception e) {
throw Err(assertion, msg ?? "failed with exception", e);
}
if (!ok)
throw Err(assertion, msg ?? "failed", null);
}
public ReusableValidator(Expression<Func<string>> property)
{
var lambda = property as LambdaExpression;
var member = lambda.Body as MemberExpression;
PropertyName = member.Member.Name;
Check = () =>
{
var value = property.Compile().Invoke();
return blacklistedWords.Any(x => (value ?? string.Empty).ToUpperInvariant().Contains(x.ToUpperInvariant()));
};
}
public Task<dynamic> VerifyCredentials(Expression<Func<VerifyCredentials, VerifyCredentials>> request = null)
{
var verifyCredentials = new VerifyCredentials(AccessToken, AccessTokenSecret, ConsumerKey, ConsumerSecret);
// if request was specified process it
if (request != null)
{
Func<VerifyCredentials, VerifyCredentials> func = request.Compile();
verifyCredentials = func.Invoke(verifyCredentials);
}
Task<dynamic> result = TwitterEngine.MakeRequest(verifyCredentials);
return result;
}
public Task<dynamic> CreateTweet(String status, Expression<Func<CreateTweet, CreateTweet>> request = null)
{
var update = new CreateTweet(status, AccessToken, AccessTokenSecret, ConsumerKey, ConsumerSecret);
// if request was specified process it
if (request != null)
{
Func<CreateTweet, CreateTweet> func = request.Compile();
update = func.Invoke(update);
}
Task<dynamic> result = TwitterEngine.MakeRequest(update);
return result;
}
public static IObservable <TR> Bind <T, TR>(this T viewModel, System.Linq.Expressions.Expression <Func <T, TR> > outExpr, bool activate = false) where T : INotifyPropertyChanged
{
var expr = (System.Linq.Expressions.MemberExpression)outExpr.Body;
var prop = (System.Reflection.PropertyInfo)expr.Member;
var name = prop.Name;
var comp = outExpr.Compile();
var ret = Observable.FromEventPattern <PropertyChangedEventHandler, PropertyChangedEventArgs>(t => viewModel.PropertyChanged += t, t => viewModel.PropertyChanged -= t)
.Where(x => string.Equals(x.EventArgs.PropertyName, name))
.Select(x => comp(viewModel));
return(activate ? ret.StartWith(comp(viewModel)) : ret);
}
public void test_block_return_its_last_value()
{
// this test demostrates that only one of the blocks in the
// path to the root should reference each variable used in the
// child nodes. If one block below references the same variable
// then it's not the same variable.
ParameterExpression x = Expression.Parameter(typeof(int));
ParameterExpression y = Expression.Parameter(typeof(int));
BlockExpression expression = Expression.Block(new[] { x, y },
Expression.Block(
Expression.Assign(x, Expression.Constant(1)),
Expression.Block(Expression.Assign(y, x), y)));
Expression <Func <int> > lamda = Expression.Lambda <Func <int> >(expression);
int result = lamda.Compile()();
Assert.AreEqual(1, result);
}
private static Func <TIn, TOut> GetFunc()
{
ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
List <MemberBinding> memberBindingList = new List <MemberBinding>();
foreach (var item in typeof(TOut).GetProperties())
{
if (!item.CanWrite)
{
continue;
}
MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));
MemberBinding memberBinding = Expression.Bind(item, property);
memberBindingList.Add(memberBinding);
}
MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());
Expression <Func <TIn, TOut> > lambda = Expression.Lambda <Func <TIn, TOut> >(memberInitExpression, new ParameterExpression[] { parameterExpression });
return(lambda.Compile());
}