本文介绍了清除选定选项卡中所有文本框的文本的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个带有 tab 控件 的表单，每个选项卡都有许多 textboxes、labels 和 buttons.我想让用户清除所选标签的文本框中的所有文本.
I have a form that has a tab control and each tab has a number of textboxes,labels and buttons. I want to enable the user to clear all text in the textboxes of the selected tab.
我试过了
private void resetCurrentPageToolStripMenuItem_Click(object sender, EventArgs e)
{
foreach (TextBox t in tabControl1.SelectedTab.Controls)
{
t.Text = "";
}
}
上面的代码抛出一个 InvalidCastException 消息 Unable to cast object of type 'System.Windows.Forms.Button' to type 'System.Windows.Forms.TextBox.
The above code throw an InvalidCastException with the Message Unable to cast object of type 'System.Windows.Forms.Button' to type 'System.Windows.Forms.TextBox.
请问我做错了什么，我该如何纠正?
Pls what did i do wrong and how can i correct it?
推荐答案
在网上找到了这个，成功了
Found this online and it worked
void ClearTextBoxes(Control parent)
{
foreach (Control child in parent.Controls)
{
TextBox textBox = child as TextBox;
if (textBox == null)
ClearTextBoxes(child);
else
textBox.Text = string.Empty;
}
}
private void resetCurrentPageToolStripMenuItem_Click(object sender, EventArgs e)
{
ClearTextBoxes(tabControl1.SelectedTab);
}
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