动态创建多个文本框C＃

这是我的代码。 但我的所有文本框的值都是空的。

public void createTxtTeamNames() { TextBox[] txtTeamNames = new TextBox[teams]; int i = 0; foreach (TextBox txt in txtTeamNames) { string name = "TeamNumber" + i.ToString(); txt.Name = name; txt.Text = name; txt.Location = new Point(172, 32 + (i * 28)); txt.Visible = true; i++; } } 

谢谢您的帮助。

Answer 1

数组创建调用只是将元素初始化为null 。 您需要单独创建它们。

 TextBox[] txtTeamNames = new TextBox[teams]; for (int i = 0; i < txtTeamNames.Length; i++) { var txt = new TextBox(); txtTeamNames[i] = txt; txt.Name = name; txt.Text = name; txt.Location = new Point(172, 32 + (i * 28)); txt.Visible = true; } 

注意：正如一些人指出的那样，为了使这段代码有意义，你需要将每个TextBox添加到父Control

Answer 2

您需要在循环开始时初始化文本框。

您还需要使用for循环而不是foreach。

Answer 3

您需要新建TextBoxes：

 for (int i = 0; i < teams; i++) { txtTeamNames[i] = new TextBox(); ... } 

Answer 4

你做错了，你必须将文本框实例添加到数组，然后将其添加到表单。 这是你应该怎么做的。

 public void createTxtTeamNames() { TextBox[] txtTeamNames = new TextBox[10]; for (int u = 0; u < txtTeamNames.Count(); u++) { txtTeamNames[u] = new TextBox(); } int i = 0; foreach (TextBox txt in txtTeamNames) { string name = "TeamNumber" + i.ToString(); txt.Name = name; txt.Text = name; txt.Location = new Point(0, 32 + (i * 28)); txt.Visible = true; this.Controls.Add(txt); i++; } } 

Answer 5

  private void button2_Click(object sender, EventArgs e) { TextBox tb = new TextBox(); tb.Name = abc; tb.Text = "" + i; Point p = new Point(20 + i, 30 * i); tb.Location = p; this.Controls.Add(tb); i++; } private void button3_Click(object sender, EventArgs e) { foreach (TextBox item in this.Controls.OfType()) { MessageBox.Show(item.Name + ": " + item.Text + "\\n"); } }