通过TextBox控件在面板C＃迭代 [英] Iterating through textbox controls in a panel C#
问题描述
我见过很多人用类似的问题，但我不能在这里找到我的逻辑缺陷。任何帮助将大大AP preciated。
I have seen many others with similar problems but I cannot find the flaw in my logic here. Any help would be greatly appreciated.
我有我已经加入大量的标签和文本框控件到面板，即：
I have a Panel which I have added numerous label and textbox controls to, ie:
myPanel.Controls.Add(txtBox);
创建这些控件和添加的方法中调用previous的迭代法。
These controls are created and added in a method called previous to the iteration method.
我想通过每一个文本框迭代，并使用它的Text属性作为其他方法的参数，但我没有任何运气。这里是我的尝试迭代：
I want to iterate through each textbox and use its Text property as a parameter in another method but I am not having any luck. Here is my attempt to iterate:
public void updateQuestions()
{
try
{
foreach (Control c in editQuestionsPanel.Controls)
{
if (c is TextBox)
{
TextBox questionTextBox = (TextBox)c;
string question = questionTextBox.Text;
writeNewQuestionToTblQuestions(question);
}
}
}
catch (Exception err)
{
Console.WriteLine(err.Message);
}
}
我遇到的问题是控制并不是在面板里，当我在这个updateQuestions（）方法到达。这里涉及的过程：
The problem I am having is that the controls are not in the Panel when I arrive at this updateQuestions() method. Here is the process involved:
一个命令按钮被点击和问题是从数据库读取，对每个问题的方法被调用它增加了2标签和一个文本框editQuestionsPanel.Controls。该面板是一个占位符，然后可见里面。
A commandButton is clicked and the questions are read from a DB, for each question a method is called which adds 2 labels and a textbox to editQuestionsPanel.Controls. This panel is inside a PlaceHolder which is then made visible.
当点击占位符里面的按钮时，updateQuestions（）方法被调用和editQuestionsPanel.Controls.Count = 1。由于有大约在DB 12个问题应该是36左右的面板内的一个控制类型是：
When a button inside the PlaceHolder is clicked, the updateQuestions() method is called and the editQuestionsPanel.Controls.Count = 1. As there are approx 12 questions in the DB it should be around 36. The one control inside the Panel is of type:
System.Web.UI.LiteralControl
它不包含任何控制。
It contains no controls.
我相信somwhere在生命周期小组的控件都被清除，但我不知道如何分步直通的生命周期。我有一个Page_Load方法这是作为一个按钮被点击，一旦所谓的，但一旦它调用updateQuestions（）的按钮时，editQuestionsPanel.Controls.Count已经回到1，所以必须在此之前被清除，但我不知道如何纠正这种...
I am sure that somwhere in the lifecycle the Panel's controls are being cleared but I do not know how to step thru the life cycle. I have a Page_load method which is called as soon as a button is clicked but once the button which calls updateQuestions() is clicked the editQuestionsPanel.Controls.Count is already back to 1 so it must be cleared before this but I do not know how to correct this...
任何帮助，您可以给你帮我解决这将是极大的AP preciated - 其杀死我。
Any help you can give to help me solve this would be greatly appreciated - its killing me!
推荐答案
当您添加控件动态，你需要做的对的每个的要求 - asp.net不会为你做的！
When you add controls dynamically, you need to do that on every request - asp.net doesn't do that for you!
添加控件初始化或加载阶段，那么他们的将会的获得与回传值填充。
Add the controls in the Init or Load phase, then they will get populated with the postback values.
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