如何删除动态创建的按钮 [英] How to delete Dynamic created buttons..

问题描述

在预定义按钮的单击事件说显示动态btns"后，我知道如何向窗口添加动态按钮

I knw how to add dynamic buttons to window after a click event on predefined button say "show dynamic btns"

for(int i=0;i<4;i++)                     
{Button bz= new Button();
                         bz.Height = 50;
                         bz.Width = 50;
                         Grid gg=new Grid(); // dynamic grid that add bz
                         gg.Children.Add(bz);
                         ThumGrid.Children.Add(gg);//predefined Grid
}

这将创建4个动态网格和按钮.现在我想删除所有这些. bz和gg..pls告诉我我该怎么做?..

this will create 4 dynamic grid and buttons. now i want to remove all of them eg. bz and gg..pls tell me how can i do that?..

推荐答案

请注意，网格的子元素只是另一个集合. Add 和Remove 方法的工作原理与任何集合一样.有趣的是，Remove需要一个UIElement，因此如果您使用foreach遍历该集合，则会得到一个对象，该对象需要转换为UIElement才能删除. Clear 方法显然是最好的选择，但是您可以使用Remove 方法

Note that the children of the grid, is just another collection. The Add and Remove methods work just like any collection. Interesting thing is that the Remove needs a UIElement, so if you go through the collection with a foreach, you get an object, which needs to be converted to a UIElement in order to remove. The Clear method is obviously your best choise, but you can do a selective remove using the Remove method

进行选择性删除，几乎所有具有Add的事物，也具有Remove.要确保什么?请参阅:

http://msdn.microsoft.com/en-us/library/system. windows.controls.grid.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system.windows.controls.panel.children.aspx [ ^ ]，
http://msdn.microsoft.com/en-us/library/system. windows.controls.uielementcollection.aspx [ ^ ].

现在，您阅读文档的能力出了什么问题?也许您还需要一个链接:
Microsoft Q209354 .

—SA

Nearly everything that has Add, also has Remove. What to make sure? Please see:

http://msdn.microsoft.com/en-us/library/system.windows.controls.grid.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.controls.panel.children.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.controls.uielementcollection.aspx[^].

Now, what''s wrong with your ability to read the documentation? Perhaps you need one more link:
Microsoft Q209354.

—SA

您需要保留对Grid的引用，直到要删除它们为止. (Grid保留对Button s的引用.)

对于您的示例，在窗口类中创建一个私有字段:

You need to keep references to the Grids until you want to delete them. (The Grids keep the references to the Buttons.)

For your example, create a private field in the window class:

private List<Grid> DynamicGrids = new List<Grid>();

然后添加:

Then add:

DynamicGrids.Add(gg);

到创建Grid s和Button s的for循环.
然后，当您要删除它们时:

to the for loop that creates the Grids and Buttons.
Then when you want to remove them:

foreach (Grid g in DynamicGrids)
{
  ThumGrid.Children.Remove(g);
}

假设ThumGrid包含您不想删除的其他元素，否则就很简单:

This assumes that ThumGrid contains other elements that you don''t want to remove, otherwise it is simply:

ThumGrid.Children.Clear();

在使用IEnumerator(例如，foreach)遍历该集合时，请注意不要从ThumGrid.Children中删除元素，否则会抛出异常:System.InvalidOperationException.

Be careful not to Remove elements from ThumGrid.Children while iterating over that collection with an IEnumerator (e.g., foreach) or else you will throw an exception: System.InvalidOperationException.

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