在Click事件处理程序中，您将有一个参数"sender"-这是导致事件的TextBox:

In the Click event handler, you will have a parameter "sender" - this is the TextBox that caused the event:

TextBox t = sender as TextBox;
if (t != null)
   {
   Console.WriteLIne(t.Text);
   }

在TextBox
的Click事件处理程序中使用以下代码

Use the following code in the Click event handler of the TextBox

void t_Click(object sender, EventArgs e)
{
    TextBox t1 = (TextBox)sender;
    string str = t1.Text; 
}