public OperationAwaiter(OperationBase control)
{
_operation = control;
}
public static OperationAwaiter GetAwaiter(this OperationBase operation)
{
return(new OperationAwaiter(operation));
}
private void RaiseLoadCompleted(OperationBase op)
{
if (op.HasError)
{
op.MarkErrorAsHandled();
}
AsyncCompletedEventHandler handler = this.LoadCompleted;
if (handler != null)
{
handler(this, new AsyncCompletedEventArgs(op.Error, op.IsCanceled, op.UserState));
}
}
private void OnInvokeCompleted(object sender, EventArgs e)
{
this.Operation = null;
InvokeOperation op = (InvokeOperation)sender;
if (!op.HasError && !op.IsCanceled)
{
this.Data = (IEnumerable)op.Value;
}
this.RaiseLoadCompleted(op);
}
private void OnLoadCompleted(LoadOperation op)
{
this.Operation = null;
if (!op.HasError && !op.IsCanceled)
{
this.Data = op.Entities;
}
this.RaiseLoadCompleted(op);
}
public void Refresh()
{
if ((this.DomainContext != null) & !string.IsNullOrEmpty(this.OperationName))
{
Type domainContextType = this.DomainContext.GetType();
MethodInfo operationInfo = domainContextType.GetMethods().Where(
m => (m.Name == this.OperationName) && (m.GetParameters().Count() == this.Parameters.Count)).FirstOrDefault();
if (operationInfo == null)
{
System.Diagnostics.Debug.WriteLine(
"Could not find a method named " + this.OperationName +
" with the specified parameters (" + string.Join(",", this.Parameters.Select(p => p.ParameterName)) + ").");
}
else
{
if (typeof(EntityQuery).IsAssignableFrom(operationInfo.ReturnType))
{
// Query
if (!DesignerProperties.IsInDesignTool)
{
EntityQuery query = (EntityQuery)operationInfo.Invoke(this.DomainContext, this.Parameters.Select(p => p.Value).ToArray());
this.Operation = this.DomainContext.Load(query, LoadBehavior.KeepCurrent, this.OnLoadCompleted, null);
}
}
else if (typeof(InvokeOperation).IsAssignableFrom(operationInfo.ReturnType))
{
// Invoke
if (!operationInfo.ReturnType.IsGenericType || !typeof(IEnumerable).IsAssignableFrom(operationInfo.ReturnType.GetGenericArguments()[0]))
{
throw new NotImplementedException("Support non-enumerable InvokeOperation return types is not implemented.");
}
if (!DesignerProperties.IsInDesignTool)
{
this.Operation = (InvokeOperation)operationInfo.Invoke(this.DomainContext, this.Parameters.Select(p => p.Value).ToArray());
this.Operation.Completed += this.OnInvokeCompleted;
}
}
else
{
throw new NotImplementedException("Support for return types other than EntityQuery and InvokeOperation is not implemented.");
}
}
}
}
