Children.Add（项目）的价值并不在预期范围内 [英] Children.Add(item) value does not fall within the expected range

问题描述

我正在开发一个Silverlight 3应用程序，并得到这个非常奇怪的错误，当我尝试将对象添加到画布。我的code是如下：

I'm developing a Silverlight 3 app and getting this really weird error when I try to add an object to a Canvas. My code is as follows:

for (int i = 0; i < person.Children.Count; i++)
{
    //Add children in same position as parent
    Person child = person.Children[i];
    child.x_PositionTransform.X = person.x_PositionTransform.X;
    child.x_PositionTransform.Y = person.x_PositionTransform.Y;
    child.Click += new RoutedEventHandler(person_Click);
    x_LayoutRoot.Children.Add(child);
}

我第一次用这个，它工作正常。然而，当我点击使用这个code创建的Person对象后打x_LayoutRoot.Children.Add（孩子），我得到一个ArgumentException告诉我，值没有在预期范围之内。

The first time I use this, it works as expected. However, when I hit x_LayoutRoot.Children.Add(child) after clicking a Person object that was created using this code, I get an ArgumentException telling me that "Value does not fall within the expected range."

然而，当我将孩子x_LayoutRoot.Children前添加以下code，问题消失。

However, when I add the following code before adding child to x_LayoutRoot.Children, the problem disappears.

child.SetValue(Canvas.NameProperty, "child" + objCount++);

这是怎么回事？这是一个Silverlight的bug，或者（更有可能）我只是失去了一些东西？

Why is this happening? Is this a Silverlight bug, or (more likely) am I just missing something?

推荐答案

我想我已经想通了这个原因：我将用相同名称的多个Person对象。因此，如果任何人有这个问题，在未来，确保所有对象有唯一的名字！

I think I've figured out the cause of this: I was adding multiple Person objects with the same name. So, if anyone has this issue in the future, make sure all of your objects have unique names!

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