protected internal override Expression VisitAwait(AwaitCSharpExpression node)
{
var args = new List <object>();
if (node.GetAwaiterMethod != null)
{
args.Add(new XAttribute(nameof(AwaitCSharpExpression.GetAwaiterMethod), node.GetAwaiterMethod));
}
else
{
var dynamic = node as DynamicAwaitCSharpExpression;
if (dynamic != null)
{
args.Add(new XAttribute("IsDynamic", true));
if (dynamic.Context != null)
{
args.Add(new XAttribute(nameof(dynamic.Context), dynamic.Context));
}
}
}
args.Add(new XElement(nameof(node.Operand), Visit(node.Operand)));
return(Push(node, args));
}
protected internal override Expression VisitAwait(AwaitCSharpExpression node)
{
var args = new List <object>
{
new XElement(nameof(node.Info), Visit(node.Info)),
new XElement(nameof(node.Operand), Visit(node.Operand))
};
return(Push(node, args));
}
private static void ValidateAwaitPattern(Type operandType, ref MethodInfo getAwaiterMethod, out Type resultType)
{
if (getAwaiterMethod == null)
{
getAwaiterMethod = AwaitCSharpExpression.GetGetAwaiter(operandType);
}
//ContractUtils.RequiresNotNull(getAwaiterMethod, nameof(getAwaiterMethod));
ValidateGetAwaiterMethod(operandType, getAwaiterMethod);
ValidateAwaiterType(getAwaiterMethod.ReturnType, out resultType);
}
private static void ValidateAwaiterType(Type awaiterType, out Type resultType)
{
if (!typeof(INotifyCompletion).IsAssignableFrom(awaiterType))
{
throw Error.AwaiterTypeShouldImplementINotifyCompletion(awaiterType);
}
var isCompleted = awaiterType.GetProperty("IsCompleted", BindingFlags.Public | BindingFlags.Instance);
if (isCompleted == null || isCompleted.GetMethod == null)
{
throw Error.AwaiterTypeShouldHaveIsCompletedProperty(awaiterType);
}
if (isCompleted.PropertyType != typeof(bool))
{
throw Error.AwaiterIsCompletedShouldReturnBool(awaiterType);
}
if (isCompleted.GetIndexParameters().Length != 0)
{
throw Error.AwaiterIsCompletedShouldNotBeIndexer(awaiterType);
}
var getResult = AwaitCSharpExpression.GetGetResult(awaiterType);
if (getResult == null || getResult.IsGenericMethodDefinition)
{
throw Error.AwaiterTypeShouldHaveGetResultMethod(awaiterType);
}
var returnType = getResult.ReturnType;
if (returnType.IsByRef || returnType.IsPointer)
{
throw Error.AwaiterGetResultTypeInvalid(awaiterType);
}
resultType = returnType;
}
protected internal override Expression VisitAwait(AwaitCSharpExpression node)
{
return(node);
}
protected internal virtual Expression VisitAwait(AwaitCSharpExpression node) =>
node.Update(
Visit(node.Operand),
VisitAwaitInfo(node.Info)
);
public AwaitCSharpExpressionProxy(AwaitCSharpExpression node)
{
_node = node;
}
protected internal virtual Expression VisitAwait(AwaitCSharpExpression node)
{
return node.Update(Visit(node.Operand));
}
protected internal override Expression VisitAwait(AwaitCSharpExpression node)
{
Visited = true;
return base.VisitAwait(node);
}
public AwaitCSharpExpressionProxy(AwaitCSharpExpression node)
{
_node = node;
}
protected internal virtual Expression VisitAwait(AwaitCSharpExpression node)
{
return(node.Update(Visit(node.Operand)));
}
